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Author: tilt!
Date:  
To: dng
Subject: Re: [DNG] BUG: zombies increase while running netman
Hi Edward,

every subprocess that is started must be "waited on" for proper
completion, or else it never terminates and becomes a zombie.

In backend.pas, in function run_backend(), either use the option
poWaitOnExit when creating AProcess or use the method
WaitOnExit() after the output has been read from the backend.

Kind regards,
T.


On 08/29/2015 10:41 PM, Edward Bartolo wrote:
> Running "ps -e" while netman runs for a some time results in zombies as follows:
>
> edbarx@edbarx-pc:~$ ps -e
>    PID TTY          TIME CMD
>      1 ?        00:00:00 init
>      2 ?        00:00:00 kthreadd
>      3 ?        00:00:05 ksoftirqd/0
>      5 ?        00:00:00 kworker/0:0H
>      7 ?        00:00:12 rcu_sched
>      8 ?        00:00:00 rcu_bh
>      9 ?        00:00:00 migration/0
>     10 ?        00:00:00 watchdog/0
>     11 ?        00:00:00 watchdog/1
>     12 ?        00:00:00 migration/1
>     13 ?        00:00:06 ksoftirqd/1
>     15 ?        00:00:00 kworker/1:0H
>     16 ?        00:00:00 khelper
>     17 ?        00:00:00 kdevtmpfs
>     18 ?        00:00:00 netns
>     19 ?        00:00:00 khungtaskd
>     20 ?        00:00:00 writeback
>     21 ?        00:00:00 ksmd
>     22 ?        00:00:00 khugepaged
>     23 ?        00:00:00 crypto
>     24 ?        00:00:00 kintegrityd
>     25 ?        00:00:00 bioset
>     26 ?        00:00:00 kblockd
>     29 ?        00:00:00 kswapd0
>     30 ?        00:00:00 fsnotify_mark
>     36 ?        00:00:00 kthrotld
>     37 ?        00:00:00 ipv6_addrconf
>     39 ?        00:00:00 deferwq
>     75 ?        00:00:00 khubd
>     76 ?        00:00:00 acpi_thermal_pm
>     77 ?        00:00:00 ata_sff
>     78 ?        00:00:00 scsi_eh_0
>     79 ?        00:00:00 scsi_tmf_0
>     80 ?        00:00:00 scsi_eh_1
>     81 ?        00:00:00 scsi_tmf_1
>     85 ?        00:00:00 scsi_eh_2
>     86 ?        00:00:00 scsi_tmf_2
>     87 ?        00:00:00 scsi_eh_3
>     88 ?        00:00:00 scsi_tmf_3
>     95 ?        00:00:00 kworker/1:1H
>     96 ?        00:00:00 kworker/0:1H
>    118 ?        00:00:00 jbd2/sda9-8
>    119 ?        00:00:00 ext4-rsv-conver
>    309 ?        00:00:00 udevd
>    359 ?        00:00:00 hd-audio0
>    368 ?        00:00:00 kpsmoused
>    389 ?        00:00:00 cfg80211
>   1277 ?        00:00:00 rpcbind
>   1305 ?        00:00:00 rpc.statd
>   1310 ?        00:00:00 rpciod
>   1312 ?        00:00:00 nfsiod
>   1319 ?        00:00:00 rpc.idmapd
>   1555 ?        00:00:00 rsyslogd
>   1597 ?        00:00:00 atd
>   1643 ?        00:00:00 acpid
>   1665 ?        00:00:00 cron
>   1726 ?        00:00:00 dbus-daemon
>   1919 ?        00:00:05 xchat
>   1965 ?        00:00:00 exim4
>   1985 ?        00:00:00 slim
>   2011 tty7     00:09:19 Xorg
>   2012 tty1     00:00:00 getty
>   2013 tty2     00:00:00 getty
>   2014 tty3     00:00:00 getty
>   2015 tty4     00:00:00 getty
>   2016 tty5     00:00:00 getty
>   2017 tty6     00:00:00 getty
>   2030 ?        00:00:00 kauditd
>   2032 ?        00:00:00 console-kit-dae
>   2099 ?        00:00:00 polkitd
>   2110 ?        00:00:00 sh
>   2162 ?        00:00:00 ssh-agent
>   2165 ?        00:00:00 dbus-launch
>   2166 ?        00:00:00 dbus-daemon
>   2176 ?        00:00:00 xfce4-session
>   2178 ?        00:00:00 xfconfd
>   2182 ?        00:00:00 gpg-agent
>   2183 ?        00:00:02 xfwm4
>   2185 ?        00:00:03 xfce4-panel
>   2187 ?        00:00:00 xfsettingsd
>   2189 ?        00:00:00 syndaemon
>   2191 ?        00:00:00 xfdesktop
>   2195 ?        00:00:00 xfce4-power-man
>   2199 ?        00:00:01 xscreensaver
>   2202 ?        00:00:00 xfce4-power-man
>   2203 ?        00:00:00 xfce4-volumed
>   2208 ?        00:00:00 upowerd
>   2210 ?        00:00:00 panel-6-systray
>   2213 ?        00:00:00 panel-2-actions
>   2264 ?        00:00:45 netman
>   2271 ?        00:00:00 backend <defunct>
>   2272 ?        00:00:00 cat <defunct>
>   2280 ?        00:00:00 ifup <defunct>
>   2416 ?        00:00:00 at-spi-bus-laun
>   2743 ?        00:00:00 kworker/1:1
>   3809 ?        00:00:00 kworker/0:1
>   4106 ?        00:00:00 kworker/u8:0
>   4595 ?        00:00:00 kworker/1:0
>   4834 ?        00:00:00 kworker/u8:2
>   5130 ?        00:00:00 kworker/0:2
>   5207 ?        00:00:00 kworker/1:2
>   5732 ?        00:00:00 xfce4-terminal
>   5736 ?        00:00:00 gnome-pty-helpe
>   5737 pts/0    00:00:00 bash
>   5755 ?        00:00:00 ps <defunct>
>   5756 pts/0    00:00:00 ps
>   7389 ?        00:00:00 ifdown <defunct>
> 16124 ?        00:00:00 ifup <defunct>
> 16135 ?        00:00:00 wpa_supplicant
> 16189 ?        00:00:00 dhclient
> 18393 ?        00:00:28 medit
> 26622 ?        00:00:00 backend <defunct>
> 26853 ?        00:00:00 backend <defunct>
> 26886 ?        00:00:00 backend <defunct>
> 26908 ?        00:00:00 backend <defunct>
> 31536 ?        00:08:11 iceweasel

>
>
> I found this suggestion to get rid of zombies. The link is this:
> https://www.daniweb.com/software-development/cpp/threads/364407/handling-sigchld-to-prevent-zombie-processes
>
> What do you suggest?
>
>
> Edward.
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