linux-kernel - Re: smp_call_function

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Message-ID: <CA+55aFwkcsWQAHOh-xjArGBvoBdD=_WFV4ANJjdzO_dOu5WBXw@mail.gmail.com>
Date:	Thu, 19 Feb 2015 08:14:46 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Rafael David Tinoco <inaddy@...ntu.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jens Axboe <axboe@...nel.dk>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Gema Gomez <gema.gomez-solano@...onical.com>,
	chris.j.arges@...onical.com
Subject: Re: smp_call_function_single lockups

On Thu, Feb 19, 2015 at 7:42 AM, Rafael David Tinoco <inaddy@...ntu.com> wrote:
>
> Just a quick feedback, We were able to reproduce the lockup with this
> proposed patch (3.19 + patch). Unfortunately we had problems with the
> core file and I have only the stack trace for now but I think we are
> able to reproduce it again and provide more details (sorry for the
> delay... after a reboot it took some days for us to reproduce this
> again).
>
> It looks like RIP is still smp_call_function_single.

Hmm. Still just the stack trace for the CPU that is blocked (CPU0), if
you can get the core-file to work and figure out where the other CPU
is, that would be good.

                        Linus
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