Re: [gentoo-user] Why is dhcpcd starting by itself?

[Alan McKinnon <alan.mckinnon@gmail.com>]

On Sun, 26 Feb 2012 15:19:54 +0100
Willie WY Wong <wongwwy@member.ams.org> wrote:

> On Sun, Feb 26, 2012 at 10:35:35AM +0100, Penguin Lover Willie WY
> Wong squawked:
> > Can someone help me figure out how to find the offending initscript
> > that is needlessly calling dhcpcd? 
> 
> Apparently the culprit is /etc/init.d/netmount
> I am not sure how it got into the default run level, since I don't use
> any network file systems on my netbook. 

I believe the problem is much deeper than that and while your
observations are valid, you don't have a root cause yet. You just have
a happy symptom that works with your specific configuration.

Here's what I've found after much up & down-grading and rebooting:

First, I've had netmount in the default runlevel for ages and it's
worked for ages even though it does nothing.
Second, openrc has been launching "dhcpcd -q" at boot time for ages and
this has never interfered with wicd which comes along later.

openrc-0.8.* always works with any kernel version
openrc-0.9* work with kernel-3.2.5

openrc-0.9* does not work with kernel-3.2.6, giving these errors:

Feb 26 17:16:53 khamul dhcpcd[2661]: wlan0: leased 172.20.0.41 for
43200 seconds 
Feb 26 17:16:53 khamul avahi-daemon[2479]: Joining mDNS multicast group
on interface wlan0.IPv4 with address 172.20.0.41. 
Feb 26 17:16:53 khamul avahi-daemon[2479]: New relevant interface
wlan0.IPv4 for mDNS. 
Feb 26 17:16:53 khamul avahi-daemon[2479]: Registering new address
record for 172.20.0.41 on wlan0.IPv4. 
Feb 26 17:16:54 khamul dhcpcd[2661]: eth0: sending IPv6 Router
Solicitation
Feb 26 17:16:54 khamul dhcpcd[2661]: eth0: sendmsg: Network is
unreachable 
Feb 26 17:16:55 khamul dhcpcd[4388]: sending commands to master dhcpcd
process 
Feb 26 17:16:55 khamul dhcpcd[2661]: control command: /sbin/dhcpcd -k
wlan0 
Feb 26 17:16:55 khamul dhcpcd[2661]: wlan0: releasing lease of
172.20.0.41 
Feb 26 17:16:55 khamul avahi-daemon[2479]: Withdrawing address record
for 172.20.0.41 on wlan0. 
Feb 26 17:16:55 khamul avahi-daemon[2479]: Leaving mDNS multicast group
on interface wlan0.IPv4 with address 172.20.0.41. 
Feb 26 17:16:55 khamul avahi-daemon[2479]: Interface wlan0.IPv4 no
longer relevant for mDNS. 
Feb 26 17:16:55 khamul dhcpcd[2661]: wlan0: open_udp_socket: Cannot
assign requested address 
Feb 26 17:16:55 khamul kernel: [   58.240866] wlan0: deauthenticating
from 00:04:ed:45:65:df by local choice (reason=3)

That looks to me like avahi is all confused and tripping over what
openrc & wicd do properly. I'd say the root cause is a change in
kernel-3.2.6 that was not tested against.

So, what's the next debugging step?


-- 
Alan McKinnnon
alan.mckinnon@gmail.com