From 54b5aef45236f424f6cda5b01f18cd803a565279 Mon Sep 17 00:00:00 2001
From: CentOS Sources <bugs@centos.org>
Date: Nov 14 2020 08:09:21 +0000
Subject: import kexec-tools-2.0.20-37.el8


---

diff --git a/SOURCES/dracut-early-kdump-module-setup.sh b/SOURCES/dracut-early-kdump-module-setup.sh
index f30bd67..3b23383 100755
--- a/SOURCES/dracut-early-kdump-module-setup.sh
+++ b/SOURCES/dracut-early-kdump-module-setup.sh
@@ -48,7 +48,10 @@ install() {
     inst_simple "/etc/sysconfig/kdump"
     inst_binary "/usr/sbin/kexec"
     inst_binary "/usr/bin/gawk" "/usr/bin/awk"
+    inst_binary "/usr/bin/logger" "/usr/bin/logger"
+    inst_binary "/usr/bin/printf" "/usr/bin/printf"
     inst_script "/lib/kdump/kdump-lib.sh" "/lib/kdump-lib.sh"
+    inst_script "/lib/kdump/kdump-logger.sh" "/lib/kdump-logger.sh"
     inst_hook cmdline 00 "$moddir/early-kdump.sh"
     inst_binary "$KDUMP_KERNEL"
     inst_binary "$KDUMP_INITRD"
diff --git a/SOURCES/dracut-early-kdump.sh b/SOURCES/dracut-early-kdump.sh
index 92913fb..a4e14a4 100755
--- a/SOURCES/dracut-early-kdump.sh
+++ b/SOURCES/dracut-early-kdump.sh
@@ -13,6 +13,13 @@ EARLY_KEXEC_ARGS=""
 . /lib/dracut-lib.sh
 . /lib/kdump-lib.sh
 
+#initiate the kdump logger
+dlog_init
+if [ $? -ne 0 ]; then
+        echo "failed to initiate the kdump logger."
+        exit 1
+fi
+
 prepare_parameters()
 {
     EARLY_KDUMP_CMDLINE=$(prepare_cmdline "${KDUMP_COMMANDLINE}" "${KDUMP_COMMANDLINE_REMOVE}" "${KDUMP_COMMANDLINE_APPEND}")
@@ -28,7 +35,7 @@ early_kdump_load()
     fi
 
     if is_fadump_capable; then
-        echo "WARNING: early kdump doesn't support fadump."
+        dwarn "WARNING: early kdump doesn't support fadump."
         return 1
     fi
 
@@ -42,18 +49,25 @@ early_kdump_load()
     EARLY_KEXEC_ARGS=$(prepare_kexec_args "${KEXEC_ARGS}")
 
     if is_secure_boot_enforced; then
-        echo "Secure Boot is enabled. Using kexec file based syscall."
+        dinfo "Secure Boot is enabled. Using kexec file based syscall."
         EARLY_KEXEC_ARGS="$EARLY_KEXEC_ARGS -s"
     fi
 
+    # Here, only output the messages, but do not save these messages
+    # to a file because the target disk may not be mounted yet, the
+    # earlykdump is too early.
+    ddebug "earlykdump: $KEXEC ${EARLY_KEXEC_ARGS} $standard_kexec_args \
+	--command-line=$EARLY_KDUMP_CMDLINE --initrd=$EARLY_KDUMP_INITRD \
+	$EARLY_KDUMP_KERNEL"
+
     $KEXEC ${EARLY_KEXEC_ARGS} $standard_kexec_args \
         --command-line="$EARLY_KDUMP_CMDLINE" \
         --initrd=$EARLY_KDUMP_INITRD $EARLY_KDUMP_KERNEL
     if [ $? == 0 ]; then
-        echo "kexec: loaded early-kdump kernel"
+        dinfo "kexec: loaded early-kdump kernel"
         return 0
     else
-        echo "kexec: failed to load early-kdump kernel"
+        derror "kexec: failed to load early-kdump kernel"
         return 1
     fi
 }
@@ -61,10 +75,10 @@ early_kdump_load()
 set_early_kdump()
 {
     if getargbool 0 rd.earlykdump; then
-        echo "early-kdump is enabled."
+        dinfo "early-kdump is enabled."
         early_kdump_load
     else
-        echo "early-kdump is disabled."
+        dinfo "early-kdump is disabled."
     fi
 
     return 0
diff --git a/SOURCES/dracut-kdump.sh b/SOURCES/dracut-kdump.sh
index 6f948fc..c2627c2 100755
--- a/SOURCES/dracut-kdump.sh
+++ b/SOURCES/dracut-kdump.sh
@@ -5,7 +5,6 @@ if [ -f /etc/fadump.initramfs ] && [ ! -f /proc/device-tree/rtas/ibm,kernel-dump
     exit 0
 fi
 
-exec &> /dev/console
 . /lib/dracut-lib.sh
 . /lib/kdump-lib-initramfs.sh
 
@@ -22,7 +21,7 @@ do_dump()
     _ret=$?
 
     if [ $_ret -ne 0 ]; then
-        echo "kdump: saving vmcore failed"
+        derror "saving vmcore failed"
     fi
 
     return $_ret
@@ -36,7 +35,7 @@ do_kdump_pre()
         "$KDUMP_PRE"
         _ret=$?
         if [ $_ret -ne 0 ]; then
-            echo "kdump: $KDUMP_PRE exited with $_ret status"
+            derror "$KDUMP_PRE exited with $_ret status"
             return $_ret
         fi
     fi
@@ -47,7 +46,7 @@ do_kdump_pre()
             "$file"
             _ret=$?
             if [ $_ret -ne 0 ]; then
-                echo "kdump: $file exited with $_ret status"
+                derror "$file exited with $_ret status"
             fi
         done
     fi
@@ -63,7 +62,7 @@ do_kdump_post()
             "$file" "$1"
             _ret=$?
             if [ $_ret -ne 0 ]; then
-                echo "kdump: $file exited with $_ret status"
+                derror "$file exited with $_ret status"
             fi
         done
     fi
@@ -72,7 +71,7 @@ do_kdump_post()
         "$KDUMP_POST" "$1"
         _ret=$?
         if [ $_ret -ne 0 ]; then
-            echo "kdump: $KDUMP_POST exited with $_ret status"
+            derror "$KDUMP_POST exited with $_ret status"
         fi
     fi
 }
@@ -88,7 +87,7 @@ dump_raw()
 
     [ -b "$_raw" ] || return 1
 
-    echo "kdump: saving to raw disk $_raw"
+    dinfo "saving to raw disk $_raw"
 
     if ! $(echo -n $CORE_COLLECTOR|grep -q makedumpfile); then
         _src_size=`ls -l /proc/vmcore | cut -d' ' -f5`
@@ -96,21 +95,22 @@ dump_raw()
         monitor_dd_progress $_src_size_mb &
     fi
 
-    echo "kdump: saving vmcore"
+    dinfo "saving vmcore"
     $CORE_COLLECTOR /proc/vmcore | dd of=$_raw bs=$DD_BLKSIZE >> /tmp/dd_progress_file 2>&1 || return 1
     sync
 
-    echo "kdump: saving vmcore complete"
+    dinfo "saving vmcore complete"
     return 0
 }
 
 dump_ssh()
 {
+    local ret
     local _opt="-i $1 -o BatchMode=yes -o StrictHostKeyChecking=yes"
     local _dir="$KDUMP_PATH/$HOST_IP-$DATEDIR"
     local _host=$2
 
-    echo "kdump: saving to $_host:$_dir"
+    dinfo "saving to $_host:$_dir"
 
     cat /var/lib/random-seed > /dev/urandom
     ssh -q $_opt $_host mkdir -p $_dir || return 1
@@ -118,17 +118,29 @@ dump_ssh()
     save_vmcore_dmesg_ssh ${DMESG_COLLECTOR} ${_dir} "${_opt}" $_host
     save_opalcore_ssh ${_dir} "${_opt}" $_host
 
-    echo "kdump: saving vmcore"
+    dinfo "saving vmcore"
 
     if [ "${CORE_COLLECTOR%%[[:blank:]]*}" = "scp" ]; then
-        scp -q $_opt /proc/vmcore "$_host:$_dir/vmcore-incomplete" || return 1
+        scp -q $_opt /proc/vmcore "$_host:$_dir/vmcore-incomplete"
+        ret=$?
+        save_log
+        scp -q $_opt $KDUMP_LOG_FILE "$_host:$_dir/"
+        if [ $ret -ne 0 ]; then
+            return 1
+        fi
         ssh $_opt $_host "mv $_dir/vmcore-incomplete $_dir/vmcore" || return 1
     else
-        $CORE_COLLECTOR /proc/vmcore | ssh $_opt $_host "dd bs=512 of=$_dir/vmcore-incomplete" || return 1
+        $CORE_COLLECTOR /proc/vmcore | ssh $_opt $_host "dd bs=512 of=$_dir/vmcore-incomplete"
+        ret=$?
+        save_log
+        scp -q $_opt $KDUMP_LOG_FILE "$_host:$_dir/"
+        if [ $ret -ne 0 ]; then
+            return 1
+        fi
         ssh $_opt $_host "mv $_dir/vmcore-incomplete $_dir/vmcore.flat" || return 1
     fi
 
-    echo "kdump: saving vmcore complete"
+    dinfo "saving vmcore complete"
     return 0
 }
 
@@ -137,6 +149,8 @@ save_opalcore_ssh() {
     local _opts="$2"
     local _location=$3
 
+    ddebug "_path=$_path _opts=$_opts _location=$_location"
+
     if [ ! -f $OPALCORE ]; then
         # Check if we are on an old kernel that uses a different path
         if [ -f /sys/firmware/opal/core ]; then
@@ -146,15 +160,15 @@ save_opalcore_ssh() {
         fi
     fi
 
-    echo "kdump: saving opalcore"
+    dinfo "saving opalcore:$OPALCORE to $_location:$_path"
     scp $_opts $OPALCORE $_location:$_path/opalcore-incomplete
     if [ $? -ne 0 ]; then
-        echo "kdump: saving opalcore failed"
+        derror "saving opalcore failed"
        return 1
     fi
 
     ssh $_opts $_location mv $_path/opalcore-incomplete $_path/opalcore
-    echo "kdump: saving opalcore complete"
+    dinfo "saving opalcore complete"
     return 0
 }
 
@@ -164,15 +178,15 @@ save_vmcore_dmesg_ssh() {
     local _opts="$3"
     local _location=$4
 
-    echo "kdump: saving vmcore-dmesg.txt"
+    dinfo "saving vmcore-dmesg.txt to $_location:$_path"
     $_dmesg_collector /proc/vmcore | ssh $_opts $_location "dd of=$_path/vmcore-dmesg-incomplete.txt"
     _exitcode=$?
 
