683aa8893a
Conservatively scan the extended register state when GC scans asynchronously preempted goroutines. This ensures that any pointers that appear only in vector registers at preemption time are kept alive. Using vector registers for small memory moves may load pointers into these registers. If async preemption occurs mid-move, with no write barrier (e.g., heap-to-stack copies) and the source register clobbered or source memory modified by a racing goroutine, the pointer may exist only in the vector register. Without scanning this state, GC could miss live pointers. This addresses concerns raised in CL 738261 and enables safe use of vector registers for operations that may involve pointers. Change-Id: I5f5ce98d6ed6f7cde34b33da0aea1f880c2fcf41 Reviewed-on: https://go-review.googlesource.com/c/go/+/740681 Reviewed-by: Keith Randall <khr@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Austin Clements <austin@google.com>
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