go runtime_error ai_generated true

fatal error: concurrent map read and map write

ID: go/data-race-on-map

Also available as: JSON · Markdown · 中文
80%Fix Rate
90%Confidence
0Evidence
2024-01-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.6 active — — —
1.21 active — — —

Root Cause

Multiple goroutines access a map concurrently without synchronization, causing a runtime fatal error.

generic

中文

多个goroutine在没有同步的情况下并发访问map，导致运行时致命错误。

Workarounds

  1. 95% success 
    Use sync.RWMutex to protect reads and writes to the map.
  2. 90% success 
    Use sync.Map which is safe for concurrent use.

Dead Ends

Common approaches that don't work:

  1. 90% fail

    It can cause crashes or data corruption; ignoring is not safe.

  2. 40% fail

    If not all accesses are protected, the race can still occur.

  3. 70% fail

    Copying is expensive and does not solve the root race condition.