Re: 2.6.25-rc8-mm2: IP: [] __kmalloc+0x69/0x110

Alexey Dobriyan
2008-04-14T18:37:11Z

On Mon, Apr 14, 2008 at 10:53:12AM -0700, Christoph Lameter wrote:
> On Mon, 14 Apr 2008, Pekka Enberg wrote:
>
> > > Code: 48 89 45 d0 9c 41 5d fa e8 f5 a5 fc ff 65 8b 04 25 24 00 00 00 48 98 4c 8b bc c3 c8 00 00 00 4d 8b 27 4d 85 e4 74 7a 41 8b 47 14 <49> 8b 04 c4 49 89 07 41 f7 c5 00 02 00 00 75 37 41 55 9d e8 bf
> > > RIP [<ffffffff802868f9>] __kmalloc+0x69/0x110
> > > RSP <ffff81017cba9c68>
> > > CR2: 0000000500000500
> >
> > Looks like freelist corruption where c->freelist is 0x0000000500000500
> > and c->offset is zero... Christoph?
>
> c->offset is zero is okay. Could be a object freepointer corruption
> because the first word of the object is overwritten after free. You
> need to run with slub_debug on the commandline or CONFIG_SLUB_DEBUG_ON to
> debug this.

Doh! I forgot SLUB debugging again. Apologies and let me reproduce some more.

> Anyone know what the possible meaning of 0x0000000500000500 is? I do not
> see anything in poison.h.