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

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Date:	Wed, 07 Mar 2007 15:07:21 -0800
From:	Dave Hansen <hansendc@...ibm.com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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

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.

-- Dave

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