Bug 2101793

Summary:	dmeventd needs to quit upon receiving SIGTERM
Product:	Red Hat Enterprise Linux 8	Reporter:	Renaud Métrich <rmetrich>
Component:	lvm2	Assignee:	LVM Team <lvm-team>
lvm2 sub component:	dmeventd	QA Contact:	cluster-qe <cluster-qe>
Status:	NEW ---	Docs Contact:
Severity:	medium
Priority:	medium	CC:	agk, heinzm, jbrassow, msnitzer, prajnoha, thornber, zkabelac
Version:	8.6	Keywords:	Triaged
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Last Closed:		Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Comment 1 Zdenek Kabelac 2022-06-28 16:57:11 UTC

User is supposed to  *UNMONITOR*  LVs  before  quiting dmeventd.

'dmveventd' is protected  against signal - so processed commands which *MAY* freeze your system (i.e.  suspend devices) aren't leaving  system in unusable state.

So I'm not sure what  '--force reboot' is doing - but  it should run   'vgchange --monitor n' first.

This is not seen as bug in dmeventd -  rather some logical problem with  reboot sequence.

Comment 2 Renaud Métrich 2022-06-29 07:29:01 UTC

Hi Zdenek,

From your comment, I understand it's really necessary to go through the normal shutdown sequence, so I think there is nothing to do on this side.
Specifically here we need lvm2-monitor.service to stop, which will lead to stopping dmeventd.service as well.
This is what I see on normal shutdown:
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------
Jun 28 10:04:36.507032 vm-thin8 systemd[1]: Stopped Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling.
...
Jun 28 10:04:36.514671 vm-thin8 dmeventd[873]: dmeventd detected break while being idle for 0 second(s), exiting.
Jun 28 10:04:36.514675 vm-thin8 dmeventd[873]: dmeventd shutting down.
-------- 8< ---------------- 8< ---------------- 8< ---------------- 8< --------