Eric found something like this and has a fix with in the email.
Sub: "I think "btrfs: fix leak of path in btrfs_find_item" broke stable trees ..."

Anand

On 03/24/2015 06:40 PM, Rich Freeman wrote:
On Tue, Mar 24, 2015 at 2:31 AM, Anand Jain <anand.j...@oracle.com> wrote:
Do you have this fix ..

  [PATCH] Btrfs: release path before starting transaction in can_nocow_extent

could you try ?.

I believe I already have this patch.  3.18.9 contains this:

commit bdeeab62a611f1f7cd48fd285ce568e8dcd0455a
Merge: 797afdf 1bda19e
Author: Linus Torvalds <torva...@linux-foundation.org>
Date:   Fri Oct 18 16:46:21 2013 -0700

     Merge branch 'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

     Pull btrfs fix from Chris Mason:
      "Sage hit a deadlock with ceph on btrfs, and Josef tracked it down to a
       regression in our initial rc1 pull.  When doing nocow writes we were
       sometimes starting a transaction with locks held"

     * 'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
       Btrfs: release path before starting transaction in can_nocow_extent
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