Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

go version go1.7.6 linux/386

Does this issue reproduce with the latest release?

I'm not exactly

What operating system and processor architecture are you using (go env)?

GOARCH="386"
GOBIN=""
GOEXE=""
GOHOSTARCH="386"
GOHOSTOS="linux"
GOOS="linux"
GOPATH=""
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/linux_386"
CC="gcc"
GOGCCFLAGS="-fPIC -m32 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build948719345=/tmp/go-build"
CXX="g++"
CGO_ENABLED="1"

What did you do?

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.
fatal error: unexpected signal during runtime execution
[signal SIGSEGV: segmentation violation code=0x1 addr=0x4 pc=0x389b90]

runtime stack:
runtime.throw(0x42ad93, 0x2a)
/usr/local/go/src/runtime/panic.go:566 +0x78
runtime.sigpanic()
/usr/local/go/src/runtime/sigpanic_unix.go:12 +0x44

goroutine 9 [syscall, locked to thread]:
runtime.cgocall(0x389604, 0x1083fe7c, 0x0)
/usr/local/go/src/runtime/cgocall.go:131 +0x130 fp=0x1083fe5c sp=0x1083fe40
main._Cfunc_snmpget(0x416057a8, 0x0)
??:0 +0x3c fp=0x1083fe78 sp=0x1083fe5c
main.snmpDevGetTimer(0x3ac478, 0x109b1f80)
/home/source/source/switch/apps/snmp_passthrough/src/snmp_passthrough/polling.go:244 +0xe4 fp=0x1083febc sp=0x1083fe78
timer.runCallback(0x45c91c, 0x3ac478, 0x109b1f80)
/home/source/source/switch/apps/snmp_passthrough/src/timer/timer.go:193 +0x5c fp=0x1083fecc sp=0x1083febc
timer.Tick()
/home/source/source/switch/apps/snmp_passthrough/src/timer/timer.go:156 +0x1fc fp=0x1083ffb8 sp=0x1083fecc
timer.selfTickRoutine(0x3b9aca00, 0x0)
/home/source/source/switch/apps/snmp_passthrough/src/timer/timer.go:181 +0x28 fp=0x1083ffc4 sp=0x1083ffb8
runtime.goexit()
/usr/local/go/src/runtime/asm_arm.s:998 +0x4 fp=0x1083ffc4 sp=0x1083ffc4
created by timer.StartTicks
/home/source/source/switch/apps/snmp_passthrough/src/timer/timer.go:175 +0x34

goroutine 1 [select, 2116 minutes]:
sundray.com/mqttappGw.(*mqttClient).mqttClientLoop(0x5aacc8)
/home/source/source/switch/commonsrc/src/sundray.com/mqttappGw/mqttclient.go:479 +0x3c0
sundray.com/mqttappGw.Loop()
/home/source/source/switch/commonsrc/src/sundray.com/mqttappGw/mqttapp.go:90 +0x20
main.main()
/home/source/source/switch/apps/snmp_passthrough/src/snmp_passthrough/main.go:227 +0x26c

goroutine 17 [syscall, 2116 minutes, locked to thread]:
runtime.goexit()
/usr/local/go/src/runtime/asm_arm.s:998 +0x4

goroutine 5 [chan receive]:
github.com/surge/glog.(*loggingT).flushDaemon(0x5aaf38)
/home/source/source/3party/golang/src/github.com/surge/glog/glog.go:896 +0x60
created by github.com/surge/glog.init.1
/home/source/source/3party/golang/src/github.com/surge/glog/glog.go:410 +0x1ec

goroutine 6 [syscall, 2116 minutes]:
os/signal.signal_recv(0x0)
/usr/local/go/src/runtime/sigqueue.go:116 +0x190
os/signal.loop()
/usr/local/go/src/os/signal/signal_unix.go:22 +0x14
created by os/signal.init.1
/usr/local/go/src/os/signal/signal_unix.go:28 +0x30

