Chances are that a parameter or structure you are passing from Go to C is getting garbage collected by Go before the C code is done with it. Read the CGO documentaton – it's dense, but every sentence, every word, has a purpose.
In case it helps, take a look at the video of my recent talk at FOSDEM 2020 in Brussels (https://fosdem.org/2020/schedule/event/dragonscgo/); slides at https://docs.yottadb.com/Presentations/200202-1DragonsofCGOFOSDEM.pdf Regards – Bhaskar On Monday, February 17, 2020 at 9:33:00 AM UTC-5, Nitish Saboo wrote: > > Hi, > > This is my go env: > > nsaboo@ubuntu:~$ go version > go version go1.12.4 linux/amd64 > nsaboo@ubuntu:~$ go env > GOARCH="amd64" > GOBIN="" > GOCACHE="/home/nsaboo/.cache/go-build" > GOEXE="" > GOFLAGS="" > GOHOSTARCH="amd64" > GOHOSTOS="linux" > GOOS="linux" > GOPATH="/home/nsaboo/Documents/goworkspace" > 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-build659816641=/tmp/go-build > -gno-record-gcc-switches" > > 'go build -v -x main.go' went through fine and the binary(main) was > created successfully. > > While making a cgo call from go code to C code I am getting the following > error: > > nsaboo@ubuntu:~/Documents/goworkspace/src/poc$ ./main > GOMAZPROCS : 2 > START > DIR: /home/nsaboo/Documents/goworkspace/src/poc > Reached C module path :/usr/local/lib/syslog-ng > Reached C filepath > :/home/nsaboo/Documents/goworkspace/src/poc/patterns_test.xml > Printing patterndb address: 0x151e1e0 > Just before parsing > fatal error: unexpected signal during runtime execution > [signal SIGSEGV: segmentation violation code=0x1 addr=0xffffffff04d07885 > pc=0x7fe62f2d2922] > > runtime stack: > runtime.throw(0x4f7e77, 0x2a) > /usr/local/go/src/runtime/panic.go:617 +0x72 > runtime.sigpanic() > /usr/local/go/src/runtime/signal_unix.go:374 +0x4a9 > > goroutine 1 [syscall]: > runtime.cgocall(0x4b7380, 0xc000044d90, 0xc0000a8000) > /usr/local/go/src/runtime/cgocall.go:128 +0x5b fp=0xc000044d60 > sp=0xc000044d28 pc=0x404f4b > main._Cfunc_match(0x16e3880, 0x16c, 0x154d680, 0x7) > _cgo_gotypes.go:165 +0x45 fp=0xc000044d90 sp=0xc000044d60 pc=0x4b4825 > main.Syslogparser.ParseMessage(0xc0000a4000, 0x3c, 0x4f47dd, 0x18, > 0xc0000a6000, 0x0, 0x7, 0x4f915f, 0x16c) > /home/nsaboo/Documents/goworkspace/src/poc/main.go:120 +0x12c > fp=0xc000044e10 sp=0xc000044d90 pc=0x4b56ec > main.main() > /home/nsaboo/Documents/goworkspace/src/poc/main.go:219 +0x3c1 > fp=0xc000044f98 sp=0xc000044e10 pc=0x4b6031 > runtime.main() > /usr/local/go/src/runtime/proc.go:200 +0x20c fp=0xc000044fe0 > sp=0xc000044f98 pc=0x42cd7c > runtime.goexit() > /usr/local/go/src/runtime/asm_amd64.s:1337 +0x1 fp=0xc000044fe8 > sp=0xc000044fe0 pc=0x4548a1 > > 1)How can I debug this error further ? > > 2)What could be the reason for this error ? > > Thanks, > Nitish > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/4ce0c9a3-9ed7-4408-9d49-d8b0b2960ea4%40googlegroups.com.
