linux-kernel - Re: BUG: Function graph tracer hang

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Date:	Sun, 3 May 2009 11:02:16 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: BUG: Function graph tracer hang


* Steven Rostedt <rostedt@...dmis.org> wrote:

> > > This is low in my priority of things to do, but I'll at least 
> > > add it to my "to do" list.
> > 
> > I think we should mark the branch tracer as CONFIG_BROKEN - 
> > there's been too many problems with it. Thoughts?
> 
> You mean the branch profiler? I've been using it without any 
> issues. The issues usually come when we have it combined with 
> other tracers on large(?) SMP boxes. I don't hit the cacheline 
> bouncing hang on my 4 cores.

i got a boot crash in the branch tracer:

[    4.472909] calling  init_wakeup_tracer+0x0/0x30 @ 1
[    4.478220] Testing tracer wakeup: PASSED
[    4.798372] Testing tracer wakeup_rt: PASSED
[    5.114742] initcall init_wakeup_tracer+0x0/0x30 returned 0 after 621644 usecs
[    5.122275] calling  stack_trace_init+0x0/0x70 @ 1
[    5.127771] initcall stack_trace_init+0x0/0x70 returned 0 after 396 usecs
[    5.134836] calling  init_graph_trace+0x0/0x20 @ 1
[    5.139950] Testing tracer function_graph: PASSED
[    7.088654] initcall init_graph_trace+0x0/0x20 returned 0 after 1903070 usecs
[    7.096080] calling  init_branch_tracer+0x0/0x40 @ 1
[    7.101400] Testing tracer branch: 

config attached.

	Ingo

View attachment "config-Sat_May__2_11_01_17_CEST_2009.bad" of type "text/plain" (69185 bytes)