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| author | Brian Foster <bfoster@redhat.com> | 2023-08-31 15:55:00 +0300 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-09-02 04:26:07 +0300 |
| commit | 3d07fa1dd19035eb0b13ae6697efd5caa9033e74 (patch) | |
| tree | 81e806fe56119867bc63201156c3a7ff9e62d5bb /init | |
| parent | 2a30dbcbef96f4073d3a5f8708865b1aab0bfc6d (diff) | |
| download | linux-3d07fa1dd19035eb0b13ae6697efd5caa9033e74.tar.xz | |
tracing: Zero the pipe cpumask on alloc to avoid spurious -EBUSY
The pipe cpumask used to serialize opens between the main and percpu
trace pipes is not zeroed or initialized. This can result in
spurious -EBUSY returns if underlying memory is not fully zeroed.
This has been observed by immediate failure to read the main
trace_pipe file on an otherwise newly booted and idle system:
# cat /sys/kernel/debug/tracing/trace_pipe
cat: /sys/kernel/debug/tracing/trace_pipe: Device or resource busy
Zero the allocation of pipe_cpumask to avoid the problem.
Link: https://lore.kernel.org/linux-trace-kernel/20230831125500.986862-1-bfoster@redhat.com
Cc: stable@vger.kernel.org
Fixes: c2489bb7e6be ("tracing: Introduce pipe_cpumask to avoid race on trace_pipes")
Reviewed-by: Zheng Yejian <zhengyejian1@huawei.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'init')
0 files changed, 0 insertions, 0 deletions