commit | c1730ae424449f38ea4523207a56c23b2536a5de | [log] [tgz] |
---|---|---|
author | Austin Clements <austin@google.com> | Tue Jan 17 21:58:10 2017 -0500 |
committer | Austin Clements <austin@google.com> | Wed Jan 18 15:40:33 2017 +0000 |
tree | 07ad680443e80615ab7436a8ff7e1483e87a4d16 | |
parent | d10eddcba3e2cc90a822d80e7162f74501141eb8 [diff] |
runtime: force workers out before checking mark roots Currently we check that all roots are marked as soon as gcMarkDone decides to transition from mark 1 to mark 2. However, issue #16083 indicates that there may be a race where we try to complete mark 1 while a worker is still scanning a stack, causing the root mark check to fail. We don't yet understand this race, but as a simple mitigation, move the root check to after gcMarkDone performs a ragged barrier, which will force any remaining workers to finish their current job. Updates #16083. This may "fix" it, but it would be better to understand and fix the underlying race. Change-Id: I1af9ce67bd87ade7bc2a067295d79c28cd11abd2 Reviewed-on: https://go-review.googlesource.com/35353 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org>
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