go runtime_error ai_generated true

fatal error: all goroutines are asleep - deadlock! (on channel send)

ID: go/goroutine-leak-on-channel-send

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-03-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.21 active — — —
1.22 active — — —

Root Cause

A goroutine attempts to send to a channel with no receiver and no buffer, and no other goroutine is ready to receive, causing the program to deadlock.

generic

中文

一个 goroutine 尝试向没有接收者且没有缓冲的通道发送数据，且没有其他 goroutine 准备好接收，导致程序死锁。

Workarounds

  1. 90% success 
    Ensure a receiver goroutine is started before sending, or use a buffered channel with capacity ≥1 if async is acceptable.
  2. 85% success 
    Use select with default to make send non-blocking, or use a context with timeout to avoid permanent block.

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Buffering may mask the issue temporarily but doesn't solve the fundamental lack of receiver; may cause memory bloat or hidden blocking.

  2. 80% fail

    Sleeping doesn't guarantee a receiver will appear; it's nondeterministic and may still deadlock or slow the program.