Dhcpcd consumes a lot of CPU when wireless switch is off

If I turn my hardware wireless switch off, dhcpcd goes crazy and uses a CPU core completely. Checking with htop, the command being run is:
dhcpcd -4qL -t 30 wlp13s0
where wlp13s0 is my wireless interface. I'm using netctl-auto to connect to the network.
It goes back to normal as soon as I turn the switch back on.
The network configuration under /etc/netctl to which it was connected before I turned the switch off is
Description='Automatically generated profile by wifi-menu'
Interface=wlp13s0
Connection=wireless
Security=wpa
ESSID="network"
IP=dhcp
Key="password"
Is there anything I can do so that dhcpcd won't try to use all my CPU in such cases?
EDIT (2014.05.28):
I looked in the following wiki pages, but couldn't find anything about this issue:
https://wiki.archlinux.org/index.php/Br … leshooting
https://wiki.archlinux.org/index.php/Dhcpcd
https://wiki.archlinux.org/index.php/Ne … figuration
https://wiki.archlinux.org/index.php/Netctl
I couldn't find anything about dhcpcd and cpu usage in the forums, and searching the web didn't provide any relevant results. Which is bad, since anatolik found this:
https://bugs.archlinux.org/task/39512
which I didn't.
Last edited by mgmillani (2014-05-28 11:07:02)

ondoho wrote:Have you tried connecting to the network manually, then pressing the switch?
If I turn the switch on after turning it off, I must connect manually using netctl (that is, netctl-auto doesn't connect automatically in this case). After doing that, turning the switch back off does not cause the problem. Which is weird, since the process is still there, like before
I also noticed that it is no longer possible to use netctl-auto after turning the switch off, as it no longer see any configuration (running `netctl-auto list` as root returns nothing, while before it returned 2 items).
ondoho wrote:how did you install and activate wireless
I basically followed this wiki page:
https://wiki.archlinux.org/index.php/Ne … f_profiles
I first generated the profiles with wifi-menu and by copying /etc/netctl/examples/ethernet-dhcp, and then activated netctl-auto using
# systemctl enable [email protected]
# systemctl enable [email protected]
ondoho wrote:wht is your (wireless) hardware
My wireless hardware (according to lspci) is:
0d:00.0 Network controller: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter (rev 01)
ondoho wrote:once you know these things, search the wiki, the forums, the web.
[ in case you have done this already please include it in your first post, otherwise we must assume you didn't. ]
Included in the first post now.
anatolik wrote:I suspect you see this bug https://bugs.archlinux.org/task/39512
Yes, it looks very similar. It is said there that the problem should be fixed since 2014-04-01 11:48:57, but I just checked for updates with pacman and I already have the most recent version (6.3.2). I will see if I can add any relevant information to that page.
I did notice that my wireless interface disappears when I turn the switch off (ifconfig doesn't show it anymore), and it only reappears when I reconnect manually. I'm not sure if that is expected, since the commit that should have solved the problem says:
On a read error, remove the FD from eloop. This shouldn't happen really

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