Re: [Xen-devel] blkback shutdown problem ? (Re: [linux-4.9 test] 110513: regressions - FAIL)

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Mon, Jun 19, 2017 at 11:55:14AM +0100, Ian Jackson wrote:
> osstest service owner writes ("[linux-4.9 test] 110513: regressions - FAIL"):
> > flight 110513 linux-4.9 real [real]
> > http://logs.test-lab.xenproject.org/osstest/logs/110513/
> > 
> > Regressions :-(
> > 
> > Tests which did not succeed and are blocking,
> > including tests which could not be run:
> >  test-amd64-amd64-xl-credit2 19 guest-start/debian.repeat fail REGR. vs. 
> > 110456
> 
> In the spirit of trying to chase down heisenbugs: failures like this
> seem to occur occasionally.  Here are the job-specific logs:
> 
>  
> http://logs.test-lab.xenproject.org/osstest/logs/110513/test-amd64-amd64-xl-credit2/info.html
> 
> My observations looking at the logs:
> 
>  * The test was declared a failure because something, almost certainly
>    blkback, still had the LV open when osstest wanted to restart the
>    guest.  This occurred 14 seconds after `xl shutdown -w' had
>    completed and `xl list' said the domain did not exist, so it is
>    not a simple race between the old and new domains.
> 
>  * The xenstored access log shows the toolstack deleting the vbd
>    backend during the shutdown, as expected.
> 
>  * `xl list' shows two zombie domains: 17 (the recently-shut-down
>    guest) and 16 (the previous one).
> 
>  * The toolstack log shows that xl thinks it successfully shut down
>    domain 17 and then destroyed it.
> 
>  * The hotplug script log is empty.
> 
>  * I see nothing relevant in the dom0 serial log, before the failure
> 
> I conjecture that blkback is not shutting down properly.
> 
> I haven't investigated which osstest branches this occurs on and what
> the failure frequency is like.

This has already been noticed and fixed by Juergen [0], however AFAIK
the patches are not yet in Jens/Linus tree, so it's too early to
request a backport.

Roger.

[0] http://marc.info/?l=xen-devel&m=149512136831508&w=2

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