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| author |   Prateek Sood <prsood@codeaurora.org> | 2019-12-10 09:15:16 +0000 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-12-21 16:05:13 -0500 |
| commit | 3a53acf1d9bea11b57c1f6205e3fe73f9d8a3688 (patch) | |
| tree | 21d329444d63cb7ad13f5b296166d201fb26f89e /samples/trace_printk/trace-printk.c | |
| parent | tracing: Have the histogram compare functions convert to u64 first (diff) | |
| download | wireguard-linux-3a53acf1d9bea11b57c1f6205e3fe73f9d8a3688.tar.xz wireguard-linux-3a53acf1d9bea11b57c1f6205e3fe73f9d8a3688.zip | |
tracing: Fix lock inversion in trace_event_enable_tgid_record()
Task T2 Task T3
trace_options_core_write() subsystem_open()
mutex_lock(trace_types_lock) mutex_lock(event_mutex)
set_tracer_flag()
trace_event_enable_tgid_record() mutex_lock(trace_types_lock)
mutex_lock(event_mutex)
This gives a circular dependency deadlock between trace_types_lock and
event_mutex. To fix this invert the usage of trace_types_lock and
event_mutex in trace_options_core_write(). This keeps the sequence of
lock usage consistent.
Link: http://lkml.kernel.org/r/0101016eef175e38-8ca71caf-a4eb-480d-a1e6-6f0bbc015495-000000@us-west-2.amazonses.com
Cc: stable@vger.kernel.org
Fixes: d914ba37d7145 ("tracing: Add support for recording tgid of tasks")
Signed-off-by: Prateek Sood <prsood@codeaurora.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'samples/trace_printk/trace-printk.c')
0 files changed, 0 insertions, 0 deletions