runtime: RSS seems to have increased in Go 1.24 while the runtime accounting has not [1.24 backport]

[gopherbot]

@mknyszek requested issue #72991 to be considered for backport to the next 1.24 minor release.

@gopherbot Please open a backport issue for Go 1.24.

This is a regression in 1.24 only. Unfortunately the fix uncovered some subtly wrong and scary things about asynchronous preemption. The changes include a fix, but given how subtle it is, we have decided to let it soak for a little bit before actually committing to the backport. Apologies to those waiting. There's a risk of introducing random crashes into programs not affected by this issue.

[mknyszek]

This context is lost in the comment copied over, but we still do want to backport a fix for this, sometime before the Go 1.25 release. The bug is preventing users from upgrading to Go 1.24 from Go 1.23. The fix itself is small and safe, in particular when not considering asynchronous preemption. Assuming we don't see any show-stoppers in the next month or so, I think we can safely backport the fix.