     if [ $_exitcode -eq 0 ]; then
         ssh -q $_opts $_location mv $_path/vmcore-dmesg-incomplete.txt $_path/vmcore-dmesg.txt
-        echo "kdump: saving vmcore-dmesg.txt complete"
+        dinfo "saving vmcore-dmesg.txt complete"
     else
-        echo "kdump: saving vmcore-dmesg.txt failed"
+        derror "saving vmcore-dmesg.txt failed"
     fi
 }
 
@@ -182,12 +196,12 @@ get_host_ip()
     if is_nfs_dump_target || is_ssh_dump_target
     then
         kdumpnic=$(getarg kdumpnic=)
-        [ -z "$kdumpnic" ] && echo "kdump: failed to get kdumpnic!" && return 1
+        [ -z "$kdumpnic" ] && derror "failed to get kdumpnic!" && return 1
         _host=`ip addr show dev $kdumpnic|grep '[ ]*inet'`
-        [ $? -ne 0 ] && echo "kdump: wrong kdumpnic: $kdumpnic" && return 1
+        [ $? -ne 0 ] && derror "wrong kdumpnic: $kdumpnic" && return 1
         _host=`echo $_host | head -n 1 | cut -d' ' -f2`
         _host="${_host%%/*}"
-        [ -z "$_host" ] && echo "kdump: wrong kdumpnic: $kdumpnic" && return 1
+        [ -z "$_host" ] && derror "wrong kdumpnic: $kdumpnic" && return 1
         HOST_IP=$_host
     fi
     return 0
@@ -196,7 +210,7 @@ get_host_ip()
 read_kdump_conf()
 {
     if [ ! -f "$KDUMP_CONF" ]; then
-        echo "kdump: $KDUMP_CONF not found"
+        derror "$KDUMP_CONF not found"
         return
     fi
 
@@ -240,7 +254,7 @@ fence_kdump_notify
 
 get_host_ip
 if [ $? -ne 0 ]; then
-    echo "kdump: get_host_ip exited with non-zero status!"
+    derror "get_host_ip exited with non-zero status!"
     exit 1
 fi
 
@@ -250,7 +264,7 @@ fi
 
 do_kdump_pre
 if [ $? -ne 0 ]; then
-    echo "kdump: kdump_pre script exited with non-zero status!"
+    derror "kdump_pre script exited with non-zero status!"
     do_final_action
     # During systemd service to reboot the machine, stop this shell script running
     exit 1
@@ -261,7 +275,7 @@ DUMP_RETVAL=$?
 
 do_kdump_post $DUMP_RETVAL
 if [ $? -ne 0 ]; then
-    echo "kdump: kdump_post script exited with non-zero status!"
+    derror "kdump_post script exited with non-zero status!"
 fi
 
 if [ $DUMP_RETVAL -ne 0 ]; then
diff --git a/SOURCES/dracut-module-setup.sh b/SOURCES/dracut-module-setup.sh
index 5b3f126..1c38c96 100755
--- a/SOURCES/dracut-module-setup.sh
+++ b/SOURCES/dracut-module-setup.sh
@@ -813,8 +813,11 @@ install() {
     inst "/bin/head" "/bin/head"
     inst "/sbin/makedumpfile" "/sbin/makedumpfile"
     inst "/sbin/vmcore-dmesg" "/sbin/vmcore-dmesg"
+    inst "/usr/bin/printf" "/sbin/printf"
+    inst "/usr/bin/logger" "/sbin/logger"
     inst "/lib/kdump/kdump-lib.sh" "/lib/kdump-lib.sh"
     inst "/lib/kdump/kdump-lib-initramfs.sh" "/lib/kdump-lib-initramfs.sh"
+    inst "/lib/kdump/kdump-logger.sh" "/lib/kdump-logger.sh"
     inst "$moddir/kdump.sh" "/usr/bin/kdump.sh"
     inst "$moddir/kdump-capture.service" "$systemdsystemunitdir/kdump-capture.service"
     ln_r "$systemdsystemunitdir/kdump-capture.service" "$systemdsystemunitdir/initrd.target.wants/kdump-capture.service"
diff --git a/SOURCES/kdump-lib-initramfs.sh b/SOURCES/kdump-lib-initramfs.sh
index 3a80efb..1e62550 100755
--- a/SOURCES/kdump-lib-initramfs.sh
+++ b/SOURCES/kdump-lib-initramfs.sh
@@ -3,6 +3,7 @@
 . /lib/kdump-lib.sh
 
 KDUMP_PATH="/var/crash"
+KDUMP_LOG_FILE="/run/initramfs/kexec-dmesg.log"
 CORE_COLLECTOR=""
 DEFAULT_CORE_COLLECTOR="makedumpfile -l --message-level 7 -d 31"
 DMESG_COLLECTOR="/sbin/vmcore-dmesg"
@@ -20,6 +21,13 @@ KDUMP_POST=""
 NEWROOT="/sysroot"
 OPALCORE="/sys/firmware/opal/mpipl/core"
 
+#initiate the kdump logger
+dlog_init
+if [ $? -ne 0 ]; then
+    echo "failed to initiate the kdump logger."
+    exit 1
+fi
+
 get_kdump_confs()
 {
     local config_opt config_val
@@ -94,34 +102,47 @@ get_kdump_confs()
     fi
 }
 
+# store the kexec kernel log to a file.
+save_log()
+{
+    dmesg -T > $KDUMP_LOG_FILE
+
+    if command -v journalctl > /dev/null; then
+        journalctl -ab >> $KDUMP_LOG_FILE
+    fi
+}
+
 # dump_fs <mount point>
 dump_fs()
 {
+    local ret
     local _mp=$1
     local _dev=$(get_mount_info SOURCE target $_mp -f)
     local _op=$(get_mount_info OPTIONS target $_mp -f)
 
+    ddebug "_mp=$_mp _dev=$_dev _op=$_op"
+
     # If dump path have a corresponding device entry but not mounted, mount it.
     if [ -n "$_dev" ] || [ "$_dev" == "rootfs" ]; then
         if ! is_mounted "$_mp"; then
-            echo "kdump: dump target $_dev is not mounted, trying to mount..."
+            dinfo "dump target $_dev is not mounted, trying to mount..."
             mkdir -p $_mp
             mount -o $_op $_dev $_mp
 
             if [ $? -ne 0 ]; then
-                echo "kdump: mounting failed (mount point: $_mp, option: $_op)"
+                derror "mounting failed (mount point: $_mp, option: $_op)"
                 return 1
             fi
         fi
     else
-        echo "kdump: failed to dump to \"$_mp\", it's not a mount point!"
+        derror "failed to dump to \"$_mp\", it's not a mount point!"
         return 1
     fi
 
     # Remove -F in makedumpfile case. We don't want a flat format dump here.
     [[ $CORE_COLLECTOR = *makedumpfile* ]] && CORE_COLLECTOR=`echo $CORE_COLLECTOR | sed -e "s/-F//g"`
 
-    echo "kdump: saving to $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
+    dinfo "saving to $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
 
     mount -o remount,rw $_mp || return 1
     mkdir -p $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR || return 1
@@ -129,12 +150,18 @@ dump_fs()
     save_vmcore_dmesg_fs ${DMESG_COLLECTOR} "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
     save_opalcore_fs "$_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/"
 
-    echo "kdump: saving vmcore"
-    $CORE_COLLECTOR /proc/vmcore $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete || return 1
+    dinfo "saving vmcore"
+    $CORE_COLLECTOR /proc/vmcore $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete
+    ret=$?
+    save_log
+    mv $KDUMP_LOG_FILE $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/
+    if [ $ret -ne 0 ]; then
+        return 1
+    fi
     mv $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore-incomplete $_mp/$KDUMP_PATH/$HOST_IP-$DATEDIR/vmcore
     sync
 
-    echo "kdump: saving vmcore complete"
+    dinfo "saving vmcore complete"
 
     # improper kernel cmdline can cause the failure of echo, we can ignore this kind of failure
     return 0
@@ -144,7 +171,7 @@ save_vmcore_dmesg_fs() {
     local _dmesg_collector=$1
     local _path=$2
 
-    echo "kdump: saving vmcore-dmesg.txt"
+    dinfo "saving vmcore-dmesg.txt to ${_path}"
     $_dmesg_collector /proc/vmcore > ${_path}/vmcore-dmesg-incomplete.txt
     _exitcode=$?
     if [ $_exitcode -eq 0 ]; then
@@ -154,9 +181,9 @@ save_vmcore_dmesg_fs() {
         # saving vmcore failed and system rebooted without sync and there
         # was no vmcore-dmesg.txt available.
         sync
-        echo "kdump: saving vmcore-dmesg.txt complete"
+        dinfo "saving vmcore-dmesg.txt complete"
     else
-        echo "kdump: saving vmcore-dmesg.txt failed"
+        derror "saving vmcore-dmesg.txt failed"
     fi
 }
 
@@ -172,43 +199,47 @@ save_opalcore_fs() {
         fi
     fi
 
-    echo "kdump: saving opalcore"
+    dinfo "saving opalcore:$OPALCORE to ${_path}/opalcore"
     cp $OPALCORE ${_path}/opalcore
     if [ $? -ne 0 ]; then
-        echo "kdump: saving opalcore failed"
+        derror "saving opalcore failed"
         return 1
     fi
 
     sync
-    echo "kdump: saving opalcore complete"
+    dinfo "saving opalcore complete"
     return 0
 }
 
 dump_to_rootfs()
 {
 
-    echo "Kdump: trying to bring up rootfs device"
+    dinfo "Trying to bring up rootfs device"
     systemctl start dracut-initqueue
-    echo "Kdump: waiting for rootfs mount, will timeout after 90 seconds"
+    dinfo "Waiting for rootfs mount, will timeout after 90 seconds"
     systemctl start sysroot.mount
 
+    ddebug "NEWROOT=$NEWROOT"
+
     dump_fs $NEWROOT
 }
 
 kdump_emergency_shell()
 {
     echo "PS1=\"kdump:\\\${PWD}# \"" >/etc/profile
+    ddebug "Switching to dracut emergency..."
     /bin/dracut-emergency
     rm -f /etc/profile
 }
 
 do_failure_action()
 {
-    echo "Kdump: Executing failure action $FAILURE_ACTION"
+    dinfo "Executing failure action $FAILURE_ACTION"
     eval $FAILURE_ACTION
 }
 
 do_final_action()
 {
+    dinfo "Executing final action $FINAL_ACTION"
     eval $FINAL_ACTION
 }
diff --git a/SOURCES/kdump-lib.sh b/SOURCES/kdump-lib.sh
index f5a7012..2f08461 100755
--- a/SOURCES/kdump-lib.sh
+++ b/SOURCES/kdump-lib.sh
@@ -8,6 +8,12 @@ FENCE_KDUMP_CONFIG_FILE="/etc/sysconfig/fence_kdump"
 FENCE_KDUMP_SEND="/usr/libexec/fence_kdump_send"
 FADUMP_ENABLED_SYS_NODE="/sys/kernel/fadump_enabled"
 