goroutine 10 [IO wait, 2116 minutes]:
net.runtime_pollWait(0x41518e58, 0x72, 0x0)
/usr/local/go/src/runtime/netpoll.go:160 +0x60
net.(*pollDesc).wait(0x10812b78, 0x72, 0x0, 0x0)
/usr/local/go/src/net/fd_poll_runtime.go:73 +0x34
net.(*pollDesc).waitRead(0x10812b78, 0x0, 0x0)
/usr/local/go/src/net/fd_poll_runtime.go:78 +0x30
net.(*netFD).accept(0x10812b40, 0x0, 0x594088, 0x1088be50)
/usr/local/go/src/net/fd_unix.go:419 +0x21c
net.(*TCPListener).accept(0x1080c780, 0x0, 0x0, 0x0)
/usr/local/go/src/net/tcpsock_posix.go:132 +0x30
net.(*TCPListener).AcceptTCP(0x1080c780, 0x58d700, 0x0, 0x0)
/usr/local/go/src/net/tcpsock.go:209 +0x9c
net/http.tcpKeepAliveListener.Accept(0x1080c780, 0x0, 0x0, 0x0, 0x0)
/usr/local/go/src/net/http/server.go:2608 +0x3c
net/http.(*Server).Serve(0x108105a0, 0x595f10, 0x1080c780, 0x0, 0x0)
/usr/local/go/src/net/http/server.go:2273 +0x200
net/http.(*Server).ListenAndServe(0x108105a0, 0x0, 0x0)
/usr/local/go/src/net/http/server.go:2219 +0xf4
net/http.ListenAndServe(0x41762b, 0x6, 0x0, 0x0, 0x0, 0x0)
/usr/local/go/src/net/http/server.go:2351 +0x90
main.main.func1()
/home/source/source/switch/apps/snmp_passthrough/src/snmp_passthrough/main.go:201 +0x48
created by main.main
/home/source/source/switch/apps/snmp_passthrough/src/snmp_passthrough/main.go:202 +0x24

goroutine 11 [IO wait, 2116 minutes]:
net.runtime_pollWait(0x41518f48, 0x72, 0x0)
/usr/local/go/src/runtime/netpoll.go:160 +0x60
net.(*pollDesc).wait(0x10812378, 0x72, 0x0, 0x0)
/usr/local/go/src/net/fd_poll_runtime.go:73 +0x34
net.(*pollDesc).waitRead(0x10812378, 0x0, 0x0)
/usr/local/go/src/net/fd_poll_runtime.go:78 +0x30
net.(*netFD).readFrom(0x10812340, 0x1088bd10, 0x8, 0x8, 0x0, 0x0, 0x0, 0x5948f8, 0x1080e090)
/usr/local/go/src/net/fd_unix.go:270 +0x20c
net.(*UDPConn).readFrom(0x1080c578, 0x1088bd10, 0x8, 0x8, 0x0, 0x0, 0x0, 0x0)
/usr/local/go/src/net/udpsock_posix.go:43 +0x54
net.(*UDPConn).ReadFromUDP(0x1080c578, 0x1088bd10, 0x8, 0x8, 0x0, 0x0, 0x0, 0x0)
/usr/local/go/src/net/udpsock.go:85 +0xc8
sundray.com/mqttlogGw.listenMultiCastPacket.func1(0x1088bd10, 0x8, 0x8, 0x0, 0x0)
/home/source/source/switch/commonsrc/src/sundray.com/mqttlogGw/mqttlog.go:280 +0xbc
created by sundray.com/mqttlogGw.listenMultiCastPacket
/home/source/source/switch/commonsrc/src/sundray.com/mqttlogGw/mqttlog.go:306 +0xf0

goroutine 30 [chan receive]:
sundray.com/mqttappGw.(*mqttClient).subHandler(0x5aacc8, 0x109b1c00, 0x45c908)
/home/source/source/switch/commonsrc/src/sundray.com/mqttappGw/mqttclient.go:169 +0xf4
created by sundray.com/mqttappGw.(*mqttClient).mqttClientSub
/home/source/source/switch/commonsrc/src/sundray.com/mqttappGw/mqttclient.go:252 +0x1c0

