diff -r 5f3b9b633731 -r 7e268f863ff0 src/hotspot/share/runtime/safepoint.cpp
--- a/src/hotspot/share/runtime/safepoint.cpp	Wed Dec 05 17:33:01 2018 +0000
+++ b/src/hotspot/share/runtime/safepoint.cpp	Wed Dec 05 15:57:26 2018 +0100
@@ -732,6 +732,7 @@
   // Finish monitor deflation.
   ObjectSynchronizer::finish_deflate_idle_monitors(&deflate_counters);
 
+  assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer");
 }