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

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Message-ID: <48B2A91F.8000302@hp.com>
Date:	Mon, 25 Aug 2008 08:44:15 -0400
From:	"Alan D. Brunelle" <Alan.Brunelle@...com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c - bisected

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?

With /just/ DEBUG_PAGE_ALLOC defined, I have seen two general panic types:

o  A new double fault w/ SMP_DEBUG_PAGEALLOC problem (prob4.txt)

o  The NULL pointer dereference @ 0x858 (prob4a.txt)

Enabling SLUB debugging to see what that shows

Alan

View attachment "prob4.txt" of type "text/plain" (4170 bytes)

View attachment "prob4a.txt" of type "text/plain" (21643 bytes)