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From 8f0ef3e08aaef134ec4acfe87a6628b3fda2243c Mon Sep 17 00:00:00 2001
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From: Don Zickus <dzickus@redhat.com>
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Date: Wed, 22 Jul 2015 13:58:53 -0400
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Subject: [PATCH] ppc64le sync grub.cfg changes to disk (#1212114)
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After installing a new kernel, if a panic is induced, not all the kernel
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pieces are on the disk (most importantly the grub.cfg changes). This can
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lead to a hung system on a reboot because the older kernel can not be found.
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Address this by forcing all the changes (mainly the fs meta data) to disk
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before finishing the kernel package installation.
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Tested by 'yum install kernel-...; echo c > /proc/sysrq-trigger'.
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Before, the machine would panic and on reboot be stuck without a grub.cfg
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to read. After, works as expected.
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Related: rhbz#1212114
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---
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new-kernel-pkg | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/new-kernel-pkg b/new-kernel-pkg
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index 1f6ab39..90652da 100755
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--- a/new-kernel-pkg
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+++ b/new-kernel-pkg
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@@ -927,4 +927,12 @@ fi
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# if we mounted the U-Boot directory, unmount it.
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[ -n "$mounted" ] && umount $ubootDir
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+# make sure changes make it to the disk.
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+# if /boot is a mountpoint, force the meta data on disk
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+# to by-pass writeback delay.
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+# PPC64LE-only to deal with Petitboot issues
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+if [ "$ARCH" = "ppc64le" ]; then
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+ sync && mountpoint -q /boot &&fsfreeze -f /boot && fsfreeze -u /boot
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+fi
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+
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exit 0
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--
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1.8.3.1
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