Closed
Description
by myspot40:
I somehow managed to trigger a segfault with Go code. From what I
understand, this should not happen at all. A friend and I are trying to
make a rudimentary IRC server in Go, and I was testing NICK and PRIVMSG
when this occured. I telneted to localhost at port 6667 in two terminals
while running this server. First I entered PASS into both terminals, it is
ignored by the server correctly. Then I entered 'NICK foo' in one terminal
and 'NICK bar' in another. After getting sidetracked, I forgot I nicked
the connections, and ran both commands again, except this time 'NICK foo'
was in the second terminal while 'NICK bar' was in the first. I then tried
to send a PRIVMSG from foo to bar, and generated the segfault.
Here is the full output while I ran the server:
$ ./GoGet
2009/11/19 20:48:25 STARTING SERVER...
2009/11/19 20:48:29 Connection accepted:127.0.0.1:53787
2009/11/19 20:48:36 foo HAS REGISTERED A NICK
&{foo ����� []}
&{foo NICK [bar]}
2009/11/19 20:48:47 bar HAS REGISTERED A NICK
&{bar PRIVMSG [foo :hi]}
SIGSEGV: segmentation violation
Faulting address: 0x28
PC=0x400b1c
main·sendMessage+0xa4 /home/me/Code/Go/GoGet/src/main.go:44
main·sendMessage(0x0, 0x0, 0x0, 0x0, 0x0, ...)
main·parseLine+0x1d1 /home/me/Code/Go/GoGet/src/main.go:55
main·parseLine(0x413b50c0, 0x7fb6, 0x13, 0x7fb6, 0x4131f420, ...)
main·handleConnection+0x22a /home/me/Code/Go/GoGet/src/main.go:73
main·handleConnection(0x4131f420, 0x7fb6)
goexit /home/me/go/src/pkg/runtime/proc.c:135
goexit()
0x7fb64131f420 unknown pc
goroutine 3:
gosched+0x34 /home/me/go/src/pkg/runtime/proc.c:516
gosched()
chanrecv+0x130 /home/me/go/src/pkg/runtime/chan.c:345
chanrecv(0x4131d4b0, 0x7fb6, 0x41356088, 0x7fb6, 0x0, ...)
runtime·chanrecv1+0x50 /home/me/go/src/pkg/runtime/chan.c:415
runtime·chanrecv1(0x4131d4b0, 0x7fb6)
net·*pollServer·WaitRead+0x49 /home/me/go/src/pkg/net/fd.go:278
net·*pollServer·WaitRead(0x4131c340, 0x7fb6, 0x413523f0, 0x7fb6)
net·*netFD·accept+0x2af /home/me/go/src/pkg/net/fd.go:424
net·*netFD·accept(0x413523f0, 0x7fb6, 0x40bd8d, 0x0, 0x413525a0, ...)
net·*TCPListener·AcceptTCP+0x5a /home/me/go/src/pkg/net/tcpsock.go:253
net·*TCPListener·AcceptTCP(0x41316a10, 0x7fb6, 0x0, 0x0, 0x0, ...)
net·*TCPListener·Accept+0x34 /home/me/go/src/pkg/net/tcpsock.go:263
net·*TCPListener·Accept(0x41316a10, 0x7fb6, 0x0, 0x0, 0x0, ...)
main·getConnections+0x1c /home/me/Code/Go/GoGet/src/main.go:20
main·getConnections(0x41316a10, 0x7fb6, 0x4131d550, 0x7fb6)
goexit /home/me/go/src/pkg/runtime/proc.c:135
goexit()
0x7fb641316a10 unknown pc
goroutine 2:
runtime·entersyscall+0x50 /home/me/go/src/pkg/runtime/proc.c:540
runtime·entersyscall()
syscall·Syscall6+0x5 /home/me/go/src/pkg/syscall/asm_linux_amd64.s:41
syscall·Syscall6()
syscall·EpollWait+0x84 /home/me/go/src/pkg/syscall/zsyscall_linux_amd64.go:132
syscall·EpollWait(0x6, 0x7fb6, 0x4138a580, 0x7fb6, 0x1, ...)
net·*pollster·WaitFD+0xb5 /home/me/go/src/pkg/net/fd_linux.go:116
net·*pollster·WaitFD(0x4134ea80, 0x7fb6, 0x0, 0x0, 0x72, ...)
net·*pollServer·Run+0x9e /home/me/go/src/pkg/net/fd.go:237
net·*pollServer·Run(0x4131c340, 0x7fb6)
goexit /home/me/go/src/pkg/runtime/proc.c:135
goexit()
0x7fb64131c340 unknown pc
goroutine 1:
gosched+0x34 /home/me/go/src/pkg/runtime/proc.c:516
gosched()
chanrecv+0x318 /home/me/go/src/pkg/runtime/chan.c:319
chanrecv(0x4131d550, 0x7fb6, 0x41353f38, 0x7fb6, 0x0, ...)
runtime·chanrecv1+0x50 /home/me/go/src/pkg/runtime/chan.c:415
runtime·chanrecv1(0x4131d550, 0x7fb6)
main·main+0xe6 /home/me/Code/Go/GoGet/src/main.go:88
main·main()
mainstart+0xf /home/me/go/src/pkg/runtime/amd64/asm.s:55
mainstart()
goexit /home/me/go/src/pkg/runtime/proc.c:135
goexit()
rax 0xe
rbx 0x0
rcx 0xd
rdx 0x7fb64138a780
rdi 0x7fb6413a2e78
rsi 0x7fb6413a2e80
rbp 0x0
rsp 0x7fb6413a2e60
r8 0x7fb64138a790
r9 0x7fb6413a2d40
r10 0x79
r11 0x246
r12 0x2
r13 0x7fff35e60c10
r14 0x486980
r15 0x7fb641397090
rip 0x400b1c
rflags 0x10202
cs 0x33
fs 0x0
gs 0x0
zsh: trace trap ./GoGet
Attached are the two source files I have.
Attachments: