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reflect: panic from malloc after MakeFunc function returns value that is also stored globally [1.13 backport] #39697

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gopherbot opened this issue Jun 18, 2020 · 3 comments
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reflect: panic from malloc after MakeFunc function returns value that is also stored globally [1.13 backport] #39697

gopherbot opened this issue Jun 18, 2020 · 3 comments
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CherryPickApproved Used during the release process for point releases FrozenDueToAge
Milestone
Go1.13.14

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@gopherbot
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@randall77 requested issue #39541 to be considered for backport to the next 1.13 minor release.

@gopherbot please open backport issues for 1.14 and 1.13.
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Jun 18, 2020
@gopherbot gopherbot mentioned this issue Jun 18, 2020
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@gopherbot gopherbot added this to the Go1.13.13 milestone Jun 18, 2020
@randall77
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This issue is pretty rare, but causes random GC crashes when it does happen. Seems worth backporting.

@ianlancetaylor ianlancetaylor added the CherryPickApproved Used during the release process for point releases label Jun 19, 2020
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Jun 19, 2020
@gopherbot
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Change https://golang.org/cl/238862 mentions this issue: [release-branch.go1.13] reflect: zero stack slots before writing to them with write barriers

gopherbot pushed a commit that referenced this issue Jul 11, 2020
@randall77 @dmitshur
[release-branch.go1.13] reflect: zero stack slots before writing to t…
3c1722c 
…hem with write barriers

reflect.assignTo writes to the target using write barriers. Make sure
that the memory it is writing to is zeroed, so the write barrier does
not read pointers from uninitialized memory.

Fixes #39697

Change-Id: Ia64b2cacc193bffd0c1396bbce1dfb8182d4905b
Reviewed-on: https://go-review.googlesource.com/c/go/+/238760
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
(cherry picked from commit 3dec253)
Reviewed-on: https://go-review.googlesource.com/c/go/+/238862
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
@gopherbot
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Closed by merging 3c1722c to release-branch.go1.13.

@andybons andybons modified the milestones: Go1.13.13, Go1.13.14 Jul 14, 2020
@golang golang locked and limited conversation to collaborators Jul 14, 2021
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