linux-kernel - Re: 2.6.21-rc2-mm2 hang

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Date:	Thu, 08 Mar 2007 16:07:03 +0100
From:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Dave Hansen <hansendc@...ibm.com>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: 2.6.21-rc2-mm2 hang

Andrew Morton napisał(a):
> On Wed, 07 Mar 2007 15:07:21 -0800
> Dave Hansen <hansendc@...ibm.com> wrote:
> 
>> On Wed, 2007-03-07 at 14:16 -0800, Siddha, Suresh B wrote:
>>> On Wed, Mar 07, 2007 at 02:12:16PM -0800, Dave Hansen wrote:
>>>> I'm seeing weird hangs running ltp on 2.6.21-rc2-mm2.  It manifests
>>>> itself by the waitpid06 test in LTP hanging.  This is very, very
>>>> reproducible in about 5 seconds by adding '-s wait' to the ltp command
>>>> line.
>>>>
>>>> I see 4 waitpid06 processes on my 4-way machine spinning in userspace.
>>>> But, the weird part is that I can't ssh in once this happens, but I can
>>>> log in to the console.  I've bisected it down to:
>>>>         
>>>>         sched-fix-idle-load-balancing-in-softirqd-context
>>> This sounds like an issue in merge we recently had and 2.6.21-rc2-mm2 already
>>> has a fix for this.
>>>
>>> sched-fix-idle-load-balancing-in-softirqd-context-fix.patch  
>>>
>>> Can you please apply both
>>> sched-fix-idle-load-balancing-in-softirqd-context
>>> sched-fix-idle-load-balancing-in-softirqd-context-fix.patch
>>> and see if you still see this problem?
>> I was confused that I couldn't find this fix in my patches directory,
>> but I double-checked, and realized that I was still on 2.6.21-rc2-mm1.
>> I must have grabbed the wrong broken-out tarball when I started the
>> bisect.  Darn.
>>
>> Anyway, 2.6.21-rc2-mm2 appears to be OK.  Sorry for the false alarm.
>>
> 
> Ah, OK.  I'll undrop those three patches.
> 
> Michal, did rc2-mm2 make that weird hang go away for you?
> 

No, it works fine for me since -rc2-mm2.

Regards,
Michal

-- 
Michal K. K. Piotrowski
LTG - Linux Testers Group (PL)
(http://www.stardust.webpages.pl/ltg/)
LTG - Linux Testers Group (EN)
(http://www.stardust.webpages.pl/linux_testers_group_en/)
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