ring-buffer: fix dangling commit race

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Impact: fix stuck trace-buffers

If an interrupt comes in during the rb_set_commit_to_write and
pushes the tail page forward just at the right time, the commit
updates will miss the adding of the interrupt data. This will
cause the commit pointer to cease from moving forward.

Thanks to Jiaying Zhang for finding this race.

Reported-by: Jiaying Zhang <jiayingz@google.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

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Steven Rostedt 2008-12-23 11:32:24 -05:00 • committed by Ingo Molnar

parent 30cd324e97

commit a8ccf1d6f6

1 changed files with 12 additions and 0 deletions

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kernel/trace/ring_buffer.c

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