Messages in this thread Patch in this message | | | Date | Fri, 19 Jul 2013 23:20:30 -0400 | From | Steven Rostedt <> | Subject | [for-next-3.11][PATCH 2/2] tracing: Kill the unbalanced tr->ref++ in tracing_buffers_open() |
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From: Oleg Nesterov <oleg@redhat.com>
tracing_buffers_open() does trace_array_get() and then it wrongly inrcements tr->ref again under trace_types_lock. This means that every caller leaks trace_array:
# cd /sys/kernel/debug/tracing/ # mkdir instances/X # true < instances/X/per_cpu/cpu0/trace_pipe_raw # rmdir instances/X rmdir: failed to remove `instances/X': Device or resource busy
Link: http://lkml.kernel.org/r/20130719153644.GA18899@redhat.com
Cc: Ingo Molnar <mingo@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: stable@vger.kernel.org # 3.10 Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- kernel/trace/trace.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 7d9ceab..3f24777 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4959,8 +4959,6 @@ static int tracing_buffers_open(struct inode *inode, struct file *filp) mutex_lock(&trace_types_lock); - tr->ref++; - info->iter.tr = tr; info->iter.cpu_file = tc->cpu; info->iter.trace = tr->current_trace; -- 1.7.10.4
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