linux-kernel - Re: User Stack Tracer Causes Crash

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Message-ID: <20190319235858.084b75b1@oasis.local.home>
Date:   Tue, 19 Mar 2019 23:58:58 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     He Zhe <zhe.he@...driver.com>
Cc:     <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
        <will.deacon@....com>, <joel@...lfernandes.org>,
        <namhyung@...nel.org>, <akpm@...ux-foundation.org>,
        <tglx@...utronix.de>, <rppt@...ux.ibm.com>,
        <linux@...inikbrodowski.net>, <adobriyan@...il.com>, <cai@....pw>,
        <ard.biesheuvel@...aro.org>, <axboe@...nel.dk>,
        <linux-kernel@...r.kernel.org>
Subject: Re: User Stack Tracer Causes Crash

On Wed, 20 Mar 2019 11:15:10 +0800
He Zhe <zhe.he@...driver.com> wrote:

> Hi,
> 
> User stack tracer causes crash and hang since the following commit till now(5.1-rc1).
> 
> c3bc8fd637a9 ("tracing: Centralize preemptirq tracepoints and unify their usage")

Can you send me your .config.

-- Steve

> 
> echo 1 > /proc/sys/kernel/stack_tracer_enabled
> echo userstacktrace > /sys/kernel/debug/tracing/trace_options
> echo 1 > /sys/kernel/debug/tracing/events/enable
> dmesg
>