runtime: os/exec fatal error: all goroutines are asleep - deadlock! on mips64

[jgbooks]

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

$ go version
>go version go1.15.1 

Does this issue reproduce with the latest release?

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

go env Output

$ go env
running env
Kernel version:4.4.131
Architecture:          mips64
Byte Order:            Little Endian
CPU(s):                4
On-line CPU(s) list:   0-3

What did you do?

package main

import (
	"os/exec"
	"strconv"
	"strings"
	"os"
	"log"
	"time"
)

// Check root rights to use system service
func checkPrivileges() (bool) {
	if output, err := exec.Command("id", "-g").Output(); err == nil {
		if gid, parseErr := strconv.ParseUint(strings.TrimSpace(string(output)), 10, 32); parseErr == nil {
			if gid == 0 {
				return true
			}
			return false
		}
	} else {
		// TODO: This is not true for user services.
		return os.Getppid() != 1
	}
	return false
}

func main(){
	log.SetFlags(log.Lshortfile|log.Ltime)
	checkPrivileges()
	time.Sleep(10*time.Second)
}

CGO_ENABLED=0 GOARCH=mips64le GOMIPS=softfloat GOOS=linux go build command.go

What did you expect to see?

What did you see instead?

fatal error: all goroutines are asleep - deadlock!

goroutine 1 [chan receive]:
os/exec.(*Cmd).Wait(0xc0000c4000, 0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:515 +0x128
os/exec.(*Cmd).Run(0xc0000c4000, 0xc0000c2050, 0x0)
	/usr/local/go/src/os/exec/exec.go:341 +0x74
os/exec.(*Cmd).Output(0xc0000c4000, 0x2, 0xc0000a0f58, 0x1, 0x1, 0xc0000c4000)
	/usr/local/go/src/os/exec/exec.go:546 +0xa4
main.checkPrivileges(0xc0000c2000)
	/root/client/debug/command.go:14 +0x8c
main.main()
	/root/client/debug/command.go:30 +0x54

goroutine 19 [IO wait]:
internal/poll.runtime_pollWait(0xffca558d28, 0x72, 0x118420)
	/usr/local/go/src/runtime/netpoll.go:220 +0x60
internal/poll.(*pollDesc).wait(0xc0000be258, 0x72, 0xc000058001, 0x8000, 0x8000)
	/usr/local/go/src/internal/poll/fd_poll_runtime.go:87 +0x50
internal/poll.(*pollDesc).waitRead(...)
	/usr/local/go/src/internal/poll/fd_poll_runtime.go:92
internal/poll.(*FD).Read(0xc0000be240, 0xc000058000, 0x8000, 0x8000, 0x0, 0x0, 0x0)
	/usr/local/go/src/internal/poll/fd_unix.go:159 +0x1c4
os.(*File).read(...)
	/usr/local/go/src/os/file_posix.go:31
os.(*File).Read(0xc0000bc038, 0xc000058000, 0x8000, 0x8000, 0x0, 0x0, 0x0)
	/usr/local/go/src/os/file.go:116 +0x7c
io.copyBuffer(0x1183a0, 0xc0000c2050, 0x1182e0, 0xc0000bc038, 0xc000058000, 0x8000, 0x8000, 0x0, 0x0, 0x0)
	/usr/local/go/src/io/io.go:409 +0x108
io.Copy(...)
	/usr/local/go/src/io/io.go:368
os/exec.(*Cmd).writerDescriptor.func1(0x0, 0x0)
	/usr/local/go/src/os/exec/exec.go:311 +0x70
os/exec.(*Cmd).Start.func1(0xc0000c4000, 0xc0000ae0c0)
	/usr/local/go/src/os/exec/exec.go:441 +0x3c
created by os/exec.(*Cmd).Start
	/usr/local/go/src/os/exec/exec.go:440 +0x454

[ianlancetaylor]

Does the program fail quickly, or does it wait for 10 seconds?

Is it possible for you to test this with Go tip? Thanks.

Please also include the output of running go env. The output you showed is from some other program. Thanks.

[jgbooks]

it fail quickly.
Before that, I compiled in AMD64, running on MIPS64

I try to build an go1.5.5 environment on MIPS64,The following problems occurred

root@topdesk-os:/home# go env
warning: GOPATH set to GOROOT (/usr/local/go) has no effect
fatal error: all goroutines are asleep - deadlock!

