From: Vince Weaver <vincent.weaver@maine.edu>
To: Vince Weaver <vincent.weaver@maine.edu>
Cc: Peter Zijlstra <peterz@infradead.org>,
Dave Jones <davej@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@redhat.com>, Paul Mackerras <paulus@samba.org>
Subject: Re: x86_pmu_start WARN_ON.
Date: Tue, 18 Feb 2014 17:20:57 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.2.10.1402181717300.20073@vincent-weaver-1.um.maine.edu> (raw)
In-Reply-To: <alpine.DEB.2.10.1402181327400.31682@vincent-weaver-1.um.maine.edu>
On Tue, 18 Feb 2014, Vince Weaver wrote:
> On Mon, 17 Feb 2014, Peter Zijlstra wrote:
>
> > Enable CONFIG_FRAME_POINTER for better stack traces; I suspect the
> > list_del_event() is just random stack garbage. The path that makes sense
> > is:
> > wait_rcu()->__wait_for_common()->schedule_timeout()
>
> Here's an updated stack trace on 3.14-rc3 with CONFIG_FRAME_POINTER
> enabled, in case it's helpful:
Still chasing this, although all I can add are these debug messages:
[ 140.812003] PROBLEM: n_events=2 n_added=2 VMW: idx=33 state=f00 type=0 config=0 samp_per=5e6069eb0
[ 140.812003] ALL: VMW: Num=0 idx=33 state=f00 type=0 config=0 samp_per=5e6069eb0
[ 140.812003] ALL: VMW: Num=1 idx=0 state=3 type=0 config=1 samp_per=0
So when the WARN gets triggered there only only two events in the event
list, the NMI watchdog which has already been enabled somehow (that f00
I stuck in, pmu_start sets it to f00 instead of 00 to make sure it wasn't
something stomping on memory) and the precise instructions event.
I still have a hard time following what all the schedule in code is doing.
Vince
next prev parent reply other threads:[~2014-02-18 22:19 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-30 19:02 x86_pmu_start WARN_ON Dave Jones
2014-02-10 21:26 ` Vince Weaver
2014-02-11 13:29 ` Peter Zijlstra
2014-02-12 21:04 ` Vince Weaver
2014-02-13 14:11 ` Vince Weaver
2014-02-13 17:35 ` Vince Weaver
2014-02-13 22:13 ` Vince Weaver
2014-02-17 15:28 ` Peter Zijlstra
2014-02-18 18:30 ` Vince Weaver
2014-02-18 22:20 ` Vince Weaver [this message]
2014-02-19 10:19 ` Peter Zijlstra
2014-02-19 22:34 ` Vince Weaver
2014-02-20 10:08 ` Peter Zijlstra
2014-02-20 15:47 ` Andi Kleen
2014-02-20 15:54 ` Peter Zijlstra
2014-02-20 17:31 ` Andi Kleen
2014-02-20 18:15 ` Peter Zijlstra
2014-02-20 18:23 ` Andi Kleen
2014-02-20 19:04 ` Steven Rostedt
2014-02-20 16:26 ` Steven Rostedt
2014-02-20 17:00 ` Peter Zijlstra
2014-02-20 17:43 ` Steven Rostedt
2014-02-20 17:46 ` Steven Rostedt
2014-02-20 18:18 ` Peter Zijlstra
2014-02-20 18:03 ` Vince Weaver
2014-02-20 18:23 ` Peter Zijlstra
2014-02-20 18:54 ` Vince Weaver
2014-02-20 19:21 ` Vince Weaver
2014-02-20 19:46 ` Vince Weaver
2014-02-21 14:37 ` Vince Weaver
2014-02-21 15:03 ` Peter Zijlstra
2014-02-21 20:18 ` Vince Weaver
2014-02-24 11:28 ` Peter Zijlstra
2014-02-26 5:59 ` Vince Weaver
2014-02-27 13:32 ` [tip:perf/core] perf/x86: Fix event scheduling tip-bot for Peter Zijlstra
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