Index: libcfa/src/concurrency/kernel.cfa
===================================================================
--- libcfa/src/concurrency/kernel.cfa	(revision 7d6e01d4da997a6b00da903140b2ca630de5d766)
+++ libcfa/src/concurrency/kernel.cfa	(revision d47349b1ab1eec2bf6e908188329e1cc8dcfbb60)
@@ -630,4 +630,5 @@
 
 	// record activity
+	__cfaabi_dbg_debug_do( char * old_caller = thrd->unpark_caller; )
 	__cfaabi_dbg_record_thrd( *thrd, false, caller );