go runtime_error ai_generated true

panic: time: Reset called on timer with negative duration

ID: go/panic-timer-reset-negative-duration

Also available as: JSON · Markdown · 中文
85%Fix Rate
85%Confidence
1Evidence
2023-06-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Go 1.15 active — — —
Go 1.16 active — — —
Go 1.17 active — — —
Go 1.18 active — — —
Go 1.19 active — — —
Go 1.20 active — — —
Go 1.21 active — — —
Go 1.22 active — — —
Go 1.23 active — — —

Root Cause

Calling Timer.Reset() with a negative duration value causes a runtime panic in Go's time package.

generic

中文

使用负持续时间值调用 Timer.Reset() 会导致 Go 的 time 包中的运行时恐慌。

Official Documentation

https://pkg.go.dev/time#Timer.Reset

Workarounds

  1. 95% success Use time.Duration(math.Abs(float64(d))) to ensure non-negative duration before calling Reset() 
    Use time.Duration(math.Abs(float64(d))) to ensure non-negative duration before calling Reset()
  2. 90% success Check duration with if d < 0 { d = 0 } before timer.Reset(d) 
    Check duration with if d < 0 { d = 0 } before timer.Reset(d)
  3. 85% success Use time.NewTimer() with a positive duration and stop it explicitly instead of resetting 
    Use time.NewTimer() with a positive duration and stop it explicitly instead of resetting

中文步骤

  1. Use time.Duration(math.Abs(float64(d))) to ensure non-negative duration before calling Reset()
  2. Check duration with if d < 0 { d = 0 } before timer.Reset(d)
  3. Use time.NewTimer() with a positive duration and stop it explicitly instead of resetting

Dead Ends

Common approaches that don't work:

  1. 80% fail

    time.Duration() does not validate sign; negative values remain negative.

  2. 90% fail

    time.AfterFunc() also panics on negative duration; same underlying issue.

  3. 75% fail

    Panic recovery masks the bug but timer state is corrupted; leads to unpredictable behavior.