goroutine 13 [select]:
sundray.com/timerGw.timeTicker()
/home/source/source/switch/commonsrc/src/sundray.com/timerGw/ticker.go:51 +0x334
created by sundray.com/timerGw.startTicker.func1
/home/source/source/switch/commonsrc/src/sundray.com/timerGw/ticker.go:25 +0x8c

goroutine 14 [semacquire]:
sync.runtime_notifyListWait(0x108154c8, 0x2bde)
/usr/local/go/src/runtime/sema.go:267 +0x1d8
sync.(*Cond).Wait(0x108154c0)
/usr/local/go/src/sync/cond.go:57 +0xc4
github.com/surgemq/surgemq/service.(*buffer).ReadWait(0x108645a0, 0x2, 0x0, 0x0, 0x0, 0x0, 0x0)
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/buffer.go:408 +0x210
github.com/surgemq/surgemq/service.(*service).peekMessageSize(0x1086c120, 0x597300, 0x10810460, 0x0, 0x0)
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/sendrecv.go:168 +0x138
github.com/surgemq/surgemq/service.(*service).processor(0x1086c120)
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/process.go:65 +0x1f8
created by github.com/surgemq/surgemq/service.(*service).start
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/service.go:181 +0x444

goroutine 15 [runnable]:
net.runtime_pollWait(0x41518ed0, 0x72, 0x10946f42)
/usr/local/go/src/runtime/netpoll.go:160 +0x60
net.(*pollDesc).wait(0x10812af8, 0x72, 0x0, 0x0)
/usr/local/go/src/net/fd_poll_runtime.go:73 +0x34
net.(*pollDesc).waitRead(0x10812af8, 0x0, 0x0)
/usr/local/go/src/net/fd_poll_runtime.go:78 +0x30
net.(*netFD).Read(0x10812ac0, 0x10946f42, 0x10be, 0x10be, 0x0, 0x5948f8, 0x1080e090)
/usr/local/go/src/net/fd_unix.go:243 +0x1f0
net.(*conn).Read(0x1080c798, 0x10946f42, 0x10be, 0x10be, 0x0, 0x0, 0x0)
/usr/local/go/src/net/net.go:173 +0xb8
github.com/surgemq/surgemq/service.timeoutReader.Read(0xf46b0400, 0x14, 0x4151f228, 0x1080c798, 0x10946f42, 0x10be, 0x10be, 0x0, 0x0, 0x0)
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/sendrecv.go:42 +0x1ec
github.com/surgemq/surgemq/service.(*timeoutReader).Read(0x1088bf40, 0x10946f42, 0x10be, 0x10be, 0x2000, 0x0, 0x0)
:3 +0xbc
github.com/surgemq/surgemq/service.(*buffer).ReadFrom(0x108645a0, 0x594460, 0x1088bf40, 0x0, 0x0, 0x0, 0x0)
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/buffer.go:158 +0x1f8
github.com/surgemq/surgemq/service.(*service).receiver(0x1086c120)
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/sendrecv.go:79 +0x404
created by github.com/surgemq/surgemq/service.(*service).start
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/service.go:187 +0x4c0

goroutine 16 [semacquire]:
sync.runtime_notifyListWait(0x10815508, 0x2bfe)
/usr/local/go/src/runtime/sema.go:267 +0x1d8
sync.(*Cond).Wait(0x10815500)
/usr/local/go/src/sync/cond.go:57 +0xc4
github.com/surgemq/surgemq/service.(*buffer).ReadPeek(0x10864660, 0x2000, 0x0, 0x0, 0x0, 0x0, 0x0)
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/buffer.go:337 +0x204
github.com/surgemq/surgemq/service.(*buffer).WriteTo(0x10864660, 0x593d28, 0x1080c798, 0x0, 0x0, 0x0, 0x0)
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/buffer.go:184 +0xcc
github.com/surgemq/surgemq/service.(*service).sender(0x1086c120)
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/sendrecv.go:125 +0x2e4
created by github.com/surgemq/surgemq/service.(*service).start
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/service.go:192 +0x53c

