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cmd/compile: internal compiler error: panic with range over integer value #67141

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mmp opened this issue May 2, 2024 · 11 comments
Closed

cmd/compile: internal compiler error: panic with range over integer value #67141

mmp opened this issue May 2, 2024 · 11 comments
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@griesemer
Labels
compiler/runtime Issues related to the Go compiler and/or runtime. FixPending Issues that have a fix which has not yet been reviewed or submitted. NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.23

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@mmp
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mmp commented May 2, 2024

Go version

go version go1.22.2 darwin/arm64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/Users/mmp/Library/Caches/go-build'
GOENV='/Users/mmp/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/mmp/go/pkg/mod'
GONOPROXY='github.com/mmp/vatce'
GONOSUMDB='github.com/mmp/vatce'
GOOS='darwin'
GOPATH='/Users/mmp/go'
GOPRIVATE='github.com/mmp/vatce'
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/opt/homebrew/Cellar/go/1.22.2/libexec'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/opt/homebrew/Cellar/go/1.22.2/libexec/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.22.2'
GCCGO='gccgo'
AR='ar'
CC='cc'
CXX='c++'
CGO_ENABLED='1'
GOMOD='/Users/mmp/bork/go.mod'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/d9/9chq958s5sq76cb02ws8cgkr0000gp/T/go-build2438242053=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

% go build .

Repo: bork.zip

I have determined that changing line 412 of fonts.go from:

for j := range glyph.Bounds[0]

to

for j := 0; j < glyph.Bounds[0]; j++ {

makes the compiler stop crashing.

What did you see happen?

% go build .
# github.com/mmp/imgui-go/v4
warning: unknown warning option '-Wno-subobject-linkage' [-Wunknown-warning-option]
# github.com/mmp/vice
<unknown line number>: internal compiler error: panic: runtime error: invalid memory address or nil pointer dereference

Please file a bug report including a short program that triggers the error.
https://go.dev/issue/new
%

What did you expect to see?

Successful compilation of my program.
@seankhliao seankhliao changed the title pkg/tool/compile: internal compiler error: panic with range over integer value cmd/compile: internal compiler error: panic with range over integer value May 2, 2024
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label May 2, 2024
@seankhliao
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stacktrace:

<unknown line number>: internal compiler error: panic: runtime error: invalid memory address or nil pointer dereference

