Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c - bisected

[Alan D. Brunelle]

Linus Torvalds wrote:
> 
> On Sat, 23 Aug 2008, Linus Torvalds wrote:
>> This one makes no sense. It's triggering a BUG_ON(in_interrupt()), but 
>> then the call chain shows that there is no interrupt going on.
> 
> Ahh, later in that thread there's another totally unrelated oops in 
> debug_mutex_add_waiter().
> 
> I'd guess that it is really wild pointer corrupting memory, quite possibly 
> due to a double free or something like that. Alan - it would be good to 
> run with DEBUG_PAGE_ALLOC and SLUB debugging etc if you don't already do 
> that?
> 
> 		Linus
> 

I'll add those in - as to the repeatability: The "bad" kernels seem to
repeat quite reliably - not only in terms of counts (5 or 6 times in a
row before trying something else), but also in terms of the "what" -
either the original issue () or the other kernel with the later issue
(debug_mutex_add_waiter). That's /goodness/ in that it should help
narrow it down.

I'll make sure the kernel is still failing this morning, and then add in
DEBUG_PAGE_ALLOC and if that doesn't help, SLUB debugging...

Alan
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