runtime: diagnose invalid pointers during GC
For #9880. Let's see what breaks.
Change-Id: Ic8b99a604e60177a448af5f7173595feed607875
Reviewed-on: https://go-review.googlesource.com/10818
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
diff --git a/src/runtime/mbitmap.go b/src/runtime/mbitmap.go
index ef17409..b9b52a7 100644
--- a/src/runtime/mbitmap.go
+++ b/src/runtime/mbitmap.go
@@ -201,7 +201,7 @@
// The following ensures that we are rigorous about what data
// structures hold valid pointers.
// TODO(rsc): Check if this still happens.
- if false {
+ if true {
// Still happens sometimes. We don't know why.
printlock()
print("runtime:objectstart Span weird: p=", hex(p), " k=", hex(k))
