linux-kernel - Re: HPET (?) related hangs and breakage in 2.6.35,36

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Date:	Tue, 9 Nov 2010 16:38:05 +0100
From:	Borislav Petkov <bp@...64.org>
To:	Clemens Ladisch <clemens@...isch.de>
CC:	Andrew Lutomirski <luto@....edu>, <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	x86 <x86@...nel.org>
Subject: Re: HPET (?) related hangs and breakage in 2.6.35,36

On Tue, Nov 09, 2010 at 04:20:56PM +0100, Clemens Ladisch wrote:
> Andrew Lutomirski wrote:
> > After several minutes of uptime, my system freezes in a strange way.
> > All of userspace and some kernel services freeze hard (no mouse, no
> > typing, etc.)  Caps-lock works intermittently, as does (I think)
> > pinging.  The only debug output I've been able to get is this (typed
> > from a blurry photo because netconsole dies along with everything
> > else):
> > 
> > [ 5478.244722] Clocksource tsc unstable (delta = 101399051316 ns)
> > [ 5478.367958] Switching to clocksource hpet
> > [ 5543.729698] BUG: soft lockup - CPU #1 stuck for 61s! [migration/1:6]
> 
> Looks like this one:
> http://lkml.org/lkml/2010/10/26/126

I don't think so: the one at the URL above is 37-rc1 specific (issue
came in during the merge window) while Andrew's problem can be
reproduced with 35 and 36, reportedly.

Anyway, adding more people to Cc.

-- 
Regards/Gruss,
Boris.

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