Messages in this thread | | | Date | Mon, 21 May 2001 11:53:41 +1000 | From | Andrew Morton <> | Subject | Re: 2.4.4 del_timer_sync oops in schedule_timeout |
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Ingo Molnar wrote: > > On Sat, 19 May 2001, Jacob Luna Lundberg wrote: > > > This is 2.4.4 with the aic7xxx driver version 6.1.13 dropped in. > > > Unable to handle kernel paging request at virtual address 78626970 > > this appears to be some sort of DMA-corruption or other memory scribble > problem. hexa 78626970 is ASCII "pibx", which shows in the direction of > some sort of disk-related DMA corruption.
It could be timer-list corruption. Someone released some memory which had a live timer in it. The memory got recycled and then the timer list traversal fell over it.
There was a convincing report of this a few weeks back on a system which didn't have any unusual drivers in it. It was inconclusive. That system was SMP, so it could have been a timer deletion race.
This bug is so damn hard to track down that it may be worth putting some special walk-the-timer-lists code inside kfree()+SLAB_POISON.
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