potential deadlock in TransformerCollection
-------------------------------------------
Key: GERONIMO-3141
URL: https://issues.apache.org/jira/browse/GERONIMO-3141
Project: Geronimo
Issue Type: Bug
Security Level: public (Regular issues)
Affects Versions: 2.0-M6
Reporter: Kevan Miller
Fix For: 2.0-M6
Jason Dillon ran into the following deadlock:
Full thread dump Java HotSpot(TM) Client VM (1.5.0_11-b03 mixed mode):
"Finalizer" daemon prio=1 tid=0x080ceec8 nid=0x6b27 waiting for monitor entry
[0xea45c000..0xea45d130]
at
org.apache.geronimo.transformer.TransformerCollection.transform(TransformerCollection.java:35)
at
sun.instrument.TransformerManager.transform(TransformerManager.java:122)
at
sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:155)
at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:82)
at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)
"main" prio=1 tid=0x0805e6e8 nid=0x6b22 waiting for monitor entry
[0xffc7c000..0xffc7d9a8]
at java.lang.ClassLoader.findBootstrapClass(Native Method)
at java.lang.ClassLoader.findBootstrapClass0(ClassLoader.java:891)
at java.lang.ClassLoader.loadClass(ClassLoader.java:301)
- locked <0xeaad5588> (a sun.misc.Launcher$ExtClassLoader)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
- locked <0xeaad31e0> (a sun.misc.Launcher$AppClassLoader)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
- locked <0xeaad31e0> (a sun.misc.Launcher$AppClassLoader)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
- locked <0xeaad31e0> (a sun.misc.Launcher$AppClassLoader)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
- locked <0xeaad31e0> (a sun.misc.Launcher$AppClassLoader)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
- locked <0xeaad31e0> (a sun.misc.Launcher$AppClassLoader)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
- locked <0xeaad31e0> (a sun.misc.Launcher$AppClassLoader)
"VM Thread" prio=1 tid=0x080cb160 nid=0x6b23 runnable
"VM Periodic Task Thread" prio=1 tid=0x081ba5d0 nid=0x6b2b waiting on condition
Found one Java-level deadlock:
=============================
"Finalizer":
waiting to lock monitor 0x080cfe04 (object 0xeaad31e0, a
sun.misc.Launcher$AppClassLoader),
which is held by "main"
"main":
waiting to lock monitor 0x080cfe84 (object 0xee5e4a20, a [[I),
which is held by "Finalizer"
Gianny Damour found the following Sun bug report
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=5088398. I also ran across
the following OpenJPA jira -- https://issues.apache.org/jira/browse/OPENJPA-98
Same basic issue -- ClassFileTransformer.transform() is causing two threads to
obtain two ClassLoader locks in a different order -- thus the deadlock...
Barring a fix from Sun (IBM JDK fixed the problem reported in the OpenJPA
Jira), moving geronimo-transformer.jar to the system classpath may avoid this
problem (as suggested within the sun bug report). We may need all
ClassFileTransformer implementation jars to be on the system classpath...
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