3267765 - IQ server encountered intermittent hang with forbid mutex

• IQ server becomes unresponsive intermittently 
  11/06 04:48 - 11/06 05:16
  11/06 06:17 - 11/06 06:50
• srvlog reports such error:
  W. 11/06 05:01:13.751383 Task 14c2ca8d0(Request task 190) is trying get forbid mutex held by task 15136acd0(Request task 206) for more than 60000 ms
  I. 11/06 06:48:00.643943 Connection terminated abnormally; client socket shut down
• lot's of jobs are canceled during the issue
  I. 11/06 06:35:25. 0000000000 Cancellation request received

• Stack trace:
  Threads (20): 106037255 131137757 30672583 65929313 44369513 27656993 59901341 52561507 8914079 59048743 
  .. _event_sleep
  .. _event_wait
  .. UnixTask::wait
  .. CondVar::wait
  .. Worker::yield_to_forbidding
  .. Worker::do_wait
  .. Worker::wait_ex
  .. DbCheckpoint::AcquireGate
  .. DbCheckpoint::suspend
  .. Connection::suspend_checkpoints
  .. DB_Commit_Chgs
  .. ri_commit
  .. Connection::commit_work

  Threads (1): 68092663         
   .. _event_sleep
  .. _event_wait
  .. UnixTask::wait
  .. CondVar::wait
  .. TimedMutex::get
  .. ForbidMutexSet::get
  .. Worker::get_forbid_mutex
  .. Worker::get_forbid_mutex
  .. Worker::prevent_forbid
  .. Connection::PreventForbid
  .. SQLAEngineSupport::AcquireResources
  .. st_SAIQInterface::Execute

SAP IQ 16.1 SP04 PL12

 Sybase , CR809642 , CR#809642 , deadlock, hang , freeze, bugzilla 154803 , bugzilla 154804 , KBA , BC-SYB-IQ , Sybase IQ , Known Error