+if [ -f /lib/kdump/kdump-logger.sh ]; then
+    . /lib/kdump/kdump-logger.sh
+elif [ -f /lib/kdump-logger.sh ]; then
+    . /lib/kdump-logger.sh
+fi
+
 is_fadump_capable()
 {
     # Check if firmware-assisted dump is enabled
@@ -20,14 +26,10 @@ is_fadump_capable()
 }
 
 perror_exit() {
-    echo $@ >&2
+    derror "$@"
     exit 1
 }
 
-perror() {
-    echo $@ >&2
-}
-
 is_ssh_dump_target()
 {
     grep -q "^ssh[[:blank:]].*@" /etc/kdump.conf
@@ -513,7 +515,7 @@ check_crash_mem_reserved()
 
     mem_reserved=$(cat /sys/kernel/kexec_crash_size)
     if [ $mem_reserved -eq 0 ]; then
-        echo "No memory reserved for crash kernel"
+        derror "No memory reserved for crash kernel"
         return 1
     fi
 
@@ -523,7 +525,7 @@ check_crash_mem_reserved()
 check_kdump_feasibility()
 {
     if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
-        echo "Kdump is not supported on this kernel"
+        derror "Kdump is not supported on this kernel"
         return 1
     fi
     check_crash_mem_reserved
@@ -533,7 +535,7 @@ check_kdump_feasibility()
 check_current_kdump_status()
 {
     if [ ! -f /sys/kernel/kexec_crash_loaded ];then
-        echo "Perhaps CONFIG_CRASH_DUMP is not enabled in kernel"
+        derror "Perhaps CONFIG_CRASH_DUMP is not enabled in kernel"
         return 1
     fi
 
@@ -661,8 +663,7 @@ prepare_kexec_args()
             found_elf_args=`echo $kexec_args | grep elf32-core-headers`
             if [ -n "$found_elf_args" ]
             then
-                echo -n "Warning: elf32-core-headers overrides correct elf64 setting"
-                echo
+                dwarn "Warning: elf32-core-headers overrides correct elf64 setting"
             else
                 kexec_args="$kexec_args --elf64-core-headers"
             fi
@@ -713,7 +714,7 @@ prepare_kdump_bootinfo()
     done
 
     if ! [ -e "$KDUMP_KERNEL" ]; then
-        echo "Failed to detect kdump kernel location"
+        derror "Failed to detect kdump kernel location"
         return 1
     fi
 
diff --git a/SOURCES/kdump-logger.sh b/SOURCES/kdump-logger.sh
new file mode 100755
index 0000000..370e5e8
--- /dev/null
+++ b/SOURCES/kdump-logger.sh
@@ -0,0 +1,348 @@
+#!/bin/bash
+#
+# This comes from the dracut-logger.sh
+#
+# The logger defined 4 logging levels:
+#   - ddebug (4)
+#     The DEBUG Level designates fine-grained informational events that are most
+#     useful to debug an application.
+#   - dinfo (3)
+#     The INFO level designates informational messages that highlight the
+#     progress of the application at coarse-grained level.
+#   - dwarn (2)
+#     The WARN level designates potentially harmful situations.
+#   - derror (1)
+#     The ERROR level designates error events that might still allow the
+#     application to continue running.
+#
+# Logging is controlled by following global variables:
+#   - @var kdump_stdloglvl - logging level to standard error (console output)
+#   - @var kdump_sysloglvl - logging level to syslog (by logger command)
+#   - @var kdump_kmsgloglvl - logging level to /dev/kmsg (only for boot-time)
+#
+# If any of the variables is not set, the function dlog_init() sets it to default:
+#   - In the first kernel:
+#     - @var kdump_stdloglvl = 3 (info)
+#     - @var kdump_sysloglvl = 0 (no logging)
+#     - @var kdump_kmsgloglvl = 0 (no logging)
+#
+#   -In the second kernel:
+#    - @var kdump_stdloglvl = 0 (no logging)
+#    - @var kdump_sysloglvl = 3 (info)
+#    - @var kdump_kmsgloglvl = 0 (no logging)
+#
+# First of all you have to start with dlog_init() function which initializes
+# required variables. Don't call any other logging function before that one!
+#
+
+# Define vairables for the log levels in this module.
+kdump_stdloglvl=""
+kdump_sysloglvl=""
+kdump_kmsgloglvl=""
+
+# The dracut-lib.sh is only available in the second kernel, and it won't
+# be used in the first kernel because the dracut-lib.sh is invisible in
+# the first kernel.
+if [ -f /lib/dracut-lib.sh ]; then
+    . /lib/dracut-lib.sh
+fi
+
+# @brief Get the log level from kernel command line.
+# @retval 1 if something has gone wrong
+# @retval 0 on success.
+#
+get_kdump_loglvl()
+{
+    (type -p getarg) && kdump_sysloglvl=$(getarg rd.kdumploglvl)
+    [ -z "$kdump_sysloglvl" ] && return 1;
+
+    (type -p isdigit) && isdigit $kdump_sysloglvl
+    [ $? -ne 0 ] && return 1;
+
+    return 0
+}
+
+# @brief Check the log level.
+# @retval 1 if something has gone wrong
+# @retval 0 on success.
+#
+check_loglvl()
+{
+    case "$1" in
+        0|1|2|3|4)
+            return 0
+           ;;
+        *)
+            return 1
+            ;;
+        esac
+}
+
+# @brief Initializes Logger.
+# @retval 1 if something has gone wrong
+# @retval 0 on success.
+#
+dlog_init() {
+    local ret=0; local errmsg
+
+    if [ -s /proc/vmcore ];then
+        get_kdump_loglvl
+        if [ $? -ne 0 ];then
+            logger -t "kdump[$$]" -p warn -- "Kdump is using the default log level(3)."
+            kdump_sysloglvl=3
+        fi
+        kdump_stdloglvl=0
+        kdump_kmsgloglvl=0
+    else
+        kdump_stdloglvl=$KDUMP_STDLOGLVL
+        kdump_sysloglvl=$KDUMP_SYSLOGLVL
+        kdump_kmsgloglvl=$KDUMP_KMSGLOGLVL
+    fi
+
+    [ -z "$kdump_stdloglvl" ] && kdump_stdloglvl=3
+    [ -z "$kdump_sysloglvl" ] && kdump_sysloglvl=0
+    [ -z "$kdump_kmsgloglvl" ] && kdump_kmsgloglvl=0
+
+    for loglvl in "$kdump_stdloglvl" "$kdump_kmsgloglvl" "$kdump_sysloglvl"; do
+        check_loglvl "$loglvl"
+        if [ $? -ne 0 ]; then
+            echo "Illegal log level: $kdump_stdloglvl $kdump_kmsgloglvl $kdump_sysloglvl"
+            return 1
+        fi
+    done
+
+    # Skip initialization if it's already done.
+    [ -n "$kdump_maxloglvl" ] && return 0
+
+    if [[ $UID -ne 0 ]]; then
+        kdump_kmsgloglvl=0
+        kdump_sysloglvl=0
+    fi
+
+    if [[ $kdump_sysloglvl -gt 0 ]]; then
+        if [[ -d /run/systemd/journal ]] \
+            && type -P systemd-cat &>/dev/null \
+            && systemctl --quiet is-active systemd-journald.socket &>/dev/null; then
+            readonly _systemdcatfile="/var/tmp/systemd-cat"
+            mkfifo "$_systemdcatfile" &>/dev/null
+            readonly _dlogfd=15
+            systemd-cat -t 'kdump' --level-prefix=true <"$_systemdcatfile" &
+            exec 15>"$_systemdcatfile"
+        elif ! [ -S /dev/log -a -w /dev/log ] || ! command -v logger >/dev/null; then
+            # We cannot log to syslog, so turn this facility off.
+            kdump_kmsgloglvl=$kdump_sysloglvl
+            kdump_sysloglvl=0
+            ret=1
+            errmsg="No '/dev/log' or 'logger' included for syslog logging"
+        fi
+    fi
+
+    local lvl; local maxloglvl_l=0
+    for lvl in $kdump_stdloglvl $kdump_sysloglvl $kdump_kmsgloglvl; do
+        [[ $lvl -gt $maxloglvl_l ]] && maxloglvl_l=$lvl
+    done
+    readonly kdump_maxloglvl=$maxloglvl_l
+    export kdump_maxloglvl
+
+    if [[ $kdump_stdloglvl -lt 4 ]] && [[ $kdump_kmsgloglvl -lt 4 ]] && [[ $kdump_sysloglvl -lt 4 ]]; then
+        unset ddebug
+        ddebug() { :; };
+    fi
+
+    if [[ $kdump_stdloglvl -lt 3 ]] && [[ $kdump_kmsgloglvl -lt 3 ]] && [[ $kdump_sysloglvl -lt 3 ]]; then
+        unset dinfo
+        dinfo() { :; };
+    fi
+
+    if [[ $kdump_stdloglvl -lt 2 ]] && [[ $kdump_kmsgloglvl -lt 2 ]] && [[ $kdump_sysloglvl -lt 2 ]]; then
+        unset dwarn
+        dwarn() { :; };
+        unset dwarning
+        dwarning() { :; };
+    fi
+
+    if [[ $kdump_stdloglvl -lt 1 ]] && [[ $kdump_kmsgloglvl -lt 1 ]] && [[ $kdump_sysloglvl -lt 1 ]]; then
+        unset derror
+        derror() { :; };
+    fi
+
+    [ -n "$errmsg" ] && derror "$errmsg"
+
+    return $ret
+}
+
+## @brief Converts numeric level to logger priority defined by POSIX.2.
+#
+# @param lvl Numeric logging level in range from 1 to 4.
+# @retval 1 if @a lvl is out of range.
+# @retval 0 if @a lvl is correct.
+# @result Echoes logger priority.
+_lvl2syspri() {
+    case "$1" in
+        1) echo error;;
+        2) echo warning;;
+        3) echo info;;
+        4) echo debug;;
+        *) return 1;;
+    esac
+}
+
+## @brief Converts logger numeric level to syslog log level
+#
+# @param lvl Numeric logging level in range from 1 to 4.
+# @retval 1 if @a lvl is out of range.
+# @retval 0 if @a lvl is correct.
+# @result Echoes kernel console numeric log level
+#
+# Conversion is done as follows:
+#
+# <tt>
+#   none     -> LOG_EMERG (0)
+#   none     -> LOG_ALERT (1)
+#   none     -> LOG_CRIT (2)
+#   ERROR(1) -> LOG_ERR (3)
+#   WARN(2)  -> LOG_WARNING (4)
+#   none     -> LOG_NOTICE (5)
+#   INFO(3)  -> LOG_INFO (6)
+#   DEBUG(4) -> LOG_DEBUG (7)
+# </tt>
+#
+# @see /usr/include/sys/syslog.h
+_dlvl2syslvl() {
+    local lvl
+
+    case "$1" in
+        1) lvl=3;;
+        2) lvl=4;;
+        3) lvl=6;;
+        4) lvl=7;;
+        *) return 1;;
+    esac
+
+    # The number is constructed by multiplying the facility by 8 and then
+    # adding the level.
+    # About The Syslog Protocol, please refer to the RFC5424 for more details.
+    echo $((24+$lvl))
+}
+
+## @brief Prints to stderr, to syslog and/or /dev/kmsg given message with
+#  given level (priority).
+#
+# @param lvl Numeric logging level.
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+#
+# @note This function is not supposed to be called manually. Please use
+# dinfo(), ddebug(), or others instead which wrap this one.
+#
+# This is core logging function which logs given message to standard error
+# and/or syslog (with POSIX shell command <tt>logger</tt>) and/or to /dev/kmsg.
+# The format is following:
+#
+# <tt>X: some message</tt>
+#
+# where @c X is the first letter of logging level. See module description for
+# details on that.
+#
+# Message to syslog is sent with tag @c kdump. Priorities are mapped as
+# following:
+#   - @c ERROR to @c error
+#   - @c WARN to @c warning
+#   - @c INFO to @c info
+#   - @c DEBUG to @c debug
+_do_dlog() {
+    local lvl="$1"; shift
+    local msg="$*"
+
+    [[ $lvl -le $kdump_stdloglvl ]] && printf -- 'kdump: %s\n' "$msg" >&2
+
+    if [[ $lvl -le $kdump_sysloglvl ]]; then
+        if [[ "$_dlogfd" ]]; then
+            printf -- "<%s>%s\n" "$(($(_dlvl2syslvl $lvl) & 7))" "$msg" >&$_dlogfd
+        else
+            logger -t "kdump[$$]" -p $(_lvl2syspri $lvl) -- "$msg"
+        fi
+    fi
+
+    [[ $lvl -le $kdump_kmsgloglvl ]] && \
+        echo "<$(_dlvl2syslvl $lvl)>kdump[$$] $msg" >/dev/kmsg
+}
+
+## @brief Internal helper function for _do_dlog()
+#
+# @param lvl Numeric logging level.
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+#
+# @note This function is not supposed to be called manually. Please use
+# dinfo(), ddebug(), or others instead which wrap this one.
+#
+# This function calls _do_dlog() either with parameter msg, or if
+# none is given, it will read standard input and will use every line as
+# a message.
+#
+# This enables:
+# dwarn "This is a warning"
+# echo "This is a warning" | dwarn
+dlog() {
+    [ -z "$kdump_maxloglvl" ] && return 0
+    [[ $1 -le $kdump_maxloglvl ]] || return 0
+
+    if [[ $# -gt 1 ]]; then
+        _do_dlog "$@"
+    else
+        while read line || [ -n "$line" ]; do
+            _do_dlog "$1" "$line"
+        done
+    fi
+}
+
+## @brief Logs message at DEBUG level (4)
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+ddebug() {
+    set +x
+    dlog 4 "$@"
+    [ -n "$debug" ] && set -x || :
+}
+
+## @brief Logs message at INFO level (3)
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+dinfo() {
+    set +x
+    dlog 3 "$@"
+    [ -n "$debug" ] && set -x || :
+}
+
+## @brief Logs message at WARN level (2)
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+dwarn() {
+    set +x
+    dlog 2 "$@"
+    [ -n "$debug" ] && set -x || :
+}
+
+## @brief It's an alias to dwarn() function.
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+dwarning() {
+    set +x
+    dwarn "$@"
+    [ -n "$debug" ] && set -x || :
+}
+
+## @brief Logs message at ERROR level (1)
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+derror() {
+    set +x
+    dlog 1 "$@"
+    [ -n "$debug" ] && set -x || :
+}
diff --git a/SOURCES/kdump.sysconfig b/SOURCES/kdump.sysconfig
index 7c5641a..ae802d2 100644
--- a/SOURCES/kdump.sysconfig
+++ b/SOURCES/kdump.sysconfig
@@ -35,3 +35,19 @@ KEXEC_ARGS=""
 
