golang/go

x/sys/plan9: function Exit causes build failure

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#78506 opened on Apr 2, 2026

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BugReportNeedsInvestigationOS-Plan9help wanted

Description

package main

import "golang.org/x/sys/plan9"

func main() { plan9.Exit(0) }

This doesn't build

$ GOARCH=amd64 GOOS=plan9 go build
# test
golang.org/x/sys/plan9.exit: relocation target syscall.exit not defined

plan9.Exit calls plan9.exit, which is an assembly stub that jumps to syscall.exit. But there is no syscall.exit in the syscall package on Plan 9.

If the function is not needed (as it clearly doesn't work so nobody is using it), we probably can delete it. If it is needed for some reason, it could just call syscall.Exit, in Go code, not assembly.

cc @golang/plan9

Contributor guide

Tech stack
go
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Go programming knowledgebasic understanding of syscalls
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75
Research direction
The issue is a build failure in the plan9.Exit function. The function currently calls an assembly stub that jumps to syscall.exit, which doesn't exist on Plan 9. Two solutions are proposed: delete the function entirely or rewrite it to call syscall.Exit directly in Go code. To implement, locate the file containing the plan9.Exit function in the golang.org/x/sys/plan9 package. The assembly stub for exit may be in a .s file. The fix is straightforward: either remove the exit function and its assembly stub, or replace the assembly implementation with a Go function that calls syscall.Exit. No linked PRs or maintainer questions in the comments.