--- a/src/hotspot/share/jfr/periodic/sampling/jfrThreadSampler.cpp	Tue May 22 11:04:36 2018 -0700
+++ b/src/hotspot/share/jfr/periodic/sampling/jfrThreadSampler.cpp	Tue May 22 14:49:39 2018 -0400
@@ -453,6 +453,9 @@
 
 void JfrThreadSampler::run() {
   assert(_sampler_thread == NULL, "invariant");
+
+  record_stack_base_and_size();
+
   _sampler_thread = this;
 
   jlong last_java_ms = get_monotonic_ms();