Go 1.21.0 panics on macos ventura 13.5.2

[Pierre Laplante]

main.go:

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"
}

my_plugin

package main

import "fmt"

var V int

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

go version

go version go1.21.1 darwin/arm64

Running make planic with:

fatal error: forcegc: phase error

goroutine 5 [running]:
runtime.throw({0x129d8dc52?, 0x102a4ef10?})
/usr/local/go/src/runtime/panic.go:1077 +0x40 fp=0x14000046790 sp=0x14000046760 pc=0x129cf29e0
runtime.forcegchelper()
/usr/local/go/src/runtime/proc.go:319 +0x114 fp=0x140000467d0 sp=0x14000046790 pc=0x129cf5d64
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x140000467d0 sp=0x140000467d0 pc=0x129d1f164
created by runtime.init.6 in goroutine 1
/usr/local/go/src/runtime/proc.go:310 +0x24

goroutine 1 [runnable]:
os.NewFile(0x1?, {0x129d8c228?, 0xb?})
/usr/local/go/src/os/file_unix.go:105 +0xb8 fp=0x1400011faa0 sp=0x1400011faa0 pc=0x129d7d1c8
os.init()
/usr/local/go/src/os/file.go:66 +0x310 fp=0x1400011fad0 sp=0x1400011faa0 pc=0x129d7e970
runtime.doInit1(0x129e8fc20)
/usr/local/go/src/runtime/proc.go:6740 +0xd4 fp=0x1400011fc00 sp=0x1400011fad0 pc=0x10298f6f4
runtime.doInit({0x129e8fee0, 0xa, 0x1400001e0f0?})
/usr/local/go/src/runtime/proc.go:6707 +0x38 fp=0x1400011fc20 sp=0x1400011fc00 pc=0x10298f5d8
plugin.open({0x1029b8f84, 0x19})
/usr/local/go/src/plugin/plugin_dlopen.go:95 +0x520 fp=0x1400011fea0 sp=0x1400011fc20 pc=0x1029b4fe0
plugin.Open(...)
/usr/local/go/src/plugin/plugin.go:80
main.main()
/Users/laplante/go/src/my_main/main.go:6 +0x30 fp=0x1400011ff30 sp=0x1400011fea0 pc=0x1029b5710
runtime.main()
/usr/local/go/src/runtime/proc.go:267 +0x2bc fp=0x1400011ffd0 sp=0x1400011ff30 pc=0x102981a8c
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x1400011ffd0 sp=0x1400011ffd0 pc=0x1029a9ac4

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=0x102981eb8
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=0x102981d48
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x14000046fd0 sp=0x14000046fd0 pc=0x1029a9ac4
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=0x102981eb8
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=0x10296dad0
runtime.gcenable.func1()
/usr/local/go/src/runtime/mgc.go:200 +0x28 fp=0x140000477d0 sp=0x140000477b0 pc=0x102962698
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x140000477d0 sp=0x140000477d0 pc=0x1029a9ac4
created by runtime.gcenable in goroutine 1
/usr/local/go/src/runtime/mgc.go:200 +0x6c

goroutine 4 [GC scavenge wait]:
runtime.gopark(0x14000070000?, 0x1029d1eb0?, 0x1?, 0x0?, 0x140000031e0?)
/usr/local/go/src/runtime/proc.go:398 +0xc8 fp=0x14000047f50 sp=0x14000047f30 pc=0x102981eb8
runtime.goparkunlock(...)
/usr/local/go/src/runtime/proc.go:404
runtime.(*scavengerState).park(0x102a503c0)
/usr/local/go/src/runtime/mgcscavenge.go:425 +0x5c fp=0x14000047f80 sp=0x14000047f50 pc=0x10296b1dc
runtime.bgscavenge(0x0?)
/usr/local/go/src/runtime/mgcscavenge.go:653 +0x44 fp=0x14000047fb0 sp=0x14000047f80 pc=0x10296b754
runtime.gcenable.func2()
/usr/local/go/src/runtime/mgc.go:201 +0x28 fp=0x14000047fd0 sp=0x14000047fb0 pc=0x102962638
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x14000047fd0 sp=0x14000047fd0 pc=0x1029a9ac4
created by runtime.gcenable in goroutine 1
/usr/local/go/src/runtime/mgc.go:201 +0xac

goroutine 6 [runnable]:
runtime.runfinq()
/usr/local/go/src/runtime/mfinal.go:176 fp=0x140000487d0 sp=0x140000487d0 pc=0x129cd4db0
runtime.goexit()
/usr/local/go/src/runtime/asm_arm64.s:1197 +0x4 fp=0x140000487d0 sp=0x140000487d0 pc=0x129d1f164
created by runtime.createfing in goroutine 1
/usr/local/go/src/runtime/mfinal.go:163 +0x84

[Ian Lance Taylor]

On Thu, Sep 21, 2023 at 2:16 PM Pierre Laplante <lapla...@gmail.com> wrote:
>
> Running make planic with:
>
> fatal error: forcegc: phase error

Note for mailing list: this was reported as https://go.dev/issue/63151.

Ian