Im carzy agent… bytes.Buffer : truncation out of range

[able]

Download the attachment ， export to you go/src/ .  you need to run  cd  webgame/server/message && go get  

cd  gameai   and go build  in the folder ,.

1. ./gameai & 

2.  go test -v 

after 100000 circulations  :

panic: bytes.Buffer: truncation out of range

goroutine 29 [running]:

bytes.(*Buffer).Truncate(0xc20069aee0, 0x02013/05/2)

/usr/local/go11/src/pkg/bytes/buffer.go:65 +0xc7

bytes.(*Buffer).Read(0xc20069aee0, 0xc2007267a2, 0x2, 0x6, 0x0, ...)

/usr/local/go11/src/pkg/bytes/buffer.go:255 +0x6c

io.ReadAtLeast(0xc2000fb1b0, 0xc20069aee0, 0xc2007267a0, 0x4, 0x8, ...)

/usr/local/go11/src/pkg/io/io.go:284 +0xf7

io.ReadFull(0xc2000fb1b0, 0xc20069aee0, 0xc2007267a0, 0x4, 0x8, ...)

/usr/local/go11/src/pkg/io/io.go:302 +0x6f

encoding/binary.Read(0xc2000fb1b0, 0xc20069aee0, 0xc200151c60, 0x3d, 0x217980, ...)

/usr/local/go11/src/pkg/encoding/binary/binary.go:136 +0xf2

webgame/server/gamelib.func·002(0xc20014ecb0, 0xc20014e955, 0x22, 0x3f)

/Users/gao/code/mygo/src/webgame/server/gamelib/server.go:37 +0x2ab

webgame/server/gamelib.(*ServerMex).connDataSplit(0xc2000bf9b0)

/Users/gao/code/mygo/src/webgame/server/gamelib/server.go:129 +0x40a

created by webgame/server/gamelib.(*ServerMex).RunServer

/Users/gao/code/mygo/src/webgame/server/gamelib/server.go:180 +0xa4

goroutine 1 [IO wait]:

net.runtime_pollWait(0x5fde60, 0x72, 0x0)

/usr/local/go11/src/pkg/runtime/znetpoll_darwin_amd64.c:118 +0x82

net.(*pollDesc).WaitRead(0xc2000d42c0, 0x23, 0xc2000fb690)

/usr/local/go11/src/pkg/net/fd_poll_runtime.go:75 +0x31

net.(*netFD).accept(0xc2000d4240, 0x38bc90, 0x0, 0xc2000fb690, 0x23, ...)

/usr/local/go11/src/pkg/net/fd_unix.go:385 +0x2c1

net.(*TCPListener).AcceptTCP(0xc200159068, 0x3032d, 0x750ec8, 0x3032d)

/usr/local/go11/src/pkg/net/tcpsock_posix.go:229 +0x45

net.(*TCPListener).Accept(0xc200159068, 0xc20014ecb0, 0xc20014ecb0, 0xc20014ecb0, 0x0, ...)

/usr/local/go11/src/pkg/net/tcpsock_posix.go:239 +0x25

webgame/server/gamelib.(*ServerMex).RunServer(0xc2000bf9b0, 0xc2000fb2a0, 0x2, 0x5, 0xc2000fb2a0, ...)

/Users/gao/code/mygo/src/webgame/server/gamelib/server.go:185 +0x113

main.main()

/Users/gao/code/mygo/src/webgame1111/server/gameai/server.go:36 +0x90

goroutine 2 [syscall]:

but but but  but but but but !!!! well I can assure you there is always a method to my madness. 

gamelib/server.go  in line 33 ,

},

HEAD_14B: func(r *Request, b []byte) {

if len(b) < 14 {

return

}

Log.Println(b) // Now … the pain not exists! 

buf := bytes.NewBuffer(b)

tbuf = bytes.NewBuffer(buf.Next(2))

binary.Read(tbuf, binary.BigEndian, &r.Cid)

tbuf = bytes.NewBuffer(buf.Next(4))

binary.Read(tbuf, binary.BigEndian, &r.Rid)

tbuf = bytes.NewBuffer(buf.Next(4))

binary.Read(tbuf, binary.BigEndian, &r.Uid)

tbuf = bytes.NewBuffer(buf.Next(2))

binary.Read(tbuf, binary.BigEndian, &r.Typ)

tbuf = bytes.NewBuffer(buf.Next(2))

binary.Read(tbuf, binary.BigEndian, &r.Mlen)

r.Msg = buf.Next(int(r.Mlen))

},

My system ……

Darwin gaomatoMacBook-Air.local 12.3.0 Darwin Kernel Version 12.3.0: Sun Jan  6 22:37:10 PST 2013; root:xnu-2050.22.13~1/RELEASE_X86_64 x86_64

[Dave Cheney]

I am almost certain your program contains a data race. Please compile it using go install -race and see if that shows up anything.

server.go: line 15 is my first suspicion.

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