2.6.34-rc1: kernel BUG at mm/slab.c:2989!

2.6.34-rc1: kernel BUG at mm/slab.c:2989!

[Américo Wang]

Hello, mm experts,

I triggered an mm bug today, the full backtrace is here:

http://pastebin.ca/1831436

I am using yesterday's Linus tree.

It's not easy to reproduce this, I got this very randomly.

Some related config's are:

CONFIG_SLAB=y
CONFIG_SLABINFO=y
# CONFIG_DEBUG_SLAB is not set

Please let me know if you need more info.

Thanks.

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Re: 2.6.34-rc1: kernel BUG at mm/slab.c:2989!

[Pekka Enberg]

AmA(C)rico Wang kirjoitti:
> Hello, mm experts,
> 
> I triggered an mm bug today, the full backtrace is here:
> 
> http://pastebin.ca/1831436
> 
> I am using yesterday's Linus tree.
> 
> It's not easy to reproduce this, I got this very randomly.
> 
> Some related config's are:
> 
> CONFIG_SLAB=y
> CONFIG_SLABINFO=y
> # CONFIG_DEBUG_SLAB is not set
> 
> Please let me know if you need more info.

Looks like regular SLAB corruption bug to me. Can you trigget it with SLUB?

Anyway, it seems very unlikely that it's caused by the SLAB changes in 
-rc1 so I'm CC'ing scheduler and fs folks in case the oops rings a bell.

			Pekka

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Re: 2.6.34-rc1: kernel BUG at mm/slab.c:2989!

[Christoph Lameter]

On Wed, 10 Mar 2010, Pekka Enberg wrote:

> > Please let me know if you need more info.
>
> Looks like regular SLAB corruption bug to me. Can you trigget it with SLUB?

Run SLUB with CONFIG_SLUB_DEBUG_ON or specify slub_debug on the kernel
command line to have all allocations checked.

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Re: 2.6.34-rc1: kernel BUG at mm/slab.c:2989!

[Américo Wang]

On Wed, Mar 10, 2010 at 10:33 PM, Christoph Lameter
<cl@linux-foundation.org> wrote:
> On Wed, 10 Mar 2010, Pekka Enberg wrote:
>
>> > Please let me know if you need more info.
>>
>> Looks like regular SLAB corruption bug to me. Can you trigget it with SLUB?
>
> Run SLUB with CONFIG_SLUB_DEBUG_ON or specify slub_debug on the kernel
> command line to have all allocations checked.
>
>

Ok, I will try it today.

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Re: 2.6.34-rc1: kernel BUG at mm/slab.c:2989!

[Américo Wang]

On Thu, Mar 11, 2010 at 10:42 AM, Américo Wang <xiyou.wangcong@gmail.com> wrote:
> On Wed, Mar 10, 2010 at 10:33 PM, Christoph Lameter
> <cl@linux-foundation.org> wrote:
>> On Wed, 10 Mar 2010, Pekka Enberg wrote:
>>
>>> > Please let me know if you need more info.
>>>
>>> Looks like regular SLAB corruption bug to me. Can you trigget it with SLUB?
>>
>> Run SLUB with CONFIG_SLUB_DEBUG_ON or specify slub_debug on the kernel
>> command line to have all allocations checked.
>>
>>
>
> Ok, I will try it today.
>

Sorry, I can't trigger it today, either with SLAB or SLUB.

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Re: 2.6.34-rc1: kernel BUG at mm/slab.c:2989!

[Pekka Enberg]

AmA(C)rico Wang kirjoitti:
> On Thu, Mar 11, 2010 at 10:42 AM, AmA(C)rico Wang <xiyou.wangcong@gmail.com> wrote:
>> On Wed, Mar 10, 2010 at 10:33 PM, Christoph Lameter
>> <cl@linux-foundation.org> wrote:
>>> On Wed, 10 Mar 2010, Pekka Enberg wrote:
>>>
>>>>> Please let me know if you need more info.
>>>> Looks like regular SLAB corruption bug to me. Can you trigget it with SLUB?
>>> Run SLUB with CONFIG_SLUB_DEBUG_ON or specify slub_debug on the kernel
>>> command line to have all allocations checked.
>>>
>>>
>> Ok, I will try it today.
> 
> Sorry, I can't trigger it today, either with SLAB or SLUB.

Is it the exact same version or is it a new git snapshot?

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Re: 2.6.34-rc1: kernel BUG at mm/slab.c:2989!

[Américo Wang]

On Thu, Mar 11, 2010 at 12:49:36PM +0200, Pekka Enberg wrote:
> AmA(C)rico Wang kirjoitti:
>> On Thu, Mar 11, 2010 at 10:42 AM, AmA(C)rico Wang <xiyou.wangcong@gmail.com> wrote:
>>> On Wed, Mar 10, 2010 at 10:33 PM, Christoph Lameter
>>> <cl@linux-foundation.org> wrote:
>>>> On Wed, 10 Mar 2010, Pekka Enberg wrote:
>>>>
>>>>>> Please let me know if you need more info.
>>>>> Looks like regular SLAB corruption bug to me. Can you trigget it with SLUB?
>>>> Run SLUB with CONFIG_SLUB_DEBUG_ON or specify slub_debug on the kernel
>>>> command line to have all allocations checked.
>>>>
>>>>
>>> Ok, I will try it today.
>>
>> Sorry, I can't trigger it today, either with SLAB or SLUB.
>
> Is it the exact same version or is it a new git snapshot?

No, I did a git pull, but it looks like only some btrfs updates...

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