The test testReadOfByteArray() from the unit test AddressInputStreamTest fails transiently on the gcstress configuration. The method reads 3 values from a byte array and one of the read values is 0 instead of the expected 127:
The problem occurs on both IA32 (32-bit) and PPC64, so it's likely to be in a machine-independent part of the VM.
On my IA32 machine, the failure rate seems to be at least 20% so it should be easy to reproduce this problem.
IA32 (32-bit), ppc64