src/runtime/cpuprof.go | 1 +

diff --git a/src/runtime/cpuprof.go b/src/runtime/cpuprof.go
index fb841a9f3ddcb12191a009c1cd3b703cc114cf38..e00dcb1bbd2ef45586c146d5b632216351407c16 100644
--- a/src/runtime/cpuprof.go
+++ b/src/runtime/cpuprof.go
@@ -160,6 +160,7 @@ 			funcPC(_LostExternalCode) + sys.PCQuantum,
 			funcPC(_ExternalCode) + sys.PCQuantum,
 		}
 		cpuprof.log.write(nil, 0, hdr[:], lostStk[:])
+		p.lostExtra = 0
 	}
 }