linux-kernel - Re: [PATCH 16/35] perf annotate: Add samples into struct annotation

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Date:   Mon, 13 Nov 2017 21:14:38 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 16/35] perf annotate: Add samples into struct
 annotation_line

On Mon, Nov 13, 2017 at 09:16:20PM +0530, Ravi Bangoria wrote:
> Hi Jiri,
> 
> This patch seems to be causing segfault with "perf top --stdio".
> 
> Steps to reproduce:
> 1. start "perf top --stdio" in one terminal
> 2. run some simple workload in another terminal, let it get finished.
> 3. annotate function from previous workload in perf top (press 'a' followed
> by 's')
> 
> Perf will crash with:
> 
>   perf: Segmentation fault
>   Obtained 8 stack frames.
>   ./perf(sighandler_dump_stack+0x3e) [0x4f1b6e]
>   /lib64/libc.so.6(+0x36a7f) [0x7ff3aa7e4a7f]
>   ./perf() [0x4a27fd]
>   ./perf(symbol__annotate+0x199) [0x4a4439]
>   ./perf() [0x44e32d]
>   ./perf() [0x44f098]
>   /lib64/libpthread.so.0(+0x736c) [0x7ff3acee836c]
>   /lib64/libc.so.6(clone+0x3e) [0x7ff3aa8bee1e]
> 
> Can you please check.

hum, I'm getting following crash after resizing the terminal window:

perf: Floating point exception
Obtained 8 stack frames.
./perf(dump_stack+0x2e) [0x510c89]
./perf(sighandler_dump_stack+0x2e) [0x510d69]
/lib64/libc.so.6(+0x36a80) [0x7f9419588a80]
./perf(perf_top__header_snprintf+0x208) [0x4f42c1]
./perf() [0x453c09]
./perf() [0x454ddb]
/lib64/libpthread.so.0(+0x736d) [0x7f941bc8c36d]
/lib64/libc.so.6(clone+0x3f) [0x7f9419662e1f]
Floating point exception (core dumped)

working on fix

jirka