Re: QEMU migration-test CI intermittent failure

[Peter Xu]

On Wed, Sep 13, 2023 at 04:42:31PM -0300, Fabiano Rosas wrote:
> Stefan Hajnoczi <stefanha@redhat.com> writes:
> 
> > Hi,
> > The following intermittent failure occurred in the CI and I have filed
> > an Issue for it:
> > https://gitlab.com/qemu-project/qemu/-/issues/1886
> >
> > Output:
> >
> >   >>> QTEST_QEMU_IMG=./qemu-img MALLOC_PERTURB_=116 
> > QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon 
> > G_TEST_DBUS_DAEMON=/builds/qemu-project/qemu/tests/dbus-vmstate-daemon.sh 
> > QTEST_QEMU_BINARY=./qemu-system-x86_64 
> > /builds/qemu-project/qemu/build/tests/qtest/migration-test --tap -k
> >   ――――――――――――――――――――――――――――――――――――― ✀  
> > ―――――――――――――――――――――――――――――――――――――
> >   stderr:
> >   qemu-system-x86_64: Unable to read from socket: Connection reset by peer
> >   Memory content inconsistency at 5b43000 first_byte = bd last_byte = bc 
> > current = 4f hit_edge = 1
> >   **
> >   ERROR:../tests/qtest/migration-test.c:300:check_guests_ram: assertion 
> > failed: (bad == 0)
> >   (test program exited with status code -6)
> >
> > You can find the full output here:
> > https://gitlab.com/qemu-project/qemu/-/jobs/5080200417
> 
> This is the postcopy return path issue that I'm addressing here:
> 
> 20230911171320.24372-1-farosas@suse.de">https://lore.kernel.org/r/20230911171320.24372-1-farosas@suse.de
> Subject: [PATCH v6 00/10] Fix segfault on migration return path
> Message-ID: <20230911171320.24372-1-farosas@suse.de>

Hmm I just noticed one thing, that Stefan's failure is a ram check issue
only, which means qemu won't crash?

Fabiano, are you sure it's the same issue on your return-path fix?

I'm also trying to reproduce either of them with some loads.  I think I hit
some but it's very hard to reproduce solidly.

-- 
Peter Xu