--- a/src/hotspot/os/linux/os_linux.cpp	Wed Dec 26 19:24:00 2018 -0500
+++ b/src/hotspot/os/linux/os_linux.cpp	Thu Dec 27 21:17:11 2018 -0500
@@ -705,6 +705,8 @@
     }
   }
 
+  assert(osthread->pthread_id() != 0, "pthread_id was not set as expected");
+
   // call one more level start routine
   thread->call_run();