When we have cascading locks with same lk-owner there is a possibility for
    a deadlock to happen. One example is as follows:
    
    self-heal takes a lock in data-domain for big name with 256 chars of "aaaa...a"
    and starts heal in a 3-way replication when brick-0 is offline and healing from
    brick-1 to brick-2 is in progress. So this lock is active on brick-1 and
    brick-2. Now brick-0 comes online and an operation wants to take full lock and
    the lock is granted at brick-0 and it is waiting for lock on brick-1. As part
    of entry healing it takes full locks on all the available bricks and then
    proceeds with healing the entry. Now this lock will start waiting on brick-0
    because some other operation already has a granted lock on it. This leads to a
    deadlock. Operation is waiting for unlock on "aaaa..." by heal where as heal is
    waiting for the operation to unlock on brick-0. Initially I thought this is
    happening because healing is trying to take a lock on all the available bricks
    instead of just the bricks that are participating in heal. But later realized
    that same kind of deadlock can happen if a brick goes down after the heal
    starts but comes back before it completes. So the essential problem is the
    cascading locks with same lk-owner which were added for backward compatibility
    with afr-v1 which can be safely removed now that versions with afr-v1 are
    already EOL. This patch removes the compatibility with v1 which requires
    cascading locks with same lk-owner.

REVIEW: http://review.gluster.org/16389 (cluster/afr: Remove backward compatibility for locks with v1) posted (#1) for review on release-3.8 by Pranith Kumar Karampuri (pkarampu)

This bug is getting closed because the 3.8 version is marked End-Of-Life. There will be no further updates to this version. Please open a new bug against a version that still receives bugfixes if you are still facing this issue in a more current release.