goroutine 1 [running]:
runtime/debug.Stack()
	../../../sdk/gotip/src/runtime/debug/stack.go:26 +0x5e
cmd/compile/internal/base.FatalfAt({0x6c22e40?, 0xc0?}, {0xe021ac, 0x9}, {0xc006c22e70, 0x1, 0x1})
	../../../sdk/gotip/src/cmd/compile/internal/base/print.go:225 +0x1d7
cmd/compile/internal/base.Fatalf(...)
	../../../sdk/gotip/src/cmd/compile/internal/base/print.go:194
cmd/compile/internal/gc.handlePanic()
	../../../sdk/gotip/src/cmd/compile/internal/gc/main.go:52 +0x90
panic({0xd7dd20?, 0x148b970?})
	../../../sdk/gotip/src/runtime/panic.go:759 +0x132
cmd/compile/internal/types2.(*Checker).handleBailout(0xc000102380, 0xc006c27150)
	../../../sdk/gotip/src/cmd/compile/internal/types2/check.go:373 +0x88
panic({0xd7dd20?, 0x148b970?})
	../../../sdk/gotip/src/runtime/panic.go:759 +0x132
cmd/compile/internal/noder.checkFiles.func1({0xf67240?, 0xc004c8d300?})
	../../../sdk/gotip/src/cmd/compile/internal/noder/irgen.go:80 +0x209
cmd/compile/internal/types2.(*Checker).handleError(0xc000102380, 0x0, {0xc0004d7410?, 0x62a101?, 0xc0?}, 0x6d, {0xc000d9e6c0, 0x52}, 0x1)
	../../../sdk/gotip/src/cmd/compile/internal/types2/errors.go:206 +0x3de
cmd/compile/internal/types2.(*error_).report(0xc006c23378)
	../../../sdk/gotip/src/cmd/compile/internal/types2/errors.go:147 +0x21b
cmd/compile/internal/types2.(*Checker).softErrorf(0xe1454e?, {0xf67500?, 0xc004c8d200?}, 0xf6bf10?, {0xe14536?, 0x14aaa80?}, {0xc006c23558?, 0x147dec0?, 0xf68088?})
	../../../sdk/gotip/src/cmd/compile/internal/types2/errors.go:235 +0x7c
cmd/compile/internal/types2.(*Checker).rangeStmt(0xc000102380, 0x3, 0xc000629450, 0xf68088?)
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:865 +0x4dd
cmd/compile/internal/types2.(*Checker).stmt(0xc000102380, 0x3, {0xf6a170, 0xc000629450})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:642 +0x534
cmd/compile/internal/types2.(*Checker).stmtList(0xc000102380, 0x3, {0xc0001a1c20?, 0xdfb9e8?, 0x5?})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:120 +0x85
cmd/compile/internal/types2.(*Checker).stmt(0xc000102380, 0x3, {0xf69f78, 0xc000621040})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:554 +0x7c5
cmd/compile/internal/types2.(*Checker).rangeStmt(0xc000102380, 0x3, 0xc000629220, 0xc000620f40?)
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:975 +0x72d
cmd/compile/internal/types2.(*Checker).stmt(0xc000102380, 0x3, {0xf6a170, 0xc000629220})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:642 +0x534
cmd/compile/internal/types2.(*Checker).stmtList(0xc000102380, 0x3, {0xc000621240?, 0xdfb9e8?, 0x5?})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:120 +0x85
cmd/compile/internal/types2.(*Checker).stmt(0xc000102380, 0x3, {0xf69f78, 0xc000620f00})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:554 +0x7c5
cmd/compile/internal/types2.(*Checker).rangeStmt(0xc000102380, 0x3, 0xc000628be0, 0xf700c0?)
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:975 +0x72d
cmd/compile/internal/types2.(*Checker).stmt(0xc000102380, 0x3, {0xf6a170, 0xc000628be0})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:642 +0x534
cmd/compile/internal/types2.(*Checker).stmtList(0xc000102380, 0x3, {0xc0006212c0?, 0xdfb9e8?, 0x5?})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:120 +0x85
cmd/compile/internal/types2.(*Checker).stmt(0xc000102380, 0x3, {0xf69f78, 0xc000620e40})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:554 +0x7c5
cmd/compile/internal/types2.(*Checker).rangeStmt(0xc000102380, 0x3, 0xc000628910, 0xf700c0?)
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:975 +0x72d
cmd/compile/internal/types2.(*Checker).stmt(0xc000102380, 0x0, {0xf6a170, 0xc000628910})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:642 +0x534
cmd/compile/internal/types2.(*Checker).stmtList(...)
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:120
cmd/compile/internal/types2.(*Checker).funcBody(0xc000102380, 0xc00060d9e0?, {0xc0001dac48?, 0xc0004d6c60?}, 0xc0067ccc40, 0xc000620d00, {0x0?, 0x0?})
	../../../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:40 +0x34c
cmd/compile/internal/types2.(*Checker).funcDecl.func1()
	../../../sdk/gotip/src/cmd/compile/internal/types2/decl.go:784 +0x3a
cmd/compile/internal/types2.(*Checker).processDelayed(0xc000102380, 0x0)
	../../../sdk/gotip/src/cmd/compile/internal/types2/check.go:471 +0x19c
cmd/compile/internal/types2.(*Checker).checkFiles(0xc000102380, {0xc00353a000, 0x1d, 0x1d})
	../../../sdk/gotip/src/cmd/compile/internal/types2/check.go:417 +0xd6
cmd/compile/internal/types2.(*Checker).Files(0x7ffc4b68327a?, {0xc00353a000?, 0x0?, 0x0?})
	../../../sdk/gotip/src/cmd/compile/internal/types2/check.go:391 +0x85
cmd/compile/internal/types2.(*Config).Check(0xc0001300e0, {0x7ffc4b68327a?, 0xc000012137?}, {0xc00353a000, 0x1d, 0x1d}, 0xc003534840)
	../../../sdk/gotip/src/cmd/compile/internal/types2/api.go:476 +0x66
cmd/compile/internal/noder.checkFiles({0x0, {0x0, 0x0}}, {0xc0004d4000, 0x1d, 0x0?})
	../../../sdk/gotip/src/cmd/compile/internal/noder/irgen.go:91 +0x5c9
cmd/compile/internal/noder.writePkgStub({0x0?, {0x0?, 0x0?}}, {0xc0004d4000, 0x1d, 0x1d})
	../../../sdk/gotip/src/cmd/compile/internal/noder/unified.go:304 +0x6a
cmd/compile/internal/noder.unified({0x0?, {0x0?, 0x0?}}, {0xc0004d4000?, 0xd45cc0?, 0x0?})
	../../../sdk/gotip/src/cmd/compile/internal/noder/unified.go:180 +0x9a
cmd/compile/internal/noder.LoadPackage({0xc0001ba0f8, 0x1d, 0x20})
	../../../sdk/gotip/src/cmd/compile/internal/noder/noder.go:77 +0x43a
cmd/compile/internal/gc.Main(0xe3bec0)
	../../../sdk/gotip/src/cmd/compile/internal/gc/main.go:197 +0xbbd
main.main()
	../../../sdk/gotip/src/cmd/compile/main.go:57 +0xf9

