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Date: Tue, 18 Mar 2003 18:59:35 -0800
From: Andrew Morton <akpm@digeo.com>
To: george anzinger <george@mvista.com>
Cc: tim@physik3.uni-rostock.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] fix nanosleep() granularity bumps
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george anzinger <george@mvista.com> wrote:
>
> > There is currently a mysterious timer lockup happening on power4 machines. 
> > I'd like to keep these changes well-separated in time so we can get an
> > understanding of what code changes correlate with changed behaviour.
> 
> Tell me more...

Don't know much more really.  Anton has a machine which fairly repeatably
locks up at jiffies = 0x100104100.

> Latest BK. Ive been getting this lockup for a while,
> It _always_ triggers when jiffies = 0x100104100.
> 
> c000000000068a14 cascade+0x74
> c0000000000694a4 run_timer_softirq+0x244
> c0000000000614f0 do_softirq+0x174
> c000000000012c10 timer_interrupt+0x1a8
> c000000000012a0c cpu_idle+0xc0

This _might_ be the timer-handler-does-add_timer(right now) lockup which was
fixed in Linus's tree today.
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