Bug 1159641

Summary:	systemd-debug-shell service hangs writing log to persisent storage and then shuts downs
Product:	[Fedora] Fedora	Reporter:	Bruno Wolff III <bruno>
Component:	systemd	Assignee:	systemd-maint
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	rawhide	CC:	bruno, johannbg, jsynacek, ktmdms, lnykryn, mschmidt, msekleta, s, systemd-maint, vpavlin, zbyszek
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	kmod-18-4.fc21	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-11-05 01:23:41 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Bruno Wolff III 2014-11-02 14:09:17 UTC

Description of problem:
I was trying to use systemd-debug-shell to try to capture some logs from the boot so I could try to figure out why very recent kernels have been messing up the boot process without actual crashing. No logs were making it to permanent storage making it hard to narrow things down.

When I enabled systemd-debug-shell then the boots starting hanging for a while writing logs to persistent storage. When I left the machine for a while and came back I would find the machine shutdown instead of at a shell prompt.

systemd-217-2.fc22.i686

Comment 1 Zbigniew Jędrzejewski-Szmek 2014-11-02 18:21:57 UTC

The hang I have no idea about. But the shutting-off part is #1154768.

Comment 2 Fedora Update System 2014-11-03 13:24:14 UTC

kmod-18-4.fc21,systemd-216-7.fc21 has been submitted as an update for Fedora 21.
https://admin.fedoraproject.org/updates/kmod-18-4.fc21,systemd-216-7.fc21

Comment 3 Bruno Wolff III 2014-11-04 13:09:20 UTC

I have an update on the hanging part. It is now happening on regular boots very roughly 50% of the time. There is no limit for copying the logs to persistent storage. I have checked after almost 15 minutes and seen it still waiting. During a couple of the debug shell runs it did eventually timeout, but in those cases I left it for a couple of hours. On boots where the issue doesn't happen, I don't notice a pause at the copying logs to persistent storage step at all. I have only seen this happen in rawhide so far.

Comment 4 kevin martin 2014-11-04 17:32:54 UTC

I wonder if this is the same thing that is happening when I do a reboot.  The system hangs after shutting down X and never seems to come out of the hang.  Maybe they are related issues.

Comment 5 Michal Schmidt 2014-11-04 19:34:42 UTC

The hanging flush should be fixed by:

http://cgit.freedesktop.org/systemd/systemd/commit/?id=a87a38c20196a4aeb56b6ba71d688eefd0b21c30

Comment 6 Bruno Wolff III 2014-11-04 19:39:25 UTC

Thanks! That is an easy change to do locally if I don't want to wait for an update.

Comment 7 Fedora Update System 2014-11-05 13:17:30 UTC

kmod-18-4.fc21,systemd-216-10.fc21 has been submitted as an update for Fedora 21.
https://admin.fedoraproject.org/updates/kmod-18-4.fc21,systemd-216-10.fc21

Comment 8 Fedora Update System 2014-11-12 02:38:27 UTC

kmod-18-4.fc21, systemd-216-11.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.