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

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Date:	Wed, 18 Apr 2012 00:06:32 -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 11:57:21PM -0400, Steven Rostedt wrote:
 
 > >  > This would show what functions the stack tracer is using.
 > >  > 
 > >  > I just compiled the latest vanilla kernel and tried it out, and it
 > >  > worked for me.
 > > 
 > > works on my other machines too with similar kernel configs, just not on the one I'm profiling.
 > 
 > I have to ask. Is this a x86 box?

yeah, 64-bit Xeon circa 2008.
 
 > Also, have you tested to see if function tracing works?
 > 
 > # cd /sys/kernel/debug/tracing
 > # echo function > current_tracer
 > # cat trace
 > 
 > If function tracing doesn't work this wouldn't either.

That just prints out..

# tracer: function
#
# entries-in-buffer/entries-written: 0/0   #P:4
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |

 > I'm also assuming you have CONFIG_STACKTRACE and
 > CONFIG_STACKTRACE_SUPPORT enabled. They should be selected, but configs
 > can always get screwed up.

CONFIG_STACKTRACE_SUPPORT=y
CONFIG_STACKTRACE=y

	Dave
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