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Message-ID: <1372276335.18733.271.camel@gandalf.local.home>
Date: Wed, 26 Jun 2013 15:52:15 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Dave Jones <davej@...hat.com>
Cc: Oleg Nesterov <oleg@...hat.com>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Linux Kernel <linux-kernel@...r.kernel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Andrey Vagin <avagin@...nvz.org>
Subject: Re: frequent softlockups with 3.10rc6.
On Wed, 2013-06-26 at 01:23 -0400, Dave Jones wrote:
> On Tue, Jun 25, 2013 at 12:23:34PM -0400, Steven Rostedt wrote:
>
> > Now, what we can try to do as well, is to add a trigger to disable
> > tracing, which should (I need to check the code) stop tracing on printk.
> > To do so:
> >
> > # echo printk:traceoff > /sys/kernel/debug/tracing/set_ftrace_filter
> >
> > This will add a trigger to the printk function that when called, will
> > disable tracing. If it is hit before you get your trace, you can just
> > re-enable tracing with:
> >
> > # echo 1 > /sys/kernel/debug/tracing/tracing_on
> >
> > Hmm, no it needs a fix to make this work. I applied a patch below that
> > should do this correctly (and will put this into my 3.11 queue).
> >
> > If you run the test again with this change and with the above filter, it
> > should stop the trace before overwriting the first dump, as it should
> > ignore the printk output.
>
> I think something isn't right with this patch.
> After 10 hours, I hit the bug again, but...
>
> (01:21:28:root@...ary:tracing)# cat trace
> # tracer: preemptirqsoff
> #
> (01:21:30:root@...ary:tracing)#
>
Did you apply the patch I added to my last email. It should have prevent
that form happening :-/
-- Steve
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