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runtime: remove GODEBUG=gcrescanstacks=1 mode
Currently, setting GODEBUG=gcrescanstacks=1 enables a debugging mode where the garbage collector re-scans goroutine stacks during mark termination. This was introduced in Go 1.8 to debug the hybrid write barrier, but I don't think we ever used it. Now it's one of the last sources of mark work during mark termination. This CL removes it. Updates #26903. This is preparation for unifying STW GC and concurrent GC. Updates #17503. Change-Id: I6ae04d3738aa9c448e6e206e21857a33ecd12acf Reviewed-on: https://go-review.googlesource.com/c/134777 Run-TryBot: Austin Clements <[email protected]> TryBot-Result: Gobot Gobot <[email protected]> Reviewed-by: Rick Hudson <[email protected]>
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