[Libguestfs] golang: panic: runtime error: cgo argument has Go pointer to Go pointer

Hello, when i use libguestfs to ceph rbd by golang, but there has panic: panic: runtime error: cgo argument has Go pointer to Go pointer goroutine 1 [running]: guestfs.(*Guestfs).Add_drive.func11(0xc000010028, 0xcda6a0, 0xc0000d6000, 0xc000090280) /opt/gopath/src/guestfs/guestfs.go:1440 +0xc2 guestfs.(*Guestfs).Add_drive(0xc000010028, 0x7ffd4b5d67ff, 0xd, 0xc00008d9d8, 0x0) /opt/gopath/src/guestfs/guestfs.go:1440 +0x1b2 main.OpenImage(0x7ffd4b5d67ff, 0xd, 0x0, 0x0, 0x42110b, 0x7c87e0, 0x4f41e0) /opt/gopath/src/disk/disk.go:34 +0x371 main.resizeext4(0x7ffd4b5d67ff, 0xd, 0x0, 0x0) /opt/gopath/src/disk/disk.go:677 +0x60 main.main() /opt/gopath/src/disk/disk.go:970 +0x5e5 i found struct in guestfs.h struct guestfs_add_drive_opts_argv { ... char *const *server; ... } so i make a daemon to test. has the same error. how could i to use libguestfs to connect ceph rbd use golang interface. package main /* #include <stdio.h> #include <string.h> struct t_server { const char *protocol; char *const *addr; }; void show(struct t_server *optargs) { if (optargs->protocol == NULL){ printf("protocol is null \n"); } printf("proto is %s\n", optargs->protocol); int num = strlen(*optargs->addr)-1; int i = 0; for(i=0;i<num;i++){ printf("%s\n",optargs->addr[i]); } } */ import "C" import ( "unsafe" ) func main(){ c_optargs := C.struct_t_server{} c_optargs.protocol = C.CString("test") serverlist := []string{"aaa", "bbb", "ccc"} var buf []*C.char for i, _ := range serverlist { buf = append(buf, (*C.char)(unsafe.Pointer(C.CString(serverlist[i])))) } buf = append(buf, (*C.char)(unsafe.Pointer(nil))) c_optargs.addr = &buf[0] C.show(&c_optargs) }