PI87719: ABEND IN IMBREADWRITELOCK::WRITELOCK

APAR status

• Closed as program error.

Error description

• As with APAR PI79330, there are a few scenarios in IIB v10 where
  it is possible to abend as a result of errno EDEADLK for the
  iSessionRWLock when the Deploy Manager Cache attempts to delete
  a Session.
  
  The following error will be logged:
  
  +BIP2228E (Msg 1/1) <Broker>.agent 2993556746062004243 Severe
  error:
   /build/ib/S1000.s1/S1000P/src/CommonServices/Unix/ImbReadWriteL
  ock.cpp  256 pthread_rwlock_wrlock Abend file:
   <Broker_Home_Directory>/common/errors/<Broker>.agent.33816779.
   2993556746062004243.abend action: abort
  
  An abend with the following call traceback stack will be
  generated:
  
  ImbAbend::logSystemErrorAndTerminateProcessInternal(const ch
  ImbReadWriteLock::writeLock()
  ImbReadWriteLockInterface::WriteLock::WriteLock(ImbReadWrite
  ImbDeployManagerCache::deleteSession(const ImbWstring&,bool)
  Java_com_ibm_broker_config_proxy_DMSessionManager_deregister
  RUNCALLINMETHOD
  gpProtectedRunCallInMethod
  signalProtectAndRunGlue
  j9sig_protect
  gpProtectAndRun
  gpCheckCallin
  callStaticVoidMethodV
  JNIEnv_::CallStaticVoidMethod(_jclass*,_jmethodID*,...)
  ImbDeployManagerCache::sendReplyMessage(ImbDeployManagerProx
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of IBM Integration Bus v10.
  
  
  Platforms affected:
  z/OS, MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  In IIB v10, it is possible for the AdminAgent to abend when
  dealing with ImbDeployManagerProxySessions.
  
  An errno EDEADLK (a resource deadlock is avoided) is returned in
  an attempt to obtain the iSessionRWLock when the Deploy Manager
  Cache attempts to delete a Session.
  
  The following error will be logged:
  
  +BIP2228E (Msg 1/1) <Broker>.agent 2993556746062004243 Severe
  error:
  /build/ib/S1000.s1/S1000P/src/CommonServices/Unix/ImbReadWriteLo
  ck.cpp
  256 pthread_rwlock_wrlock Abend file:
  <Broker_Home_Directory>/common/errors/<Broker>.agent.33816779.
  2993556746062004243.abend action: abort
  
  A previous APAR, PI79330, resolved this issue for the
  ImbDeployManagerCache::sessionListMaintenance() function, but
  there are three other functions that might also result in this
  deadlock.
  
  An abend with the following call traceback stack will be
  generated:
  
  ImbAbend::logSystemErrorAndTerminateProcessInternal(const ch
  ImbReadWriteLock::writeLock()
  ImbReadWriteLockInterface::WriteLock::WriteLock(ImbReadWrite
  ImbDeployManagerCache::deleteSession(const ImbWstring&,bool)
  Java_com_ibm_broker_config_proxy_DMSessionManager_deregister
  RUNCALLINMETHOD
  gpProtectedRunCallInMethod
  signalProtectAndRunGlue
  j9sig_protect
  gpProtectAndRun
  gpCheckCallin
  callStaticVoidMethodV
  JNIEnv_::CallStaticVoidMethod(_jclass*,_jmethodID*,...)
  ImbDeployManagerCache::sendReplyMessage(ImbDeployManagerProx
  --- The call prior to sendReplyMessage on the stack can be
  either of the following ---
  <ImbDeployManagerCache::sessionListMaintenance()>
  <ImbDeployManagerCache::notifyProxiesOfDelete>
  <ImbDeployManagerCache::notifySpecificProxiesOfLogUpdates>
  <ImbDeployManagerCache::notifyProxies>
  

Problem conclusion

• The product has been modified to resolve the root cause of these
  abends.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v10.0      10.0.0.12
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

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

  IIB Z/OS

• Fixed component ID

  5655AB100

Applicable component levels