freebsd regression in 1.20.1- os.Stat shows function not implemented

[JalonSolov]

What version of Go are you using (go version)?

$ go version
go version go1.19.6 linux/amd64

and

$ go version
go version go1.20.1 linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

linux/amd64

What did you do?

Test file foo.go:

package main

import (
        "fmt"
        "os"
)

func main() {
        s, err := os.Stat("foo.go")
        if err != nil {
                fmt.Println(err)
        }
        fmt.Printf("%#v\n", s)
}

On system with Go 1.19.6:

$ GOOS=freebsd go build foo.go
$ scp foo <freebsd machine>:foo.19

On system with Go 1.20.1:

$ GOOS=freebsd go build foo.go
$ scp foo <freebsd machine>:foo.20

From either system:

$ scp foo.go <freebsd machine>:

On FreeBSD system:

$ ./foo.19
...
$ ./foo.20

What did you expect to see?

Same (or at least very similar) output

What did you see instead?

$ ./foo.19
&os.fileStat{name:"foo.go", size:175, mode:0x1a4, modTime:time.Time{wall:0x7d8ca00, ext:63813798690, loc:(*time.Location)(0x53d360)}, sys:syscall.Stat_t{Dev:0x3a00ff6c, Ino:0x4aebd51, Nlink:0x1, Mode:0x81a4, Padding0:0, Uid:0x257, Gid:0x7e, Padding1:0, Rdev:0x0, Atimespec:syscall.Timespec{Sec:1678201603, Nsec:752772000}, Mtimespec:syscall.Timespec{Sec:1678201890, Nsec:131648000}, Ctimespec:syscall.Timespec{Sec:1678201890, Nsec:131648000}, Birthtimespec:syscall.Timespec{Sec:-1, Nsec:0}, Size:175, Blocks:8, Blksize:4096, Flags:0x0, Gen:0x0, Spare:[10]uint64{0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}}
$ ./foo.20
stat foo.go: function not implemented
<nil>
$

[bcmills]

(attn @golang/freebsd)

[bcmills]

What version of FreeBSD are you running?
Per https://go.dev/wiki/MinimumRequirements#freebsd, current Go releases require FreeBSD 10 or higher.

[JalonSolov]

FreeBSD <server name> 11.1-RELEASE FreeBSD 11.1-RELEASE #0

[paulzhol]

That wiki is very out of date. FreeBSD 11 is only supported by Go 1.18 (and 1.19 because we missed the merge window):
https://tip.golang.org/doc/go1.18#freebsd
Specifically for #53280.

[JalonSolov]

Gotcha... Go 1.18 was supposed to be the last version that supported FreeBSD 11, but because the merge window was missed, Go 1.19 still supported it, but support for that version is really gone in Go 1.20+.

In that case, I guess this issue can be closed. Sorry for the noise.

[paulzhol]

FreeBSD 11 support was dropped in Go 1.20, like mentioned in the ticket. 1.19 still has the compatibility shims for switching the syscall versions at runtime.
Go 1.18 was supposed to be the last, but we missed the merge window. So 1.19 is the last version with that code.

[paulzhol]

I've updated the wiki to point to https://github.com/golang/go/wiki/FreeBSD#go-on-freebsd instead.