There's a VM crash in compiler thread with 6u6p b01:
#
# SIGSEGV (0xb) at pc=0xfffffd7ffee7fe71, pid=15404, tid=9
#
# Java VM: Java HotSpot(TM) 64-Bit Server VM (12.0-b03 mixed mode solaris-amd64)
# Problematic frame:
# V [libjvm.so+0x87fe71]

It is observed on solaris-x64 only.

hs_err*.log is attached.

Affected test:
compiler/6646020/Tester.java