runtime: panic in net/http.(*Server).Serve

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黃翔蔚

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Nov 25, 2019, 12:23:59 PM11/25/19
to golang-nuts
My program will get panic issue from time to time.
I don't have procedure to reproduce this issue.
So far, the issue is happen on 10/23, 10/25, 10/30, 11/14 and 11/22.
In the last try, I capture packets by wireshark, it seems no packet incoming when panic.
I also try go build -race. There is no useful clues in crash dump.
Any suggestion is welcome.

go version go1.12.7 linux/amd64

go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/ubuntu/.cache/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOOS="linux"
GOPATH="/home/ubuntu/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build954623632=/tmp/go-build -gno-record-gcc-switches"

execption dump on 20191122 17:01:21(the program is auto bring up by crontab in 10 seconds. The actually issue is 17:01:11~17:01:21):
[GIN] 2019/11/22 - 08:33:29 | 404 |         486ns |   38.21.245.102 | GET      /
[GIN] 2019/11/22 - 08:33:29 | 404 |         864ns |   38.21.245.102 | GET      /HNAP1/
[GIN] 2019/11/22 - 09:20:16 | 404 |       1.066µs |   94.242.26.158 | GET      /
[GIN] 2019/11/22 - 10:07:25 | 404 |         482ns |  107.189.11.148 | GET      /script
[GIN] 2019/11/22 - 10:19:53 | 404 |         918ns |    80.82.70.187 | GET      /cache/global/img/gs.gif
[GIN] 2019/11/22 - 11:20:51 | 404 |         774ns | 218.214.116.175 | GET      /
[GIN] 2019/11/22 - 11:56:36 | 404 |         485ns |   43.255.216.26 | GET      /
[GIN] 2019/11/22 - 12:09:17 | 404 |         450ns | 170.245.173.234 | GET      /
[GIN] 2019/11/22 - 12:41:12 | 404 |         728ns |    109.1.110.70 | GET      /
[GIN] 2019/11/22 - 13:16:05 | 404 |         698ns |  216.218.206.68 | GET      /
[GIN] 2019/11/22 - 13:40:07 | 404 |         753ns |  187.102.57.223 | GET      /
[GIN] 2019/11/22 - 15:04:29 | 404 |         554ns |    119.61.6.133 | GET      /
[GIN] 2019/11/22 - 15:24:29 | 404 |         822ns |  103.249.181.40 | GET      /
runtime: unexpected return pc for net/http.(*Server).Serve called from 0x0
stack: frame={sp:0xc000137d78, fp:0xc000137e40} stack=[0xc000137000,0xc000138000)
000000c000137c78:  000000000000000c  000000c000137cc0 
000000c000137c88:  0000000000535948 <net.(*TCPListener).AcceptTCP+72>  000000c0002cc088 
000000c000137c98:  000000c00002ca00  000000000040e169 <runtime.mallocgc+745> 
000000c000137ca8:  000000c000098780  00000000000000a0 
000000c000137cb8:  000000c000137d00  000000c000137d30 
000000c000137cc8:  0000000000b24686 <go-template/vendor/github.com/fvbock/endless.(*endlessListener).Accept+70>  000000c0002cc088 
000000c000137cd8:  00000000ea73cddc  62f827d6a4dee03e 
000000c000137ce8:  000000000044e458 <time.now+56>  000d4614f8da2885 
000000c000137cf8:  000000c016ed78e0  16ed78e000137d38 
000000c000137d08:  000000005dd78357  000000c000137d38 
000000c000137d18:  00000000004b7d56 <time.Now+38>  000000005dd78357 
000000c000137d28:  000000000043908f <runtime.newproc+111>  000000c000137d68 
000000c000137d38:  0000000000763d3c <net/http.(*onceCloseListener).Accept+60>  000000c000296140 
000000c000137d48:  000000c000137d88  0000000000000018 
000000c000137d58:  000000c000498780  000000000073fd54 <net/http.(*Server).Serve+756> 
000000c000137d68:  000000c000137e30  000000000073fc8d <net/http.(*Server).Serve+557> 
000000c000137d78: <000000c000402480  0000000000e13940 
000000c000137d88:  000000c000098780  0000000000f46000 
000000c000137d98:  000000c000402540  000000c0003f9200 
000000c000137da8:  0000000000f46000  000000c000402540 
000000c000137db8:  0000000000000000  0000000000f53a20 
000000c000137dc8:  000000000042f231 <runtime.deferreturn+145>  0000000000f46000 
000000c000137dd8:  000000c000296b00  00000000004735fe <sync.(*RWMutex).Unlock+126> 
000000c000137de8:  0000000d00402540  000000c000138b38 
000000c000137df8:  00007f7950798330  0000000000000001 
000000c000137e08:  0000000000000000  000000c000582000 
000000c000137e18:  000000c000000000  0000000000008000 
000000c000137e28:  0000000000000000  0000000000000000 
000000c000137e38: !0000000000000000 >0000000000000212 
000000c000137e48:  0000000000000070  0000000000000002 
000000c000137e58:  0000000000000001  0000000000000049 
000000c000137e68:  0000000000000025  000000c0000f4070 
000000c000137e78:  000000c000138b38  000000c00002ca00 
000000c000137e88:  0000000000000067  ffffffffffffffe0 
000000c000137e98:  00000000004aba60 <syscall.Syscall+48>  000000c000138ae8 
000000c000137ea8:  00000000004aba60 <syscall.Syscall+48>  0000000000000212 
000000c000137eb8:  0000000000000033  0000000000000000 
000000c000137ec8:  0000000000000000  0000000000000000 
000000c000137ed8:  0000000000000000  000000c000137fc0 
000000c000137ee8:  0000000000000000  0000000000000000 
000000c000137ef8:  0000000000f42fc0  000000000000000c 
000000c000137f08:  000000c000304120  000000c0002cc088 
000000c000137f18:  000000c000285000  0000000000f1b660 
000000c000137f28:  0000000000000000  0000000000f1b630 
000000c000137f38:  000000c000137f70 
fatal error: unknown caller pc

