linux-kernel - Re: perf-4.8.0-rc3: Segmentation fault

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Date:   Tue, 30 Aug 2016 13:00:50 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        alexander.shishkin@...ux.intel.com,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: perf-4.8.0-rc3: Segmentation fault

On Mon, Aug 29, 2016 at 11:02 PM, Arnaldo Carvalho de Melo
<arnaldo.melo@...il.com> wrote:
> Em Mon, Aug 29, 2016 at 11:44:50AM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Thu, Aug 25, 2016 at 01:49:41PM +0300, Alexey Dobriyan escreveu:
>> > I profiled kernel allmodconfig build (don't ask) and perf tui reliably
>> > segfaults when trying to enter annotation mode for any of the
>> > individual functions. It segfaults immediately before even showing
>> > menu with choices.
>> >
>> > perf: Segmentation fault
>> > -------- backtrace --------
>> > perf[0x5451fb]
>> > /lib64/libc.so.6(+0x33290)[0x7fcec0a80290]
>> > perf(__map__is_kernel+0x26)[0x4bbcd6]
>> > perf[0x54287c]
>> > perf(perf_evlist__tui_browse_hists+0x94)[0x543e84]
>> > perf(cmd_report+0x1a34)[0x434884]
>> > perf[0x478471]
>> > perf(main+0x6c6)[0x4237e6]
>> > /lib64/libc.so.6(__libc_start_main+0xf0)[0x7fcec0a6d630]
>> > perf(_start+0x29)[0x4238e9]
>> >
>> > Steps to reproduce:
>> >     rm -rf ../xxx
>> >     mkdir ../xxx
>> >     make O=../xxx ARCH=x86_64 allmodconfig
>> >     perf record -e cycles make O=../xxx -k -j5
>> >     perf report
>> >
>> > perf.data is 1.23 GB long , so be prepared.
>>
>> Thanks for the report, trying to reproduce this.
>
> So, I built the kernel with my normal .config, using your command line and got:

I've lost vmlinux and can't recreate it anymore. Oh well.