b05f18e3f7
GC assists check gcBlackenEnabled under the assist queue lock to avoid going to sleep after gcWakeAllAssists has already woken all assists. However, currently we clear gcBlackenEnabled shortly *after* waking all assists, which opens a window where this exact race can happen. Fix this by clearing gcBlackenEnabled before waking blocked assists. However, it's unlikely this actually matters because the world is stopped between waking assists and clearing gcBlackenEnabled and there aren't any obvious allocations during this window, so I don't think an assist could actually slip in to this race window. Updates #13645. Change-Id: I7571f059530481dc781d8fd96a1a40aadebecb0d Reviewed-on: https://go-review.googlesource.com/18682 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org> |
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