On Fri, Sep 08, 2017 at 05:48:55PM +0900, Naohiro Aota wrote:
> btrfs_cmp_data_prepare() (almost) always returns 0 i.e. ignoring errors
> from gather_extent_pages(). While the pages are freed by
> btrfs_cmp_data_free(), cmp->num_pages still has > 0. Then,
> btrfs_extent_same() try to access the already freed pages causing faults
> (or violates PageLocked assertion).
>
> This patch just return the error as is so that the caller stop the process.
>
> Signed-off-by: Naohiro Aota <naohiro.a...@wdc.com>
> Fixes: f441460202cb ("btrfs: fix deadlock with extent-same and readpage")
> Cc: <sta...@vger.kernel.org> # 4.2
Reviewed-by: David Sterba <dste...@suse.com>
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