f2d05389da
Currently we have write barriers for direct channel sends, where the receiver is blocked and the sender is writing directly to the receiver's stack; but not for direct channel receives, where the sender is blocked and the receiver is reading directly from the sender's stack. This was okay with the old write barrier because either 1) the receiver would write the received pointer into the heap (causing it to be shaded), 2) the pointer would still be on the receiver's stack at mark termination and we would rescan it, or 3) the receiver dropped the pointer so it wasn't necessarily reachable anyway. This is not okay with the write barrier because it lets a grey stack send a white pointer to a black stack and then remove it from its own stack. If the grey stack was the sole grey-protector of this pointer, this hides the object from the garbage collector. Fix this by making direct receives perform a stack-to-stack write barrier just like direct sends do. Fixes #17694. Change-Id: I1a4cb904e4138d2ac22f96a3e986635534a5ae41 Reviewed-on: https://go-review.googlesource.com/32450 Reviewed-by: Rick Hudson <rlh@golang.org> |
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