PM01533: DEADLOCK IN NSSERIALPORT

APAR status

• Closed as program error.

Error description

• Error Message: Following Deadlock can be seen in javacore:
  1LKDEADLOCK    Deadlock detected !!!
  NULL           ---------------------
  NULL
  2LKDEADLOCKTHR  Thread "Thread-133" (97F9A68)
  3LKDEADLOCKWTR    is waiting for:
  4LKDEADLOCKMON      sys_mon_t:0x0964FAD8 infl_mon_t: 0x00000000:
  4LKDEADLOCKOBJ      java.util.Vector@118B40F8/118B4100:
  3LKDEADLOCKOWN    which is owned by:
  2LKDEADLOCKTHR  Thread "Thread-132" (97F7A00)
  3LKDEADLOCKWTR    which is waiting for:
  4LKDEADLOCKMON      sys_mon_t:0x09B96DA8 infl_mon_t: 0x00000000:
  4LKDEADLOCKOBJ      com.ibm.comm.NSSerialPort@118B4E70/118B4E78:
  3LKDEADLOCKOWN    which is owned by:
  2LKDEADLOCKTHR  Thread "Thread-133" (97F9A68)
  .
  Stack Trace: The threads in deadlock have following stack
  traces:
  3XMTHREADINFO      "Thread-133" (TID:101F6EB0,
  sys_thread_t:97F9A68, state:R, native ID:2C80A8) prio=5
  4XESTACKTRACE          at
  com.ibm.comm.NSSerialPort$SerialEventDeliveryThread.addEvent(NSS
  erialPort.java:1282)
  4XESTACKTRACE          at
  com.ibm.comm.NSSerialPort.reportSerialEvent(NSSerialPort.java:12
  34)
  4XESTACKTRACE          at
  com.ibm.comm.NSSerialPort.setByteCount(NSSerialPort.java:1147)
  4XESTACKTRACE          at
  com.ibm.comm.SerialDataEventThread.monitorSerialDataNC(Native
  Method)
  4XESTACKTRACE          at
  com.ibm.comm.SerialDataEventThread.run(SerialDataEventThread.jav
  a:50)
  and
  3XMTHREADINFO      "Thread-132" (TID:101F6F10,
  sys_thread_t:97F7A00, state:R, native ID:2C40A7) prio=5
  4XESTACKTRACE          at
  com.ibm.comm.NSSerialPort.reportSerialEvent(NSSerialPort.java:12
  37)
  4XESTACKTRACE          at
  com.ibm.comm.NSDeviceOutputStream.write(NSDeviceOutputStream.jav
  a:194)
  4XESTACKTRACE          at
  com.ibm.comm.NSDeviceOutputStream.write(NSDeviceOutputStream.jav
  a:73)
  4XESTACKTRACE          at
  java.io.DataOutputStream.writeBytes(DataOutputStream.java:282)
  4XESTACKTRACE          at
  com.gap.pos.device.GapSerialConnection_FR.sendRequest(GapSerialC
  onnection_FR.java:428)
  4XESTACKTRACE          at
  com.gap.pos.device.GapSerialConnection_FR.sendACK(GapSerialConne
  ction_FR.java:658)
  4XESTACKTRACE          at
  com.gap.pos.device.GapSerialConnection_FR.readResponse(GapSerial
  Connection_FR.java:316)
  4XESTACKTRACE          at
  com.gap.pos.device.GapSerialConnection_FR.serialEvent(GapSerialC
  onnection_FR.java:375)
  4XESTACKTRACE          at
  com.ibm.comm.NSSerialPort$SerialEventDeliveryThread.run(NSSerial
  Port.java:1314)
  .
  

Local fix

Problem summary

• The Problem is caused when two threads try to execute
  NSSerialPort$SerialEventDeliveryThread.addEvent() from
  reportSerialEvent() and NSSerialPort.reportSerialEvent().
  

Problem conclusion

• This defect will be fixed in:
  1.4.2 SR13 FP4 (Linux)
  .
  The javacomm code has been updated to avoid the reported
  deadlock.
  .
  To obtain the fix:
  Install build 20091224 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:

  IZ75293

Fix information

• Fixed component name

  JAVA(1.3/1.4 CO

• Fixed component ID

  5648C9800

Applicable component levels

• R42L PSN

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