bufio: 1.5.1 panic slice bounds out of range

[semihalev]

Hi,

Today, i received panic from bufio reader. I used bufio for tcp connections. The function running for 30 days without problem.

Here is the sample code:

func TCPReader(connection *net.TCPConn) {
    reader := bufio.NewReaderSize(connection, 8192)

    header := make([]byte, 9)
    for {
        len, err := reader.Read(header[:])
    }
}

Panic Log:
panic: runtime error: slice bounds out of range

goroutine 490939 [running]:
bufio.(*Reader).Read(0xc828791f80, 0xc82858b670, 0x9, 0x9, 0x0, 0x0, 0x0)
/usr/local/go/src/bufio/bufio.go:214 +0x3c8

[ianlancetaylor]

Have you run your program under the race detector?

[semihalev]

Yes, I did'nt see any problem for read.

[adg]

We're going to need a short program that reproduces this. Can you isolate the issue?

[semihalev]

Ok, i will create a small project, and inform you again.

[semihalev]

I found data race in tcp reconnect function. I try to change first this. I will inform you.

[adg]

In that case, I'm going to close this issue until you report back.