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Re: acceptance-system-fedora failures


From: Pavel Dovgalyuk
Subject: Re: acceptance-system-fedora failures
Date: Wed, 7 Oct 2020 11:51:54 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 07.10.2020 11:23, Thomas Huth wrote:
On 07/10/2020 09.13, Philippe Mathieu-Daudé wrote:
On 10/7/20 7:20 AM, Philippe Mathieu-Daudé wrote:
On 10/7/20 1:07 AM, John Snow wrote:
I'm seeing this gitlab test fail quite often in my Python work; I don't
*think* this has anything to do with my patches, but maybe I need to try
and bisect this more aggressively.
[...]
w.r.t. the error in your build, I told Thomas about the
test_ppc_mac99/day15/invaders.elf timeouting but he said this is
not his area. Richard has been looking yesterday to see if it is
a TCG regression, and said the test either finished/crashed raising
SIGCHLD, but Avocado parent is still waiting for a timeout, so the
children become zombie and the test hang.

Expected output:

Quiescing Open Firmware ...
Booting Linux via __start() @ 0x01000000 ...

But QEMU exits in replay_char_write_event_load():

Quiescing Open Firmware ...
qemu-system-ppc: Missing character write event in the replay log
$ echo $?
1

Latest events are CHECKPOINT CHECKPOINT INTERRUPT INTERRUPT INTERRUPT.

Replay file is ~22MiB. End of record using "system_powerdown + quit"
in HMP.

I guess we have 2 bugs:
- replay log
- avocado doesn't catch children exit(1)

Quick reproducer:

$ make qemu-system-ppc check-venv
$ tests/venv/bin/python -m \
   avocado --show=app,console,replay \
   run --job-timeout 300 -t machine:mac99 \
   tests/acceptance/replay_kernel.py

Thanks, that was helpful. ... and the winner is:

     commit   55adb3c45620c31f29978f209e2a44a08d34e2da
     Author:  John Snow <jsnow@redhat.com>
     Date:    Fri Jul 24 01:23:00 2020 -0400
     Subject: ide: cancel pending callbacks on SRST

... starting with this commit, the tests starts failing. John, any idea what
might be causing this?

This patch includes the following lines:

+        aio_bh_schedule_oneshot(qemu_get_aio_context(),
+                                ide_bus_perform_srst, bus);

replay_bh_schedule_oneshot_event should be used instead of this function, because it synchronizes non-deterministic BHs.



  Thomas





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