IV76044: DEADLOCK OBSERVED WHILE INTERRUPTING A THREAD DOING SOCKETCHANNEL.READ()

APAR status

• Closed as program error.

Error description

• Error Message: Deadlock occurred when a thread doing
  
  java.nio.channels.SocketChannel.read() is interrupted by another
  thread.
  .
  Stack Trace: Thread-6" J9VMThread:0x00000000007AB300,
  j9thread_t:0x00007F5CB011C6D0,
  java/lang/Thread:0x00000000FFEB7FD8,
  Blocked on: java/lang/Thread$ThreadLock@0x00000000FFEB80B0 Owned
  by: "main" (J9VMThread:0x0000000000643500,
  java/lang/Thread:0x00000000E003A648)
  Java callstack:
  at java/lang/Thread.blockedOn(Thread.java:1088)
  at java/lang/Access.blockedOn(Access.java:41)
  at
  java/nio/channels/spi/AbstractInterruptibleChannel.blockedOn(Abs
  tractInterruptibleChannel.java:229)
  at
  java/nio/channels/spi/AbstractInterruptibleChannel.end(AbstractI
  nterruptibleChannel.java:216)
  at sun/nio/ch/SocketChannelImpl.poll(SocketChannelImpl.java:970)
     (entered lock: java/lang/Object@0x00000000FFEC9ED0, entry
  count: 1)
  at
  sun/nio/ch/SocketAdaptor$SocketInputStream.read(SocketAdaptor.ja
  va:216)
     (entered lock: java/lang/Object@0x00000000FFEC9EC0, entry
  count: 1)
  at
  sun/nio/ch/ChannelInputStream.read(ChannelInputStream.java:115)
     (entered lock:
  sun/nio/ch/SocketAdaptor$SocketInputStream@0x00000000FFECA700,
  entry count: 1)
  at
  java/nio/channels/Channels$ReadableByteChannelImpl.read(Channels
  .java:396)
     (entered lock: java/lang/Object@0x00000000FFECA948, entry
  count: 1)
  "main" J9VMThread:0x0000000000643500,
  j9thread_t:0x0000000000609060,
  java/lang/Thread:0x00000000E003A648,
  Blocked on: java/lang/Object@0x00000000FFEC9EC0 Owned by:
  "Thread-6" (J9VMThread:0x00000000007AB300,
  java/lang/Thread:0x00000000FFEB7FD8)
  Java callstack:
  at
  java/nio/channels/spi/AbstractSelectableChannel.implCloseChannel
  (AbstractSelectableChannel.java:245)
  at
  java/nio/channels/spi/AbstractInterruptibleChannel$1.interrupt(A
  bstractInterruptibleChannel.java:176)
     (entered lock: java/lang/Object@0x00000000FFEC9EA0, entry
  count: 1)
  at java/lang/Thread.interrupt(Thread.java:559)
     (entered lock:
  java/lang/Thread$ThreadLock@0x00000000FFEB80B0, entry count: 1)
  .
  

Local fix

Problem summary

• The deadlock occurred due to a lock contention between
  SocketChannel read and interrupt threads when a thread
  reading data from a socket channel is interrupted by another
  thread.
  

Problem conclusion

• JDK NIO channel code is updated to avoid the lock contention
  between SocketChannel read and interrupt threads.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR2       (8.0.2.0)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

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 CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels

• R800 PSY

     UP