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Date: Sun, 23 Sep 2012 23:27:27 +0300
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Flavio Leitner <fbl@redhat.com>, lkml <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@elte.hu>, Yinghai Lu <yinghai@kernel.org>,
        Tejun Heo <tj@kernel.org>, ianfang.cn@gmail.com,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: kexec/kdump kernel fails to start
Message-ID: <20120923202727.GA28937@mwanda>
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 <CAM_iQpVVCjJ0Bde9RS9Rm-0RJ=CtTyX3eUH45+oaaepvdAvAmQ@mail.gmail.com>
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On Wed, Sep 05, 2012 at 11:34:25PM +0800, Cong Wang wrote:
> On Wed, Sep 5, 2012 at 1:32 AM, Flavio Leitner <fbl@redhat.com> wrote:
> > Hi folks,
> >
> > I have system that no longer boots kdump kernel. Basically,
> >
> > # echo c > /proc/sysrq-trigger
> >
> > to dump a vmcore doesn't work. It just hangs after showing the usual
> > panic messages. I've bisected the problem and the commit introducing
> > the issue is the one below.
> >
> > Any idea?
> >
> > commit 722bc6b16771ed80871e1fd81c86d3627dda2ac8
> > Author: WANG Cong <xiyou.wangcong@gmail.com>  2012-03-05 20:05:13
> > Committer: Ingo Molnar <mingo@elte.hu>  2012-03-06 05:38:26
> > Parent: 550cf00dbc8ee402bef71628cb71246493dd4500 (Merge tag 'mmc-fixes-for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc)
> > Child:  a6fca40f1d7f3e232c9de27c1cebbb9f787fbc4f (x86, tlb: Switch cr3 in leave_mm() only when needed)
> > Branches: master, remotes/origin/master
> > Follows: v3.3-rc6
> > Precedes: v3.5-rc1
> >
> >     x86/mm: Fix the size calculation of mapping tables
> 
> There was some attempt to fix this:
> https://patchwork.kernel.org/patch/1195751/
> 
> but for some reason it is not accepted.

I filed a bug for this:
https://bugzilla.kernel.org/show_bug.cgi?id=47881

Is it fixed now?

regards,
dan carpenter