 #What is the image type used for kdump
 KDUMP_IMG="vmlinuz"
+
+# Logging is controlled by following variables in the first kernel:
+#   - @var KDUMP_STDLOGLVL - logging level to standard error (console output)
+#   - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command)
+#   - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time)
+#
+# In the second kernel, kdump will use the rd.kdumploglvl option to set the
+# log level in the above KDUMP_COMMANDLINE_APPEND.
+#   - @var rd.kdumploglvl - logging level to syslog (by logger command)
+#   - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND
+#
+# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4)
+#
+# KDUMP_STDLOGLVL=3
+# KDUMP_SYSLOGLVL=0
+# KDUMP_KMSGLOGLVL=0
diff --git a/SOURCES/kdump.sysconfig.aarch64 b/SOURCES/kdump.sysconfig.aarch64
index 0589de3..2ab2893 100644
--- a/SOURCES/kdump.sysconfig.aarch64
+++ b/SOURCES/kdump.sysconfig.aarch64
@@ -35,3 +35,19 @@ KEXEC_ARGS="-s"
 
 #What is the image type used for kdump
 KDUMP_IMG="vmlinuz"
+
+# Logging is controlled by following variables in the first kernel:
+#   - @var KDUMP_STDLOGLVL - logging level to standard error (console output)
+#   - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command)
+#   - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time)
+#
+# In the second kernel, kdump will use the rd.kdumploglvl option to set the
+# log level in the above KDUMP_COMMANDLINE_APPEND.
+#   - @var rd.kdumploglvl - logging level to syslog (by logger command)
+#   - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND
+#
+# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4)
+#
+# KDUMP_STDLOGLVL=3
+# KDUMP_SYSLOGLVL=0
+# KDUMP_KMSGLOGLVL=0
diff --git a/SOURCES/kdump.sysconfig.i386 b/SOURCES/kdump.sysconfig.i386
index 84f0df1..165d13a 100644
--- a/SOURCES/kdump.sysconfig.i386
+++ b/SOURCES/kdump.sysconfig.i386
@@ -38,3 +38,19 @@ KDUMP_IMG="vmlinuz"
 
 #What is the images extension.  Relocatable kernels don't have one
 KDUMP_IMG_EXT=""
+
+# Logging is controlled by following variables in the first kernel:
+#   - @var KDUMP_STDLOGLVL - logging level to standard error (console output)
+#   - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command)
+#   - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time)
+#
+# In the second kernel, kdump will use the rd.kdumploglvl option to set the
+# log level in the above KDUMP_COMMANDLINE_APPEND.
+#   - @var rd.kdumploglvl - logging level to syslog (by logger command)
+#   - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND
+#
+# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4)
+#
+# KDUMP_STDLOGLVL=3
+# KDUMP_SYSLOGLVL=0
+# KDUMP_KMSGLOGLVL=0
diff --git a/SOURCES/kdump.sysconfig.ppc64 b/SOURCES/kdump.sysconfig.ppc64
index 7ce41e3..00b40ff 100644
--- a/SOURCES/kdump.sysconfig.ppc64
+++ b/SOURCES/kdump.sysconfig.ppc64
@@ -40,3 +40,19 @@ KDUMP_IMG="vmlinuz"
 KDUMP_IMG_EXT=""
 
 #Specify the action after failure
+
+# Logging is controlled by following variables in the first kernel:
+#   - @var KDUMP_STDLOGLVL - logging level to standard error (console output)
+#   - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command)
+#   - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time)
+#
+# In the second kernel, kdump will use the rd.kdumploglvl option to set the
+# log level in the above KDUMP_COMMANDLINE_APPEND.
+#   - @var rd.kdumploglvl - logging level to syslog (by logger command)
+#   - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND
+#
+# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4)
+#
+# KDUMP_STDLOGLVL=3
+# KDUMP_SYSLOGLVL=0
+# KDUMP_KMSGLOGLVL=0
diff --git a/SOURCES/kdump.sysconfig.ppc64le b/SOURCES/kdump.sysconfig.ppc64le
index 7ce41e3..00b40ff 100644
--- a/SOURCES/kdump.sysconfig.ppc64le
+++ b/SOURCES/kdump.sysconfig.ppc64le
@@ -40,3 +40,19 @@ KDUMP_IMG="vmlinuz"
 KDUMP_IMG_EXT=""
 
 #Specify the action after failure
+
+# Logging is controlled by following variables in the first kernel:
+#   - @var KDUMP_STDLOGLVL - logging level to standard error (console output)
+#   - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command)
+#   - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time)
+#
+# In the second kernel, kdump will use the rd.kdumploglvl option to set the
+# log level in the above KDUMP_COMMANDLINE_APPEND.
+#   - @var rd.kdumploglvl - logging level to syslog (by logger command)
+#   - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND
+#
+# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4)
+#
+# KDUMP_STDLOGLVL=3
+# KDUMP_SYSLOGLVL=0
+# KDUMP_KMSGLOGLVL=0
diff --git a/SOURCES/kdump.sysconfig.s390x b/SOURCES/kdump.sysconfig.s390x
index c989897..3f75b76 100644
--- a/SOURCES/kdump.sysconfig.s390x
+++ b/SOURCES/kdump.sysconfig.s390x
@@ -41,3 +41,19 @@ KDUMP_IMG="vmlinuz"
 
 #What is the images extension.  Relocatable kernels don't have one
 KDUMP_IMG_EXT=""
+
+# Logging is controlled by following variables in the first kernel:
+#   - @var KDUMP_STDLOGLVL - logging level to standard error (console output)
+#   - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command)
+#   - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time)
+#
+# In the second kernel, kdump will use the rd.kdumploglvl option to set the
+# log level in the above KDUMP_COMMANDLINE_APPEND.
+#   - @var rd.kdumploglvl - logging level to syslog (by logger command)
+#   - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND
+#
+# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4)
+#
+# KDUMP_STDLOGLVL=3
+# KDUMP_SYSLOGLVL=0
+# KDUMP_KMSGLOGLVL=0
diff --git a/SOURCES/kdump.sysconfig.x86_64 b/SOURCES/kdump.sysconfig.x86_64
index ce4d30f..b136d0c 100644
--- a/SOURCES/kdump.sysconfig.x86_64
+++ b/SOURCES/kdump.sysconfig.x86_64
@@ -38,3 +38,19 @@ KDUMP_IMG="vmlinuz"
 
