segmentation violation on net·*TCPListener·Accept

[JPascal]

SIGSEGV: segmentation violation
Faulting address: 0x0
PC=0xb7d6e338

0xb7d6e338 unknown pc

goroutine 664 [4]:
gosched+0x48 /home/jpascal/Go/src/pkg/runtime/proc.c:521
gosched()
chanrecv+0x125 /home/jpascal/Go/src/pkg/runtime/chan.c:345
chanrecv(0xb6d45780, 0xb7df1de8, 0x0, 0x1)
runtime·chanrecv1+0x4e /home/jpascal/Go/src/pkg/runtime/chan.c:415
runtime·chanrecv1(0xb6d45780, 0xb6c4dc80)
net·*pollServer·WaitRead+0x5f /home/jpascal/Go/src/pkg/net/fd.go:276
net·*pollServer·WaitRead(0xb7e05900, 0xb6c4dc80, 0x1)
net·*netFD·Read+0x24e /home/jpascal/Go/src/pkg/net/fd.go:384
net·*netFD·Read(0xb6c4dc80, 0xb6af19e8, 0x1, 0x1, 0x0, ...)
net·*TCPConn·Read+0x7a /home/jpascal/Go/src/pkg/net/tcpsock.go:92
net·*TCPConn·Read(0xb6af19c8, 0xb6af19e8, 0x1, 0x1, 0x0, ...)
gob·decodeUintReader+0x9b /home/jpascal/Go/src/pkg/gob/decode.go:49
gob·decodeUintReader(0xb7e3b000, 0xb6af19c8, 0xb6af19e8, 0x1,
0x1, ...)
gob·*Decoder·Decode+0x1da /home/jpascal/Go/src/pkg/gob/decoder.go:76
gob·*Decoder·Decode(0xb6b98e40, 0x8104bd0, 0xb6d6c3c0, 0xb6d6c3c0,
0xb7dea5a0, ...)
rpc·*serverType·input+0x115 /home/jpascal/Go/src/pkg/rpc/server.go:313
rpc·*serverType·input(0xb7de7980, 0xb7e05a40, 0xb6af19c8)
goexit /home/jpascal/Go/src/pkg/runtime/proc.c:135
goexit()
0xb7de7980 unknown pc

goroutine 2 [3]:
runtime·entersyscall+0x60 /home/jpascal/Go/src/pkg/runtime/proc.c:545
runtime·entersyscall()
syscall·Syscall6+0x5 /home/jpascal/Go/src/pkg/syscall/asm_linux_386.s:
40
syscall·Syscall6()
syscall·EpollWait+0x9d /home/jpascal/Go/src/pkg/syscall/
zsyscall_linux_386.go:132
syscall·EpollWait(0x6, 0xb6c05be0, 0x1, 0x1, 0xffffffff, ...)
net·*pollster·WaitFD+0x17c /home/jpascal/Go/src/pkg/net/fd_linux.go:
116
net·*pollster·WaitFD(0xb7daf7f8, 0x0, 0x0, 0x0, 0x0, ...)
net·*pollServer·Run+0x138 /home/jpascal/Go/src/pkg/net/fd.go:236
net·*pollServer·Run(0xb7e05900, 0x80f5114)
goexit /home/jpascal/Go/src/pkg/runtime/proc.c:135
goexit()
0xb7e05900 unknown pc

goroutine 1 [3]:
runtime·entersyscall+0x60 /home/jpascal/Go/src/pkg/runtime/proc.c:545
runtime·entersyscall()
syscall·socketcall+0x5 /home/jpascal/Go/src/pkg/syscall/
asm_linux_386.s:92
syscall·socketcall()
syscall·accept+0x66 /home/jpascal/Go/src/pkg/syscall/
syscall_linux_386.go:91
syscall·accept(0x3, 0xb7e56150, 0xb6a752d0, 0x0, 0x0, ...)
syscall·Accept+0x88 /home/jpascal/Go/src/pkg/syscall/syscall_linux.go:
301
syscall·Accept(0x3, 0x0, 0x0, 0x0, 0x0, ...)
net·*netFD·accept+0x104 /home/jpascal/Go/src/pkg/net/fd.go:507
net·*netFD·accept(0xb7db3380, 0x805c708, 0x0, 0x0, 0x0, ...)
net·*TCPListener·AcceptTCP+0xa1 /home/jpascal/Go/src/pkg/net/
tcpsock.go:253
net·*TCPListener·AcceptTCP(0xb7daf850, 0x0, 0x0, 0x0)
net·*TCPListener·Accept+0x36 /home/jpascal/Go/src/pkg/net/tcpsock.go:
263
net·*TCPListener·Accept(0xb7daf850, 0x0, 0x0, 0x0, 0x0, ...)
main·Demonize+0x2ba /home/jpascal/RedCase/redcasemgr.go:54
main·Demonize()
main·main+0x237 /home/jpascal/RedCase/redcasemgr.go:79
main·main()
mainstart+0xf /home/jpascal/Go/src/pkg/runtime/386/asm.s:81
mainstart()
goexit /home/jpascal/Go/src/pkg/runtime/proc.c:135
goexit()
eax 0x0
ebx 0x80c1688
ecx 0xb7e1a073
edx 0xb7decb90
edi 0xb6cbcc00
esi 0x2e
ebp 0xb7eaf32c
esp 0xb7d6e340
eip 0xb7d6e338
eflags 0x10286
cs 0x73
fs 0x0
gs 0x33
Trace/breakpoint trap



------------ redcasemgr.go ----------------
...
l, err := net.Listen("tcp", "127.0.0.1:3399");
if err != nil { syslog.Log("Can`t create listner: %v",err); }
else {
for true {
Line:54 ---> rw, err := l.Accept(); <--- Line:54
if err != nil {
syslog.Log("Accepc connection error:", err);
} else {
go rpc.ServeConn(rw);
}
}
l.Close();
}
...
------------ redcasemgr.go ----------------

I can not understand in what a problem.
After several attempts (5-10) of connections (between 1 seconds),
program took error "SIGSEGV: segmentation violation".

[Ian Lance Taylor]

JPascal <eshu...@gmail.com> writes:

> SIGSEGV: segmentation violation
> Faulting address: 0x0
> PC=0xb7d6e338

This is clearly a bug somewhere, but I don't know whether the bug is
in the Go code or in your program.

> main·Demonize+0x2ba /home/jpascal/RedCase/redcasemgr.go:54
> main·Demonize()

What does this function do? In Go you can't call fork and expect the
program to keep running. Yes, the issue of daemonization does need to
be addressed somehow.

Ian