goroutine 18 [select]:
github.com/surgemq/surgemq/service.(*service).ackProcessor(0x1086c120, 0x10812d00)
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/process.go:225 +0x15c
created by github.com/surgemq/surgemq/service.(*service).processor
/home/source/source/switch/commonsrc/src/github.com/surgemq/surgemq/service/process.go:57 +0x18c

goroutine 19 [select]:
sundray.com/netmqGw.(*Netmq).pingServer(0x1088c400)
/home/source/source/switch/commonsrc/src/sundray.com/netmqGw/netmq.go:459 +0x36c
created by sundray.com/netmqGw.(*Netmq).Init
/home/source/source/switch/commonsrc/src/sundray.com/netmqGw/netmq.go:241 +0x268

goroutine 20 [chan receive, 2116 minutes]:
sundray.com/netmqGw.(*Netmq).connServer(0x1088c400)
/home/source/source/switch/commonsrc/src/sundray.com/netmqGw/netmq.go:325 +0xf0
created by sundray.com/netmqGw.(*Netmq).Init
/home/source/source/switch/commonsrc/src/sundray.com/netmqGw/netmq.go:242 +0x284

goroutine 21 [chan receive, 616 minutes]:
sundray.com/netmqGw.(*Netmq).subServer(0x1088c400)
/home/source/source/switch/commonsrc/src/sundray.com/netmqGw/netmq.go:527 +0x90
created by sundray.com/netmqGw.(*Netmq).Init
/home/source/source/switch/commonsrc/src/sundray.com/netmqGw/netmq.go:243 +0x2a0

goroutine 22 [select, 2116 minutes]:
sundray.com/netmqGw.(*Netmq).connMonitorForSurgemq(0x1088c400)
/home/source/source/switch/commonsrc/src/sundray.com/netmqGw/netmq.go:294 +0x350
created by sundray.com/netmqGw.(*Netmq).Init
/home/source/source/switch/commonsrc/src/sundray.com/netmqGw/netmq.go:244 +0x2bc

goroutine 23 [chan receive, 616 minutes]:
sundray.com/mqttappGw.(*mqttClient).subHandler(0x5aacc8, 0x10812dc0, 0x45c910)
/home/source/source/switch/commonsrc/src/sundray.com/mqttappGw/mqttclient.go:169 +0xf4
created by sundray.com/mqttappGw.(*mqttClient).mqttClientSub
/home/source/source/switch/commonsrc/src/sundray.com/mqttappGw/mqttclient.go:252 +0x1c0

goroutine 24 [chan receive, 616 minutes]:
sundray.com/mqttappGw.(*mqttClient).subHandler(0x5aacc8, 0x10812e00, 0x45c90c)
/home/source/source/switch/commonsrc/src/sundray.com/mqttappGw/mqttclient.go:169 +0xf4
created by sundray.com/mqttappGw.(*mqttClient).mqttClientSub
/home/source/source/switch/commonsrc/src/sundray.com/mqttappGw/mqttclient.go:252 +0x1c0

goroutine 25 [select, 616 minutes]:
main.snmpDaemon()
/home/source/source/switch/apps/snmp_passthrough/src/snmp_passthrough/main.go:181 +0xb4
created by main.main
/home/source/source/switch/apps/snmp_passthrough/src/snmp_passthrough/main.go:224 +0x240

goroutine 26 [select, 2116 minutes, locked to thread]:
runtime.gopark(0x45cd14, 0x0, 0x41837b, 0x6, 0x18, 0x2)
/usr/local/go/src/runtime/proc.go:259 +0x148
runtime.selectgoImpl(0x108a5790, 0x0, 0xc)
/usr/local/go/src/runtime/select.go:423 +0x13a8
runtime.selectgo(0x108a5790)
/usr/local/go/src/runtime/select.go:238 +0x10
runtime.ensureSigM.func1()
/usr/local/go/src/runtime/signal1_unix.go:304 +0x428
runtime.goexit()
/usr/local/go/src/runtime/asm_arm.s:998 +0x4

What did you expect to see?

no panic

What did you see instead?