math/rand: Intn: panic index out of range

[WanliTian]

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.6.2 linux/amd64

What operating system and processor architecture are you using (go env)?

ubuntu 16.04 ts
Intel® Core™ i5-6200U CPU @ 2.30GHz × 4

panic: runtime error: index out of range

goroutine 550875 [running]:
panic(0xb494e0, 0xc82000a130)
        /home/eric/Code/Go/go/src/runtime/panic.go:481 +0x3e6
math/rand.(*rngSource).Int63(0xc820199500, 0x0)
        /home/eric/Code/Go/go/src/math/rand/rng.go:244 +0xc1
math/rand.(*Rand).Int63(0xc820231350, 0x98)
        /home/eric/Code/Go/go/src/math/rand/rand.go:46 +0x39
math/rand.(*Rand).Int31(0xc820231350, 0xc820d291e0)
        /home/eric/Code/Go/go/src/math/rand/rand.go:52 +0x21
math/rand.(*Rand).Int31n(0xc820231350, 0x1, 0x0)
        /home/eric/Code/Go/go/src/math/rand/rand.go:84 +0x8d
math/rand.(*Rand).Intn(0xc820231350, 0x1, 0xc8201daa24)
        /home/eric/Code/Go/go/src/math/rand/rand.go:101 +0x92

[odeke-em]

@WanliTian would you mind providing a minimal reproduction for this bug?
Otherwise trying to diagnose or debug this issue is very hard.

[dsnet]

Can you also build and test your program with the -race flag? This type of error is highly indicative of a race condition.

[WanliTian]

i find this #3611, and math.Rand is not safe for concurrent use

[davecheney]

This is most likely a data race in your application. Please check for data
races with go build -race.

If that does not help, please upgrade to the supported version of Go,
1.7.3, and if that does not help, please post a runnable code sample that
demonstrates the issue.

Thank you.

On Thu, Oct 27, 2016 at 5:02 PM, WanliTian notifications@github.com wrote:

Please answer these questions before submitting your issue. Thanks!
What version of Go are you using (go version)?

go version go1.6.2 linux/amd64
What operating system and processor architecture are you using (go env)?

ubuntu 16.04 ts
Intel® Core™ i5-6200U CPU @ 2.30GHz × 4

panic: runtime error: index out of range

goroutine 550875 [running]:
panic(0xb494e0, 0xc82000a130)
/home/eric/Code/Go/go/src/runtime/panic.go:481 +0x3e6
math/rand.(_rngSource).Int63(0xc820199500, 0x0)
/home/eric/Code/Go/go/src/math/rand/rng.go:244 +0xc1
math/rand.(_Rand).Int63(0xc820231350, 0x98)
/home/eric/Code/Go/go/src/math/rand/rand.go:46 +0x39
math/rand.(_Rand).Int31(0xc820231350, 0xc820d291e0)
/home/eric/Code/Go/go/src/math/rand/rand.go:52 +0x21
math/rand.(_Rand).Int31n(0xc820231350, 0x1, 0x0)
/home/eric/Code/Go/go/src/math/rand/rand.go:84 +0x8d
math/rand.(*Rand).Intn(0xc820231350, 0x1, 0xc8201daa24)
/home/eric/Code/Go/go/src/math/rand/rand.go:101 +0x92

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