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SubjectRe: blk: NULL ptr deref in blk_dequeue_request()
On 10/09/2012 09:21 AM, Sasha Levin wrote:
> On 10/08/2012 05:45 PM, Jiri Kosina wrote:
>> On Mon, 8 Oct 2012, Jan Kara wrote:
>>
>>>>>> I'm still seeing this on linux-next.
>>>> I think this is floppy related (see redo_fd_request() in the stack
>>>> trace). And there were quite some changes to the area recently. Adding
>>>> maintainer to CC.
>> Hmm ... I don't immediately see how this is happening.
>>
>> Sasha, could you please do git bisect on drivers/block/floppy.c between
>> f6365201d and your git HEAD for starters (assuming that f6365201d works
>> well for you?).
>>
>
> A bisect on floppy.c yielded the following:
>
> b33d002f4b6bae912463e5a66387c498aa69b6fe is the first bad commit
> commit b33d002f4b6bae912463e5a66387c498aa69b6fe
> Author: Ben Hutchings <ben@decadent.org.uk>
> Date: Mon Aug 27 20:56:53 2012 -0300
>
> genhd: Make put_disk() safe for disks that have not been registered

2 more things:

1. The guest vm which I'm testing on doesn't emulate anything which even looks like a floppy.
2. I'm seeing the following lines before the BUG:

[ 9.836604] floppy0: no floppy controllers found
[ 9.837246] work still pending
[ 9.837743] floppy0: floppy_shutdown: timeout handler died.


Thanks,
Sasha


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