my case is what Robert said.
code below could cause this err, and not recover by go:
---------------------------------------------------------------------------
s := "123"
sh := *(*reflect.StringHeader)(unsafe.Pointer(&s))
b := []byte{}
bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
bh.Data, bh.Len, bh.Cap = sh.Data, sh.Len, sh.Len
defer func(){
e := recover()
fmt.Println(e)
}()
b[0] = '4' // this line is the reason, because i modified the s variable.
----------------------------------------------------------------------
String is not mutable, and what you do is to change this, and so err-ed,
this kind of err can not be captured by recover.
you should avoid this behavior, follow the rule of String type.
On Tuesday, July 2, 2019 at 12:36:34 AM UTC+8 Robert Engels wrote:
>
> They are almost certainly caused by a 1) bug in Go, 2) improper use of
> CGO, 3) improper use of unsafe.
>
> With 3 being most likely, and most likely caused by overwriting memory
> buffers.
>
> You don't want to recover from these - need to fix the source of the
> problem. If you included more of the stack trace it might give a better
> idea of the cause of the problem.
>
>
>
> -----Original Message-----
> From: Mayank Jha
> Sent: Jul 1, 2019 11:03 AM
> To: golang-nuts
> Subject: [go-nuts] recover from a unexpected fault address
>
> unexpected fault address 0x0
> fatal error: fault
> [signal SIGSEGV: segmentation violation code=0x80 addr=0x0 pc=0xd9c026]
>
> goroutine 11707890 [running]:
> runtime.throw(0x13c74b7, 0x5)
> /usr/local/go/src/runtime/panic.go:617 +0x72 fp=0xc0080ac5f0
> sp=0xc0080ac5c0 pc=0x42f5c2
> runtime.sigpanic()
> /usr/local/go/src/runtime/signal_unix.go:397 +0x401 fp=0xc0080ac620
> sp=0xc0080ac5f0 pc=0x444cf1
>
> Is there a way one can recover from such errors ? when does such error
> happen ? Any ideas ?
>
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