runtime stack:
runtime.throw(0xde01c3, 0x11)
/usr/local/go/src/runtime/panic.go:617 +0x72
runtime.gentraceback(0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xc000498780, 0x0, 0x0, 0x7fffffff, 0x7f794b46cb08, 0x0, 0x0, ...)
/usr/local/go/src/runtime/traceback.go:275 +0x1cd1
runtime.scanstack(0xc000498780, 0xc00002dc70)
/usr/local/go/src/runtime/mgcmark.go:711 +0x15f
runtime.scang(0xc000498780, 0xc00002dc70)
/usr/local/go/src/runtime/proc.go:888 +0x1e4
runtime.markroot.func1()
/usr/local/go/src/runtime/mgcmark.go:221 +0x6e
runtime.markroot(0xc00002dc70, 0x7f790000001b)
/usr/local/go/src/runtime/mgcmark.go:202 +0x2e9
runtime.gcDrain(0xc00002dc70, 0x3)
/usr/local/go/src/runtime/mgcmark.go:899 +0x112
runtime.gcBgMarkWorker.func2()
/usr/local/go/src/runtime/mgc.go:1903 +0x80
runtime.systemstack(0x0)
/usr/local/go/src/runtime/asm_amd64.s:351 +0x66
runtime.mstart()
/usr/local/go/src/runtime/proc.go:1153

goroutine 50 [GC worker (idle), 2 minutes]:
runtime.systemstack_switch()
/usr/local/go/src/runtime/asm_amd64.s:311 fp=0xc0002d0760 sp=0xc0002d0758 pc=0x45aa40
runtime.gcBgMarkWorker(0xc00002ca00)
/usr/local/go/src/runtime/mgc.go:1890 +0x1be fp=0xc0002d07d8 sp=0xc0002d0760 pc=0x41e4be
runtime.goexit()
/usr/local/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc0002d07e0 sp=0xc0002d07d8 pc=0x45cb11
created by runtime.gcBgMarkStartWorkers
/usr/local/go/src/runtime/mgc.go:1784 +0x77

