IZ96932: DEADLOCK BETWEEN URLCLASSPATH AND APPCLASSLOADER.

APAR status

• Closed as program error.

Error description

• Error Message: 1LKDEADLOCK    Deadlock detected !!!
  NULL           ---------------------
  NULL
  2LKDEADLOCKTHR  Thread "DiscoverWorker-1" (0x7530BC00)
  3LKDEADLOCKWTR    is waiting for:
  4LKDEADLOCKMON      sys_mon_t:0x08DA14E8 infl_mon_t: 0x08DA1528:
  4LKDEADLOCKOBJ      sun/misc/URLClassPath@77DFAAC8/77DFAAD4:
  3LKDEADLOCKOWN    which is owned by:
  2LKDEADLOCKTHR  Thread "DiscoverWorker-14" (0x752BD400)
  3LKDEADLOCKWTR    which is waiting for:
  4LKDEADLOCKMON      sys_mon_t:0x081CE8C0 infl_mon_t: 0x081CE900:
  4LKDEADLOCKOBJ
  sun/misc/Launcher$AppClassLoader@77DFA788/77DFA794:
  3LKDEADLOCKOWN    which is owned by:
  2LKDEADLOCKTHR  Thread "DiscoverWorker-1" (0x7530BC00)
  .
  Stack Trace: Stack trace of Deadlocked threads :-
  3XMTHREADINFO      "DiscoverWorker-1" (TID:0x7530BC00,
  sys_thread_t:0x0885B538, state:B, native ID:0x00007580) prio=5
  4XESTACKTRACE   at
  sun/misc/URLClassPath.getResource(URLClassPath.java:324(Compiled
  Code))
  4XESTACKTRACE   at
  java/net/URLClassLoader$ClassFinder.run(URLClassLoader.java:1053
  (Compiled Code))
  4XESTACKTRACE   at
  java/security/AccessController.doPrivileged(AccessController.jav
  a:274)
  4XESTACKTRACE   at
  java/net/URLClassLoader.findClass(URLClassLoader.java:492(Compil
  ed Code))
  4XESTACKTRACE   at
  java/lang/ClassLoader.loadClass(ClassLoader.java:639(Compiled
  Code))
  4XESTACKTRACE   at
  sun/misc/Launcher$AppClassLoader.loadClass(Launcher.java:349(Com
  piled Code))
  4XESTACKTRACE   at
  java/lang/ClassLoader.loadClass(ClassLoader.java:605(Compiled
  Code))
  4XESTACKTRACE   at
  candle/fw/util/TepDataProvider.<clinit>(TepDataProvider.java:91)
  4XESTACKTRACE   at java/lang/J9VMInternals.initializeImpl(Native
  Method)
  4XESTACKTRACE   at
  java/lang/J9VMInternals.initialize(J9VMInternals.java:196(Compil
  ed Code))
  4XESTACKTRACE   at java/lang/Class.forNameImpl(Native Method)
  4XESTACKTRACE   at
  java/lang/Class.forName(Class.java:130(Compiled Code))
  4XESTACKTRACE   at
  com/collation/platform/session/SessionFactory.doITMSession(Sessi
  onFactory.java:662(Compiled Code))
  3XMTHREADINFO      "DiscoverWorker-14" (TID:0x752BD400,
  sys_thread_t:0x75507190, state:B, native ID:0x0000758D) prio=5
  4XESTACKTRACE   at
  sun/security/jca/ProviderConfig.getProvider(ProviderConfig.java:
  226)
  4XESTACKTRACE   at
  sun/security/jca/ProviderList.getProvider(ProviderList.java:251)
  4XESTACKTRACE   at
  sun/security/jca/ProviderList.getService(ProviderList.java:349(C
  ompiled Code))
  4XESTACKTRACE   at
  sun/security/jca/GetInstance.getInstance(GetInstance.java:156(Co
  mpiled Code))
  4XESTACKTRACE   at
  java/security/cert/CertificateFactory.getInstance(CertificateFac
  tory.java:155)
  4XESTACKTRACE   at
  sun/security/pkcs/PKCS7.parseSignedData(PKCS7.java:284(Compiled
  Code))
  4XESTACKTRACE   at sun/security/pkcs/PKCS7.parse(PKCS7.java:181)
  4XESTACKTRACE   at sun/security/pkcs/PKCS7.parse(PKCS7.java:149)
  4XESTACKTRACE   at
  sun/security/pkcs/PKCS7.<init>(PKCS7.java:136)
  .
  

Local fix

Problem summary

• The problem use to happen when a (loader) thread tries to get
  some resource via getResourceAsStream API while in parallel
  another thread tries to load some class plus having signed jars
  in the classpath.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR12 FP5
  6.0.0 SR10
  .
  JVM has been modified to take care of the deadlock scenario.
  .
  To obtain the fix:
  Install build 20110825 or later
  

Temporary fix

• ZE FIX ERROR IV25687 12/08/16
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  IZ96933

Fix information

• Fixed component name

  JAVA 5 CLASS LI

• Fixed component ID

  620500130

Applicable component levels

• R500 PSY

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