 #What is the images extension.  Relocatable kernels don't have one
 KDUMP_IMG_EXT=""
+
+# Logging is controlled by following variables in the first kernel:
+#   - @var KDUMP_STDLOGLVL - logging level to standard error (console output)
+#   - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command)
+#   - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time)
+#
+# In the second kernel, kdump will use the rd.kdumploglvl option to set the
+# log level in the above KDUMP_COMMANDLINE_APPEND.
+#   - @var rd.kdumploglvl - logging level to syslog (by logger command)
+#   - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND
+#
+# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4)
+#
+# KDUMP_STDLOGLVL=3
+# KDUMP_SYSLOGLVL=0
+# KDUMP_KMSGLOGLVL=0
diff --git a/SOURCES/kdumpctl b/SOURCES/kdumpctl
index b29e180..a7ef61b 100755
--- a/SOURCES/kdumpctl
+++ b/SOURCES/kdumpctl
@@ -6,6 +6,7 @@ KDUMP_KERNEL=""
 KDUMP_COMMANDLINE=""
 KEXEC_ARGS=""
 KDUMP_CONFIG_FILE="/etc/kdump.conf"
+KDUMP_LOG_PATH="/var/log"
 MKDUMPRD="/sbin/mkdumprd -f"
 DRACUT_MODULES_FILE="/usr/lib/dracut/modules.txt"
 SAVE_PATH=/var/crash
@@ -21,11 +22,7 @@ FADUMP_REGISTER_SYS_NODE="/sys/kernel/fadump_registered"
 DEFAULT_DUMP_MODE="kdump"
 image_time=0
 
-[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
-. $dracutbasedir/dracut-functions.sh
-. /lib/kdump/kdump-lib.sh
-
-standard_kexec_args="-p"
+standard_kexec_args="-d -p"
 
 # Some default values in case /etc/sysconfig/kdump doesn't include
 KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug"
@@ -34,13 +31,24 @@ if [ -f /etc/sysconfig/kdump ]; then
 	. /etc/sysconfig/kdump
 fi
 
+[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
+. $dracutbasedir/dracut-functions.sh
+. /lib/kdump/kdump-lib.sh
+
+#initiate the kdump logger
+dlog_init
+if [ $? -ne 0 ]; then
+	echo "failed to initiate the kdump logger."
+	exit 1
+fi
+
 single_instance_lock()
 {
 	local rc timeout=5
 
 	exec 9>/var/lock/kdump
 	if [ $? -ne 0 ]; then
-		echo "Create file lock failed"
+		derror "Create file lock failed"
 		exit 1
 	fi
 
@@ -48,7 +56,7 @@ single_instance_lock()
 	rc=$?
 
 	while [ $rc -ne 0 ]; do
-		echo "Another app is currently holding the kdump lock; waiting for it to exit..."
+		dinfo "Another app is currently holding the kdump lock; waiting for it to exit..."
 		flock -w $timeout 9
 		rc=$?
 	done
@@ -59,9 +67,10 @@ determine_dump_mode()
 	# Check if firmware-assisted dump is enabled
 	# if yes, set the dump mode as fadump
 	if is_fadump_capable; then
-		echo "Dump mode is fadump"
+		dinfo "Dump mode is fadump"
 		DEFAULT_DUMP_MODE="fadump"
 	fi
+	ddebug "DEFAULT_DUMP_MODE=$DEFAULT_DUMP_MODE"
 }
 
 save_core()
@@ -69,22 +78,25 @@ save_core()
 	coredir="/var/crash/`date +"%Y-%m-%d-%H:%M"`"
 
 	mkdir -p $coredir
+	ddebug "cp --sparse=always /proc/vmcore $coredir/vmcore-incomplete"
 	cp --sparse=always /proc/vmcore $coredir/vmcore-incomplete
 	if [ $? == 0 ]; then
 		mv $coredir/vmcore-incomplete $coredir/vmcore
-		echo "saved a vmcore to $coredir"
+		dinfo "saved a vmcore to $coredir"
 	else
-		echo "failed to save a vmcore to $coredir" >&2
+		derror "failed to save a vmcore to $coredir"
 	fi
 
 	# pass the dmesg to Abrt tool if exists, in order
 	# to collect the kernel oops message.
 	# https://fedorahosted.org/abrt/
 	if [ -x /usr/bin/dumpoops ]; then
+		ddebug "makedumpfile --dump-dmesg $coredir/vmcore $coredir/dmesg"
 		makedumpfile --dump-dmesg $coredir/vmcore $coredir/dmesg >/dev/null 2>&1
+		ddebug "dumpoops -d $coredir/dmesg"
 		dumpoops -d $coredir/dmesg >/dev/null 2>&1
 		if [ $? == 0 ]; then
-			echo "kernel oops has been collected by abrt tool"
+			dinfo "kernel oops has been collected by abrt tool"
 		fi
 	fi
 }
@@ -96,16 +108,18 @@ rebuild_fadump_initrd()
 	# this file tells the initrd is fadump enabled
 	touch /tmp/fadump.initramfs
 	target_initrd_tmp="$TARGET_INITRD.tmp"
+	ddebug "rebuild fadump initrd: $target_initrd_tmp $DEFAULT_INITRD_BAK $KDUMP_KERNELVER"
 	$MKDUMPRD $target_initrd_tmp --rebuild $DEFAULT_INITRD_BAK --kver $KDUMP_KERNELVER \
 		-i /tmp/fadump.initramfs /etc/fadump.initramfs
 	if [ $? != 0 ]; then
-		echo "mkdumprd: failed to rebuild initrd with fadump support" >&2
+		derror "mkdumprd: failed to rebuild initrd with fadump support"
 		rm -f /tmp/fadump.initramfs
 		return 1
 	fi
 	rm -f /tmp/fadump.initramfs
 
 	# updating fadump initrd
+	ddebug "updating fadump initrd: $target_initrd_tmp $TARGET_INITRD"
 	mv $target_initrd_tmp $TARGET_INITRD
 	sync
 
@@ -120,14 +134,15 @@ check_earlykdump_is_enabled()
 
 rebuild_kdump_initrd()
 {
+	ddebug "rebuild kdump initrd: $MKDUMPRD $TARGET_INITRD $KDUMP_KERNELVER"
 	$MKDUMPRD $TARGET_INITRD $KDUMP_KERNELVER
 	if [ $? != 0 ]; then
-		echo "mkdumprd: failed to make kdump initrd" >&2
+		derror "mkdumprd: failed to make kdump initrd"
 		return 1
 	fi
 
 	if check_earlykdump_is_enabled; then
-		echo "Tips: If early kdump is enabled, also require rebuilding the system initramfs to make the changes take effect for early kdump."
+		dwarn "Tips: If early kdump is enabled, also require rebuilding the system initramfs to make the changes take effect for early kdump."
 	fi
 
 	return 0
@@ -136,7 +151,7 @@ rebuild_kdump_initrd()
 rebuild_initrd()
 {
 	if [[ ! -w "$KDUMP_BOOTDIR" ]];then
-		echo "$KDUMP_BOOTDIR does not have write permission. Can not rebuild $TARGET_INITRD"
+		derror "$KDUMP_BOOTDIR does not have write permission. Can not rebuild $TARGET_INITRD"
 		return 1
 	fi
 
@@ -154,7 +169,7 @@ check_exist()
 {
 	for file in $1; do
 		if [ ! -e "$file" ]; then
-			echo -n "Error: $file not found."; echo
+			derror "Error: $file not found."
 			return 1
 		fi
 	done
@@ -165,7 +180,7 @@ check_executable()
 {
 	for file in $1; do
 		if [ ! -x "$file" ]; then
-			echo -n "Error: $file is not executable."; echo
+			derror "Error: $file is not executable."
 			return 1
 		fi
 	done
@@ -173,17 +188,19 @@ check_executable()
 
 backup_default_initrd()
 {
+	ddebug "backup default initrd: $DEFAULT_INITRD"
+
 	if [ ! -f "$DEFAULT_INITRD" ]; then
 		return
 	fi
 
 	if [ ! -e $DEFAULT_INITRD_BAK ]; then
-		echo "Backing up $DEFAULT_INITRD before rebuild."
+		dinfo "Backing up $DEFAULT_INITRD before rebuild."
 		# save checksum to verify before restoring
 		sha1sum $DEFAULT_INITRD > $INITRD_CHECKSUM_LOCATION
 		cp $DEFAULT_INITRD $DEFAULT_INITRD_BAK
 		if [ $? -ne 0 ]; then
-			echo "WARNING: failed to backup $DEFAULT_INITRD."
+			dwarn "WARNING: failed to backup $DEFAULT_INITRD."
 			rm -f $DEFAULT_INITRD_BAK
 		fi
 	fi
@@ -191,6 +208,8 @@ backup_default_initrd()
 
 restore_default_initrd()
 {
+	ddebug "restore default initrd: $DEFAULT_INITRD"
+
 	if [ ! -f "$DEFAULT_INITRD" ]; then
 		return
 	fi
@@ -202,13 +221,12 @@ restore_default_initrd()
 		backup_checksum=`sha1sum $DEFAULT_INITRD_BAK | awk '{ print $1 }'`
 		default_checksum=`cat $INITRD_CHECKSUM_LOCATION | awk '{ print $1 }'`
 		if [ "$default_checksum" != "$backup_checksum" ]; then
-			echo "WARNING: checksum mismatch! Can't restore original initrd.."
+			dwarn "WARNING: checksum mismatch! Can't restore original initrd.."
 		else
 			rm -f $INITRD_CHECKSUM_LOCATION
 			mv $DEFAULT_INITRD_BAK $DEFAULT_INITRD
 			if [[ $? -eq 0 ]]; then
-				echo -n "Restoring original initrd as fadump mode "
-				echo "is disabled."
+				derror "Restoring original initrd as fadump mode is disabled."
 				sync
 			fi
 		fi
@@ -220,7 +238,7 @@ check_config()
 	local -A _opt_rec
 	while read config_opt config_val; do
 		if [ -z "$config_val" ]; then
-			echo "Invalid kdump config value for option $config_opt"
+			derror "Invalid kdump config value for option $config_opt"
 			return 1
 		fi
 