goroutine 1 [IO wait, 4 minutes]:
internal/poll.runtime_pollWait(0x7f7949bf7ec8, 0x72, 0x0)
/usr/local/go/src/runtime/netpoll.go:182 +0x56
internal/poll.(*pollDesc).wait(0xc000331d18, 0x72, 0x0, 0x0, 0xdd741e)
/usr/local/go/src/internal/poll/fd_poll_runtime.go:87 +0x9b
internal/poll.(*pollDesc).waitRead(...)
/usr/local/go/src/internal/poll/fd_poll_runtime.go:92
internal/poll.(*FD).Accept(0xc000331d00, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
/usr/local/go/src/internal/poll/fd_unix.go:384 +0x1ba
net.(*netFD).accept(0xc000331d00, 0x7f7950a013b8, 0x203000, 0x203000)
/usr/local/go/src/net/fd_unix.go:238 +0x42
net.(*TCPListener).accept(0xc00055cfb8, 0xc00002a500, 0x40e169, 0xc000098780)
/usr/local/go/src/net/tcpsock_posix.go:139 +0x32
net.(*TCPListener).AcceptTCP(0xc00055cfb8, 0x83e35326, 0xa0df53898b7b9c8, 0x44e458)
/usr/local/go/src/net/tcpsock.go:247 +0x48
go-template/vendor/github.com/fvbock/endless.(*endlessListener).Accept(0xc0003fb100, 0xc00052bab0, 0x18, 0xc000000180, 0x73fd54)
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/fvbock/endless/endless.go:490 +0x46
net/http.(*Server).Serve(0xc000383b00, 0xf41bc0, 0xc0003fb100, 0x0, 0x0)
/usr/local/go/src/net/http/server.go:2859 +0x22d
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/fvbock/endless/endless.go:195 +0xec
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/fvbock/endless/endless.go:229 +0x1bf
go-template/vendor/github.com/fvbock/endless.ListenAndServe(0xc000284f90, 0xc, 0xf30cc0, 0xc0003839e0, 0xf56ce0, 0xc0003839e0)
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/fvbock/endless/endless.go:153 +0x57
go-template/fcs-go/http.Start()
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/http/http.go:40 +0x1f2
go-template/fcs-go/cmd.startServices()
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/cmd/root.go:70 +0xe0
go-template/fcs-go/cmd.glob..func1(0x16fb2e0, 0xc000296ea0, 0x0, 0x2)
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/cmd/root.go:85 +0x33
go-template/vendor/github.com/spf13/cobra.(*Command).execute(0x16fb2e0, 0xc000020190, 0x2, 0x2, 0x16fb2e0, 0xc000020190)
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/spf13/cobra/command.go:766 +0x2ae
go-template/vendor/github.com/spf13/cobra.(*Command).ExecuteC(0x16fb2e0, 0xc0001adf68, 0xbfc7ee, 0x16fb2e0)
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/spf13/cobra/command.go:852 +0x2ec
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/spf13/cobra/command.go:800
go-template/fcs-go/cmd.Execute()
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/cmd/root.go:92 +0x32
main.main()
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/main.go:8 +0x20

goroutine 18 [syscall, 22848 minutes]:
os/signal.signal_recv(0x0)
/usr/local/go/src/runtime/sigqueue.go:139 +0x9c
os/signal.loop()
/usr/local/go/src/os/signal/signal_unix.go:23 +0x22
created by os/signal.init.0
/usr/local/go/src/os/signal/signal_unix.go:29 +0x41

goroutine 20 [select, 14530 minutes]:
go-template/fcs-go/http/v1.(*Hub).run(0xc000294b80)
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/http/v1/alarm.go:126 +0x240
created by go-template/fcs-go/http/v1.init.0
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/http/v1/alarm.go:43 +0x41

