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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>
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@ -201,7 +201,7 @@ func heapBitsForObject(p uintptr) (base uintptr, hbits heapBits, s *mspan) {
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// The following ensures that we are rigorous about what data
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// structures hold valid pointers.
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// TODO(rsc): Check if this still happens.
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if false {
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if true {
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// Still happens sometimes. We don't know why.
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printlock()
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print("runtime:objectstart Span weird: p=", hex(p), " k=", hex(k))
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