@@ -228,7 +246,7 @@ check_config()
 		dracut_args)
 			if [[ $config_val == *--mount* ]]; then
 				if [ $(echo $config_val | grep -o "\-\-mount" | wc -l) -ne 1 ]; then
-					echo "Multiple mount targets specified in one \"dracut_args\"."
+					derror "Multiple mount targets specified in one \"dracut_args\"."
 					return 1
 				fi
 				config_opt=_target
@@ -236,7 +254,7 @@ check_config()
 			;;
 		raw)
 			if [ -d "/proc/device-tree/ibm,opal/dump" ]; then
-				echo "WARNING: Won't capture opalcore when 'raw' dump target is used."
+				derror "WARNING: Won't capture opalcore when 'raw' dump target is used."
 				return 1
 			fi
 			config_opt=_target
@@ -247,20 +265,20 @@ check_config()
 		sshkey|path|core_collector|kdump_post|kdump_pre|extra_bins|extra_modules|failure_action|default|final_action|force_rebuild|force_no_rebuild|fence_kdump_args|fence_kdump_nodes)
 			;;
 		net|options|link_delay|disk_timeout|debug_mem_level|blacklist)
-			echo "Deprecated kdump config option: $config_opt. Refer to kdump.conf manpage for alternatives."
+			derror "Deprecated kdump config option: $config_opt. Refer to kdump.conf manpage for alternatives."
 			return 1
 			;;
 		*)
-			echo "Invalid kdump config option $config_opt"
+			derror "Invalid kdump config option $config_opt"
 			return 1
 			;;
 		esac
 
 		if [ -n "${_opt_rec[$config_opt]}" ]; then
 			if [ $config_opt == _target ]; then
-				echo "More than one dump targets specified"
+				derror "More than one dump targets specified"
 			else
-				echo "Duplicated kdump config value of option $config_opt"
+				derror "Duplicated kdump config value of option $config_opt"
 			fi
 			return 1
 		fi
@@ -305,6 +323,7 @@ setup_initrd()
 {
 	prepare_kdump_bootinfo
 	if [ $? -ne 0 ]; then
+		derror "failed to prepare for kdump bootinfo."
 		return 1
 	fi
 
@@ -312,7 +331,7 @@ setup_initrd()
 	if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
 		TARGET_INITRD="$DEFAULT_INITRD"
 		if [ ! -s "$TARGET_INITRD" ]; then
-			echo "Error: No initrd found to rebuild!"
+			derror "Error: No initrd found to rebuild!"
 			return 1
 		fi
 
@@ -379,7 +398,7 @@ check_files_modified()
 			else
 				# If it's not a module nor builtin, give an error
 				if ! ( modprobe --set-version "$KDUMP_KERNELVER" --dry-run "$_module" &>/dev/null ); then
-					echo "Module $_module not found"
+					dwarn "Module $_module not found"
 				fi
 			fi
 		done
@@ -404,13 +423,12 @@ check_files_modified()
 				fi
 			fi
 		else
-			echo "$file doesn't exist"
+			dwarn "$file doesn't exist"
 		fi
 	done
 
 	if [ -n "$modified_files" ]; then
-		echo "Detected change(s) in the following file(s):"
-		echo -n "  "; echo "$modified_files" | sed 's/\s/\n  /g'
+		dinfo "Detected change(s) in the following file(s): $modified_files"
 		return 1
 	fi
 
@@ -448,13 +466,16 @@ check_dump_fs_modified()
 		_target=$(to_dev_name $_target)
 		_new_fstype=$(get_fs_type_from_target $_target)
 		if [[ -z "$_target" || -z "$_new_fstype" ]];then
-			echo "Dump path $_path does not exist"
+			derror "Dump path $_path does not exist"
 			return 2
 		fi
 	fi
 
+	ddebug "_target=$_target _path=$_path _new_fstype=$_new_fstype"
+
 	_record_block_drivers() {
 		local _drivers
+
 		if [[ -b /dev/block/$1 ]]; then
 			_drivers=$(udevadm info -a "/dev/block/$1" | sed -n 's/\s*DRIVERS=="\(\S\+\)"/\1/p')
 		fi
@@ -466,6 +487,7 @@ check_dump_fs_modified()
 				_target_drivers="$_target_drivers $_driver"
 			fi
 		done
+		ddebug "MAJ:MIN=$1 _drivers=$_drivers _target_drivers=$_targer_drivers"
 		return 1
 	}
 
@@ -478,7 +500,7 @@ check_dump_fs_modified()
 			continue
 		fi
 		if ! [[ " $_old_drivers " == *" $_module_name "* ]]; then
-			echo "Detected change in block device driver, new loaded module: $_module_name"
+			dinfo "Detected change in block device driver, new loaded module: $_module_name"
 			return 1
 		fi
 	done
@@ -488,7 +510,7 @@ check_dump_fs_modified()
 	else
 		_new_dev=$(kdump_get_persistent_dev $_target)
 		if [ -z "$_new_dev" ]; then
-			echo "Get persistent device name failed"
+			derror "Get persistent device name failed"
 			return 2
 		fi
 	fi
@@ -496,7 +518,7 @@ check_dump_fs_modified()
 	_new_mntpoint="$(get_kdump_mntpoint_from_target $_target)"
 	_dracut_args=$(lsinitrd $TARGET_INITRD -f usr/lib/dracut/build-parameter.txt)
 	if [[ -z "$_dracut_args" ]];then
-		echo "Warning: No dracut arguments found in initrd"
+		dwarn "Warning: No dracut arguments found in initrd"
 		return 0
 	fi
 
@@ -514,7 +536,7 @@ check_dump_fs_modified()
 		[[ "$_target" = "$(get_root_fs_device)" ]] && return 0
 	fi
 
-	echo "Detected change in File System"
+	dinfo "Detected change in File System"
 	return 1
 }
 
@@ -597,7 +619,7 @@ check_system_modified()
 
 	check_wdt_modified
 	if [ $? -ne 0 ]; then
-		echo "Detected change in watchdog state"
+		dinfo "Detected change in watchdog state"
 		return 1
 	fi
 
@@ -621,7 +643,7 @@ check_rebuild()
 	if [ $? -eq 0 ]; then
 		force_no_rebuild=`echo $_force_no_rebuild | cut -d' '  -f2`
 		if [ "$force_no_rebuild" != "0" ] && [ "$force_no_rebuild" != "1" ];then
-			echo "Error: force_no_rebuild value is invalid"
+			derror "Error: force_no_rebuild value is invalid"
 			return 1
 		fi
 	fi
@@ -630,13 +652,13 @@ check_rebuild()
 	if [ $? -eq 0 ]; then
 		force_rebuild=`echo $_force_rebuild | cut -d' '  -f2`
 		if [ "$force_rebuild" != "0" ] && [ "$force_rebuild" != "1" ];then
-			echo "Error: force_rebuild value is invalid"
+			derror "Error: force_rebuild value is invalid"
 			return 1
 		fi
 	fi
 
 	if [[ "$force_no_rebuild" == "1" && "$force_rebuild" == "1" ]]; then
-		echo "Error: force_rebuild and force_no_rebuild are enabled simultaneously in kdump.conf"
+		derror "Error: force_rebuild and force_no_rebuild are enabled simultaneously in kdump.conf"
 		return 1
 	fi
 
@@ -666,18 +688,18 @@ check_rebuild()
 	fi
 
 	if [ $image_time -eq 0 ]; then
-		echo  -n "No kdump initial ramdisk found."; echo
+		dinfo "No kdump initial ramdisk found."
 	elif [ "$capture_capable_initrd" == "0" ]; then
-		echo -n "Rebuild $TARGET_INITRD with dump capture support"; echo
+		dinfo "Rebuild $TARGET_INITRD with dump capture support"
 	elif [ "$force_rebuild" != "0" ]; then
-		echo -n "Force rebuild $TARGET_INITRD"; echo
+		dinfo "Force rebuild $TARGET_INITRD"
 	elif [ "$system_modified" != "0" ]; then
 		:
 	else
 		return 0
 	fi
 
-	echo "Rebuilding $TARGET_INITRD"
+	dinfo "Rebuilding $TARGET_INITRD"
 	rebuild_initrd
 	return $?
 }
@@ -687,6 +709,8 @@ check_rebuild()
 # as the currently running kernel.
 load_kdump()
 {
+	local ret
+
 	KEXEC_ARGS=$(prepare_kexec_args "${KEXEC_ARGS}")
 	KDUMP_COMMANDLINE=$(prepare_cmdline "${KDUMP_COMMANDLINE}" "${KDUMP_COMMANDLINE_REMOVE}" "${KDUMP_COMMANDLINE_APPEND}")
 
@@ -694,18 +718,34 @@ load_kdump()
 	# Old syscall will always fail as it does not have capability to
 	# to kernel signature verification.
 	if is_secure_boot_enforced; then
-		echo "Secure Boot is enabled. Using kexec file based syscall."
+		dinfo "Secure Boot is enabled. Using kexec file based syscall."
 		KEXEC_ARGS="$KEXEC_ARGS -s"
 	fi
 
+	ddebug "$KEXEC $KEXEC_ARGS $standard_kexec_args --command-line=$KDUMP_COMMANDLINE --initrd=$TARGET_INITRD $KDUMP_KERNEL"
+
+	# The '12' represents an intermediate temporary file descriptor
+	# to store the standard error file descriptor '2', and later
+	# restore the error file descriptor with the file descriptor '12'
+	# and release it.
+	exec 12>&2
+	exec 2>> $KDUMP_LOG_PATH/kdump.log
+	PS4='+ $(date "+%Y-%m-%d %H:%M:%S") ${BASH_SOURCE}@${LINENO}: '
+	set -x
+
 	$KEXEC $KEXEC_ARGS $standard_kexec_args \
 		--command-line="$KDUMP_COMMANDLINE" \
 		--initrd=$TARGET_INITRD $KDUMP_KERNEL
-	if [ $? == 0 ]; then
-		echo "kexec: loaded kdump kernel"
+
+	ret=$?
+	set +x
+	exec 2>&12 12>&-
+
+	if [ $ret == 0 ]; then
+		dinfo "kexec: loaded kdump kernel"
 		return 0
 	else
-		echo "kexec: failed to load kdump kernel" >&2
+		derror "kexec: failed to load kdump kernel"
 		return 1
 	fi
 }
@@ -720,7 +760,7 @@ check_ssh_config()
 				# canonicalize the path
 				SSH_KEY_LOCATION=$(/usr/bin/readlink -m $config_val)
 			else
-				echo "WARNING: '$config_val' doesn't exist, using default value '$SSH_KEY_LOCATION'"
+				dwarn "WARNING: '$config_val' doesn't exist, using default value '$SSH_KEY_LOCATION'"
 			fi
 			;;
 		path)
@@ -762,22 +802,22 @@ check_and_wait_network_ready()
 		if [ $retval -eq 0 ]; then
 			return 0
 		elif [ $retval -ne 255 ]; then
-			echo "Could not create $DUMP_TARGET:$SAVE_PATH, you should check the privilege on server side"  >&2
+			derror "Could not create $DUMP_TARGET:$SAVE_PATH, you should check the privilege on server side"
 			return 1
 		fi
 
