NULL dereference in clockevents_program_event

[Johannes Berg]

Hi,

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.

johannes
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