linux-kernel - Re: 3.13 hangs when I tried to start a KVM at a 32 bit stable Gentoo

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Message-ID: <530BADE9.9020101@gmx.de>
Date:	Mon, 24 Feb 2014 21:39:05 +0100
From:	Toralf Förster <toralf.foerster@....de>
To:	Dave Hansen <dave.hansen@...el.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
CC:	kernel@...too.org, kvm@...r.kernel.org,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: 3.13 hangs when I tried to start a KVM at a 32 bit stable Gentoo

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On 01/23/2014 07:55 PM, Dave Hansen wrote:
> On 01/21/2014 08:38 AM, Toralf Förster wrote:
>> Jan 21 17:18:57 n22 kernel: INFO: rcu_sched self-detected stall on CPU { 2}  (t=60001 jiffies g=18494 c=18493 q=183951)
>> Jan 21 17:18:57 n22 kernel: sending NMI to all CPUs:
>> Jan 21 17:18:57 n22 kernel: NMI backtrace for cpu 2
>> Jan 21 17:18:57 n22 kernel: CPU: 2 PID: 6779 Comm: qemu-system-x86 Not tainted 3.13.0 #3
>> Jan 21 17:18:57 n22 kernel: Hardware name: LENOVO 4180F65/4180F65, BIOS 83ET75WW (1.45 ) 05/10/2013
>> Jan 21 17:18:57 n22 kernel: task: e921c370 ti: e5f36000 task.ti: e5f36000
> 
> I'm seeing a very similar hang with an ubuntu guest and a custom kernel.
>  I'm on commit 0dc3fd0249a, and it's 100% reproducible every time I run KVM.
> 
> Cc-ing a few more folks...
> 

I tried to bisect it - the first attempt to bisetc it between v3.12. and v3.13 blamed this commit :

commit 37bf06375c90a42fe07b9bebdb07bc316ae5a0ce
Merge: 6bfa687 d0e639c
Author: Ingo Molnar <mingo@...nel.org>
Date:   Wed Oct 9 12:36:13 2013 +0200

    Merge tag 'v3.12-rc4' into sched/core

    Merge Linux v3.12-rc4 to fix a conflict and also to refresh the tree
    before applying more scheduler patches.

    Conflicts:
        arch/avr32/include/asm/Kbuild

    Signed-off-by: Ingo Molnar <mingo@...nel.org>


which seems rather to be the upper limit where to search for the first bad commit, or ?



- -- 
MfG/Sincerely
Toralf Förster
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