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From 9cc6ee46e0083bc36b53d19e14fb637f7a1542dd Mon Sep 17 00:00:00 2001
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From: Alexander Graf <graf@amazon.com>
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Date: Thu, 9 Jun 2022 16:20:43 +0200
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Subject: [PATCH] pstore: Run after modules are loaded
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The systemd-pstore service takes pstore files on boot and transfers them
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to disk. It only does it once on boot and only if it finds any. The typical
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location of the pstore on modern systems is the UEFI variable store.
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Most distributions ship with CONFIG_EFI_VARS_PSTORE=m. That means, the
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UEFI variable store is only available on boot after the respective module
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is loaded.
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In most situations, the pstore service gets loaded before the UEFI pstore,
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so we don't get to transfer logs. Instead, they accumulate, filling up the
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pstore over time, potentially breaking the UEFI variable store.
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Let's add a service dependency on any kernel module that can provide a
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pstore to ensure we only scan for pstate after we can actually see pstate.
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I have seen live occurences of systems breaking because we did not erase
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the pstates and ran out of UEFI nvram space.
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Fixes https://github.com/systemd/systemd/issues/18540
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(cherry picked from commit 70e74a5997ae2ce7ba72a74ac949c3b2dad1a1d6)
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Related: #2158832
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---
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units/systemd-pstore.service.in | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/units/systemd-pstore.service.in b/units/systemd-pstore.service.in
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index 8cbf264a99..1983a9738f 100644
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--- a/units/systemd-pstore.service.in
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+++ b/units/systemd-pstore.service.in
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@@ -16,6 +16,8 @@ DefaultDependencies=no
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After=systemd-remount-fs.service
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Conflicts=shutdown.target
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Before=sysinit.target shutdown.target
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+After=modprobe@efi_pstore.service modprobe@mtdpstore.service modprobe@chromeos_pstore.service modprobe@ramoops.service modprobe@pstore_zone.service modprobe@pstore_blk.service
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+Wants=modprobe@efi_pstore.service modprobe@mtdpstore.service modprobe@chromeos_pstore.service modprobe@ramoops.service modprobe@pstore_zone.service modprobe@pstore_blk.service
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[Service]
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Type=oneshot
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