linux-kernel - Re: Php-fpm will crash when perf runs with call graph option

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Date:   Wed, 10 Jan 2018 16:21:49 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     禹舟键 <ufo19890607@...il.com>
Cc:     Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>, David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Milian Wolff <milian.wolff@...b.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Wind Yu <yuzhoujian@...ichuxing.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Wang Nan <wangnan0@...wei.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        acme@...hat.com
Subject: Re: Php-fpm will crash when perf runs with call graph option

On Tue, Dec 26, 2017 at 10:29:34AM +0800, 禹舟键 wrote:
> Hi, Jirka
> This issue happens  always. The perf is running on the host machine and the
> command line is as follow:
> 
>          $perf record -ag -F 100
> 
> But I do not find anything about race condition from the call stack in gdb.
> The only thing I find is that some functions' rbp is really strange(0x1,
> 0x31).
> 
> There is a simple method to reproduce this issue. Just run a docker in a
> server(OS : centos7.3), and run php-fpm(php-7.0.6)  in the docker, then run
> some shell scripts from another server to send data package to the php-fpm
> in the docker. When perf runs on the server which contains the docker, the
> php-fpm will crash in just several seconds.

could you provide exact steps/commands for this?

thanks,
jirka