Re: non-atomic xattr replacement in btrfs => rsync random errors

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On Thu, 06 Nov 2014 23:39:02 -0200, Alexandre Oliva wrote:

> [dropping rsync@xxxxxxxxxxxxxxx, it rejects posts from non-subscribers;
>  refer to https://bugzilla.samba.org/show_bug.cgi?id=10925 instead]
> 
> On Nov  6, 2014, Alexandre Oliva <oliva@xxxxxxx> wrote:
> 
>> What makes the problem visible is that btrfs appears to have a race in
>> its handling of xattr replacement, leaving a window between the removal
>> of the old value and the insertion of the new one
> 
> The bugs described above occurred with rsync-3.1.0-5.fc20.x86_64 and
> kernel-libre-3.16.7-200.fc20.gnu.x86_64.  The btrfs code in kernel-libre
> is unchanged from the corresponding Fedora kernel.  The distro is BLAG
> 200k/x86_64, under development.

Just a shot in the dark - could this be related to commit:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b0d5d10f41a0f1cd839408dd94427f2db3553bca

I don't think that made it into 3.16.x.

-h

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