From: Yinghai Lu <yinghai@kernel.org>
To: Flavio Leitner <fbl@redhat.com>
Cc: lkml <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>,
WANG Cong <xiyou.wangcong@gmail.com>, Tejun Heo <tj@kernel.org>,
ianfang.cn@gmail.com, Andrew Morton <akpm@linux-foundation.org>
Subject: Re: kexec/kdump kernel fails to start
Date: Tue, 4 Sep 2012 12:02:00 -0700 [thread overview]
Message-ID: <CAE9FiQUEHbDySWHWFj6kW=HGLR0vkbaJWRq+7kMMHGhBm8e08A@mail.gmail.com> (raw)
In-Reply-To: <20120904143215.5bbbb2a4@obelix.rh>
On Tue, Sep 4, 2012 at 10:32 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
>
> For machines that enable PSE, the first 2/4M memory region still uses
> 4K pages, so needs more PTEs in this case, but
> find_early_table_space() doesn't count this.
>
> This patch fixes it.
>
> The bug was found via code review, no misbehavior of the kernel
> was observed.
maybe just revert the offending commit?
Thanks
Yinghai
next prev parent reply other threads:[~2012-09-04 19:02 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 17:32 kexec/kdump kernel fails to start Flavio Leitner
2012-09-04 19:02 ` Yinghai Lu [this message]
2012-09-04 19:17 ` Flavio Leitner
2012-09-04 19:20 ` Yinghai Lu
2012-09-04 20:00 ` Flavio Leitner
2012-09-04 20:26 ` Flavio Leitner
2012-09-04 20:45 ` Yinghai Lu
2012-09-04 21:37 ` Flavio Leitner
2012-09-04 22:25 ` Yinghai Lu
2012-09-04 22:40 ` Flavio Leitner
2012-09-05 0:01 ` Flavio Leitner
2012-09-05 1:15 ` Yinghai Lu
2012-09-05 13:46 ` Flavio Leitner
2012-09-05 15:34 ` Cong Wang
2012-09-23 20:27 ` Dan Carpenter
2012-09-23 20:52 ` Yinghai Lu
2012-09-29 7:13 ` Ingo Molnar
2012-10-18 2:16 ` Dave Young
2012-10-18 6:33 ` Dave Young
2012-10-18 13:57 ` Cong Wang
2012-10-18 16:27 ` Flavio Leitner
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