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bufio: 1.5.1 panic slice bounds out of range #12925

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semihalev opened this issue Oct 14, 2015 · 6 comments
Closed

bufio: 1.5.1 panic slice bounds out of range #12925

semihalev opened this issue Oct 14, 2015 · 6 comments
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Go1.6

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@semihalev
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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 ianlancetaylor changed the title 1.5.1 panic slice bounds out of range for bufio package bufio: 1.5.1 panic slice bounds out of range Oct 14, 2015
@ianlancetaylor ianlancetaylor added this to the Go1.6 milestone Oct 14, 2015
@ianlancetaylor
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Have you run your program under the race detector?

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

@adg
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adg commented Oct 14, 2015

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

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

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

@adg
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adg commented Oct 14, 2015

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

@adg adg closed this as completed Oct 14, 2015
@golang golang locked and limited conversation to collaborators Oct 17, 2016
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@semihalev @ianlancetaylor @adg @gopherbot