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Austin Clements authored
Currently, locking a G's stack by setting its status to _Gcopystack or _Gscan is unordered with respect to channel locks. However, when we make stack shrinking concurrent, stack shrinking will need to lock the G and then acquire channel locks, which imposes an order on these. Document this lock ordering and fix closechan to respect it. Everything else already happens to respect it. For #12967. Change-Id: I4dd02675efffb3e7daa5285cf75bf24f987d90d4 Reviewed-on: https://go-review.googlesource.com/20041Reviewed-by: Rick Hudson <rlh@golang.org> Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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