kill -9 doesn't work for .exe launched from WSL

[bagajjal]

• Your Windows build number: (Type ver at a Windows Command Prompt)
  Microsoft Windows [Version 10.0.15063]

• What you're doing and what's happening: (Copy&paste specific commands and their output, or include screen shots)

1. launch notepad.exe in background (notepad.exe &)
2. the PID on WSL and windows taskmanager differs..
3. in bash.exe, get the processId using
   ps -eaf | grep notepad.exe
4. kill -9
5. ps -eaf | grep notepad.exe shows the process as killed but the process is alive (task manager also shows the process alive).

• What's wrong / what should be happening instead:
  kill -9 should kill the process

[therealkenc]

#2151, #1614, #2110 (sorta)

[benhillis]

Marking as a duplicate.