Review Request (XS) 8030027: nsk/jvmti/scenarios/hotswap/HS101/hs101t006 Crashed the vm on Linux-amd64: SIGSEGV in JavaThread::last_java_vframe(RegisterMap*)+0xfa

[serguei.spit...@oracle.com]

Please, review the fix for:
  https://bugs.openjdk.java.net/browse/JDK-8030027

Open webrev:
http://cr.openjdk.java.net/~sspitsyn/webrevs/2013/hotspot/8030027-JVMTI-HS101.1/

Summary:
  The bug is that the JavaThread::last_java_vframe (called from the 
VMOp_GetCurrentLocation)
  crashes on the target thread stack that is non-walkable because the 
thread is exiting.
  The fix is to check a condition !_thread->is_exiting() in the 
VMOp_GetCurrentLocation.
  The fix is for JDK 9.

Testing:
  The originally failing test nsk/jvmti/scenarios/hotswap/HS101/hs101t006
  In progress: nsk.jvmti, nsk.jdi, nsk.jdwp


Thanks,
Serguei