Upstream commit 38e3eebff643 ("btrfs: honor path->skip_locking in
backref code") was incorrectly backported to 4.14.y . It misses removal
of two lines from original commit, what cause deadlock.Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=203993 Reported-by: Olivier Mazouffre <olivier.mazouf...@ims-bordeaux.fr> Fixes: d819d97ea025 ("btrfs: honor path->skip_locking in backref code") Signed-off-by: Stanislaw Gruszka <sgrus...@redhat.com> --- I did not test the patch, not even compile, but backport looks obviously wrong compared to original commit. fs/btrfs/backref.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index d826fbaf7d50..e4d5e6eae409 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -1290,8 +1290,6 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans, ret = -EIO; goto out; } - btrfs_tree_read_lock(eb); - btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); if (!path->skip_locking) { btrfs_tree_read_lock(eb); btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); -- 2.20.1
