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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> Dng mailing list
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Re: [DNG] BUG: zombies increase whi…
