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

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Message-ID: <CABPqkBRMa7rawfvQ2Sunc2tr87s_WqT_7GYac6+x=SNZoJSueg@mail.gmail.com>
Date:	Tue, 8 Oct 2013 11:23:35 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Mike Galbraith <bitbucket@...ine.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: perf: perf sched lat segfault - bisected

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?


> The bisect winner:
>
> marge:/usr/local/src/kernel/linux-3.x.git # git bisect good
> 5c5e854bc760a2e2c878df3cfcf2afa4febcd511 is the first bad commit
> commit 5c5e854bc760a2e2c878df3cfcf2afa4febcd511
> Author: Stephane Eranian <eranian@...gle.com>
> Date:   Wed Aug 21 12:10:25 2013 +0200
>
>     perf tools: Add attr->mmap2 support
>
>     This patch adds support for the new PERF_RECORD_MMAP2 record type
>     exposed by the kernel. This is an extended PERF_RECORD_MMAP record.
>
>     It adds for each file-backed mapping the device major, minor number and
>     the inode number and generation.
>
>     This triplet uniquely identifies the source of a file-backed mapping. It
>     can be used to detect identical virtual mappings between processes, for
>     instance.
>
>     The patch will prefer MMAP2 over MMAP.
>
>     Signed-off-by: Stephane Eranian <eranian@...gle.com>
>     Cc: Andi Kleen <ak@...ux.intel.com>
>     Cc: David Ahern <dsahern@...il.com>
>     Cc: Ingo Molnar <mingo@...e.hu>
>     Cc: Jiri Olsa <jolsa@...hat.com>
>     Cc: Namhyung Kim <namhyung.kim@....com>
>     Cc: Peter Zijlstra <peterz@...radead.org>
>     Link: http://lkml.kernel.org/r/1377079825-19057-3-git-send-email-eranian@google.com
>     [ Cope with 314add6 "Change machine__findnew_thread() to set thread pid",
>       fix 'perf test' regression test entry affected,
>       use perf_missing_features.mmap2 to fallback to not using .mmap2 in older kernels,
>       so that new tools can work with kernels where this feature is not present ]
>     Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
>
> :040000 040000 2d600afbdd11b323bbcd00a4c6b50ee82a604acc d2a81503d08aeea994e203245358ae939eb5e787 M      tools
>
>
> git bisect start
> # bad: [8b5ede69d24db939f52b47effff2f6fe1e83e08b] powerpc/irq: Don't switch to irq stack from softirq stack
> git bisect bad 8b5ede69d24db939f52b47effff2f6fe1e83e08b
> # good: [6e4664525b1db28f8c4e1130957f70a94c19213e] Linux 3.11
> git bisect good 6e4664525b1db28f8c4e1130957f70a94c19213e
> # good: [57d730924d5cc2c3e280af16a9306587c3a511db] Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect good 57d730924d5cc2c3e280af16a9306587c3a511db
> # good: [d8cacd3a259bf522ea5e6c4c60eba67ba22f599c] Merge tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux
> git bisect good d8cacd3a259bf522ea5e6c4c60eba67ba22f599c
> # good: [b55ee2816ed6d8f8a00d4badab0e3642ffbac19f] Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect good b55ee2816ed6d8f8a00d4badab0e3642ffbac19f
> # bad: [d45004f9947e521fc9e812bc7937ed6e0328793b] Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
> git bisect bad d45004f9947e521fc9e812bc7937ed6e0328793b
> # bad: [9bf12df31f282e845b3dfaac1e5d5376a041da22] Merge git://git.kvack.org/~bcrl/aio-next
> git bisect bad 9bf12df31f282e845b3dfaac1e5d5376a041da22
> # bad: [26935fb06ee88f1188789807687c03041f3c70d9] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
> git bisect bad 26935fb06ee88f1188789807687c03041f3c70d9
> # bad: [5223161dc0f5e44fbf3d5e42d23697b6796cdf4e] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds
> git bisect bad 5223161dc0f5e44fbf3d5e42d23697b6796cdf4e
> # bad: [02b9735c12892e04d3e101b06e4c6d64a814f566] Merge tag 'pm+acpi-fixes-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
> git bisect bad 02b9735c12892e04d3e101b06e4c6d64a814f566
> # good: [0df03a30c333d67ee9b4c37f32d423624f48fe05] Merge branch 'pm-cpufreq'
> git bisect good 0df03a30c333d67ee9b4c37f32d423624f48fe05
> # bad: [5c5e854bc760a2e2c878df3cfcf2afa4febcd511] perf tools: Add attr->mmap2 support
> git bisect bad 5c5e854bc760a2e2c878df3cfcf2afa4febcd511
> # good: [41817815666e4a6f302dad1fea47cbe64cc45e40] perf trace: Check if MAP_32BIT is defined
> git bisect good 41817815666e4a6f302dad1fea47cbe64cc45e40
> # good: [ccf53eac2097fb47bc40875ffb22c2d10fa8c46c] perf trace: Handle perf.data files with no tracepoints
> git bisect good ccf53eac2097fb47bc40875ffb22c2d10fa8c46c
> # good: [e71aa28312b208a14cd87fa61e941ac8c85072f4] perf kvm: Fix sample_type manipulation
> git bisect good e71aa28312b208a14cd87fa61e941ac8c85072f4
> # first bad commit: [5c5e854bc760a2e2c878df3cfcf2afa4febcd511] perf tools: Add attr->mmap2 support
>
>
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