On 06/15/2011 11:03 AM, Christoph Lameter wrote:
> On Wed, 15 Jun 2011, Rik van Riel wrote:
>
>> Hi Christoph,
>>
>> last night I got an interesting backtrace running 3.0-rc3
>> (Fedora Rawhide kernel package).  Unfortunately netconsole
>> seems to be incompatible with KVM at the moment, so I had
>> to capture the oops on my digital camera and will be
>> transcribing just the backtrace.
>>
>> Essentially, kernel 3.0-rc3 hit this bug:
>>
>> static int check_slab(struct kmem_cache *s, struct page *page)
>> {
>>          int maxobj;
>>
>>          VM_BUG_ON(!irqs_disabled());
>>
>> The call trace:
>>
>> check_slab
>> alloc_debug_processing
>> __slab_alloc
>> kmem_cache_alloc
>> bvec_alloc_bs
>> bio_alloc_bioset
>> bio_alloc
>> mpage_alloc
>> do_mpage_readpage
>> ... followed by ext4 and VFS code, obviously innocent
>
> __slab_alloc() disables interrupts so alloc_debug_processing() should not
> run into this issue.
>
> There are no additional special slub patches applied right? Because some
> of the patches under discussion change the interrupt disable handling a
> bit.

Just the two attached ones, which don't seem to touch the
code path in question...

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