 		# if server removes the authorized_keys or, no /root/.ssh/kdump_id_rsa
-		echo $errmsg | grep -q "Permission denied\|No such file or directory\|Host key verification failed"
+		ddebug "$errmsg"
+		echo $errmsg | grep -q "Permission denied\|No such file or directory\|Host key verification failed" &> /dev/null
 		if [ $? -eq 0 ]; then
-			echo "Could not create $DUMP_TARGET:$SAVE_PATH, you probably need to run \"kdumpctl propagate\""  >&2
+			derror "Could not create $DUMP_TARGET:$SAVE_PATH, you probably need to run \"kdumpctl propagate\""
 			return 1
 		fi
 
 		if [ $warn_once -eq 1 ]; then
-			echo "Network dump target is not usable, waiting for it to be ready"
+			dwarn "Network dump target is not usable, waiting for it to be ready..."
 			warn_once=0
 		fi
-		echo -n .
 
 		cur=$(date +%s)
 		let "diff = $cur - $start_time"
@@ -788,7 +828,7 @@ check_and_wait_network_ready()
 		sleep 1
 	done
 
-	echo "Could not create $DUMP_TARGET:$SAVE_PATH, ipaddr is not ready yet. You should check network connection"  >&2
+	dinfo "Could not create $DUMP_TARGET:$SAVE_PATH, ipaddr is not ready yet. You should check network connection"
 	return 1
 }
 
@@ -805,7 +845,7 @@ propagate_ssh_key()
 {
 	check_ssh_config
 	if [ $? -ne 0 ]; then
-		echo "No ssh config specified in $KDUMP_CONFIG_FILE.  Can't propagate" >&2
+		derror "No ssh config specified in $KDUMP_CONFIG_FILE.  Can't propagate"
 		exit 1
 	fi
 
@@ -814,11 +854,11 @@ propagate_ssh_key()
 
 	#Check to see if we already created key, if not, create it.
 	if [ -f $KEYFILE ]; then
-		echo "Using existing keys..."
+		dinfo "Using existing keys..."
 	else
-		echo -n "Generating new ssh keys... "
+		dinfo "Generating new ssh keys... "
 		/usr/bin/ssh-keygen -t rsa -f $KEYFILE -N "" 2>&1 > /dev/null
-		echo "done."
+		dinfo "done."
 	fi
 
 	#now find the target ssh user and server to contact.
@@ -829,10 +869,10 @@ propagate_ssh_key()
 	ssh-copy-id -i $KEYFILE $SSH_USER@$SSH_SERVER
 	RET=$?
 	if [ $RET == 0 ]; then
-		echo $KEYFILE has been added to ~$SSH_USER/.ssh/authorized_keys on $SSH_SERVER
+		dinfo "$KEYFILE has been added to ~$SSH_USER/.ssh/authorized_keys on $SSH_SERVER"
 		return 0
 	else
-		echo $errmsg, $KEYFILE failed in transfer to $SSH_SERVER  >&2
+		derror "$errmsg, $KEYFILE failed in transfer to $SSH_SERVER"
 		exit 1
 	fi
 }
@@ -842,7 +882,7 @@ show_reserved_mem()
     local mem=$(cat /sys/kernel/kexec_crash_size)
     local mem_mb=$(expr $mem / 1024 / 1024)
 
-    echo "Reserved "$mem_mb"MB memory for crash kernel"
+    dinfo "Reserved "$mem_mb"MB memory for crash kernel"
 }
 
 check_current_fadump_status()
@@ -872,7 +912,7 @@ save_raw()
 	raw_target=$(awk '$1 ~ /^raw$/ { print $2; }' $KDUMP_CONFIG_FILE)
 	[ -z "$raw_target" ] && return 0
 	[ -b "$raw_target" ] || {
-		echo "raw partition $raw_target not found"
+		derror "raw partition $raw_target not found"
 		return 1
 	}
 	kdump_dir=`grep ^path $KDUMP_CONFIG_FILE | cut -d' '  -f2-`
@@ -884,12 +924,12 @@ save_raw()
 
 	mkdir -p "$coredir"
 	[ -d "$coredir" ] || {
-		echo "failed to create $coredir"
+		derror "failed to create $coredir"
 		return 1
 	}
 	if makedumpfile -R $coredir/vmcore <$raw_target >/dev/null 2>&1; then
 		# dump found
-		echo "Dump saved to $coredir/vmcore"
+		dinfo "Dump saved to $coredir/vmcore"
 		# wipe makedumpfile header
 		dd if=/dev/zero of=$raw_target bs=1b count=1 2>/dev/null
 	else
@@ -962,13 +1002,13 @@ check_fence_kdump_config()
 
 	for node in $nodes; do
 		if [ "$node" = "$hostname" ]; then
-			echo "Option fence_kdump_nodes cannot contain $hostname"
+			derror "Option fence_kdump_nodes cannot contain $hostname"
 			return 1
 		fi
 		# node can be ipaddr
 		echo $ipaddrs | grep $node > /dev/null
 		if [ $? -eq 0 ]; then
-			echo "Option fence_kdump_nodes cannot contain $node"
+			derror "Option fence_kdump_nodes cannot contain $node"
 			return 1
 		fi
 	done
@@ -990,11 +1030,11 @@ start_fadump()
 {
 	echo 1 > $FADUMP_REGISTER_SYS_NODE
 	if ! check_current_fadump_status; then
-		echo "fadump: failed to register"
+		derror "fadump: failed to register"
 		return 1
 	fi
 
-	echo "fadump: registered successfully"
+	dinfo "fadump: registered successfully"
 	return 0
 }
 
@@ -1021,7 +1061,7 @@ check_failure_action_config()
 	if [ -z "$failure_action" -a -z "$default_option" ]; then
 		return 0
 	elif [ -n "$failure_action" -a -n "$default_option" ]; then
-		echo "Cannot specify 'failure_action' and 'default' option together"
+		derror "Cannot specify 'failure_action' and 'default' option together"
 		return 1
 	fi
 
@@ -1035,7 +1075,7 @@ check_failure_action_config()
 		return 0
 	  ;;
 	  *)
-		echo $"Usage kdump.conf: $option {reboot|halt|poweroff|shell|dump_to_rootfs}"
+		dinfo $"Usage kdump.conf: $option {reboot|halt|poweroff|shell|dump_to_rootfs}"
 		return 1
 	esac
 }
@@ -1053,7 +1093,7 @@ check_final_action_config()
 			return 0
 		  ;;
 		  *)
-			echo $"Usage kdump.conf: final_action {reboot|halt|poweroff}"
+			dinfo $"Usage kdump.conf: final_action {reboot|halt|poweroff}"
 			return 1
 		esac
 	fi
@@ -1063,13 +1103,13 @@ start()
 {
 	check_dump_feasibility
 	if [ $? -ne 0 ]; then
-		echo "Starting kdump: [FAILED]"
+		derror "Starting kdump: [FAILED]"
 		return 1
 	fi
 
 	check_config
 	if [ $? -ne 0 ]; then
-		echo "Starting kdump: [FAILED]"
+		derror "Starting kdump: [FAILED]"
 		return 1
 	fi
 
@@ -1079,43 +1119,43 @@ start()
 
 	save_raw
 	if [ $? -ne 0 ]; then
-		echo "Starting kdump: [FAILED]"
+		derror "Starting kdump: [FAILED]"
 		return 1
 	fi
 
 	check_current_status
 	if [ $? == 0 ]; then
-		echo "Kdump already running: [WARNING]"
+		dwarn "Kdump already running: [WARNING]"
 		return 0
 	fi
 
 	if check_ssh_config; then
 		if ! check_ssh_target; then
-			echo "Starting kdump: [FAILED]"
+			derror "Starting kdump: [FAILED]"
 			return 1
 		fi
 	fi
 
 	check_rebuild
 	if [ $? != 0 ]; then
-		echo "Starting kdump: [FAILED]"
+		derror "Starting kdump: [FAILED]"
 		return 1
 	fi
 
 	start_dump
 	if [ $? != 0 ]; then
-		echo "Starting kdump: [FAILED]"
+		derror "Starting kdump: [FAILED]"
 		return 1
 	fi
 
-	echo "Starting kdump: [OK]"
+	dinfo "Starting kdump: [OK]"
 }
 
 reload()
 {
 	check_current_status
 	if [ $? -ne 0 ]; then
-		echo "Kdump was not running: [WARNING]"
+		dwarn "Kdump was not running: [WARNING]"
 	fi
 
 	if [ $DEFAULT_DUMP_MODE == "fadump" ]; then
@@ -1126,36 +1166,36 @@ reload()
 	fi
 
 	if [ $? -ne 0 ]; then
-		echo "Stopping kdump: [FAILED]"
+		derror "Stopping kdump: [FAILED]"
 		return 1
 	fi
 
-	echo "Stopping kdump: [OK]"
+	dinfo "Stopping kdump: [OK]"
 
 	setup_initrd
 	if [ $? -ne 0 ]; then
-		echo "Starting kdump: [FAILED]"
+		derror "Starting kdump: [FAILED]"
 		return 1
 	fi
 
 	start_dump
 	if [ $? -ne 0 ]; then
-		echo "Starting kdump: [FAILED]"
+		derror "Starting kdump: [FAILED]"
 		return 1
 	fi
 
-	echo "Starting kdump: [OK]"
+	dinfo "Starting kdump: [OK]"
 }
 
 stop_fadump()
 {
 	echo 0 > $FADUMP_REGISTER_SYS_NODE
 	if check_current_fadump_status; then
-		echo "fadump: failed to unregister"
+		derror "fadump: failed to unregister"
 		return 1
 	fi
 
-	echo "fadump: unregistered successfully"
+	dinfo "fadump: unregistered successfully"
 	return 0
 }
 
@@ -1168,11 +1208,11 @@ stop_kdump()
 	fi
 
 	if [ $? != 0 ]; then
-		echo "kexec: failed to unload kdump kernel"
+		derror "kexec: failed to unload kdump kernel"
 		return 1
 	fi
 
-	echo "kexec: unloaded kdump kernel"
+	dinfo "kexec: unloaded kdump kernel"
 	return 0
 }
 
@@ -1180,7 +1220,7 @@ reload_fadump()
 {
 	echo 1 > $FADUMP_REGISTER_SYS_NODE
 	if [ $? == 0 ]; then
-		echo "fadump: re-registered successfully"
+		dinfo "fadump: re-registered successfully"
 		return 0
 	else
 		# FADump could fail on older kernel where re-register
@@ -1205,11 +1245,11 @@ stop()
 	fi
 
 	if [ $? != 0 ]; then
-		echo "Stopping kdump: [FAILED]"
+		derror "Stopping kdump: [FAILED]"
 		return 1
 	fi
 
-	echo "Stopping kdump: [OK]"
+	dinfo "Stopping kdump: [OK]"
 	return 0
 }
 
@@ -1230,13 +1270,13 @@ rebuild() {
 		return 1
 	fi
 
-	echo "Rebuilding $TARGET_INITRD"
+	dinfo "Rebuilding $TARGET_INITRD"
 	rebuild_initrd
 	return $?
 }
 
 if [ ! -f "$KDUMP_CONFIG_FILE" ]; then
-	echo "Error: No kdump config file found!"  >&2
+	derror "Error: No kdump config file found!"
 	exit 1
 fi
 
