The value of anchor is an address and it’s an unsigned value. The check should be fixed to handle unsigned value.
diff --git a/src/java.base/share/classes/java/lang/StackStreamFactory.java b/src/java.base/share/classes/java/lang/StackStreamFactory.java --- a/src/java.base/share/classes/java/lang/StackStreamFactory.java +++ b/src/java.base/share/classes/java/lang/StackStreamFactory.java @@ -230,8 +230,8 @@ } break; case OPEN: - if (this.anchor <= 0) { - throw new IllegalStateException("This stack stream is not valid for walking"); + if (this.anchor == 0 || this.anchor == -1L) { + throw new IllegalStateException("This stack stream is not valid for walking: " + anchor); } break; case CLOSED: Thanks Mandy