IT40516: SWITCHING FROM SECONDARY TO PRIMARY ROLE CAN HANG IN 'COND WAIT DRCB_COND'

APAR status

• Closed as program error.

Error description

• Switching an HDR secondary to primary mode can hang, with only
  this much in message log:
  
  04/05/22 13:23:35  Skipping failover callback.
  04/05/22 13:23:35  Make Primary state 10 failrecvr 0 type 3
  
  The onmode -d command initating this transition also might not
  return to the prompt.
  
  The onmode_mon thread would be seen in state 'cond wait
  drcb_cond' and in following stack:
  
    yield_processor_mvp
    mt_wait
    dr_start_lgr_shutdown
    dr_lgr_end
    dr_finish_recovery
    cloneOnmodeMakePrimary
    onmode_monitor
    th_init_initgls
    startup
  
  while the mreplay thread, the one the above stack is waiting on,
  would permanently be seen in state 'sleeping secs: 1'.
  
  A very similar hang might occur with other transitions, e.g.
  from RSS to standard mode.
  

Local fix

• Workaround with:
  CDR_FEATURES CLASSIC_REPLAY
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users of Informix Server prior to 14.10.xC9.                 *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Informix Server 14.10.xC9.                        *
  ****************************************************************
  

Problem conclusion

• Fixed in Informix Server 14.10.xC9.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  INFORMIX SERVER

• Fixed component ID

  5725A3900

Applicable component levels