Re: 2.6.33: ftrace triggers soft lockup

From: AmÃrico Wang
Date: Wed Mar 03 2010 - 21:58:52 EST

On Wed, Mar 3, 2010 at 9:05 PM, Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
> On Wed, 2010-03-03 at 14:04 +0800, AmÃrico Wang wrote:
>> Hi, Steven, Frederic, Ingo,
>> I am not sure if this is ftrace's fault, but it is ftrace who triggers
>> the soft lockup. On my machine, it is pretty easy, just run:
>> echo function_graph > current_tracer
>> I found this when 2.6.33-rc7, but forgot to report here. I just tried today's
>> Linus tree, it still has this problem.
>> Attached are the full soft lockup warnings.
>> Below is my related configs:
> Actually this is not enough for me. Could you send me the full config,
> as well as the full dmesg, not just the dump.

Full dmesg:
Full config:

Note, I changed some tracing unrelated config after getting that soft lockup,
so it would not matter.
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