linux-kernel - Re: perf: perf sched lat segfault

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Date:	Tue, 08 Oct 2013 12:20:59 +0200
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: perf: perf sched lat segfault - bisected

On Tue, 2013-10-08 at 12:14 +0200, Mike Galbraith wrote: 
> On Tue, 2013-10-08 at 11:23 +0200, Stephane Eranian wrote: 
> > On Tue, Oct 8, 2013 at 10:41 AM, Mike Galbraith <bitbucket@...ine.de> wrote:
> > > Box: Q6600
> > >
> > > Reproducer:
> > > perf sched record -- sleep 1
> > > perf sched lat (boom)
> > >
> > I don't understand the test case here.
> > If I do this, perf sched lat complains of no trace records
> > and no kernel crash. Could you provide the full cmdline?
> 
> Hm.  That was it, just like so.
> 
> marge:/usr/local/src/kernel/linux-3.x.git/tools/perf # ./perf sched record -- sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.763 MB perf.data (~33348 samples) ]
> marge:/usr/local/src/kernel/linux-3.x.git/tools/perf # ./perf sched lat
> Segmentation fault
> marge:/usr/local/src/kernel/linux-3.x.git/tools/perf #

commit 72f3bdf7fd1003373b454bf923d3a196bbc36600
Author: Mike Galbraith <mgalbraith@...e.de>
Date:   Tue Oct 8 12:18:37 2013 +0200

    Revert "perf tools: Add attr->mmap2 support"
    
    This reverts commit 5c5e854bc760a2e2c878df3cfcf2afa4febcd511.

commit a8af8531d08d3edb37a7d67d1a4dc2e1f2f4da58
Author: Mike Galbraith <mgalbraith@...e.de>
Date:   Tue Oct 8 12:18:23 2013 +0200

    Revert "perf trace: Add mmap2 handler"
    
    This reverts commit 384c671e33a7ddf905f2c60b433b9883f0e5a605.

marge:/usr/local/src/kernel/linux-3.x.git/tools/perf # ./perf sched
record -- sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.647 MB perf.data (~28289 samples) ]
marge:/usr/local/src/kernel/linux-3.x.git/tools/perf # perf sched lat
marge:/usr/local/src/kernel/linux-3.x.git/tools/perf #

(emitted this) 

 ---------------------------------------------------------------------------------------------------------------
  Task                  |   Runtime ms  | Switches | Average delay ms | Maximum delay ms | Maximum delay at     |
 ---------------------------------------------------------------------------------------------------------------
  kworker/3:2:383       |      0.073 ms |        1 | avg:    0.020 ms | max:    0.020 ms | max at: 7197.856052 s
  sleep:24717           |      1.163 ms |        3 | avg:    0.011 ms | max:    0.022 ms | max at: 7196.884445 s
  kworker/2:1:36        |      0.097 ms |        1 | avg:    0.007 ms | max:    0.007 ms | max at: 7197.796023 s
  haveged:3547          |      0.023 ms |        2 | avg:    0.006 ms | max:    0.009 ms | max at: 7197.796345 s
  rcu_sched:9           |      0.126 ms |       14 | avg:    0.006 ms | max:    0.021 ms | max at: 7196.897051 s
  ntpd:4185             |      0.034 ms |        1 | avg:    0.004 ms | max:    0.004 ms | max at: 7197.746409 s
  kded4:4594            |      0.058 ms |        1 | avg:    0.004 ms | max:    0.004 ms | max at: 7197.422130 s
  evolution:15686       |      0.065 ms |        1 | avg:    0.004 ms | max:    0.004 ms | max at: 7196.915715 s
  pickup:21579          |      0.062 ms |        1 | avg:    0.004 ms | max:    0.004 ms | max at: 7197.329185 s
  JS Watchdog:20053     |      0.020 ms |        1 | avg:    0.004 ms | max:    0.004 ms | max at: 7197.623752 s
  perf:24716            |      3.330 ms |        1 | avg:    0.004 ms | max:    0.004 ms | max at: 7197.885690 s
  plasma-desktop:4685   |      1.632 ms |        2 | avg:    0.004 ms | max:    0.005 ms | max at: 7196.933762 s
  master:4307           |      0.104 ms |        2 | avg:    0.004 ms | max:    0.005 ms | max at: 7197.329136 s
  Xorg:4331             |      0.485 ms |        4 | avg:    0.003 ms | max:    0.005 ms | max at: 7197.010801 s
  ksoftirqd/2:18        |      0.014 ms |        1 | avg:    0.003 ms | max:    0.003 ms | max at: 7196.897039 s
  alsa-sink:5282        |      0.000 ms |      200 | avg:    0.003 ms | max:    0.003 ms | max at: 7196.905149 s
  migration/3:22        |      0.000 ms |        1 | avg:    0.002 ms | max:    0.002 ms | max at: 7196.884423 s
 -----------------------------------------------------------------------------------------
  TOTAL:                |      7.285 ms |      237 |
 ---------------------------------------------------

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