438b9544a0
This adds several new checks to help debug #27993. It adds a mechanism for freezing write barriers and gcWork puts during the mark completion algorithm. This way, if we do detect mark completion, we can catch any puts that happened during the completion algorithm. Based on build dashboard failures, this seems to be the window of time when these are happening. This also double-checks that all work buffers are empty immediately upon entering mark termination (much earlier than the current check). This is unlikely to trigger based on the current failures, but is a good safety net. Change-Id: I03f56c48c4322069e28c50fbc3c15b2fee2130c2 Reviewed-on: https://go-review.googlesource.com/c/151797 Run-TryBot: Austin Clements <austin@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> |
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