linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <CA+55aFxSRujj=cM1NkXYvxmo=Y1hb1e3tgLhdh1JDphzV6WKRw@mail.gmail.com>
Date:	Tue, 25 Nov 2014 09:22:04 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jürgen Groß <jgross@...e.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Josh Boyer <jwboyer@...oraproject.org>,
	Andy Lutomirski <luto@...capital.net>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tejun Heo <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Don Zickus <dzickus@...hat.com>, Dave Jones <davej@...hat.com>,
	"the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: frequent lockups in 3.18rc4

On Mon, Nov 24, 2014 at 9:36 PM, Jürgen Groß <jgross@...e.com> wrote:
>
> Funny, during testing some patches related to Xen I hit the lockup
> issue. It looked a little bit different, but a variation of your patch
> solved my problem.
>
> I could reproduce the issue within a few minutes reliably without the
> patch below. With it the machine survived 12 hours and is still running.

Do you have a backtrace for the failure case? I have no problem
applying this part of the patch (I really don't understand why x86-64
hadn't gotten the proper code from 32-bit), but I'd like to see (and
document) where the fault happens for this.

Since you can apparently reproduce this fairly easily with a broken
kernel, getting a backtrace shouldn't be too hard?

                     Linus
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