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cmd/compile: panic with unreachable recover() #48459

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mattn opened this issue Sep 18, 2021 · 1 comment
Closed

cmd/compile: panic with unreachable recover() #48459

mattn opened this issue Sep 18, 2021 · 1 comment
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@mattn
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@mattn mattn commented Sep 18, 2021

What version of Go are you using (go version)?

$ go version
go version devel go1.18-c894b442d1 Sat Sep 18 06:04:41 2021 +0000 windows/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
set GO111MODULE=on
set GOARCH=amd64
set GOBIN=
set GOCACHE=C:\Users\mattn\AppData\Local\go-build
set GOENV=C:\Users\mattn\AppData\Roaming\go\env
set GOEXE=.exe
set GOEXPERIMENT=
set GOFLAGS=
set GOHOSTARCH=amd64
set GOHOSTOS=windows
set GOINSECURE=
set GOMODCACHE=C:\Users\mattn\go\pkg\mod
set GONOPROXY=
set GONOSUMDB=
set GOOS=windows
set GOPATH=C:\Users\mattn\go
set GOPRIVATE=
set GOPROXY=https://proxy.golang.org,direct
set GOROOT=C:\dev\go
set GOSUMDB=sum.golang.org
set GOTMPDIR=
set GOTOOLDIR=C:\dev\go\pkg\tool\windows_amd64
set GOVCS=
set GOVERSION=devel go1.18-c894b442d1 Sat Sep 18 06:04:41 2021 +0000
set GCCGO=gccgo
set GOAMD64=v1
set AR=ar
set CC=gcc
set CXX=g++
set CGO_ENABLED=1
set GOMOD=C:\Users\mattn\go\src\github.com\mattn\iii\go.mod
set CGO_CFLAGS=-g -O2
set CGO_CPPFLAGS=
set CGO_CXXFLAGS=-g -O2
set CGO_FFLAGS=-g -O2
set CGO_LDFLAGS=-g -O2
set PKG_CONFIG=pkg-config
set GOGCCFLAGS=-m64 -mthreads -fmessage-length=0 -fdebug-prefix-map=C:\Users\mattn\AppData\Local\Temp\go-build405125501=/tmp/go-build -gno-record-gcc-switches

What did you do?

package main

func main() {
	if true {
		return
	}

	defer func() {
		recover()
	}()
}

This is not reproduced on Go playground.

https://play.golang.org/p/gru0RzZcLGh

What did you expect to see?

Compilation successfully.

What did you see instead?

# command-line-arguments
.\main.go:9:10: internal compiler error: order.stmt recover

goroutine 1 [running]:
runtime/debug.Stack()
	C:/dev/go/src/runtime/debug/stack.go:24 +0x65
cmd/compile/internal/base.FatalfAt({0xbf2078, 0x0}, {0xa8194d, 0xd}, {0xc00058d998, 0x1, 0x1})
	C:/dev/go/src/cmd/compile/internal/base/print.go:227 +0x154
cmd/compile/internal/base.Fatalf(...)
	C:/dev/go/src/cmd/compile/internal/base/print.go:196
cmd/compile/internal/walk.(*orderState).stmt(0xc000686040, {0xbf2078, 0xc000402090})
	C:/dev/go/src/cmd/compile/internal/walk/order.go:602 +0x281e
cmd/compile/internal/walk.(*orderState).stmtList(0xa4f5a0, {0xc00005e1b0, 0x1, 0x1})
	C:/dev/go/src/cmd/compile/internal/walk/order.go:397 +0x85
cmd/compile/internal/walk.orderBlock(0xc000074430, 0xc000696060)
	C:/dev/go/src/cmd/compile/internal/walk/order.go:460 +0x85
cmd/compile/internal/walk.order(0xc000074420)
	C:/dev/go/src/cmd/compile/internal/walk/order.go:66 +0x9b
cmd/compile/internal/walk.Walk(0xc000074420)
	C:/dev/go/src/cmd/compile/internal/walk/walk.go:27 +0x4d
cmd/compile/internal/gc.prepareFunc(0xc000074420)
	C:/dev/go/src/cmd/compile/internal/gc/compile.go:92 +0x6d
cmd/compile/internal/gc.enqueueFunc(0xc000074420)
	C:/dev/go/src/cmd/compile/internal/gc/compile.go:66 +0x2fd
cmd/compile/internal/gc.Main(0xaad238)
	C:/dev/go/src/cmd/compile/internal/gc/main.go:303 +0xe94
main.main()
	C:/dev/go/src/cmd/compile/main.go:55 +0xdd

@seankhliao seankhliao changed the title panic with unreachable recover() cmd/compile: panic with unreachable recover() Sep 18, 2021
@cuonglm cuonglm self-assigned this Sep 18, 2021
@cuonglm cuonglm added this to the Go1.18 milestone Sep 18, 2021
@gopherbot
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@gopherbot gopherbot commented Sep 18, 2021

Change https://golang.org/cl/350695 mentions this issue: cmd/compile: fix missing markHiddenClosureDead in deadcode pass

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@gopherbot gopherbot closed this in 771b8ea Sep 19, 2021
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