dhcpclient and dhcpd do not stop on sigterm

[prashantkumar dhotre]

Thanks
I did not understand.
Is this a bug ?
Is this issue fixed in latest release?
Is there any work around in my version


On Mon, Mar 26, 2018, 5:35 PM Pavel Zhukov <pzhukov at redhat.com> wrote:

> Hello,
> This change may be relevant:
>
> https://github.com/mirroring/dhcp/commit/0985d149c60754feb41b34221f292de60d1ee80b
>
> prashantkumar dhotre <prashantkumardhotre at gmail.com> writes:
>
> > Hi experts
> >
> > I am using dhcpclient and dhcpd 4.3.4
> >
> > I am testing reboot time in my system.
> > I do not have much knowledge about dhcpclient and dhcpd apps.
> >
> > I see that dhcpclient and dhcpd do not stop on sigterm signal.
> >
> > when systemd starts system shutdown, it send sigterm to all apps
> including dhcpclient and dhcpd.i see that these two apps do not stop.
> >
> > after 90 sec systemd sends sigkill and then these apps gets killed.
> >
> > Is this a bug in 4.3.4 version ?
> >
> > is this fixed in latest version ?
> >
> > if not, what is the work-around for this issue ?
> >
> > strace and systemd service files are below
> >
> > Thanks for you help
> >
> > Regards
> >
> > strace:
> >
> > root at re:~# /usr/bin/strace -ttT -s 100 -ff -p `pidof dhclient`
> >
> > /usr/bin/strace: Process 21228 attached
> >
> > 02:29:42.167613 futex(0x7ff92089c0cc, FUTEX_WAIT_PRIVATE, 0, NULL) = ?
> ERESTARTSYS (To be restarted if SA_RESTART is set) <20.048539>
> >
> > 02:30:02.216314 --- SIGCONT {si_signo=SIGCONT, si_code=SI_USER,
> si_pid=1, si_uid=0} ---
> >
> > 02:30:02.216460 futex(0x7ff92089c0cc, FUTEX_WAIT_PRIVATE, 0, NULL
> <unfinished ...>
> >
> > 02:31:32.310754 +++ killed by SIGKILL +++
> >
> > root at re:~#
> >
> >
> >
> > ++++
> >
> > root at evo-ptx-h-re1:~# /usr/bin/strace -ttT -s 100 -ff -p `pidof dhcpd`
> >
> > /usr/bin/strace: Process 22040 attached with 4 threads
> >
> > [pid 22046] 02:52:57.774430 futex(0x7f54707a40a0, FUTEX_WAIT_PRIVATE, 0,
> NULL <unfinished ...>
> >
> > [pid 22045] 02:52:57.774547 epoll_wait(5,  <unfinished ...>
> >
> > [pid 22044] 02:52:57.774560 futex(0x7f54707a10c8, FUTEX_WAIT_PRIVATE, 0,
> NULL <unfinished ...>
> >
> > [pid 22040] 02:52:57.774570 futex(0x7f54707a00e0, FUTEX_WAIT_PRIVATE, 0,
> NULL <unfinished ...>
> >
> > [pid 22046] 02:53:03.351769 <... futex resumed> ) = ? ERESTARTSYS (To be
> restarted if SA_RESTART is set) <5.577214>
> >
> > [pid 22045] 02:53:03.351792 <... epoll_wait resumed> 0x7f54707a3010, 64,
> -1) = -1 EINTR (Interrupted system call) <5.577239>
> >
> > [pid 22044] 02:53:03.351952 <... futex resumed> ) = ? ERESTARTSYS (To be
> restarted if SA_RESTART is set) <5.577387>
> >
> > [pid 22046] 02:53:03.351972 --- SIGCONT {si_signo=SIGCONT,
> si_code=SI_USER, si_pid=1, si_uid=0} ---
> >
> > [pid 22040] 02:53:03.351992 <... futex resumed> ) = ? ERESTARTSYS (To be
