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Running Boomerang in parallel can lead to java.util.ConcurrentModificationException #239

@Hazem-Gamall

Description

@Hazem-Gamall

Description

Running a Boomerang solver in parallel sometime leads to java.util.ConcurrentModificationException. This problem doesn't always occur because of a specific place in the Boomerang codebase, apparently multiple different places (demonstrated by different stack straces for each time the exception is thrown) suffer from this problem.

Version

4.3.3-SNAPSHOT

Stack trace

java.util.ConcurrentModificationException
	at java.base/java.util.HashMap$KeySpliterator.tryAdvance(HashMap.java:1738)
	at java.base/java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:129)
	at java.base/java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:527)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:513)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230)
	at java.base/java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.noneMatch(ReferencePipeline.java:642)
	at boomerang.solver.BackwardBoomerangSolver.notUsedInMethod(BackwardBoomerangSolver.java:86)
	at boomerang.solver.BackwardBoomerangSolver.computeSuccessor(BackwardBoomerangSolver.java:156)
	at sync.pds.solver.SyncPDSSolver.processNode(SyncPDSSolver.java:481)
	at sync.pds.solver.SyncPDSSolver.setCallingContextReachable(SyncPDSSolver.java:724)
	at sync.pds.solver.SyncPDSSolver$CallAutomatonListener.onWeightAdded(SyncPDSSolver.java:436)
	at wpds.impl.WeightedPAutomaton.addWeightForTransition(WeightedPAutomaton.java:324)
	at sync.pds.solver.SyncPDSSolver$4.addWeightForTransition(SyncPDSSolver.java:168)
	at sync.pds.solver.SyncPDSSolver.solve(SyncPDSSolver.java:466)
	at sync.pds.solver.SyncPDSSolver.solve(SyncPDSSolver.java:476)
	at boomerang.WeightedBoomerang.backwardSolve(WeightedBoomerang.java:1131)
	at boomerang.WeightedBoomerang.solve(WeightedBoomerang.java:1016)
	at boomerang.WeightedBoomerang.solve(WeightedBoomerang.java:1000)
	...

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