intermittent test failure in storetests/st_derby715.java

I am seeing an irregularly occurring failure with ibm 1.4.2 on one machine - which happens to be the only 4 CPU machine and the only one running Windows 2008...And I've got 10.8 nightly tests running on it.

I have not seen this with other jvms on the same machine.
It's possible this would also happen on trunk, but we stopped supporting 1.4.2 with trunk and so I do not run tests against trunk with (ibm) 1.4.2.

When the test passes, the output contains 5 identical lines 'Got a Deadlock'.
The test failures are of 2 kinds:

• 1 (or more?) of the 'Got a Deadlock' lines is missing
• we get a '40XL1' error (timeout) instead of a deadlock.

As the second situation seems to match what DERBY-715 was about, I thought it worthwhile reporting as a separate JIRA. We should check it's not somehow a regression.