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

["Cédric Le Goater" <clegoate@redhat.com>]

On 10/31/23 21:19, Vikram Garhwal wrote:
> 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

I simply ran :

while [ 1 ]; do QTEST_QEMU_BINARY=build/aarch64-softmmu/qemu-system-aarch64 QTEST_QEMU_IMG=qemu-img build/tests/qtest/xlnx-canfd-test || break; done
....
# starting QEMU: exec build/aarch64-softmmu/qemu-system-aarch64 -qtest unix:/tmp/qtest-689050.sock -qtest-log /dev/null -chardev socket,path=/tmp/qtest-689050.qmp,id=char0 -mon chardev=char0,mode=control -display none -audio none -machine xlnx-versal-virt -object can-bus,id=canbus -machine canbus0=canbus -machine canbus1=canbus -accel qtest
**
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)
Bail out! 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)
Aborted (core dumped)


It is always the same error : 0x88000000 == 0x80000000

Thanks,

C.

> 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.
>>
>