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Date: Fri, 1 Oct 2004 17:42:38 -0700
From: Andrew Morton <akpm@osdl.org>
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.6.9-rc2-mm4 ps hang ?
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Badari Pulavarty <pbadari@us.ibm.com> wrote:
>
> Why would I be stuck in spin_unlock() ?

Maybe that's where the CPU happened to be when the interrupt came in.
That'll happen if it's looping tightly.  Try generating more sysrq
traces?