|author||Michael Anthony Knyszek <email@example.com>||Wed Sep 09 16:52:18 2020 +0000|
|committer||Michael Knyszek <firstname.lastname@example.org>||Wed Sep 09 17:48:56 2020 +0000|
runtime: fix ReadMemStatsSlow's and CheckScavengedBits' chunk iteration Both ReadMemStatsSlow and CheckScavengedBits iterate over the page allocator's chunks but don't actually check if they exist. During the development process the chunks index became sparse, so now this was a possibility. If the runtime tests' heap is sparse we might end up segfaulting in either one of these functions, though this will generally be very rare. The pattern here to return nil for a nonexistent chunk is also useful elsewhere, so this change introduces tryChunkOf which won't throw, but might return nil. It also updates the documentation of chunkOf. Fixes #41296. Change-Id: Id5ae0ca3234480de1724fdf2e3677eeedcf76fa0 Reviewed-on: https://go-review.googlesource.com/c/go/+/253777 Run-TryBot: Michael Knyszek <email@example.com> Reviewed-by: Keith Randall <firstname.lastname@example.org> TryBot-Result: Gobot Gobot <email@example.com>
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