--- a/hotspot/src/share/vm/runtime/thread.cpp Tue Jul 25 13:28:14 2017 -0400
+++ b/hotspot/src/share/vm/runtime/thread.cpp Mon Jul 31 12:37:34 2017 -0700
@@ -3392,6 +3392,13 @@
tc->do_thread(p);
}
}
+ // Thread claiming protocol requires us to claim the same interesting
+ // threads on all paths. Notably, Threads::possibly_parallel_threads_do
+ // claims all Java threads *and* the VMThread. To avoid breaking the
+ // claiming protocol, we have to claim VMThread on this path too, even
+ // if we do not apply the closure to the VMThread.
+ VMThread* vmt = VMThread::vm_thread();
+ (void)vmt->claim_oops_do(true, cp);
}
// The system initialization in the library has three phases.
@@ -4357,6 +4364,10 @@
assert((thread_parity == _thread_claim_parity),
"Thread " PTR_FORMAT " has incorrect parity %d != %d", p2i(p), thread_parity, _thread_claim_parity);
}
+ VMThread* vmt = VMThread::vm_thread();
+ const int thread_parity = vmt->oops_do_parity();
+ assert((thread_parity == _thread_claim_parity),
+ "VMThread " PTR_FORMAT " has incorrect parity %d != %d", p2i(vmt), thread_parity, _thread_claim_parity);
}
#endif // ASSERT