golang/go

cmd/go: OOB panic in cmd/go/internal/list.runList

Open

#79,749 opened on May 29, 2026

View on GitHub
 (6 comments) (0 reactions) (0 assignees)Go (19,008 forks)batch import
GoCommandToolsgoplshelp wanted

Repository metrics

Stars
 (133,883 stars)
PR merge metrics
 (No merged PRs in 30d)

Description

#!watchflakes
default <- pkg == "golang.org/x/tools/gopls/internal/cache" && test == "TestMatchingPortsStdlib"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestMatchingPortsStdlib
    port_test.go:43: err: exit status 2: stderr: panic: runtime error: index out of range [0] with length 0
        
        goroutine 1 [running]:
        cmd/go/internal/list.runList({0x7ff704ffbd80, 0x7ff7050c0600}, 0xb93ce242990?, {0xb93ce13c1c0, 0x2, 0x4})
        	cmd/go/internal/list/list.go:887 +0x30cd
        main.invoke(0x7ff7050698c8, {0xb93ce13c110, 0xd, 0xf})
        	cmd/go/main.go:340 +0x8bf
        main.main()
        	cmd/go/main.go:219 +0xee5
        
--- FAIL: TestMatchingPortsStdlib (44.89s)

— watchflakes

Contributor guide

Research direction
Investigate the panic at cmd/go/internal/list/list.go:887: index out of range. Check the logic in runList to understand why an empty list is being accessed.
Tech stack
go
Domain
cli
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.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Go
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65