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cmd/go/internal/test: data race in (*runCache).builderRunTest [1.14 backport] #38083

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gopherbot opened this issue Mar 26, 2020 · 2 comments
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cmd/go/internal/test: data race in (*runCache).builderRunTest [1.14 backport] #38083

gopherbot opened this issue Mar 26, 2020 · 2 comments
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CherryPickApproved Used during the release process for point releases FrozenDueToAge
Milestone
Go1.14.2

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@gopherbot
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@bcmills requested issue #38077 to be considered for backport to the next 1.14 minor release.

@gopherbot, please backport to Go 1.13 and 1.14. This is a data race in cmd/go, and data races can lead to arbitrary memory corruption.
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Mar 26, 2020
@gopherbot gopherbot mentioned this issue Mar 26, 2020
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@gopherbot gopherbot added this to the Go1.14.2 milestone Mar 26, 2020
@gopherbot
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Change https://golang.org/cl/225659 mentions this issue: [release-branch.go1.14] cmd/go: do not append to the global cfg.OrigEnv slice

@andybons andybons added the CherryPickApproved Used during the release process for point releases label Mar 26, 2020
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Mar 26, 2020
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Closed by merging 612ef03 to release-branch.go1.14.

gopherbot pushed a commit that referenced this issue Mar 26, 2020
@andybons
[release-branch.go1.14] cmd/go: do not append to the global cfg.OrigE…
612ef03 
…nv slice

Appending to a global slice is only safe if its length is already
equal to its capacity. That property is not guaranteed for slices in
general, and empirically does not hold for this one.

This is a minimal fix to make it easier to backport.
A more robust cleanup of the base.EnvForDir function will be sent in a
subsequent CL.

Fixes #38083
Updates #38077

Change-Id: I731d5bbd0e516642c2cf43e713eeea15402604e5
Reviewed-on: https://go-review.googlesource.com/c/go/+/225577
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jay Conrod <jayconrod@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>
(cherry picked from commit bfb1342)
Reviewed-on: https://go-review.googlesource.com/c/go/+/225659
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