linux-kernel - Re: 4.4rc3 nfsd/btrfs kasan warning.

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Message-ID: <CAPAsAGyB578shW36WcpwdTLA0-uwpa574fH4ZDfYPzeQ=f9zPw@mail.gmail.com>
Date:	Wed, 2 Dec 2015 21:32:34 +0300
From:	Andrey Ryabinin <ryabinin.a.a@...il.com>
To:	Chris Mason <clm@...com>, Dave Jones <davej@...emonkey.org.uk>,
	Josef Bacik <jbacik@...com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	David Sterba <dsterba@...e.com>, conchur@....de
Subject: Re: 4.4rc3 nfsd/btrfs kasan warning.

2015-12-02 20:14 GMT+03:00 Chris Mason <clm@...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@...pp-webde-bs56>
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