DHCP Server Fails When Forking

Christopher Barry christopher.r.barry at gmail.com
Mon Jan 6 20:58:32 UTC 2020


Make sure user/group perms are valid.


On Mon, Jan 6, 2020, 1:42 PM Jay Foster <jay at systech.com> wrote:

> I am using the ISC DHCP server (dhcpd) version 4.3.6 from a rocko Yocto
> build.  When dhcpd is started without the '-f' or '-d' options (forks to
> the background) it does not work.  DHCP DISCOVER requests are sent, but
> the dhcpd application does not respond.  I can attach strace to the
> dhcpd process and see that dhcpd just sleeps in an futex() call.
>
> If I start dhcpd with either the '-f' or '-d' options so it does not
> fork, then it works properly.
>
> I have run dhcpd (both forking and non forking) using strace to see if I
> could spot any differences.  The only thing I notice is that when
> forking, the parent process terminates (expected) along with 3 other
> child processes/threads.  It looks like these other threads are supposed
> to handle the ISC tasks/messages, but are not cloned by the fork and are
> not present after forking.
>
> For reference, with an older version of ISC DHCP server (4.1.1-P1) on an
> older product, this problem does not occur.
>
> Any ideas where to look?
>
>
>
>
>
> _______________________________________________
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> dhcp-users at lists.isc.org
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>
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