File 1014-mdmon-compensate-for-removal-of-KillMode-none.patch of Package mdadm.28825

From c21189378cc293280e36e3d999e3105d97458a6b Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Mon, 23 Jan 2023 14:29:16 +1100
Subject: [PATCH] mdmon: compensate for removal of KillMode=none

mdmon needs to keep running during the switchroot out of (at boot) and
then back into (at shutdown) the initrd.  It runs until a new mdmon
takes over.
Killmode=none used to achieve this, with the help of --offroot which
sets argv[0][0] to '@' which systemd understands.

However mdmon currently is run in system-mdmon.slice which conflicts
with shutdown.target so mdmon get killed early in shutdown when
system.mdmon.slice is removed.

As described in systemd.service(5), this conflict which shutdown can be
resolved by requesting system.slice, which is a natural counterpart to
DefaultDependencies=no.

So add that, and also add IgnoreOnIsolate=true to avoid another possible
source of an early death.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 systemd/mdmon@.service |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/systemd/mdmon@.service
+++ b/systemd/mdmon@.service
@@ -9,6 +9,9 @@
 Description=MD Metadata Monitor on /dev/%I
 DefaultDependencies=no
 Before=initrd-switch-root.target
+# allow this to keep running after switchroot, until a new
+# instance is started
+IgnoreOnIsolate=true
 
 [Service]
 # The mdmon starting in the initramfs (with dracut at least)
@@ -21,4 +24,6 @@ ExecStart=BINDIR/mdmon --foreground --of
 # it out) and systemd will remove it when transitioning from
 # initramfs to rootfs.
 #PIDFile=/run/mdadm/%I.pid
-KillMode=none
+# The default slice is system-mdmon.slice which Conflicts
+# with shutdown, causing mdmon to exit early.  So use system.slice.
+Slice=system.slice