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apport-collect 1987232
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This change has been made by an automated script, maintained by the
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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1987232
Title:
WARN in trace_event_dyn_put_ref
Status in linux package in Ubuntu:
Incomplete
Bug description:
I have systems that are regularly hitting a WARN in
trace_event_dyn_put_ref.
The exact message is:
WARNING: CPU: 1 PID: 30309 at kernel/trace/trace_dynevent.c:46
+trace_event_dyn_put_ref+0x15/0x20
With the following stacktrace:
perf_trace_init+0x8f/0xd0
perf_tp_event_init+0x1f/0x40
perf_try_init_event+0x4a/0x130
perf_event_alloc+0x497/0xf40
__do_sys_perf_event_open+0x1d4/0xf70
__x64_sys_perf_event_open+0x20/0x30
do_syscall_64+0x5c/0xc0
entry_SYSCALL_64_after_hwframe+0x44/0xae
I've debugged this and worked with upstream to get a fix into Linux.
It was recently merged in 6.0-rc2. See here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.0-rc2&id=7249921d94ff64f67b733eca0b68853a62032b3d
The problem started appearing as soon as our systems picked up the
linux-aws-5.15 branch for Focal. (That was 5.15.0-1015-aws, if memory
serves). Could you please cherry pick this fix and pull it back to
the the linux and linux-aws kernels for Focal? There's test here:
https://lore.kernel.org/all/cover.1660347763.git.k...@templeofstupid.com/
that reproduces the problem very reliably for me. With the patch
applied, I no longer get the WARNs.
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