linux-kernel - Re: [3.4-rc3] Thread overran stack, or stack corrupted

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Date:	Tue, 17 Apr 2012 23:15:57 -0400
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [3.4-rc3] Thread overran stack, or stack corrupted

On Tue, Apr 17, 2012 at 10:27:05PM -0400, Steven Rostedt wrote:

 > Note we have something that checks the stack, even on leaf functions.
 > 
 > Enable CONFIG_STACK_TRACER
 > 
 > and then enable it with the following:
 > 
 > # echo 1 > /proc/sys/kernel/stack_tracer_enabled
 > # cat /sys/kernel/debug/tracing/stack_trace
 >         Depth    Size   Location    (40 entries)
 >         -----    ----   --------
 >   0)     3056     208   select_task_rq_fair+0x30b/0x8b2
 >   1)     2848      96   try_to_wake_up+0xc7/0x30e

That looks handy. Doesn't seem to work for me though on my test box.
(config option is enabled.)

# echo 1 > /proc/sys/kernel/stack_tracer_enabled
# cat /sys/kernel/debug/tracing/stack_trace
        Depth    Size   Location    (-1 entries)
        -----    ----   --------

That's all she wrote.

	Dave
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