runtime: "forcegc: phase error" running program using plugin on Darwin

[laplantePierre]

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

$ go version
go version go1.21.1 darwin/arm64

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
GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/Users/laplante/Library/Caches/go-build'
GOENV='/Users/laplante/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/laplante/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='/Users/laplante/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.21.1'
GCCGO='gccgo'
AR='ar'
CC='clang'
CXX='clang++'
CGO_ENABLED='1'
GOMOD='/Users/laplante/go/src/my_main/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/97/bpckjl355hd7gprlpdk_zv4m0000gn/T/go-build4196137683=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

I have a main program:

package main

import "plugin"

func main() {
p, err := plugin.Open("../my_plugin/my_plugin.so")
if err != nil {
panic(err)
}
v, err := p.Lookup("V")
if err != nil {
panic(err)
}
f, err := p.Lookup("F")
if err != nil {
panic(err)
}
*v.(*int) = 7
f.(func())() // prints "Hello, number 7"
}

I have a my_plugin program:

package main

import "fmt"

var V int

func F() { fmt.Printf("Hello, number %d\n", V) }

What did you expect to see?

When I compile and run main program panics:

I expect a normal output. It was working but I don,t know if its the update of macos or the update of go to 1.21.1

What did you see instead?

fatal error: forcegc: phase error

goroutine 18 [running]:
runtime.throw({0x14c1c5c52?, 0x104e86f10?})
/usr/local/go/src/runtime/panic.go:1077 +0x40 fp=0x14000046790 sp=0x14000046760 pc=0x14c12a9e0
runtime.forcegchelper()
/usr/local/go/src/runtime/proc.go:319 +0x114 fp=0x140000467d0 sp=0x14000046790 pc=0x14c12dd64
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x140000467d0 sp=0x140000467d0 pc=0x14c157164
created by runtime.init.6 in goroutine 1
/usr/local/go/src/runtime/proc.go:310 +0x24

goroutine 1 [runnable]:
os.init()
/usr/local/go/src/os/dir.go:108 +0x430 fp=0x140000c3ad0 sp=0x140000c3ad0 pc=0x14c1b6a90
runtime.doInit1(0x14c2c7c20)
/usr/local/go/src/runtime/proc.go:6740 +0xd4 fp=0x140000c3c00 sp=0x140000c3ad0 pc=0x104dc76f4
runtime.doInit({0x14c2c7ee0, 0xa, 0x140000a8000?})
/usr/local/go/src/runtime/proc.go:6707 +0x38 fp=0x140000c3c20 sp=0x140000c3c00 pc=0x104dc75d8
plugin.open({0x104df0f84, 0x19})
/usr/local/go/src/plugin/plugin_dlopen.go:95 +0x520 fp=0x140000c3ea0 sp=0x140000c3c20 pc=0x104decfe0
plugin.Open(...)
/usr/local/go/src/plugin/plugin.go:80
main.main()
/Users/laplante/go/src/my_main/main.go:6 +0x30 fp=0x140000c3f30 sp=0x140000c3ea0 pc=0x104ded710
runtime.main()
/usr/local/go/src/runtime/proc.go:267 +0x2bc fp=0x140000c3fd0 sp=0x140000c3f30 pc=0x104db9a8c
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x140000c3fd0 sp=0x140000c3fd0 pc=0x104de1ac4

goroutine 2 [force gc (idle)]:
runtime.gopark(0x0?, 0x0?, 0x0?, 0x0?, 0x0?)
/usr/local/go/src/runtime/proc.go:398 +0xc8 fp=0x14000046f90 sp=0x14000046f70 pc=0x104db9eb8
runtime.goparkunlock(...)
/usr/local/go/src/runtime/proc.go:404
runtime.forcegchelper()
/usr/local/go/src/runtime/proc.go:322 +0xb8 fp=0x14000046fd0 sp=0x14000046f90 pc=0x104db9d48
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x14000046fd0 sp=0x14000046fd0 pc=0x104de1ac4
created by runtime.init.6 in goroutine 1
/usr/local/go/src/runtime/proc.go:310 +0x24

goroutine 3 [GC sweep wait]:
runtime.gopark(0x0?, 0x0?, 0x0?, 0x0?, 0x0?)
/usr/local/go/src/runtime/proc.go:398 +0xc8 fp=0x14000047760 sp=0x14000047740 pc=0x104db9eb8
runtime.goparkunlock(...)
/usr/local/go/src/runtime/proc.go:404
runtime.bgsweep(0x0?)
/usr/local/go/src/runtime/mgcsweep.go:280 +0xa0 fp=0x140000477b0 sp=0x14000047760 pc=0x104da5ad0
runtime.gcenable.func1()
/usr/local/go/src/runtime/mgc.go:200 +0x28 fp=0x140000477d0 sp=0x140000477b0 pc=0x104d9a698
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x140000477d0 sp=0x140000477d0 pc=0x104de1ac4
created by runtime.gcenable in goroutine 1
/usr/local/go/src/runtime/mgc.go:200 +0x6c

goroutine 4 [GC scavenge wait]:
runtime.gopark(0x14000070000?, 0x104e09eb0?, 0x1?, 0x0?, 0x140000031e0?)
/usr/local/go/src/runtime/proc.go:398 +0xc8 fp=0x14000047f50 sp=0x14000047f30 pc=0x104db9eb8
runtime.goparkunlock(...)
/usr/local/go/src/runtime/proc.go:404
runtime.(*scavengerState).park(0x104e883c0)
/usr/local/go/src/runtime/mgcscavenge.go:425 +0x5c fp=0x14000047f80 sp=0x14000047f50 pc=0x104da31dc
runtime.bgscavenge(0x0?)
/usr/local/go/src/runtime/mgcscavenge.go:653 +0x44 fp=0x14000047fb0 sp=0x14000047f80 pc=0x104da3754
runtime.gcenable.func2()
/usr/local/go/src/runtime/mgc.go:201 +0x28 fp=0x14000047fd0 sp=0x14000047fb0 pc=0x104d9a638
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x14000047fd0 sp=0x14000047fd0 pc=0x104de1ac4
created by runtime.gcenable in goroutine 1
/usr/local/go/src/runtime/mgc.go:201 +0xac

[ianlancetaylor]

CC @golang/runtime

[cherrymui]

@laplantePierre are you using Xcode 15? If so, see #61229. This is due to a bug in Apple's new linker. We already worked around it at Go tip, and the next Go 1.21.2 will also have a workaround (#62598). Thanks.

[mfreeman451]

Having the same issue

[sh0umik]

Having the same issue after updating Macos to 13.5.2

[aclements]

For anyone experiencing this issue, please confirm the version of Xcode and Go you're using. If it's Xcode 15, Go 1.21.2 (expected to come out Thursday) should fix this issue.

[cherrymui]

Go 1.21.2 is released yesterday and includes workarounds for bugs for the C linker in Xcode 15. Could you update to Go 1.21.2 and see if that fixes the issue? Thanks.

[gopherbot]

Timed out in state WaitingForInfo. Closing.

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