@@ -1262,11 +1302,11 @@ main ()
 		check_current_status
 		case "$?" in
 		  0)
-			echo "Kdump is operational"
+			dinfo "Kdump is operational"
 			EXIT_CODE=0
 			;;
 		  1)
-			echo "Kdump is not operational"
+			dinfo "Kdump is not operational"
 			EXIT_CODE=3
 			;;
 		esac
@@ -1291,7 +1331,7 @@ main ()
 		show_reserved_mem
 		;;
 	  *)
-		echo $"Usage: $0 {start|stop|status|restart|reload|rebuild|propagate|showmem}"
+		dinfo $"Usage: $0 {start|stop|status|restart|reload|rebuild|propagate|showmem}"
 		exit 1
 	esac
 }
diff --git a/SOURCES/kexec-kdump-howto.txt b/SOURCES/kexec-kdump-howto.txt
index 23021d8..c3cb0cd 100644
--- a/SOURCES/kexec-kdump-howto.txt
+++ b/SOURCES/kexec-kdump-howto.txt
@@ -885,3 +885,83 @@ Debugging Tips
   minicom -C /tmp/console-logs
 
   Now minicom should be logging serial console in file console-logs.
+
+- Using the logger to output kdump log messages
+
+  You can configure the kdump log level for the first kernel in the
+  /etc/sysconfig/kdump. For example:
+
+  KDUMP_STDLOGLVL=3
+  KDUMP_SYSLOGLVL=0
+  KDUMP_KMSGLOGLVL=0
+
+  The above configurations indicate that kdump messages will be printed
+  to the console, and the KDUMP_STDLOGLVL is set to 3(info), but the
+  KDUMP_SYSLOGLVL and KDUMP_KMSGLOGLVL are set to 0(no logging). This
+  is also the current default log levels in the first kernel.
+
+  In the second kernel, you can add the 'rd.kdumploglvl=X' option to the
+  KDUMP_COMMANDLINE_APPEND in the /etc/sysconfig/kdump so that you can also
+  set the log levels for the second kernel. The 'X' represents the logging
+  levels, the default log level is 3(info) in the second kernel, for example:
+
+  # cat /etc/sysconfig/kdump |grep rd.kdumploglvl
+  KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices cgroup_disable=memory mce=off numa=off udev.children-max=2 panic=10 acpi_no_memhotplug transparent_hugepage=never nokaslr hest_disable novmcoredd rd.kdumploglvl=3"
+
+  Logging levels: no logging(0), error(1),warn(2),info(3),debug(4)
+
+  The ERROR level designates error events that might still allow the application
+  to continue running.
+
+  The WARN level designates potentially harmful situations.
+
+  The INFO level designates informational messages that highlight the progress
+  of the application at coarse-grained level.
+
+  The DEBUG level designates fine-grained informational events that are most
+  useful to debug an application.
+
+  Note: if you set the log level to 0, that will disable the logs at the
+  corresponding log level, which indicates that it has no log output.
+
+  At present, the logger works in both the first kernel(kdump service debugging)
+  and the second kernel.
+
+  In the first kernel, you can find the historical logs with the journalctl
+  command and check kdump service debugging information. In addition, the
+  'kexec -d' debugging messages are also saved to /var/log/kdump.log in the
+  first kernel. For example:
+
+  [root@ibm-z-109 ~]# ls -al /var/log/kdump.log
+  -rw-r--r--. 1 root root 63238 Oct 28 06:40 /var/log/kdump.log
+
+  If you want to get the debugging information of building kdump initramfs, you
+  can enable the '--debug' option for the dracut_args in the /etc/kdump.conf, and
+  then rebuild the kdump initramfs as below:
+
+  # systemctl restart kdump.service
+
+  That will rebuild the kdump initramfs and gerenate some logs to journald, you
+  can find the dracut logs with the journalctl command.
+
+  In the second kernel, kdump will automatically put the kexec-dmesg.log to a same
+  directory with the vmcore, the log file includes the debugging messages like dmesg
+  and journald logs. For example:
+
+  [root@ibm-z-109 ~]# ls -al /var/crash/127.0.0.1-2020-10-28-02\:01\:23/
+  drwxr-xr-x. 2 root root       67 Oct 28 02:02 .
+  drwxr-xr-x. 6 root root      154 Oct 28 02:01 ..
+  -rw-r--r--. 1 root root    21164 Oct 28 02:01 kexec-dmesg.log
+  -rw-------. 1 root root 74238698 Oct 28 02:01 vmcore
+  -rw-r--r--. 1 root root    17532 Oct 28 02:01 vmcore-dmesg.txt
+
+  If you want to get more debugging information in the second kernel, you can add
+  the 'rd.debug' option to the KDUMP_COMMANDLINE_APPEND in the /etc/sysconfig/kdump,
+  and then reload them in order to make the changes take effect.
+
+  In addition, you can also add the 'rd.memdebug=X' option to the KDUMP_COMMANDLINE_APPEND
+  in the /etc/sysconfig/kdump in order to output the additional information about
+  kernel module memory consumption during loading.
+
+  For more details, please refer to the /etc/sysconfig/kdump, or the man page of
+  dracut.cmdline and kdump.conf.
diff --git a/SOURCES/mkdumprd b/SOURCES/mkdumprd
index 8b09710..e2a24ae 100644
--- a/SOURCES/mkdumprd
+++ b/SOURCES/mkdumprd
@@ -6,11 +6,22 @@
 # Written by Cong Wang <amwang@redhat.com>
 #
 
+if [ -f /etc/sysconfig/kdump ]; then
+	. /etc/sysconfig/kdump
+fi
+
 [[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
 . $dracutbasedir/dracut-functions.sh
 . /lib/kdump/kdump-lib.sh
 export IN_KDUMP=1
 
+#initiate the kdump logger
+dlog_init
+if [ $? -ne 0 ]; then
+	echo "failed to initiate the kdump logger."
+	exit 1
+fi
+
 conf_file="/etc/kdump.conf"
 SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
 SAVE_PATH=$(get_save_path)
@@ -177,8 +188,8 @@ check_size() {
     fi
 
     if [ $avail -lt $memtotal ]; then
-        echo "Warning: There might not be enough space to save a vmcore."
-        echo "         The size of $2 should be greater than $memtotal kilo bytes."
+        dwarn "Warning: There might not be enough space to save a vmcore."
+        dwarn "         The size of $2 should be greater than $memtotal kilo bytes."
     fi
 }
 
@@ -250,7 +261,7 @@ verify_core_collector() {
 
     if [ "$_cmd" != "makedumpfile" ]; then
         if is_raw_dump_target; then
-            echo "Warning: specifying a non-makedumpfile core collector, you will have to recover the vmcore manually."
+            dwarn "Warning: specifying a non-makedumpfile core collector, you will have to recover the vmcore manually."
         fi
         return
     fi
@@ -340,7 +351,7 @@ is_unresettable()
         resettable="$(cat $path)"
         [ $resettable -eq 0 -a "$OVERRIDE_RESETTABLE" -eq 0 ] && {
             local device=$(udevadm info --query=all --path=/sys/dev/block/$1 | awk -F= '/DEVNAME/{print $2}')
-            echo "Error: Can not save vmcore because device $device is unresettable"
+            derror "Error: Can not save vmcore because device $device is unresettable"
             return 0
         }
     fi
@@ -374,7 +385,7 @@ is_crypt()
     eval "$line"
     [[ "$ID_FS_TYPE" = "crypto_LUKS" ]] && {
         dev=$(udevadm info --query=all --path=/sys/dev/block/$majmin | awk -F= '/DEVNAME/{print $2}')
-        echo "Device $dev is encrypted."
+        derror "Device $dev is encrypted."
         return 0
     }
     return 1
@@ -397,7 +408,7 @@ if ! check_resettable; then
 fi
 
 if ! check_crypt; then
-    echo "Warning: Encrypted device is in dump path. User will prompted for password during second kernel boot." 
+    dwarn "Warning: Encrypted device is in dump path. User will prompted for password during second kernel boot." 
 fi
 
 # firstly get right SSH_KEY_LOCATION
diff --git a/SPECS/kexec-tools.spec b/SPECS/kexec-tools.spec
index 9f59e00..6ffc4cf 100644
--- a/SPECS/kexec-tools.spec
+++ b/SPECS/kexec-tools.spec
@@ -1,6 +1,6 @@
 Name: kexec-tools
 Version: 2.0.20
-Release: 36%{?dist}
+Release: 37%{?dist}
 License: GPLv2
 Group: Applications/System
 Summary: The kexec/kdump userspace component
@@ -35,6 +35,7 @@ Source29: kdump-udev-throttler
 Source30: kdump.sysconfig.aarch64
 Source31: fadump-howto.txt
 Source32: 60-kdump.install
+Source33: kdump-logger.sh
 
 #######################################
 # These are sources for mkdumpramfs
@@ -217,6 +218,7 @@ install -m 644 %{SOURCE12} $RPM_BUILD_ROOT%{_mandir}/man8/mkdumprd.8
 install -m 644 %{SOURCE25} $RPM_BUILD_ROOT%{_mandir}/man8/kdumpctl.8
 install -m 755 %{SOURCE20} $RPM_BUILD_ROOT%{_prefix}/lib/kdump/kdump-lib.sh
 install -m 755 %{SOURCE23} $RPM_BUILD_ROOT%{_prefix}/lib/kdump/kdump-lib-initramfs.sh
+install -m 755 %{SOURCE33} $RPM_BUILD_ROOT%{_prefix}/lib/kdump/kdump-logger.sh
 %ifnarch s390x ppc64 ppc64le
 # For s390x the ELF header is created in the kdump kernel and therefore kexec
 # udev rules are not required
@@ -385,6 +387,22 @@ done
 %endif
 
 %changelog
+* Fri Nov 13 2020 Pingfan Liu <piliu@redhat.com> - 2.0.20-37
+- Doc: improve the usage documentation of the logger
+- Update the kdump sysconfig
+- Capitalize the configuration name of log level
+- Add the rd.kdumploglvl option to control log level in the second kernel
+- Appropriately converts logger numeric level to syslog log level
+- Remove unused log levels for kdump logger
+- Add sanity checks for the log levels
+- Add code comments to help better understanding
+- Doc: add a documentation for the usage of logger
+- Improve debugging in the kdump kernel
+- kdumpctl: add the '-d' option to enable the kexec loading debugging messages
+- kdump.sysconfig: add the kdump logger configurations
+- enable the logger for kdump
+- introduce the kdump logger from the dracut
+
 * Fri Nov  6 2020 Pingfan Liu <piliu@redhat.com> - 2.0.20-36
 - arm64: Enable 'kexec_file_load' by default
 - Fix, Add a kernel install hook to clean up kdump initramfs