"os/exec": problem building with -race in MacOS Monterey 12.1 when using package "os/exec"

[jeberly]

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

go version go1.17.5 darwin/amd64

Does this issue reproduce with the latest release?

I am using latest

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

go env Output

$ go env
GOARCH="amd64"
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOVERSION="go1.17.5"
Important, I hit this issue on upgrading to MacOS Monterey, specifically 12.1 (21C52)

MacOS Monterey, specifically 12.1 (21C52)

What did you do?

After building with -race, it fails to run. Here is a small sample go program that reproduces the issue.

package main

import (
	"bytes"
	"fmt"
	"os/exec"
)

func main() {
	path, err := exec.LookPath("uname")
	if err != nil {
		panic(err)
	}

	cmd := exec.Command(path, "-a")
	var out bytes.Buffer
	cmd.Stderr = nil // goes to os.DevNull
	cmd.Stdout = &out
	err = cmd.Run()
	if err != nil {
		panic(err)
	}

	fmt.Println(out.String())
}

What did you expect to see?

The binary would run without errors.

What did you see instead?

➜  hello ./hello         
hello(8085,0x79c0600) malloc: *** error for object 0x600001700080: pointer being freed was not allocated
hello(8085,0x79c0600) malloc: *** set a breakpoint in malloc_error_break to debug
SIGABRT: abort
PC=0x7ff81d7f7112 m=0 sigcode=0

goroutine 0 [idle]:
syscall.rawSyscall(0x10d11a0, 0x0, 0x0, 0x0)
	/usr/local/go/src/runtime/sys_darwin.go:77 +0x47 fp=0xc000121888 sp=0xc000121868 pc=0x109db67
syscall.rawSyscall(0x10a37e5, 0x0, 0x0, 0x1)
	<autogenerated>:1 +0x26 fp=0xc0001218d0 sp=0xc000121888 pc=0x10a3e46
syscall.forkAndExecInChild(0xc00013c098, {0xc000130030, 0x3, 0x1}, {0xc0001402c0, 0x2c, 0x0}, 0x0, 0x0, 0xc000121bd8, ...)
	/usr/local/go/src/syscall/exec_libc2.go:80 +0xed fp=0xc000121960 sp=0xc0001218d0 pc=0x10cd3ad
syscall.forkExec({0xc00013c059, 0x7}, {0xc000148000, 0x2, 0x2}, 0xc000121bd8)
	/usr/local/go/src/syscall/exec_unix.go:210 +0x58f fp=0xc000121af8 sp=0xc000121960 pc=0x10ce42f
syscall.StartProcess(...)
	/usr/local/go/src/syscall/exec_unix.go:256
os.startProcess({0xc00013c059, 0x7}, {0xc000148000, 0x2, 0x2}, 0xc000121e68)
	/usr/local/go/src/os/exec_posix.go:55 +0x526 fp=0xc000121c30 sp=0xc000121af8 pc=0x10e3e06
os.StartProcess({0xc00013c059, 0x7}, {0xc000148000, 0x2, 0x2}, 0x55555555555555)
	/usr/local/go/src/os/exec.go:109 +0x7a fp=0xc000121c90 sp=0xc000121c30 pc=0x10e37da
os/exec.(*Cmd).Start(0xc000140160)
	/usr/local/go/src/os/exec/exec.go:422 +0x9d4 fp=0xc000121ec0 sp=0xc000121c90 pc=0x10fb614
os/exec.(*Cmd).Run(0xc00013c059)
	/usr/local/go/src/os/exec/exec.go:338 +0x31 fp=0xc000121f00 sp=0xc000121ec0 pc=0x10fabd1
main.main()
	/Users/john/go/src/github.com/john/hello/main.go:19 +0x150 fp=0xc000121f80 sp=0xc000121f00 pc=0x10fd530
runtime.main()
	/usr/local/go/src/runtime/proc.go:255 +0x227 fp=0xc000121fe0 sp=0xc000121f80 pc=0x1073c87
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:1581 +0x1 fp=0xc000121fe8 sp=0xc000121fe0 pc=0x10a0d41

[cherrymui]

Looks like a dup of #50073 . It should be fixed at Go tip or Go 1.18beta1, and will be included in the next 1.17 minor release. Thanks.