@seankhliao seankhliao added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label May 2, 2024
@dmitshur dmitshur added this to the Go1.23 milestone May 15, 2024
@dmitshur dmitshur moved this to In Progress in Go Compiler / Runtime May 15, 2024
@griesemer
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I cannot reproduce this, neither at go1.22.3 nor at tip (haven't tried go1.22.2). In both cases, the build terminates.
The offending for statement (playground) also works fine stand-alone.
Can you please try this again with the latest version of go1.22, or if you don't mind, at tip?

I'm going to close this for now as not reproducible, but feel free to reopen if you still see the problem with up-to-date compilers. If you see the problem, it would be helpful if you could reduced the source to a (ideally small) snippet of code.

@github-project-automation github-project-automation bot moved this from In Progress to Done in Go Compiler / Runtime May 16, 2024
@mmp
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mmp commented May 16, 2024

I'm still seeing it here with 1.22.3 as well as with gotip at

HEAD is now at 78e50d0 crypto/tls: don't call tlsrsakex.IncNonDefault with FIPS

And yes, I couldn't come up with a small repo case in the playground, so unfortunately it's this big blob of code.

The stacktrace I get with gotip is similar to the one that @seankhliao posted; the one I got is copied below. Let me know if I can help with further digging here...

% gotip build .
# github.com/mmp/imgui-go/v4
warning: unknown warning option '-Wno-subobject-linkage' [-Wunknown-warning-option]
# github.com/mmp/vice
<unknown line number>: internal compiler error: panic: runtime error: invalid memory address or nil pointer dereference

