JDK-6763340 : memory leak in com.sun.corba.se.* classes
  • Type: Bug
  • Component: other-libs
  • Sub-Component: corba:orb
  • Affected Version: 5.0u16
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • OS: windows_xp
  • CPU: x86
  • Submitted: 2008-10-23
  • Updated: 2010-12-04
  • Resolved: 2009-09-21
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Other Other Other JDK 6 JDK 7
5.0u21-rev b03Fixed 5.0u22-revFixed 5.0u23Fixed 6u16-revFixed 7Fixed
Related Reports
Relates :  
JDK-6873605 - Missing finishedDispatch() call in ORBImpl causes test failures after 5u20 b04
Description
Customer reports a memory leak with a WebLogic app with 1.5.0_16. Histograms shows several classes continuously growing over time. These classes include weblogic.corba.client.utils.EndPointInfo and several com.sun.cobra.se.impl.* classes. The heap dump shows EndPointInfo is held by reference by com.sun.corba.se.impl.legacy.connection.SocketFactoryContactInfoImpl

References to SocketFactoryContactInfoImpl were more com.sun.cobra.se.impl.* classes. Going further up the stack, I found these com.sun classes were referencing each other in a circular fashion.

I looked at one particular instance of com.sun.corba.se.impl.legacy.connection.SocketFactoryConnectionImpl. There are over 8800 references to this instance. Here are some of the references.

com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl@0x1d1b75d8 (85 bytes) : field connection
com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl@0x1da72108 (85 bytes) : field connection
com.sun.corba.se.impl.encoding.CDRInputObject@0x22062df8 (37 bytes) : field corbaConnection
com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl@0x1aba53a0 (85 bytes) : field connection 

Here a two relevant bugs, 6725987 and 6553303. Could they be the source of this problem?

CR 6725987 says ORB.destroy() does not cleanup correctly and ORB object instances are not garbage collected.

The evaluation for CR 6553303 says one part of this problem is clear: if the ORB successfully opens a connection, but sometime later the connection is no longer usable, it gets stuck in the cache.
The customer reported that this issue only happens with JDK 1.5. There is no problem on JDK 1.4.2. They also report the issue happens with JDK 1.5 only when IOP is used. The webapp runs fine on JDK 1.5 with TCP.
Comments
EVALUATION http://hg.openjdk.java.net/jdk7/build/corba/rev/cff5a173ec1e
04-12-2010
SUGGESTED FIX http://jpsesvr.sfbay.sun.com:8080/ctetools/html/ViewDetail.jsp?index=3047
23-07-2009
EVALUATION While cyclic references themselves do NOT cause leaks, there were other problems that did cause memory leaks, notably some issues with ThreadLocals, and some transport resources that were not properly freed. This bug appears to be simply another manifestation of the problems that we fixed in 6725987. The fixes for that bug are/will be available in (according to 6725987) in 6u12 and 5.0u20. I suggest that you re-test for this problem with those releases. If there are any other issues (such as the WebLogic endpoint info in the LegacySocketFactory, which was not part of the test for 6725987) please update this bug or file a new bug.
29-10-2008