go runtime_error ai_generated true

fatal error: all goroutines are asleep - deadlock! (context canceled)

ID: go/goroutine-context-cancel-not-checked

Also available as: JSON · Markdown · 中文
80%Fix Rate
87%Confidence
0Evidence
2026-02-14First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.7 active — — —
1.21 active — — —

Root Cause

Goroutines block on channel operations after context is canceled, without checking cancellation.

generic

中文

协程在上下文被取消后阻塞在通道操作上，没有检查取消状态。

Workarounds

  1. 95% success Always include ctx.Done() in select 
    select {
case <-ch:
case <-ctx.Done():
    return ctx.Err()
}
  2. 90% success Use context.WithTimeout to automatically cancel 
    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
select {
case <-ch:
case <-ctx.Done():
    // timeout
}

Dead Ends

Common approaches that don't work:

  1. Ignoring context in select 90% fail

    Context cancellation doesn't automatically unblock other channels.

  2. Using time.Sleep to wait for cancellation 80% fail

    Sleep doesn't handle cancellation; goroutine still blocks.