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Random backtrace regarding preemptive scheduling and systemd-udevd #164

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lucbeaufils opened this issue Mar 1, 2023 · 1 comment
Open

Random backtrace regarding preemptive scheduling and systemd-udevd #164

lucbeaufils opened this issue Mar 1, 2023 · 1 comment
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bug Something isn't working Debian

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@lucbeaufils
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backtrace test didn't pass on virtu3 (SEAPATH-0080)
dump_dmesg.txt
@deribaucourt
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Back trace present after the usual ------------[ cut here ]------------
Seems to be random.

At a quick glance, looks like a race condition with rt-kernel and systemd-udevd:
BUG: scheduling while atomic: systemd-udevd/651/0x00000003
Triggering another backtrace:
WARNING: CPU: 12 PID: 651 at kernel/sched/core.c:5781 preempt_count_sub+0x5e/0xa0

See attached trace for more info.

@deribaucourt deribaucourt added bug Something isn't working Debian labels Mar 1, 2023
@deribaucourt deribaucourt changed the title backtrace failed on virtu3 during CI Random backtrace regarding preemptive scheduling and systemd-udevd Mar 1, 2023
@eroussy eroussy mentioned this issue Mar 20, 2023
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eroussy added a commit to eroussy/ci-seapath that referenced this issue Mar 20, 2023
@eroussy
launch.sh: ignore a kernel test that randomly failed
99ac83b 
The test "SEAPATH-00080 - no backtraces" randomly failed and block the
CI.
This commit allow the CI to pass even if this test fails.
The test will still be integrated in the test report and a warning will
be displayed in the CI logs.

An issue is open for this bug on the ansible repo :
seapath/ansible#164

Signed-off-by: Erwann Roussy <erwann.roussy@savoirfairelinux.com>
eroussy added a commit to seapath/ci that referenced this issue Mar 20, 2023
@eroussy
launch.sh: ignore a kernel test that randomly failed
5a897ea 
The test "SEAPATH-00080 - no backtraces" randomly failed and block the
CI.
This commit allow the CI to pass even if this test fails.
The test will still be integrated in the test report and a warning will
be displayed in the CI logs.

An issue is open for this bug on the ansible repo :
seapath/ansible#164

Signed-off-by: Erwann Roussy <erwann.roussy@savoirfairelinux.com>
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@deribaucourt @lucbeaufils