goroutine 21 [sleep, 2 minutes]:
runtime.goparkunlock(...)
/usr/local/go/src/runtime/proc.go:307
time.Sleep(0x2540be400)
/usr/local/go/src/runtime/time.go:105 +0x159
go-template/fcs-go/http/v1.listen()
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/http/v1/alarm.go:90 +0xf4
created by go-template/fcs-go/http/v1.init.0
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/http/v1/alarm.go:44 +0x59

goroutine 35 [select, 22848 minutes]:
database/sql.(*DB).connectionOpener(0xc0002fc0c0, 0xf45f40, 0xc0002c8040)
/usr/local/go/src/database/sql/sql.go:1000 +0xe8
created by database/sql.OpenDB
/usr/local/go/src/database/sql/sql.go:670 +0x15e

goroutine 36 [select, 1014 minutes]:
database/sql.(*DB).connectionResetter(0xc0002fc0c0, 0xf45f40, 0xc0002c8040)
/usr/local/go/src/database/sql/sql.go:1013 +0xfb
created by database/sql.OpenDB
/usr/local/go/src/database/sql/sql.go:671 +0x194

goroutine 10 [chan receive, 2 minutes]:
go-template/fcs-go/models.InitScheduling.func1(0xc00021a570)
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/models/scheduling.go:430 +0x58
created by go-template/fcs-go/models.InitScheduling
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/models/scheduling.go:427 +0xe0

goroutine 11 [IO wait, 99 minutes]:
internal/poll.runtime_pollWait(0x7f7949bf8068, 0x72, 0x0)
/usr/local/go/src/runtime/netpoll.go:182 +0x56
internal/poll.(*pollDesc).wait(0xc0003c2098, 0x72, 0x0, 0x0, 0xdd741e)
/usr/local/go/src/internal/poll/fd_poll_runtime.go:87 +0x9b
internal/poll.(*pollDesc).waitRead(...)
/usr/local/go/src/internal/poll/fd_poll_runtime.go:92
internal/poll.(*FD).Accept(0xc0003c2080, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
/usr/local/go/src/internal/poll/fd_unix.go:384 +0x1ba
net.(*netFD).accept(0xc0003c2080, 0x7f7950a013b8, 0x203000, 0x203000)
/usr/local/go/src/net/fd_unix.go:238 +0x42
net.(*TCPListener).accept(0xc0002cc078, 0xc000028000, 0x40e169, 0xc000098780)
/usr/local/go/src/net/tcpsock_posix.go:139 +0x32
net.(*TCPListener).AcceptTCP(0xc0002cc078, 0x12f91435, 0x3af71f9f9ea876bd, 0x44e458)
/usr/local/go/src/net/tcpsock.go:247 +0x48
go-template/vendor/github.com/fvbock/endless.(*endlessListener).Accept(0xc000296100, 0xc00013bd88, 0x18, 0xc000498600, 0x73fd54)
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/fvbock/endless/endless.go:490 +0x46
net/http.(*Server).Serve(0xc0003e7c20, 0xf41bc0, 0xc000296100, 0x0, 0x0)
/usr/local/go/src/net/http/server.go:2859 +0x22d
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/fvbock/endless/endless.go:195 +0xec
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/fvbock/endless/endless.go:229 +0x1bf
go-template/vendor/github.com/fvbock/endless.ListenAndServe(0xc000284ff0, 0xc, 0xf30cc0, 0xc0003e7b00, 0xf56ce0, 0xc0003e7b00)
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/fvbock/endless/endless.go:153 +0x57
go-template/fcs-go/http.StartTPKDataRouter()
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/http/http.go:101 +0x1c6
created by go-template/fcs-go/http.Start
/home/jessica/0909/go-template/.workspace/src/go-template/fcs-go/http/http.go:20 +0x39

