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plugin: variable not initialized properly [1.21 backport] #62505

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gopherbot opened this issue Sep 7, 2023 · 2 comments
Closed

plugin: variable not initialized properly [1.21 backport] #62505

gopherbot opened this issue Sep 7, 2023 · 2 comments
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CherryPickApproved Used during the release process for point releases compiler/runtime Issues related to the Go compiler and/or runtime.
Milestone
Go1.21.2

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@gopherbot
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@cherrymui requested issue #62430 to be considered for backport to the next 1.21 minor release.

@gopherbot please backport this to Go 1.21. This is a regression that causes valid programs to run incorrectly.
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Sep 7, 2023
@gopherbot gopherbot mentioned this issue Sep 7, 2023
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@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Sep 7, 2023
@gopherbot gopherbot added this to the Go1.21.2 milestone Sep 7, 2023
@gopherbot
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Change https://go.dev/cl/526575 mentions this issue: cmd/link: avoid deadcode of global map vars for programs using plugins

@dmitshur dmitshur added CherryPickApproved Used during the release process for point releases and removed CherryPickCandidate Used during the release process for point releases labels Sep 20, 2023
gopherbot pushed a commit that referenced this issue Sep 20, 2023
@thanm
[release-branch.go1.21] cmd/link: avoid deadcode of global map vars f…
556e9c3 
…or programs using plugins

If a program imports the plugin package, the mechanisms in place for
detecting and deleting unused global map variables are no longer safe,
since it's possibly for a given global map var to be unreferenced in
the main program but referenced by a plugin. This patch changes the
linker to test for plugin use and to avoid removing any unused global
map variables if the main program could possibly load up a plugin.

Fixes #62505.
Updates #62430.

Change-Id: Ie00b18b681cb0d259e3c859ac947ade5778cd6c8
(cherry picked from commit 660620d)
Reviewed-on: https://go-review.googlesource.com/c/go/+/526575
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
@gopherbot
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Closed by merging 556e9c3 to release-branch.go1.21.

bradfitz pushed a commit to tailscale/go that referenced this issue Sep 25, 2023
@thanm @bradfitz
[release-branch.go1.21] cmd/link: avoid deadcode of global map vars f…
6c13ef5 
…or programs using plugins

If a program imports the plugin package, the mechanisms in place for
detecting and deleting unused global map variables are no longer safe,
since it's possibly for a given global map var to be unreferenced in
the main program but referenced by a plugin. This patch changes the
linker to test for plugin use and to avoid removing any unused global
map variables if the main program could possibly load up a plugin.

Fixes golang#62505.
Updates golang#62430.

Change-Id: Ie00b18b681cb0d259e3c859ac947ade5778cd6c8
(cherry picked from commit 660620d)
Reviewed-on: https://go-review.googlesource.com/c/go/+/526575
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
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Labels
CherryPickApproved Used during the release process for point releases compiler/runtime Issues related to the Go compiler and/or runtime.
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Go1.21.2
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