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

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

[Nigel Cunningham]

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

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

[Matt Mackall]

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.

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

[Pekka Enberg]

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?

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

[Christoph Lameter]

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.

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

[Pedro Ribeiro]

2010/1/26 Pekka Enberg <penberg@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

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

[Pedro Ribeiro]

2010/1/26 Pedro Ribeiro <pedrib@gmail.com>:
> 2010/1/26 Pekka Enberg <penberg@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
>

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?

Regards,
Pedro

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

[Pekka Enberg]

Pedro Ribeiro kirjoitti:
> 2010/1/26 Pedro Ribeiro <pedrib@gmail.com>:
>> 2010/1/26 Pekka Enberg <penberg@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
>>
> 
> 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.

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

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