Github user scw00 commented on the issue:
https://github.com/apache/trafficserver/issues/1531
There are reasons for this creash:
1ãATS try to connect the origin server, but receive RST package. So ATS
try again until retry_times == 0. It will clean the server_entry (mark the VC
as closed, remove this VC from write_ready_list and read_ready_list, then close
it) in every times except the last one(It is easy to re-product), so it will
call both read sm and write sm in the last times, and the write sm causes crash.
2ãEpoll trigger EPOLLERR without EVENTIO_READ(hard to re-product).
In my opinion, the EPOLLERR always with read.enabled or
write.enabled(otherwise, there is no sm could handle this event, we just
ignore). So when EPOLLERR happens, we could push the vc into read_ready_list if
the read.enabled == 1, otherwise push it into write_ready_list.
By the way, there is my program to re-product this crash:
```
package main
import (
"net"
"os"
"fmt"
)
func main() {
ls, err := net.Listen("tcp", os.Args[1])
if err != nil {
fmt.Println(err)
os.Exit(1)
}
for {
conn, err := ls.Accept()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
go handleConnection(conn)
}
}
func handleConnection(con net.Conn) {
con.Close()
}
```
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