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Re: 4.4rc3 nfsd/btrfs kasan warning.

From Andrey Ryabinin <ryabinin.a.a@gmail.com>
Newsgroups linux.kernel
Subject Re: 4.4rc3 nfsd/btrfs kasan warning.
Date 2015-12-02 19:40 +0100
Message-ID <qBktP-2ty-13@gated-at.bofh.it> (permalink)
References <qBh2W-8un-21@gated-at.bofh.it> <qBhmh-sK-11@gated-at.bofh.it> <qBiin-161-33@gated-at.bofh.it> <qBjes-1JE-61@gated-at.bofh.it>
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2015-12-02 20:14 GMT+03:00 Chris Mason <clm@fb.com>:
> On Wed, Dec 02, 2015 at 11:09:43AM -0500, Dave Jones wrote:
>> On Wed, Dec 02, 2015 at 10:11:28AM -0500, Josef Bacik wrote:
>>  > On 12/02/2015 09:59 AM, Dave Jones wrote:
>>  > > Got a few of these in the logs this morning after an overnight rsync over nfs
>>  > > to an exported btrfs volume.
>>  >
>>  > That's probably us and not NFS, what line is that in
>>  > setup_cluster_bitmap?  Thanks,
>>
>> If my math is correct, it's this..
>>
>>         if (entry->offset != bitmap_offset)
>>
>> I don't seem to be able to trigger it on demand unfortunatly.
>
> Is it possible we're blowing the stack?  It seems pretty tricky to get a
> stack out of bounds out of this code without flat out blowing through
> it.
>

I think it just empty bitmaps list.
 list_first_entry() can't be used on empty list.

BTW, there is similar report
http://lkml.kernel.org/r/<trinity-c7a088d8-bb35-484e-bf27-dbd9a94a804c-1448959367092@3capp-webde-bs56>
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Thread

4.4rc3 nfsd/btrfs kasan warning. Dave Jones <davej@codemonkey.org.uk> - 2015-12-02 16:00 +0100
  Re: 4.4rc3 nfsd/btrfs kasan warning. Josef Bacik <jbacik@fb.com> - 2015-12-02 16:20 +0100
    Re: 4.4rc3 nfsd/btrfs kasan warning. Dave Jones <davej@codemonkey.org.uk> - 2015-12-02 17:20 +0100
      Re: 4.4rc3 nfsd/btrfs kasan warning. Chris Mason <clm@fb.com> - 2015-12-02 18:20 +0100
        Re: 4.4rc3 nfsd/btrfs kasan warning. Dave Jones <davej@codemonkey.org.uk> - 2015-12-02 18:40 +0100
        Re: 4.4rc3 nfsd/btrfs kasan warning. Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2015-12-02 19:40 +0100
          Re: 4.4rc3 nfsd/btrfs kasan warning. Chris Mason <clm@fb.com> - 2015-12-02 20:10 +0100

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