On 09/22/2016 10:03 AM, Ronan Arraes Jardim Chagas wrote:
Em qui, 2016-09-22 às 09:41 -0400, Austin S. Hemmelgarn escreveu:
Most likely the kernel upgrade fixed things.  It's possible that the
large allocation is impacting something and making it work, but I
don't
think that that is very likely.


The patches related to btrfs I could find in kernel 4.7.2 and 4.7.3
changelog are:

commit 8d32aaa89067225d4202a362dc201280e2514952
Author: Chris Mason <c...@fb.com>
Date:   Tue Jul 19 05:52:36 2016 -0700

    Btrfs: fix delalloc accounting after copy_from_user faults

This is what fixed it. I thought it was in 4.7 which is why I started paying attention, but I guess I was wrong. Glad your problem is resolved. Thanks,

Josef
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