From f264cfbe8a9fa36765c918db9d7074a89eedbcd6 Mon Sep 17 00:00:00 2001

From: Lukas Nykryn <lnykryn@redhat.com>

Date: Mon, 11 Jun 2018 11:07:59 +0200

Subject: [PATCH] dracut.sh: workaround broken read from /proc/modules

RHEL-only (upstream is using libkmod)

Resolves: #1578222

---

 dracut.sh | 21 +++++++++++++++++----

 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/dracut.sh b/dracut.sh

index 873274c0..9dadece0 100755

--- a/dracut.sh

+++ b/dracut.sh

@@ -1145,10 +1145,23 @@ if [[ $hostonly ]]; then

     # check /proc/modules

     declare -A host_modules

-    while read m rest; do

-        [ -z "$m" ] && continue

-        host_modules["$m"]=1

-    done 

+    declare new_module_found=1

+    declare tmpmodules=$(mktemp --tmpdir="$TMPDIR/" -t proc_modules.XXXXXX)

+    while [[ $new_module_found ]]; do

+        new_module_found=

+        sleep 0.1

+        #reading from procfs can be broken, so copy the file elsewhere

+        cp -f /proc/modules "$tmpmodules"

+        while read m rest; do

+            [ -z "$m" ] && continue

+            [[ ${host_modules["$m"]} ]] && continue

+            host_modules["$m"]=1

+            new_module_found=1

+        done < "$tmpmodules"

+    done

+    rm "$tmpmodules"

+    unset new_module_found

+    unset tmpmodules

 fi

 unset m