Re: intermittent qtest-aarch64/xlnx-canfd-test test failure

[Vikram Garhwal]

Hi Michael & Cedric,
On Mon, Oct 30, 2023 at 05:19:38PM +0100, Cédric Le Goater wrote:
> On 9/21/23 09:51, Michael Tokarev wrote:
> > Hi!
> > 
> > While doing stable-8.1.1 preparation, I've a CI failure of 
> > ubuntu-20.04-s390x-all here:
> > 
> > https://gitlab.com/qemu-project/qemu/-/jobs/5132720046
> > 
> > ▶ ERROR:../tests/qtest/xlnx-canfd-test.c:265:match_rx_tx_data: \
> >    assertion failed ((buf_rx[size] & DLC_FD_BIT_MASK) == (buf_tx[size] & 
> > DLC_FD_BIT_MASK)): (2281701376 == 2147483648)
> > 
> >   qemu:qtest+qtest-aarch64 / qtest-aarch64/xlnx-canfd-test  \
> >             ERROR           0.77s   killed by signal 6 SIGABRT
> > 
> > Re-run of this test went successfully.  However, the assert looks
> > a bit scary, and the fact that it does not fail in a reliable way
> > is a bit troubling too.  Is it a flaky test or there's something
> > else in qemu with concurrent threads?
> > 
> > I don't see this assert in previous test runs.  But ubuntu-20.04-s390x-all
> > test fails quite often due to other reasons, so it isn't conclusive.
> > 
> > Should something be done with this?
> > 
> > The testing is done for commit f2fc49c302036315db6e8c9f74592decc3be0476,
> > which is in staging-8.1 branch only temporarily.
> > 
I tried with staging-8.1 and didn't see this error. I ran it with 
registry.gitlab.com/legoater/qemu/qemu/fedora-i386-cross:latest on a x86 host 
machine. Can you please share more about how you are running
the testes? It will be greatly helpful to me in reproducing the issue and fixing
it.
> > Thanks,
> > 
> > /mjt
> > 
> 
> I had the same CI error in job 
> https://gitlab.com/legoater/qemu/-/jobs/5416150239
> ▶ 170/258 ERROR:../tests/qtest/xlnx-canfd-test.c:265:match_rx_tx_data: 
> assertion failed ((buf_rx[size] & DLC_FD_BIT_MASK) == (buf_tx[size] & 
> DLC_FD_BIT_MASK)): (2281701376 == 2147483648) ERROR
> 170/258 qemu:qtest+qtest-aarch64 / qtest-aarch64/xlnx-canfd-test           
> ERROR           0.49s   killed by signal 6 SIGABRT
> > > > QTEST_QEMU_BINARY=./qemu-system-aarch64 
> > > > PYTHON=/builds/legoater/qemu/build/pyvenv/bin/python3 
> > > > MALLOC_PERTURB_=60 
> > > > G_TEST_DBUS_DAEMON=/builds/legoater/qemu/tests/dbus-vmstate-daemon.sh 
> > > > /builds/legoater/qemu/build/tests/qtest/xlnx-canfd-test --tap -k
> ――――――――――――――――――――――――――――――――――――― ✀  ―――――――――――――――――――――――――――――――――――――
> stderr:
> **
> ERROR:../tests/qtest/xlnx-canfd-test.c:265:match_rx_tx_data: assertion failed 
> ((buf_rx[size] & DLC_FD_BIT_MASK) == (buf_tx[size] & DLC_FD_BIT_MASK)): 
> (2281701376 == 2147483648)
> (test program exited with status code -6)
> 
> I could reproduce on PPC64 and s390x systems.
> 
> C.
>