goroutine 1 [running]:
runtime/debug.Stack()
	../sdk/gotip/src/runtime/debug/stack.go:26 +0x64
cmd/compile/internal/base.FatalfAt({0x3a2ed88?, 0x140?}, {0x103051deb, 0x9}, {0x14003a2edb8, 0x1, 0x1})
	../sdk/gotip/src/cmd/compile/internal/base/print.go:230 +0x20c
cmd/compile/internal/base.Fatalf(...)
	../sdk/gotip/src/cmd/compile/internal/base/print.go:195
cmd/compile/internal/gc.handlePanic()
	../sdk/gotip/src/cmd/compile/internal/gc/main.go:53 +0x8c
panic({0x10329b500?, 0x1039710d0?})
	../sdk/gotip/src/runtime/panic.go:759 +0x124
cmd/compile/internal/types2.(*Checker).handleBailout(0x14000482380, 0x14003a33158)
	../sdk/gotip/src/cmd/compile/internal/types2/check.go:390 +0x9c
panic({0x10329b500?, 0x1039710d0?})
	../sdk/gotip/src/runtime/panic.go:759 +0x124
cmd/compile/internal/noder.checkFiles.func1({0x103350600?, 0x1400512a4c0?})
	../sdk/gotip/src/cmd/compile/internal/noder/irgen.go:78 +0x1b0
cmd/compile/internal/types2.(*Checker).handleError(0x14000482380, 0x0, {0x14000a7aa80?, 0xd27200?, 0x140?}, 0x6d, {0x14000138f60, 0x52}, 0x1)
	../sdk/gotip/src/cmd/compile/internal/types2/errors.go:206 +0x304
cmd/compile/internal/types2.(*error_).report(0x14003a2f2e8)
	../sdk/gotip/src/cmd/compile/internal/types2/errors.go:147 +0x1f4
cmd/compile/internal/types2.(*Checker).softErrorf(0x1030664fc?, {0x103350900?, 0x1400512a3c0?}, 0x1033575d0?, {0x1030664e4?, 0x4000?}, {0x14003a2f4d8?, 0x103352548?, 0x14006ac9d60?})
	../sdk/gotip/src/cmd/compile/internal/types2/errors.go:235 +0x70
cmd/compile/internal/types2.(*Checker).rangeStmt(0x14000482380, 0x3, 0x14000d32a00, 0x0?)
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:865 +0x3dc
cmd/compile/internal/types2.(*Checker).stmt(0x14000482380, 0x3, {0x103355130, 0x14000d32a00})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:642 +0x43c
cmd/compile/internal/types2.(*Checker).stmtList(0x14000482380, 0x3, {0x14000a6d150?, 0x10304b0ee?, 0x5?})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:120 +0x88
cmd/compile/internal/types2.(*Checker).stmt(0x14000482380, 0x3, {0x103354f38, 0x14000d29080})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:554 +0x628
cmd/compile/internal/types2.(*Checker).rangeStmt(0x14000482380, 0x3, 0x14000d327d0, 0x14000d28f80?)
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:988 +0x550
cmd/compile/internal/types2.(*Checker).stmt(0x14000482380, 0x3, {0x103355130, 0x14000d327d0})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:642 +0x43c
cmd/compile/internal/types2.(*Checker).stmtList(0x14000482380, 0x3, {0x14000d29280?, 0x10304b0ee?, 0x5?})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:120 +0x88
cmd/compile/internal/types2.(*Checker).stmt(0x14000482380, 0x3, {0x103354f38, 0x14000d28f40})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:554 +0x628
cmd/compile/internal/types2.(*Checker).rangeStmt(0x14000482380, 0x3, 0x14000d32190, 0x10335bde0?)
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:988 +0x550
cmd/compile/internal/types2.(*Checker).stmt(0x14000482380, 0x3, {0x103355130, 0x14000d32190})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:642 +0x43c
cmd/compile/internal/types2.(*Checker).stmtList(0x14000482380, 0x3, {0x14000d29300?, 0x10304b0ee?, 0x5?})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:120 +0x88
cmd/compile/internal/types2.(*Checker).stmt(0x14000482380, 0x3, {0x103354f38, 0x14000d28e80})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:554 +0x628
cmd/compile/internal/types2.(*Checker).rangeStmt(0x14000482380, 0x3, 0x14000d31e00, 0x10335bde0?)
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:988 +0x550
cmd/compile/internal/types2.(*Checker).stmt(0x14000482380, 0x0, {0x103355130, 0x14000d31e00})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:642 +0x43c
cmd/compile/internal/types2.(*Checker).stmtList(...)
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:120
cmd/compile/internal/types2.(*Checker).funcBody(0x14000482380, 0x14000d26b40?, {0x140006314d0?, 0x14000a7a2d0?}, 0x140014ace00, 0x14000d28d40, {0x0?, 0x0?})
	../sdk/gotip/src/cmd/compile/internal/types2/stmt.go:40 +0x268
cmd/compile/internal/types2.(*Checker).funcDecl.func1()
	../sdk/gotip/src/cmd/compile/internal/types2/decl.go:784 +0x44
cmd/compile/internal/types2.(*Checker).processDelayed(...)
	../sdk/gotip/src/cmd/compile/internal/types2/check.go:502
cmd/compile/internal/types2.(*Checker).checkFiles(0x14000482380, {0x14003352000, 0x1d, 0x1d})
	../sdk/gotip/src/cmd/compile/internal/types2/check.go:448 +0x6ec
cmd/compile/internal/types2.(*Checker).Files(0x16d782a6f?, {0x14003352000?, 0x0?, 0x0?})
	../sdk/gotip/src/cmd/compile/internal/types2/check.go:408 +0x80
cmd/compile/internal/types2.(*Config).Check(0x140004b5ea0, {0x16d782a6f?, 0x140000101c7?}, {0x14003352000, 0x1d, 0x1d}, 0x1400334acc0)
	../sdk/gotip/src/cmd/compile/internal/types2/api.go:480 +0x68
cmd/compile/internal/noder.checkFiles({0x0, {0x0, 0x0}}, {0x14000434000, 0x1d, 0x140000769a0?})
	../sdk/gotip/src/cmd/compile/internal/noder/irgen.go:89 +0x4ac
cmd/compile/internal/noder.writePkgStub({0x0?, {0x0?, 0x0?}}, {0x14000434000, 0x1d, 0x1d})
	../sdk/gotip/src/cmd/compile/internal/noder/unified.go:307 +0x48
cmd/compile/internal/noder.unified({0x0?, {0x0?, 0x0?}}, {0x14000434000?, 0x10324cf20?, 0x0?})
	../sdk/gotip/src/cmd/compile/internal/noder/unified.go:183 +0x98
cmd/compile/internal/noder.LoadPackage({0x14000020408, 0x1d, 0x1f})
	../sdk/gotip/src/cmd/compile/internal/noder/noder.go:77 +0x398
cmd/compile/internal/gc.Main(0x10334aa20)
	../sdk/gotip/src/cmd/compile/internal/gc/main.go:200 +0xb40
main.main()
	../sdk/gotip/src/cmd/compile/main.go:57 +0x110