goroutine 12 [IO wait (scan), 140 minutes]:
internal/poll.runtime_pollWait(0x7f7949bf7f98, 0x72, 0x0)
/usr/local/go/src/runtime/netpoll.go:182 +0x56
internal/poll.(*pollDesc).wait(0xc000022218, 0x72, 0x0, 0x0, 0xdd741e)
/usr/local/go/src/internal/poll/fd_poll_runtime.go:87 +0x9b
internal/poll.(*pollDesc).waitRead(...)
/usr/local/go/src/internal/poll/fd_poll_runtime.go:92
internal/poll.(*FD).Accept(0xc000022200, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0)
/usr/local/go/src/internal/poll/fd_unix.go:384 +0x1ba
net.(*netFD).accept(0xc000022200, 0x7f7950a013b8, 0x203000, 0x203000)
/usr/local/go/src/net/fd_unix.go:238 +0x42
net.(*TCPListener).accept(0xc0002cc088, 0xc00002ca00, 0x40e169, 0xc000098780)
/usr/local/go/src/net/tcpsock_posix.go:139 +0x32
net.(*TCPListener).AcceptTCP(0xc0002cc088, 0xea73cddc, 0x62f827d6a4dee03e, 0x44e458)
/usr/local/go/src/net/tcpsock.go:247 +0x48
go-template/vendor/github.com/fvbock/endless.(*endlessListener).Accept(0xc000296140, 0xc000137d88, 0x18, 0xc000498780, 0x73fd54)
/home/jessica/0909/go-template/.workspace/src/go-template/vendor/github.com/fvbock/endless/endless.go:490 +0x46
fatal error: unexpected signal during runtime execution
panic during panic
[signal SIGSEGV: segmentation violation code=0x1 addr=0x119 pc=0x451543]

runtime stack:
runtime.throw(0xdf459e, 0x2a)
/usr/local/go/src/runtime/panic.go:617 +0x72
runtime.sigpanic()
/usr/local/go/src/runtime/signal_unix.go:374 +0x4a9
runtime.gentraceback(0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xc000498780, 0x0, 0x0, 0x64, 0x0, 0x0, 0x0, ...)
/usr/local/go/src/runtime/traceback.go:263 +0x15d3
runtime.traceback1(0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xc000498780, 0x0)
/usr/local/go/src/runtime/traceback.go:746 +0xf1
runtime.traceback(0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xc000498780)
/usr/local/go/src/runtime/traceback.go:700 +0x52
runtime.tracebackothers(0xc000001200)
/usr/local/go/src/runtime/traceback.go:953 +0x1a8
runtime.dopanic_m(0xc000001200, 0x42fc12, 0x7f794b46c770, 0x1)
/usr/local/go/src/runtime/panic.go:817 +0x2a0
runtime.fatalthrow.func1()
/usr/local/go/src/runtime/panic.go:672 +0x5f
runtime.fatalthrow()
/usr/local/go/src/runtime/panic.go:669 +0x57
runtime.throw(0xde01c3, 0x11)
/usr/local/go/src/runtime/panic.go:617 +0x72
runtime.gentraceback(0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xc000498780, 0x0, 0x0, 0x7fffffff, 0x7f794b46cb08, 0x0, 0x0, ...)
/usr/local/go/src/runtime/traceback.go:275 +0x1cd1
runtime.scanstack(0xc000498780, 0xc00002dc70)
/usr/local/go/src/runtime/mgcmark.go:711 +0x15f
runtime.scang(0xc000498780, 0xc00002dc70)
/usr/local/go/src/runtime/proc.go:888 +0x1e4
runtime.markroot.func1()
/usr/local/go/src/runtime/mgcmark.go:221 +0x6e
runtime.markroot(0xc00002dc70, 0x7f790000001b)
/usr/local/go/src/runtime/mgcmark.go:202 +0x2e9
runtime.gcDrain(0xc00002dc70, 0x3)
/usr/local/go/src/runtime/mgcmark.go:899 +0x112
runtime.gcBgMarkWorker.func2()
/usr/local/go/src/runtime/mgc.go:1903 +0x80
runtime.systemstack(0x0)
/usr/local/go/src/runtime/asm_amd64.s:351 +0x66
runtime.mstart()
/usr/local/go/src/runtime/proc.go:1153
[  [0;32minfo [0m ] 17:01:22 (checkPointMappingList.go:136) checkPointMpList:

