Reviewed-by: dsamersoff, erikj

8076995: gc/ergonomics/TestDynamicNumberOfGCThreads.java failed with java.lang.RuntimeException: 'new_active_workers' missing from stdout/stderr
Reviewed-by: jmasa, drwhite

Reviewed-by: jmasa, kbarrett, tschatzl

Summary: Adding missing check for valid oop.
Reviewed-by: dcubed
Contributed-by: NShafi Ahmad <shafi.s.ahmad@oracle.com>

Reviewed-by: kvn

Reviewed-by: dcubed, dsamersoff

Reviewed-by: kbarrett, tschatzl

Reviewed-by: kvn

Reviewed-by: kvn, mdoerr

Reviewed-by: dsamersoff, dcubed

Reviewed-by: stuefe, coleenp, roland

Reviewed-by: sspitsyn, coleenp, dcubed

Summary: Do not make reused PRTs available to other threads before the bitmap of the PRT has been cleared.
Reviewed-by: tbenson, mgerdin, brutisso
Contributed-by: NPoonam Bajaj &lt;poonam.bajaj@oracle.com&gt;, Thomas Schatzl <thomas.schatzl@oracle.com>

8139424: SIGSEGV, Problematic frame: # V [libjvm.so+0xd0c0cc] void InstanceKlass::oop_oop_iterate_oop_maps_specialized<true,oopDesc*,MarkAndPushClosure>
Summary: The crash was caused by a faulty eager humongous reclaim. The reason for reclaiming a live object was that the call to cleanupHRRS was done after dirtying cards and clearing the remembered sets for the humongous object. This could lead to one or many cards being missed.
Reviewed-by: tbenson, kbarrett, tschatzl