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Currently most of these are marked go:nowritebarrier as a hint, but it's actually important that these not invoke write barriers recursively. The danger is that some gcWork method would invoke the write barrier while the gcWork is in an inconsistent state and that the write barrier would in turn invoke some other gcWork method, which would crash or permanently corrupt the gcWork. Simply marking the write barrier itself as go:nowritebarrierrec isn't sufficient to prevent this if the write barrier doesn't use the outer method. Thankfully, this doesn't cause any build failures, so we were getting this right. :) For #22460. Change-Id: I35a7292a584200eb35a49507cd3fe359ba2206f6 Reviewed-on: https://go-review.googlesource.com/72554 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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