go runtime_error ai_generated true

context canceled

ID: go/context-canceled-in-goroutine

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-10-12First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.7+ active — — —

Root Cause

A context was canceled (either by timeout, deadline, or explicit cancel) while a goroutine was still using it. The goroutine receives context.Canceled error from a function that respects the context.

generic

中文

上下文被取消（由于超时、截止时间或显式取消），而某个 goroutine 仍在使用它。该 goroutine 从遵循上下文的函数中收到 context.Canceled 错误。

Workarounds

  1. 98% success 
    select {
case <-ctx.Done():
    return ctx.Err()
default:
    // continue
}
  2. 95% success 
    ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()

Dead Ends

Common approaches that don't work:

  1. 95% fail

    Ignoring cancellation can lead to resource leaks, wasted work, and violating the contract of context-aware functions.

  2. 90% fail

    This loses the cancellation signal and any deadlines, potentially causing the goroutine to run indefinitely.