runtime: probably excessive garbage collection on objects using finalizer #14910
Description
Please answer these questions before submitting your issue. Thanks!
- What version of Go are you using (
go version)?
tip through go1.4 - What operating system and processor architecture are you using (
go env)?
{dragonfly,freebsd,linux,openbsd,netbsd}/amd64 - What did you do?
ran the following snippet:
package main
import (
"fmt"
"net"
"runtime"
"syscall"
)
func main() {
c, err := net.ListenPacket("udp4", "0.0.0.0:0")
if err != nil {
fmt.Println(err)
return
}
f, err := c.(*net.UDPConn).File()
c.Close()
if err != nil {
fmt.Println(err)
return
}
//defer f.Close()
s := int(f.Fd())
for i := 0; ; i++ {
soerr, err := syscall.GetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_ERROR)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(i, soerr)
runtime.GC()
}
}
- What did you expect to see?
no error output - What did you see instead?
0 0
1 0
[...]
bad file descriptor