linux-kernel - Re: [PATCH 01/18] tracing: Add function based events

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Message-ID: <20180205100050.75c04497@gandalf.local.home>
Date:   Mon, 5 Feb 2018 10:00:50 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        linux-rt-users@...r.kernel.org, linux-trace-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Clark Williams <williams@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: Re: [PATCH 01/18] tracing: Add function based events

On Mon, 5 Feb 2018 09:24:23 +0100
Jiri Olsa <jolsa@...hat.com> wrote:


> should this be done under 'func_event_mutex' ?

Probably.

> 
> I tried and crashed the system by running 2 scripts with:
> 
>   echo 'ip_rcv(u64 skb, u64 dev)' > /sys/kernel/debug/tracing/function_events
>   echo 'SyS_openat(int dfd, string buf, x32 flags, x32 mode)' >> /sys/kernel/debug/tracing/function_events
>   echo 'SyS_open(x8[32] buf, x32 flags, x32 mode)' >> /sys/kernel/debug/tracing/function_events
>

Thanks for testing. I'll fix.

-- Steve