The following occurs intermittently, can be reproduced with a call to frysk-core/TestRunner -r 1000 frysk.util.TestFStack. testStressMultiThreadedDetach(frysk.util.TestFStack)junit.framework.AssertionFailedError: ... couldn't print stack trace ... couldn't print stack trace ... couldn't print stack trace ... couldn't print stack trace Task #14719 #0 0xb5d402 in __kernel_vsyscall () #1 0x4a9d32b7 in sigsuspend () #2 0x804913a in server () from: /home/yyz/npremji/workspace/frysk/frysk-core/frysk/pkglibdir/funit-child.c#249 #3 0x8049b8e in main () from: /home/yyz/npremji/workspace/frysk/frysk-core/frysk/pkglibdir/funit-child.c#505 #4 0x4a9bff2c in __libc_start_main () #5 0x8048c11 in _start () Task #14720 #0 0xb5d402 in __kernel_vsyscall () #1 0x4a9d32b7 in sigsuspend () #2 0x804913a in server () from: /home/yyz/npremji/workspace/frysk/frysk-core/frysk/pkglibdir/funit-child.c#249 #3 0x4ab1d3db in start_thread () #4 0x4aa7706e in clone () Task #14721 #0 0xb5d402 in __kernel_vsyscall () #1 0x4a9d32b7 in sigsuspend () #2 0x804913a in server () from: /home/yyz/npremji/workspace/frysk/frysk-core/frysk/pkglibdir/funit-child.c#249 #3 0x4ab1d3db in start_thread () #4 0x4aa7706e in clone () Task #14722 #0 0xb5d402 in __kernel_vsyscall () #1 0x4a9d32b7 in sigsuspend () #2 0x804913a in server () from: /home/yyz/npremji/workspace/frysk/frysk-core/frysk/pkglibdir/funit-child.c#249 #3 0x4ab1d3db in start_thread () #4 0x4aa7706e in clone () should match: (Task #\d+ (#[\d]+ 0x[\da-f]+ in .* )*#[\d]+ 0x[\da-f]+ in server \(\) from: /home/yyz/npremji/workspace/frysk/frysk-core/frysk/pkglibdir/funit-child.c#[\d]+ #[\d]+ 0x[\da-f]+ in main \(\) from: /home/yyz/npremji/workspace/frysk/frysk-core/frysk/pkglibdir/funit-child.c#[\d]+ #[\d]+ 0x[\da-f]+ in __libc_start_main \(\) #[\d]+ 0x[\da-f]+ in _start \(\) )(Task #\d+ (#[\d]+ 0x[\da-f]+ in .* )*#[\d]+ 0x[\da-f]+ in server \(\) from: /home/yyz/npremji/workspace/frysk/frysk-core/frysk/pkglibdir/funit-child.c#[\d]+ #[\d]+ 0x[\da-f]+ in start_thread \(\) #[\d]+ 0x[\da-f]+ in (__)?clone \(\) ){7} threads at frysk.util.TestFStack.multiThreaded(TestRunner) at frysk.util.TestFStack.testStressMultiThreadedDetach(TestRunner) at frysk.junit.Runner.runCases(TestRunner) at frysk.junit.Runner.runArchCases(TestRunner) at frysk.junit.Runner.runTestCases(TestRunner) at TestRunner.main(TestRunner)