linux-kernel - Re: NULL dereference in clockevents_program

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Message-Id: <1196207540.6058.114.camel@johannes.berg>
Date:	Wed, 28 Nov 2007 00:52:20 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linuxppc-dev list <linuxppc-dev@...abs.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: NULL dereference in clockevents_program_event


> During a hibernate cycle on my G5, while machine was powering down after
> saving the image, I just had a NULL dereference  in
> clockevents_program_event when accessing dev->mode, dev was NULL.
> 
> Unfortunately the machine rebooted before I was able to write down more
> than the fact that it was called from tick_program_event(); the problem
> doesn't seem to be easily reproducible.
> 
> From what I can see when doing the same thing, the shutdown attempts to
> offline all CPUs. Because the snapshot was actually saved to disk and
> the machine was shutting down I guess that the it happened at that time,
> but I have no idea what else to do to debug this.
> 
> I have
> 
> | CONFIG_HIGH_RES_TIMERS=y
> | CONFIG_NO_HZ=y
> 
> in this config.

I just got the same or a similar thing again and was able to write down
more of the stack dump:

NIP clock_events_program_event+0x20
LR  tick_program_event+0x64
Stack:
hr_timer_interrupt+0x211
timer_interrupt+0xc4
decrementer_common+0x110

johannes

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