PH59680: LIBERTY SERVER USING ZOSLOCALADAPTERS-1.0 DOES NOT SHUT DOWN AFTER OUTOFMEMORYERROR WITH ZOSAIO DISABLED

APAR status

• Closed as program error.

Error description

• This -Xdump can be used to cause the server to come down after
  an OutOfMemoryError:
  -Xdump:exit:events=throw+systhrow,filter=java/lang/OutOfMemoryE
  rror
  
  When using feature:
  zosLocalAdapters-1.0
  
  With Asynchronous TCP/IP sockets I/O for Liberty on z/OS
  disabled:
  CWWKB0104I: Authorized service group ZOSAIO is not available.
  
  The server hangs during shutdown.
  
  
  A dump of the Liberty address space will show this thread
  still active:
  
  name:          z/OS LCOM Native WRQ Listener Thread
  Thread object: com/ibm/ws/zos/channel/local/queuing/internal/Bl
  ackQueueListenerThread@ 0x821c6920
  Native info:   !j9vmthread 0x3ca07d00  !stack 0x3ca07d00
  Daemon:        true
  ID:            60 (0x3c)
  Priority:      5
  Thread.State:  RUNNABLE
  
  JVMTI state:   ALIVE RUNNABLE
  
  
  Java stack frames:
  
  com/ibm/ws/zos/channel/local/queuing/internal/NativeRequestHan
  dler.ntv_getWorkRequestElements(boolean) (Native Method)
  com/ibm/ws/zos/channel/local/queuing/internal/NativeRequestHand
  ler.getWorkRequestElements(boolean) source: NativeRequestHandler
  com/ibm/ws/zos/channel/local/queuing/internal/BlackQueueListene
  rThread.run() source: BlackQueueListenerThread.java:116
  

Local fix

• Enable Asynchronous TCP/IP sockets I/O for Liberty on z/OS by
  giving the user ID that starts the server read access to the
  appropriate profiles in the SAF server class
  BBG.AUTHMOD.BBGZSAFM.ZOSAIO
  

Problem summary

• Liberty server with ZOSAIO  disabled using ZOSLOCALADAPTERS-1.0
  does not shut down after getting an outofmemory error.
  
  If an entry in the array of cleanup routines to call is null,
  the call to the next routine cleanup will be skipped.
  
  The call to the cleanup routine that would have released the
  
  
  paused z/OS LCOM Native WRQ Listener Thread was skipped because
  the array entry before it
  
  was null. The array entry before the entry to release the
  paused z/OS LCOM Native WRQ
  
  Listener Thread is for ZOSAIO. The array entry for ZOSAIO is
  null because ZOSAIO is disabled.
  
  The following message  indicates ZOSAIO is disabled.
  
  
  CWWKB0104I: Authorized service group ZOSAIO is not available.
  

Problem conclusion

• The code was updated so cleanup routines will not be skipped.
  The fix for this APAR is targeted for inclusion in fix pack
  
  24.0.0.2. For more information,
  
  see 'Recommended Updates for WebSphere Application Server':
  
  https://www.ibm.com/support/pages/node/715553
  

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:

Modules/Macros

• bbgzsafm
  

Fix information

• Fixed component name

  LIBERTY PROF -

• Fixed component ID

  5655W6514

Applicable component levels