panic_20191122_170121.pcap

Ian Lance Taylor

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Nov 25, 2019, 2:12:06 PM11/25/19
to 黃翔蔚, golang-nuts
On Mon, Nov 25, 2019 at 9:23 AM 黃翔蔚 <waterh...@gmail.com> wrote:
>
> My program will get panic issue from time to time.
> I don't have procedure to reproduce this issue.
> So far, the issue is happen on 10/23, 10/25, 10/30, 11/14 and 11/22.
> In the last try, I capture packets by wireshark, it seems no packet incoming when panic.
> I also try go build -race. There is no useful clues in crash dump.
> Any suggestion is welcome.

The most common cause for this kind of problem is memory corruption.
Run your program under the race detector. Look closely at any uses of
unsafe or cgo.

Ian

黃翔蔚

unread,
Nov 25, 2019, 8:10:22 PM11/25/19
to golang-nuts
Hi lan,
Thanks for your reply.
I built the program with -race option. There is no news in crash dump.
I will review cgo portion again. Thanks again.

Walter

Ian Lance Taylor於 2019年11月26日星期二 UTC+8上午3時12分06秒寫道：

Robert Engels

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Nov 25, 2019, 8:16:42 PM11/25/19
to 黃翔蔚, golang-nuts
I think with -race you want to exit before it crashes. After running a while. Can’t remember though. Check the docs. 

On Nov 25, 2019, at 7:10 PM, 黃翔蔚 <waterh...@gmail.com> wrote:


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黃翔蔚

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Nov 26, 2019, 1:18:32 AM11/26/19
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Hi Robert,
I don't understand what you mean. Could you please explain more detail?
Thanks.

Walter

Robert Engels於 2019年11月26日星期二 UTC+8上午9時16分42秒寫道：
I think with -race you want to exit before it crashes. After running a while. Can’t remember though. Check the docs. 

On Nov 25, 2019, at 7:10 PM, 黃翔蔚 <waterh...@gmail.com> wrote:


Hi lan,
Thanks for your reply.
I built the program with -race option. There is no news in crash dump.
I will review cgo portion again. Thanks again.

Walter

Ian Lance Taylor於 2019年11月26日星期二 UTC+8上午3時12分06秒寫道：
On Mon, Nov 25, 2019 at 9:23 AM 黃翔蔚 <waterh...@gmail.com> wrote:
>
> My program will get panic issue from time to time.
> I don't have procedure to reproduce this issue.
> So far, the issue is happen on 10/23, 10/25, 10/30, 11/14 and 11/22.
> In the last try, I capture packets by wireshark, it seems no packet incoming when panic.
> I also try go build -race. There is no useful clues in crash dump.
> Any suggestion is welcome.

The most common cause for this kind of problem is memory corruption.
Run your program under the race detector.  Look closely at any uses of
unsafe or cgo.

Ian

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Robert Engels

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Nov 26, 2019, 1:31:55 AM11/26/19
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It looks like the race detector outputs when it detects a race, not at program end, so it doesn’t apply in your case. 

So, I would look into cgo and other unsafe usages. 
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黃翔蔚

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Nov 26, 2019, 4:21:36 AM11/26/19
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Hi Robert,
Thanks for the explanation. 
There is only one function call from GO to CPP in the program.
I printf all parameters in the CPP function.
There is no memory corruption inside.
If you have any other troubleshooting suggestions, I would appreciate it.

Walter

Robert Engels於 2019年11月26日星期二 UTC+8下午2時31分55秒寫道：

Robert Engels

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Nov 26, 2019, 8:40:49 AM11/26/19
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Just because you print all of the parameters and they’re ok doesn’t mean there isn’t any corruption. Sorry I can’t be of more help. 
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