linux-kernel - Re: BUG: crashkernel does not boot upon crash from sysrq-trigger

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Message-ID: <20131216175651.GA5048@cpaasch-mac>
Date:	Mon, 16 Dec 2013 18:56:51 +0100
From:	Christoph Paasch <christoph.paasch@...ouvain.be>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>,
	Yinghai Lu <yinghai@...nel.org>, Tejun Heo <tj@...nel.org>,
	Ian Fang <ianfang.cn@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: BUG: crashkernel does not boot upon crash from sysrq-trigger

On 16/12/13 - 09:36:52, Cong Wang wrote:
> On Mon, Dec 16, 2013 at 3:35 AM, Christoph Paasch
> <christoph.paasch@...ouvain.be> wrote:
> > Hello,
> >
> > since 3.5, my crashkernel does not boot anymore when triggering an oops with
> > /proc/sysrq-trigger on my HP Elitebook 8540p.
> >
> > I bisected it down to 722bc6b16771ed8 (x86/mm: Fix the size calculation of
> > mapping tables).
> >
> 
> It has been reverted in upstream.

Oh, then something else is causing my bug again, because I tried v3.13-rc3
to see if it has been fixed upstream. And, my Ubuntu runs on v3.11, where
the crashkernel does not work either.

My bisect ended up on 722bc6b16771ed8 because I started bisecting between v3.2
(good) and v3.5 (bad).

So, then I will make again a bisect between v3.7 and v3.11.


Thanks,
Christoph
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