> restarted if SA_RESTART is set) <5.577417>
> >
> > [pid 22046] 02:53:03.352001 futex(0x7f54707a40a0, FUTEX_WAIT_PRIVATE, 0,
> NULL <unfinished ...>
> >
> > [pid 22045] 02:53:03.352016 epoll_wait(5,  <unfinished ...>
> >
> > [pid 22040] 02:53:03.352049 futex(0x7f54707a00e0, FUTEX_WAIT_PRIVATE, 0,
> NULL <unfinished ...>
> >
> > [pid 22044] 02:53:03.352142 futex(0x7f54707a10c8, FUTEX_WAIT_PRIVATE, 0,
> NULL <unfinished ...>
> >
> > [pid 22046] 02:54:33.552465 +++ killed by SIGKILL +++
> >
> > [pid 22045] 02:54:33.552485 +++ killed by SIGKILL +++
> >
> > [pid 22044] 02:54:33.552494 +++ killed by SIGKILL +++
> >
> > 02:54:33.559654 +++ killed by SIGKILL +++
> >
> > root at evo-ptx-h-re1:~#
> >
> >
> >
> >
> >
> >
> >
> > systemd service files:
> >
> >
> >
> > root at evo-ptx-h-re1:~# cat   /lib/systemd/system/dhclient.service
> >
> > [Unit]
> >
> > Description=Dynamic Host Configuration Protocol (DHCP)
> >
> > RequiresOverridable=network at vmb.service
> >
> > Before=ypbind.service
> >
> > After=syslog.target network.target network at vmb.service
> >
> >
> >
> > [Service]
> >
> > Type=forking
> >
> > PIDFile=/var/run/dhclient.pid
> >
> > EnvironmentFile=-/etc/default/dhcp-client
> >
> > ExecStart=/sbin/dhclient -cf /etc/dhcp/dhclient.conf -q -lf
> /var/lib/dhcp/dhclient.leases $INTERFACES
> >
> > #ExecStart=/usr/bin/strace -ttT -s 100 -ff /sbin/dhclient -cf
> /etc/dhcp/dhclient.conf -q -lf /var/lib/dhcp/dhclient.leases $INTERFACES
> >
> > Restart=on-failure
> >
> > RestartSec=1
> >
> >
> >
> > [Install]
> >
> > WantedBy=multi-user.target network-online.target
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > root at evo-ptx-h-re1:~# cat   /lib/systemd/system/dhcpd.service
> >
> > [Unit]
> >
> > Description=DHCPv4 Server Daemon
> >
> > Documentation=man:dhcpd(8) man:dhcpd.conf(5)
> >
> > After=network.target
> >
> > After=time-sync.target
> >
> > Wants=network at vib.service
> >
> > After=network at vib.service
> >
> >
> >
> > [Service]
> >
> > PIDFile=/var/run/dhcpd.pid
> >
> > EnvironmentFile=/etc/default/dhcp-server
> >
> > EnvironmentFile=-/etc/sysconfig/dhcp-server
> >
> > ExecStartPre=/bin/touch /var/lib/dhcp/dhcpd.leases
> >
> > ExecStart=/usr/sbin/dhcpd -f -cf /etc/dhcp/dhcpd.conf -pf
> /var/run/dhcpd.pid $DHCPDARGS -q $INTERFACES
> >
> >
> >
> > [Install]
> >
> > WantedBy=multi-user.target
> >
> > root at evo-ptx-h-re1:~#
> >
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> > dhcp-users mailing list
> > dhcp-users at lists.isc.org
> > https://lists.isc.org/mailman/listinfo/dhcp-users
>
> --
> PAVEL ZHUKOV
> SOFTWARE ENGINEER, RHCE, RHCVA
> Red Hat
> pzhukov at redhat.com    IM: IRC: landgraf
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/dhcp-users/attachments/20180327/f776adc1/attachment.html>