Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss

BUG at mm/slab.c:2990 with 2.6.33-rc5-tuxonice

8 views
Skip to first unread message

Pedro Ribeiro

unread,
Jan 26, 2010, 2:30:03 PM1/26/10
to
Hi,

I hit a bug at mm/slab.c:2990 with .33-rc5.
Unfortunately nothing more is available than a screen picture with a
crash dump, although it is a good one.
The bug was hit almost at the end of a hibernation cycle with
Tux-on-Ice, while saving memory contents to an encrypted swap
partition.

The image is here http://img264.imageshack.us/img264/9634/mmslab.jpg (150 kb)

Hopefully it is of any use for you. Please let me know if you need any
more info.

Regards,
Pedro
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majo...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

Nigel Cunningham

unread,
Jan 26, 2010, 3:40:02 PM1/26/10
to
Hi.

Pedro Ribeiro wrote:
> Hi,
>
> I hit a bug at mm/slab.c:2990 with .33-rc5.
> Unfortunately nothing more is available than a screen picture with a
> crash dump, although it is a good one.
> The bug was hit almost at the end of a hibernation cycle with
> Tux-on-Ice, while saving memory contents to an encrypted swap
> partition.
>
> The image is here http://img264.imageshack.us/img264/9634/mmslab.jpg (150 kb)
>
> Hopefully it is of any use for you. Please let me know if you need any
> more info.

Looks to me to be completely unrelated to TuxOnIce - at least at a first
glance.

Ccing the slab allocator maintainers listed in MAINTAINERS.

Regards,

Nigel

Matt Mackall

unread,
Jan 26, 2010, 4:00:02 PM1/26/10
to
On Wed, 2010-01-27 at 07:39 +1100, Nigel Cunningham wrote:
> Hi.
>
> Pedro Ribeiro wrote:
> > Hi,
> >
> > I hit a bug at mm/slab.c:2990 with .33-rc5.
> > Unfortunately nothing more is available than a screen picture with a
> > crash dump, although it is a good one.
> > The bug was hit almost at the end of a hibernation cycle with
> > Tux-on-Ice, while saving memory contents to an encrypted swap
> > partition.
> >
> > The image is here http://img264.imageshack.us/img264/9634/mmslab.jpg (150 kb)
> >
> > Hopefully it is of any use for you. Please let me know if you need any
> > more info.
>
> Looks to me to be completely unrelated to TuxOnIce - at least at a first
> glance.
>
> Ccing the slab allocator maintainers listed in MAINTAINERS.

Not sure if this will do us any good, it's the second oops.

--
http://selenic.com : development and support for Mercurial and Linux

Pekka Enberg

unread,
Jan 26, 2010, 4:00:02 PM1/26/10
to
Matt Mackall wrote:
> On Wed, 2010-01-27 at 07:39 +1100, Nigel Cunningham wrote:
>> Hi.
>>
>> Pedro Ribeiro wrote:
>>> Hi,
>>>
>>> I hit a bug at mm/slab.c:2990 with .33-rc5.
>>> Unfortunately nothing more is available than a screen picture with a
>>> crash dump, although it is a good one.
>>> The bug was hit almost at the end of a hibernation cycle with
>>> Tux-on-Ice, while saving memory contents to an encrypted swap
>>> partition.
>>>
>>> The image is here http://img264.imageshack.us/img264/9634/mmslab.jpg (150 kb)
>>>
>>> Hopefully it is of any use for you. Please let me know if you need any
>>> more info.
>> Looks to me to be completely unrelated to TuxOnIce - at least at a first
>> glance.
>>
>> Ccing the slab allocator maintainers listed in MAINTAINERS.
>
> Not sure if this will do us any good, it's the second oops.

Looks like slab corruption to me which is usually not a slab bug but
caused by buggy callers. Is CONFIG_DEBUG_SLAB enabled?

Christoph Lameter

unread,
Jan 26, 2010, 4:40:02 PM1/26/10
to
On Tue, 26 Jan 2010, Pekka Enberg wrote:

> Looks like slab corruption to me which is usually not a slab bug but caused by
> buggy callers. Is CONFIG_DEBUG_SLAB enabled?

Typical BUG for slab metadata that has been overwritten by
something.

Pedro Ribeiro

unread,
Jan 26, 2010, 5:00:02 PM1/26/10
to
2010/1/26 Pekka Enberg <pen...@cs.helsinki.fi>:

> Matt Mackall wrote:
>>
>> On Wed, 2010-01-27 at 07:39 +1100, Nigel Cunningham wrote:
>>>
>>> Hi.
>>>
>>> Pedro Ribeiro wrote:
>>>>
>>>> Hi,
>>>>
>>>> I hit a bug at mm/slab.c:2990 with .33-rc5.
>>>> Unfortunately nothing more is available than a screen picture with a
>>>> crash dump, although it is a good one.
>>>> The bug was hit almost at the end of a hibernation cycle with
>>>> Tux-on-Ice, while saving memory contents to an encrypted swap
>>>> partition.
>>>>
>>>> The image is here http://img264.imageshack.us/img264/9634/mmslab.jpg
>>>> (150 kb)
>>>>
>>>> Hopefully it is of any use for you. Please let me know if you need any
>>>> more info.
>>>
>>> Looks to me to be completely unrelated to TuxOnIce - at least at a first
>>> glance.
>>>
>>> Ccing the slab allocator maintainers listed in MAINTAINERS.
>>
>> Not sure if this will do us any good, it's the second oops.
>
> Looks like slab corruption to me which is usually not a slab bug but caused
> by buggy callers. Is CONFIG_DEBUG_SLAB enabled?
>

I have enabled it and compiled the kernel. As soon as I hit the bug, I
will send a photo here.

Regards,
Pedro

Pedro Ribeiro

unread,
Jan 26, 2010, 6:40:01 PM1/26/10
to
2010/1/26 Pedro Ribeiro <ped...@gmail.com>:

The pic is here.
http://img43.imageshack.us/img43/3644/dsc01061ko.jpg

There was a buttload of output before that, which I tried capturing in
video, but its too crappy to post.
Do you know if/where I can get patches for KDB in .33?

Pekka Enberg

unread,
Jan 27, 2010, 3:10:01 AM1/27/10
to
Pedro Ribeiro kirjoitti:

Can you try passing "pause_on_oops=15" as kernel parameter? It should
delay the next oops for 15 seconds so there's enough time to take a
picture of the first one?

Also, you could try CONFIG_SLUB and passing "slub_debug" as kernel
parameter to get nicer diagnostics of the bug.

> Do you know if/where I can get patches for KDB in .33?

Nope, sorry.

Pekka

0 new messages