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

Alan D. Brunelle
2008-08-25T12:03:07Z

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