Re: [Xen-devel] [xen-unstable test] 56759: regressions - FAIL

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.05.15 at 18:04, <ian.campbell@xxxxxxxxxx> wrote:
> On Tue, 2015-05-26 at 14:29 +0100, Ian Campbell wrote:
>> On Wed, 2015-05-20 at 10:56 +0100, Ian Campbell wrote:
>> > On Wed, 2015-05-20 at 09:34 +0000, osstest service user wrote:
>> > > flight 56759 xen-unstable real [real]
>> > > http://logs.test-lab.xenproject.org/osstest/logs/56759/ 
>> > > 
>> > > Regressions :-(
>> > > 
>> > > Tests which did not succeed and are blocking,
>> > > including tests which could not be run:
>> > >  test-armhf-armhf-xl-multivcpu 17 leak-check/check         fail REGR. 
>> > > vs. 56375
>> > 
>> > I'm pretty hard pressed to explain this from the set of commits
>> > currently under test, but it has happened a few times now (e.g. 56700
>> > 56576) so it does seem to be real.
>> > 
>> > 
> http://logs.test-lab.xenproject.org/osstest/results/bisect.xen-unstable.test-ar
>  
> mhf-armhf-xl-multivcpu.leak-check--check.html
>> > is working on it and is currently consider the set of changes from:
>> > ianc@cosworth:xen.git$ git log --oneline 9ab42~1...45fcc4
>> > 45fcc45 use ticket locks for spin locks
>> > e13013d libxc/restore: add checkpointed flag to the restore context
>> > ce44b40 libxc/restore: introduce setup() and cleanup() on restore
>> > c5c5a04 libxc/restore: split read/handle qemu info
>> > 9ab42c9 libxc/restore: introduce process_record()
>> > 
>> > where e13013d is current master which was pushed in by flight 56375.
>> > 
>> > I think it unlikely the libxl stuff is responible, given we don't
>> > migrate on ARM, which would seem to point to the ticket locks...
>> 
>> I've now managed to reproduce using the arndale on my desk.
> 
> ... and now I've confirmed that reverting the spin lock change causes
> the issue to not happen any more.

Considering that this issue has prevented a push for almost
two weeks, I think we ought to consider reverting the two
offending commits until the problem got sorted out.

Jan


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