Re: [PATCH] tests/qtest/migration-test: Disable migration/multifd/tcp/plain/cancel

[Peter Maydell]

On Fri, 3 Mar 2023 at 11:29, Thomas Huth <thuth@redhat.com> wrote:
>
> On 03/03/2023 12.18, Peter Maydell wrote:
> > On Fri, 3 Mar 2023 at 09:10, Juan Quintela <quintela@redhat.com> wrote:
> >> What is really weird with this failure is that:
> >> - it only happens on non-x86
> >
> > No, I have seen it on x86 macos, and x86 OpenBSD
> >
> >> - on code that is not arch dependent
> >> - on cancel, what we really do there is close fd's for the multifd
> >>    channel threads to get out of the recv, i.e. again, nothing that
> >>    should be arch dependent.
> >
> > I'm pretty sure that it tends to happen when the machine that's
> > running the test is heavily loaded. You probably have a race condition.
>
> I think I can second that. IIRC I've seen it a couple of times on my x86
> laptop when running "make check -j$(nproc) SPEED=slow" here.

Also, to repeat an offer I've made before, on my x86 macos laptop
'make check -j4' fails on this test about one time in two. If you
write a patch to add whatever logging information you would find
useful for debugging, I'm happy to do test runs with that patch
and send you the logs.

-- PMM