From: Oleg Nesterov <oleg@redhat.com>
To: Ingo Molnar <mingo@redhat.com>, Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH] tracing: Kill the unbalanced tr->ref++ in tracing_buffers_open()
Date: Fri, 19 Jul 2013 17:36:44 +0200 [thread overview]
Message-ID: <20130719153644.GA18899@redhat.com> (raw)
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
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
kernel/trace/trace.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ee471fb..278c5f5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4944,8 +4944,6 @@ 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;
--
1.5.5.1
reply other threads:[~2013-07-19 15:41 UTC|newest]
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