Tests Failures on PPC64

[caiqian]

This is seen with and without CONFIG_UTRACE.

FAIL: watchpoint

ppc-dabr-race: ./../tests/ppc-dabr-race.c:141: handler_fail: Assertion `0' 
failed.
/bin/sh: line 5: 31750 Aborted               ${dir}$tst
FAIL: ppc-dabr-race

Are those known issues?

Thanks,
CAI Qian