Re: defuncted printf process when using wpa_supplicant

[Greg Wooledge]

On Wed, Mar 30, 2022 at 07:40:22AM +0200, Alex fxmbsw7 Ratchev wrote:
> i do
> 
> wpa_supplicant -i"$if" -c<( printf %s\\n \
> 'network={' "ssid=\"$ssid\"" "psk=\"$pass\"" '}'
> ) &
> { sleep 3 ; dhclient "$if" ; } &
> 
> which is simply wpa_supplicant -iiface -c<( conf file printing )
> 
> it since years resuts in such : i think before it said printf defuncted
> 
> 
> root      1528  0.0  0.0  12388  8656 ?        S    07:19   0:01
> wpa_supplicant -iwlo1 -c/dev/fd/63
> root      1530  0.0  0.0      0     0 ?        Z    07:19   0:00  \_
> [3.wpa] <defunct>

Whatever ps command you're using here isn't showing the parent process
ID.  You'll need the parent PID to know which program isn't cleaning
up its defunct children (zombies).

The "-f" (SysV-ish) option to Linux's ps command will show it:

unicorn:~$ ps -fp $$
UID          PID    PPID  C STIME TTY          TIME CMD
greg         999     981  0 Mar26 pts/3    00:00:00 bash

You appear to be using the "f" (BSD-ish) option which shows processes
in a tree-like structure, but I can't tell from your pasted excerpt
whether wpa_supplicant is actually the parent of the zombie, due to
the lack of the PPID field.

If it turns out that wpa_supplicant is the parent, then that's the
responsible party, and that's where you should send your bug reports.