Race condition with Java proxy extenders
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Key: JRUBY-931
URL: http://jira.codehaus.org/browse/JRUBY-931
Project: JRuby
Issue Type: Bug
Components: Java Integration
Affects Versions: JRuby 1.0.0RC1
Environment: Verified on PowerPC OS X with Java 1.5.0_07 and WinXP
with Java 1.6.0-b105.
Reporter: Jonathan Paisley
Priority: Minor
Attachments: multithread_proxy_extend.rb
The attached sample program reproduces a ConcurrentModificationException due to
thread-unsafe handling of the proxy extenders list in Java.java. The resolution
will require some smarter locking, taking care to avoid deadlocks.
Tested against trunk r3642.
Sample output:
AbstractList.java:449:in `java.util.AbstractList$Itr.checkForComodification':
java.util.ConcurrentModificationException: null (NativeException)
from AbstractList.java:420:in `java.util.AbstractList$Itr.next'
from Java.java:318:in `org.jruby.javasupport.Java.get_proxy_class'
from null:-1:in
`org.jruby.javasupport.JavaInvokerSget_proxy_class1.call'
from FastInvocationCallback.java:49:in
`org.jruby.runtime.callback.FastInvocationCallback.execute'
from SimpleCallbackMethod.java:81:in
`org.jruby.internal.runtime.methods.SimpleCallbackMethod.call'
from EvaluationState.java:563:in
`org.jruby.evaluator.EvaluationState.callNode'
from EvaluationState.java:205:in
`org.jruby.evaluator.EvaluationState.evalInternal'
from EvaluationState.java:162:in
`org.jruby.evaluator.EvaluationState.eval'
... 74 levels...
from Main.java:95:in `org.jruby.Main.main'
from :-1:in `each'
from multithread_proxy_extend:23
Complete Java stackTrace
java.util.ConcurrentModificationException
at
java.util.AbstractList$Itr.checkForComodification(AbstractList.java:449)
at java.util.AbstractList$Itr.next(AbstractList.java:420)
at org.jruby.javasupport.Java.get_proxy_class(Java.java:318)
at org.jruby.javasupport.JavaInvokerSget_proxy_class1.call(Unknown
Source)
at
org.jruby.runtime.callback.FastInvocationCallback.execute(FastInvocationCallback.java:49)
at
org.jruby.internal.runtime.methods.SimpleCallbackMethod.call(SimpleCallbackMethod.java:81)
at
org.jruby.evaluator.EvaluationState.callNode(EvaluationState.java:563)
at
org.jruby.evaluator.EvaluationState.evalInternal(EvaluationState.java:205)
at org.jruby.evaluator.EvaluationState.eval(EvaluationState.java:162)
at org.jruby.runtime.Block.yield(Block.java:220)
at org.jruby.runtime.Block.yield(Block.java:186)
at org.jruby.RubyArray.each(RubyArray.java:1278)
at org.jruby.RubyArrayInvokereach0.call(Unknown Source)
at
org.jruby.runtime.callback.InvocationCallback.execute(InvocationCallback.java:49)
at
org.jruby.internal.runtime.methods.FullFunctionCallbackMethod.internalCall(FullFunctionCallbackMethod.java:79)
at
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:79)
at
org.jruby.evaluator.EvaluationState.callNode(EvaluationState.java:576)
at
org.jruby.evaluator.EvaluationState.evalInternal(EvaluationState.java:205)
at
org.jruby.evaluator.EvaluationState.blockNode(EvaluationState.java:521)
at
org.jruby.evaluator.EvaluationState.evalInternal(EvaluationState.java:199)
at
org.jruby.evaluator.EvaluationState.rootNode(EvaluationState.java:1620)
at
org.jruby.evaluator.EvaluationState.evalInternal(EvaluationState.java:354)
at org.jruby.evaluator.EvaluationState.eval(EvaluationState.java:162)
at org.jruby.Ruby.eval(Ruby.java:276)
at org.jruby.Main.runInterpreter(Main.java:233)
at org.jruby.Main.runInterpreter(Main.java:190)
at org.jruby.Main.run(Main.java:120)
at org.jruby.Main.main(Main.java:95)
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