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97236ad5a6
When a locking request fails, the associated glock holder is automatically dequeued from the list of active and waiting holders. For GL_ASYNC locking requests, this will obviously happen asynchronously and it can race with attempts to cancel that locking request via gfs2_glock_dq(). Therefore, don't forget to check if a locking request has already been dequeued in gfs2_glock_dq(). Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>