Merge r7612 "In ProfilerSignalHandler ensure that thread we are trying

src/platform-linux.cc

Index: src/platform-linux.cc
===================================================================
--- src/platform-linux.cc	(revision 7635)
+++ src/platform-linux.cc	(working copy)
@@ -853,6 +853,11 @@
     // We require a fully initialized and entered isolate.
     return;
   }
+  if (v8::Locker::IsActive() &&
+      !isolate->thread_manager()->IsLockedByCurrentThread()) {
+    return;
+  }
+
   Sampler* sampler = isolate->logger()->sampler();
   if (sampler == NULL || !sampler->IsActive()) return;