goroutine 1 [chan receive]:
os/exec.(*Cmd).Wait(0xc000140000, 0x0, 0x0)
	/opt/go-linux-mips64le-bootstrap/src/os/exec/exec.go:515 +0x128
os/exec.(*Cmd).Run(0xc000140000, 0xc0001062d0, 0xc000110580)
	/opt/go-linux-mips64le-bootstrap/src/os/exec/exec.go:341 +0x74
os/exec.(*Cmd).CombinedOutput(0xc000140000, 0xc00010e2c0, 0x2c, 0x2c, 0x2d, 0xc000110580)
	/opt/go-linux-mips64le-bootstrap/src/os/exec/exec.go:567 +0xbc
cmd/go/internal/work.(*Builder).gccSupportsFlag(0xc00011e3c0, 0xc00011c060, 0x1, 0x1, 0x6793cb, 0x16, 0x0)
	/opt/go-linux-mips64le-bootstrap/src/cmd/go/internal/work/exec.go:2466 +0x4e8
cmd/go/internal/work.(*Builder).compilerCmd(0xc00011e3c0, 0xc00011c060, 0x1, 0x1, 0x66d59d, 0x1, 0x0, 0x0, 0xc00010aa00, 0xc00010a9a0, ...)
	/opt/go-linux-mips64le-bootstrap/src/cmd/go/internal/work/exec.go:2375 +0x420
cmd/go/internal/work.(*Builder).GccCmd(0xc00011e3c0, 0x66d59d, 0x1, 0x0, 0x0, 0xc00010a9a0, 0x2, 0x2)
	/opt/go-linux-mips64le-bootstrap/src/cmd/go/internal/work/exec.go:2301 +0x6c
cmd/go/internal/envcmd.ExtraEnvVarsCostly(0x603200, 0xc000110360, 0x1)
	/opt/go-linux-mips64le-bootstrap/src/cmd/go/internal/envcmd/env.go:166 +0x1e0
cmd/go/internal/envcmd.runEnv(0x9f5640, 0xc00000a0d0, 0x0, 0x0)
	/opt/go-linux-mips64le-bootstrap/src/cmd/go/internal/envcmd/env.go:222 +0x1258
main.main()
	/opt/go-linux-mips64le-bootstrap/src/cmd/go/main.go:190 +0x858

goroutine 17 [IO wait]:
internal/poll.runtime_pollWait(0xffc1da0e88, 0x72, 0x73cca0)
	/opt/go-linux-mips64le-bootstrap/src/runtime/netpoll.go:222 +0x60
internal/poll.(*pollDesc).wait(0xc00013c0d8, 0x72, 0x73cc01, 0x9b03e0, 0x0)
	/opt/go-linux-mips64le-bootstrap/src/internal/poll/fd_poll_runtime.go:87 +0x50
internal/poll.(*pollDesc).waitRead(...)
	/opt/go-linux-mips64le-bootstrap/src/internal/poll/fd_poll_runtime.go:92
internal/poll.(*FD).Read(0xc00013c0c0, 0xc000022646, 0x5ba, 0x5ba, 0x0, 0x0, 0x0)
	/opt/go-linux-mips64le-bootstrap/src/internal/poll/fd_unix.go:159 +0x1c0
os.(*File).read(...)
	/opt/go-linux-mips64le-bootstrap/src/os/file_posix.go:31
os.(*File).Read(0xc00010c028, 0xc000022646, 0x5ba, 0x5ba, 0x46, 0x0, 0x0)
	/opt/go-linux-mips64le-bootstrap/src/os/file.go:116 +0x7c
bytes.(*Buffer).ReadFrom(0xc0001062d0, 0x73bfc0, 0xc00010c028, 0xffc1dea998, 0xc0001062d0, 0x1)
	/opt/go-linux-mips64le-bootstrap/src/bytes/buffer.go:204 +0xcc
io.copyBuffer(0x73b320, 0xc0001062d0, 0x73bfc0, 0xc00010c028, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
	/opt/go-linux-mips64le-bootstrap/src/io/io.go:395 +0x338
io.Copy(...)
	/opt/go-linux-mips64le-bootstrap/src/io/io.go:368
os/exec.(*Cmd).writerDescriptor.func1(0x0, 0x0)
	/opt/go-linux-mips64le-bootstrap/src/os/exec/exec.go:311 +0x70
os/exec.(*Cmd).Start.func1(0xc000140000, 0xc00010ab60)
	/opt/go-linux-mips64le-bootstrap/src/os/exec/exec.go:441 +0x3c
created by os/exec.(*Cmd).Start
	/opt/go-linux-mips64le-bootstrap/src/os/exec/exec.go:440 +0x454

[jgbooks]

@ianlancetaylor
I found that this version works of "go version go1.13.15 linux/amd64".
When I have time, I'll find out why

[jgbooks]

I tired 1.14.2,and1.15.x, this is not work. only 1.13.15 works

[odeke-em]

Thanks for the report @jgbooks. I shall triage this for Go1.17, and mark it as needing investigation.

[dmitshur]

We may not get to resolve this in Go 1.17, so moving to Backlog for now.