IZ56227: READ TO A SOCKET BLOCKS CONCURRENT WRITES

APAR status

• Closed as program error.

Error description

• Error Message:
  
  
  .
  Stack Trace:
  
  3XMTHREADINFO      "IM_POOL_THREAD_0" (TID:0x094F9B00,
  sys_thread_t:0x09308D18, state:B, native ID:0x0000164E) prio=5
  4XESTACKTRACE          at
  java/nio/channels/spi/AbstractSelectableChannel.isBlocking(Abstr
  actSelectableChannel.java:257)
  4XESTACKTRACE          at
  java/nio/channels/spi/AbstractInterruptibleChannel.begin(Abstrac
  tInterruptibleChannel.java:180)
  4XESTACKTRACE          at
  sun/nio/ch/SocketChannelImpl.write(SocketChannelImpl.java:326(Co
  mpiled Code))
  4XESTACKTRACE          at
  com/xxxxxx/ca/xmpp/smack/XMPPAsyncConnection$MyWriter.flush(XMPP
  AsyncConnection.java:187(Compiled Code))
  4XESTACKTRACE          at
  java/io/BufferedWriter.flush(BufferedWriter.java:257)
  .
  .
  A blocking read on a socket blocks concurrent writes.
  The writer can be seen waiting in
  AbstractSelectableChannel.isBlocking( ).
  

Local fix

Problem summary

• Hang scenario is observed due to a feature introduced for better
  performance.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR?
  .
  JDK codebase is update to avoid the hang scenario caused due a
  feature.
  .
  To obtain the fix:
  Install build 20090916 or later
  

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

  JAVA 5 CLASS LI

• Fixed component ID

  620500130

Applicable component levels

• R500 PSN

     UP