@mmp
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mmp commented May 16, 2024

(I'm unable to reopen the bug myself, it seems.)

@griesemer
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Reopened for further investigation.

@griesemer griesemer reopened this May 16, 2024
@github-project-automation github-project-automation bot moved this from Done to In Progress in Go Compiler / Runtime May 16, 2024
@mmp
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mmp commented May 16, 2024

I've made some progress that may give some useful clues while working to boil this down to a smaller repro case. Once I got it down to a single file, I got the helpful error message:

./repro.go:289:20: cannot range over glyph.Bounds[0] (variable of type int): requires go1.22 or later (-lang was set to go1.21; check go.mod)

and indeed, the go.mod file has:

go 1.21.4

If I modify go.mod to make that go 1.22.3, then the original test case builds fine.

This seems to track with the panic coming from:

	../sdk/gotip/src/cmd/compile/internal/noder/irgen.go:78 +0x1b0

which is if file.GoVersion == fileVersion. Presumably something about the multi-file repro case is leading to file being nil where it isn't for a single file repro?

@mmp
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mmp commented May 16, 2024 •
edited
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Scratch that about multi-files. Attached is a single-file, 27 line repro case. Note that go.mod has go 1.21.4 and with that, the compiler crashes (both 1.22.3 and gotip). Changing to go 1.22.3 in go.mod causes the error to be properly issued.

Now, you might notice an import "C" at the top of the repro case. There's no need for that here, and if you remove that, the error is also properly issued, even with go 1.21.4 in go.mod. So that's quite "interesting"...

bork5.zip

@griesemer
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griesemer commented May 16, 2024 •
edited
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@mmp Excellent! Thanks for narrowing this down. Simplified repro:

package p

import "C"

func _() {
	for range 10 {
	}
}

I can reproduce this. Fix forthcoming later today.

@gopherbot
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Change https://go.dev/cl/586238 mentions this issue: cmd/compile: initialize posBaseMap correctly

@griesemer
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@gopherbot please consider this for backport to 1.22 and 1.21.

@gopherbot gopherbot mentioned this issue May 17, 2024
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@gopherbot
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gopherbot commented May 17, 2024 •
edited by dmitshur
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Backport issue(s) opened: #67459 (for 1.21), #67460 (for 1.22).

Remember to create the cherry-pick CL(s) as soon as the patch is submitted to master, according to https://go.dev/wiki/MinorReleases.

@gopherbot gopherbot mentioned this issue May 17, 2024
Closed
@dmitshur dmitshur added NeedsFix The path to resolution is known, but the work has not been done. FixPending Issues that have a fix which has not yet been reviewed or submitted. and removed NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels May 18, 2024
@cuonglm cuonglm mentioned this issue May 20, 2024
Closed
@github-project-automation github-project-automation bot moved this from In Progress to Done in Go Compiler / Runtime May 20, 2024
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compiler/runtime Issues related to the Go compiler and/or runtime. FixPending Issues that have a fix which has not yet been reviewed or submitted. NeedsFix The path to resolution is known, but the work has not been done.
Projects
Go Compiler / Runtime
Status: Done
Milestone
Go1.23
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@mmp @dmitshur @griesemer @gopherbot @seankhliao