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runtime: race between stack shrinking and channel send/recv leads to bad sudog values [1.14 backport] #40642

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gopherbot opened this issue Aug 7, 2020 · 2 comments

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@gopherbot
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@gopherbot gopherbot commented Aug 7, 2020

@mknyszek requested issue #40641 to be considered for backport to the next 1.14 minor release.

This should be fixed for Go 1.14 and Go 1.15. It's a bug that was introduced in Go 1.14, and may cause random and unavoidable crashes at any point in time. There may not be enough time to fix this for 1.15 (the failure is very rare, but we've seen it internally), and if not, it should definitely go in a point release.

@gopherbot please open a backport issue for 1.14.

@gopherbot
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@gopherbot gopherbot commented Aug 10, 2020

Change https://golang.org/cl/247680 mentions this issue: [release-branch.go1.14] Revert "runtime: make copystack/sudog synchronization more explicit"

@dmitshur dmitshur modified the milestones: Go1.14.8, Go1.14.9 Sep 1, 2020
@dmitshur dmitshur modified the milestones: Go1.14.9, Go1.14.10 Sep 9, 2020
@gopherbot
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@gopherbot gopherbot commented Sep 21, 2020

Change https://golang.org/cl/256301 mentions this issue: [release-branch.go1.14] runtime: disable stack shrinking in activeStackChans race window

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