delve
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go-delve
call function: fatal error: fault
dlv version
$ go version
go version go1.24.0 windows/amd64
$ dlv version
Delve Debugger
Version: 1.24.0
Build: 06b95cdd340b02f3e3a9fe5b42c06467e0462434
main.go :
package main
import (
"fmt"
"strings"
)
func main() {
u := Address{Addr: "127.0.0.1"}
fmt.Println(u) // line 10
}
type Address struct {
TLS bool
Addr string
}
func (a Address) String() string {
sb := new(strings.Builder)
sb.WriteString(a.Addr)
return sb.String()
}
$ dlv debug
(dlv) break main.go:10
Breakpoint 1 set at 0x21dcba for main.main() D:/mypath/main/main.go:10
(dlv) c
> [Breakpoint 1] main.main() D:/mypath/main/main.go:10 (hits goroutine(1):1 total:1) (PC: 0x21dcba)
5: "strings"
6: )
7:
8: func main() {
9: u := Address{Addr: "127.0.0.1"}
=> 10: fmt.Println(u)
11: }
12:
13: type Address struct {
14: TLS bool
15: Addr string
(dlv) call u.String()
unexpected fault address 0x418141
> [runtime-fatal-throw] runtime.throw() D:/Programs/go/src/runtime/panic.go:1087 (hits goroutine(7):1 total:1) (PC: 0x1cfac4)
Warning: debugging optimized function
1082: // Do not remove or change the type signature.
1083: // See go.dev/issue/67401.
1084: //
1085: //go:linkname throw
1086: //go:nosplit
=>1087: func throw(s string) {
1088: // Everything throw does should be recursively nosplit so it
1089: // can be called even when it's unsafe to grow the stack.
1090: systemstack(func() {
1091: print("fatal error: ")
1092: printindented(s) // logically printpanicval(s), but avoids convTstring write barrier
(dlv)
