dlmlock_master() returns DLM_RECOVERING/DLM_MIGRATING/ DLM_FORWAR after
adding lock to blocked list if lockres has the state
DLM_LOCK_RES_RECOVERING/DLM_LOCK_RES_MIGRATING/ DLM_LOCK_RES_IN_PROGRESS.
so it will retry in dlmlock().  And this may cause dlm_thread fall into an
infinite loop

	Thread1                                  dlm_thread

  calls dlm_lock->dlmlock_master,
  if lockresA is in state
  DLM_LOCK_RES_RECOVERING, calls
  __dlm_wait_on_lockres() and waits
  until others threads clear this
  state;

  If cannot grant this lock,
  adding lock to blocked list,
  and return DLM_RECOVERING;

                                        Grant this lock and move it to
                                        grant list;

  After a while, retry and
  calls list_add_tail(), adding lock
  to blocked list again.

Granted and blocked list of this lockres will become the following
conditions:

    lock_res->granted.next = dlm_lock->list_head;
    lock_res->blocked.next = dlm_lock->list_head;
    dlm_lock->list_head.next = dlm_lock_resource->blocked;

When dlm_thread traverses the granted list, it will fall into an endless
loop, checking dlm_lock.list_head, dlm_lock->list_head.next
(i.e.lock_res->blocked), lock_res->blocked.next(i.e.dlm_lock.list_head
again) .....
Signed-off-by: joyce <xuejiufei@huawei.com>
Reviewed-by: jensen <shencanquan@huawei.com>
Cc: Jeff Liu <jeff.liu@oracle.com>
Acked-by: Sunil Mushran <sunil.mushran@gmail.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>