Bug#782793: systemd: ext4 filesystem on lvm on raid causes boot to enter emergency shell

[Michael Biebl]

Control: reassign -1 lvm2
Control: forcemerge 782865 -1


Hi there

On Thu, 23 Apr 2015 19:30:00 -0700 Rick Thomas <rbthomas at pobox.com> wrote:
> 
> On Apr 23, 2015, at 2:31 PM, Michael Biebl <biebl at debian.org> wrote:
> 
> > Am 23.04.2015 um 21:47 schrieb Rick Thomas:
> >> 
> >> On Apr 23, 2015, at 1:29 AM, Michael Biebl <biebl at debian.org> wrote:
> >> 
> >>> There might be a race somewhere, i.e. lvm2-activation(-early).service
> >>> being run *before* mdadm has assembled the RAID.
> >>> 
> >>> You could test this theory, be artifically delaying those two services.
> >>> Copy them to /etc/systemd/system, and add a ExecStartPre=/bin/sleep 30
> >>> to the [Service] section of those two units.
> >> 
> >> 
> >> So
 That worked (adding a 30-second delay) twice in a row.
> >> 
> >> Let me know if you want to see a log with debug turned on for such a reboot.
> >> 
> > 
> > Ok, I guess I have bad news then.
> > lvm2 in jessie is not really hotplug aware. The
> > lvm2-activation(-early).service units run at a static, fixed time during
> > boot. You'd need something like lvm2's lvmetad support [1]. I tried to
> > enable that in Debian today, but failed miserably due to various bugs
> > (already filed 3 bugs today regarding lvmetad).
> > Ultimately, this is something which needs to be fixed in lvm2 and at
> > this point I don't think there is a lot more that I can do from the
> > systemd side.
> > 
> > Sorry for the unsatisfying answer.
> > 
> > Regards,
> > Michael
> > 
> > 
> > 
> > [1]
> > https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Logical_Volume_Manager_Administration/metadatadaemon.html
> 
> No reason to be sorry!
> 
> First of all, you have given me two solid work-arounds to the problem
> (#1 the 30-second delay you suggested; #2 the cron reboot script I
> wrote based on your preliminary suggestions.)
> 
> Second, you have filed bug reports that (hopefully) will be a prod to
> get the real problem worked on by those folks who are able to
> actually fix it.
> 
> This is what the open-source philosophy is all about: Given enough
> eyeballs, all bugs are shallow!  We each contributed a pair of
> eyeballs to this bug.  Now it’s time for others to contribute
> theirs.
> 
> Early on, I cloned this bug as 782865 and re-assigned it to lvm2.
> You may want to close the clone and re-assign this one to lvm2 so the
> folks in that part of the woods have access to the full record.  I’ll
> leave that up to you because you probably know more about the proper
> procedures and protocols than I do.


I'll reassign and merge the two bug reports. Thanks for the hint.

Regards,
Michael
-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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