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

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Message-ID: <20070308010750.GB19790@linux-os.sc.intel.com>
Date:	Wed, 7 Mar 2007 17:07:50 -0800
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21-rc2-mm2 hang

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

[having some mailer issues. Pl ignore if this is a duplicate]

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?

thanks,
suresh
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