Issue was found during testing of JDK 1.5.0_34 b01_j4b.
Behavior of jvmti function GetThreadInfo doesn't corresponds to specification:
http://download.oracle.com/javase/1.5.0/docs/guide/jvmti/jvmti.html#GetThreadInfo

As it mentioned in specification, GetThreadInfo should returns information for current thread in case when NULL was passed as pointer to thread. But it returns JVMTI_ERROR_INVALID_THREAD error.

Test nsk/jvmti/GetThreadInfo/thrinfo002 failed with next error:
[2011-11-21T07:11:06.53] Error expected: JVMTI_ERROR_NONE,
[2011-11-21T07:11:11.76] got: JVMTI_ERROR_INVALID_THREAD (10)

Full log: http://vice.russia.sun.com/results/1.5.0_34/b01_j4b/vm/oel5.6-x86-32_nsk.jvmti.testlist_01/ResultDir/thrinfo002/thrinfo002.log

Test also failed with JDK 1.5.0 FCS.
Issue was not found earlier because failed test was not work as specified. It was updated during testbase backporting.