DHCP Server Fails When Forking

[Jay Foster]

Can you be more specific?  /usr/sbin/dhcpd is root:root. /usr/sbin/dhcpd 
is being run as root.

On 1/6/2020 12:58 PM, Christopher Barry wrote:
> Make sure user/group perms are valid.
>
>
> On Mon, Jan 6, 2020, 1:42 PM Jay Foster <jay at systech.com 
> <mailto: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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