IV62988: DEADLOCK WITH JAVA.NIO.CHARSET.CHARSET.AVAILABLECHARSETS()

APAR status

• Closed as program error.

Error description

• Error Message: When multiple threads call
  Charset.availableCharsets() method concurrently, customer's
  application encountered a deadlock.
  .
  Stack Trace: Stacktrace of the threads involved in the
  deadlock:"Thread-1" #10 prio=5 os_prio=0 tid=0x000000000a8b2800
  nid=0x1024 waiting for monitor entry
  <OSB>0x0000000009d2d000<CSB>java.lang.Thread.State: BLOCKED (on
  object monitor)at
  sun.nio.cs.AbstractCharsetProvider.aliases(AbstractCharsetProvid
  er.java:195)- waiting to lock <0x00000000eb378d48> (a
  sun.nio.cs.ext.ExtendedCharsets)at
  sun.nio.cs.ext.ExtendedCharsets.aliasesFor(ExtendedCharsets.java
  :1297)at
  sun.nio.cs.ext.JIS_X_0208_MS5022X.<init>(JIS_X_0208_MS5022X.java
  :41)at sun.nio.cs.ext.MS50220.<clinit>(MS50220.java:61)at
  java.lang.Class.forName0(Native Method)at
  java.lang.Class.forName(Class.java:266)at
  sun.nio.cs.AbstractCharsetProvider.lookup(AbstractCharsetProvide
  r.java:142)at
  sun.nio.cs.AbstractCharsetProvider.access$000(AbstractCharsetPro
  vider.java:45)at
  sun.nio.cs.AbstractCharsetProvider$1.next(AbstractCharsetProvide
  r.java:183)- locked <0x00000000eb3bfe70> (a
  sun.nio.cs.ext.ExtendedCharsets)at
  sun.nio.cs.AbstractCharsetProvider$1.next(AbstractCharsetProvide
  r.java:173)at java.nio.charset.Charset.put(Charset.java:552)at
  java.nio.charset.Charset.access$300(Charset.java:275)at
  java.nio.charset.Charset$4.run(Charset.java:594)at
  java.nio.charset.Charset$4.run(Charset.java:586)at
  java.security.AccessController.doPrivileged(Native Method)at
  java.nio.charset.Charset.availableCharsets(Charset.java:585)"Thr
  ead-0" #9 prio=5 os_prio=0 tid=0x0000000009071800 nid=0x898 in
  Object.wait()
  <OSB>0x000000000ae0e000<CSB>java.lang.Thread.State: RUNNABLEat
  java.lang.Class.forName0(Native Method)at
  java.lang.Class.forName(Class.java:266)at
  sun.nio.cs.AbstractCharsetProvider.lookup(AbstractCharsetProvide
  r.java:142)at
  sun.nio.cs.AbstractCharsetProvider.access$000(AbstractCharsetPro
  vider.java:45)at
  sun.nio.cs.AbstractCharsetProvider$1.next(AbstractCharsetProvide
  r.java:183)- locked <0x00000000eb378d48> (a
  sun.nio.cs.ext.ExtendedCharsets)at
  sun.nio.cs.AbstractCharsetProvider$1.next(AbstractCharsetProvide
  r.java:173)at java.nio.charset.Charset.put(Charset.java:552)at
  java.nio.charset.Charset.access$300(Charset.java:275)at
  java.nio.charset.Charset$4.run(Charset.java:594)at
  java.nio.charset.Charset$4.run(Charset.java:586)at
  java.security.AccessController.doPrivileged(Native Method)at
  java.nio.charset.Charset.availableCharsets(Charset.java:585)
  .
  

Local fix

Problem summary

• Problem is caused due to lock ordering when multiple threads try
  to retrieve available charsets.
  

Problem conclusion

• JDK has been updated to avoid the deadlock by correcting the
  lock sequence.
  .
  This APAR will be fixed in the following Java Releases:
     7    SR7 FP1   (7.0.7.1)
     7 R1 SR1 FP1   (7.1.1.1)
  .
  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

• R700 PSY

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