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go/doc/next/6-stdlib/99-minor/runtime/pprof/66999.md

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The mutex profile for contention on runtime-internal locks now correctly points to the end of the critical section that caused the delay. This matches the profile's behavior for contention on sync.Mutex values. The runtimecontentionstacks setting for GODEBUG, which allowed opting in to the unusual behavior of Go 1.22 through 1.24 for this part of the profile, is now gone.