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

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Mon, Jun 19, 2017 at 12:27:33PM +0100, Roger Pau Monné wrote:
> 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

I will send the git pull tomorrow. Thanks.

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