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Date: Sun, 23 Sep 2012 13:52:07 -0700
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Subject: Re: kexec/kdump kernel fails to start
From: Yinghai Lu <yinghai@kernel.org>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>, Flavio Leitner <fbl@redhat.com>,
        lkml <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
        Tejun Heo <tj@kernel.org>, ianfang.cn@gmail.com,
        Andrew Morton <akpm@linux-foundation.org>
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On Sun, Sep 23, 2012 at 1:27 PM, Dan Carpenter <dan.carpenter@oracle.com> wrote:
> 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?

that offending patch should be reverted...

722bc6b16771ed80871e1fd81c86d3627dda2ac8