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Test gc/g1/TestStringDeduplicationMemoryUsage.java failed with following exception during PIT for 8u20-b16: java.lang.Exception: Unexpected memory usage, heapMemoryUsageWithDedup should be less or equal to heapMemoryUsageWithDedupExpected at TestStringDeduplicationTools.testMemoryUsage(TestStringDeduplicationTools.java:520) at TestStringDeduplicationMemoryUsage.main(TestStringDeduplicationMemoryUsage.java:34) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:483) at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94) at java.lang.Thread.run(Thread.java:745) Memory usage summary: heapMemoryUsageWithoutDedup: 1752176 heapMemoryUsageWithDedup: 655048 heapMemoryUsageWithDedupExpected: 632288 I was able to reproduce this issue on the same host, but it happened intermittently - it may take from 1 to 10 tries before test fail.