Re: -current network buffer exhaustion on RPi2 armv7

On Mon, Feb 16, 2026 at 03:55:56PM -0800, Adrian Chadd wrote:
> On Mon, 16 Feb 2026 at 15:30, bob prohaska <[email protected]> wrote:
> >
> > Oops, I'm mistaken. The network connection turned out to be down.
> > However, the system didn't seem to know it. ifconfig reported:
> > lan0: flags=8c43<UP,BROADCAST,RUNNING,DRV_OACTIVE,SIMPLEX,MULTICAST> metric 0 mtu 1500
> >         options=0
> >         ether 00:0f:60:05:37:4f
> >         inet 192.168.1.10 netmask 0xffffff00 broadcast 192.168.1.255
> >         inet6 fe80::20f:60ff:fe05:374f%wlan0 prefixlen 64 scopeid 0x3
> >         groups: wlan
> >         ssid "" channel 2 (2417 MHz 11g)
> >         regdomain ETSI2 country US authmode WPA1+WPA2/802.11i privacy ON
> >         deftxkey UNDEF txpower 30 bmiss 7 scanvalid 60 protmode CTS wme
> >         roaming MANUAL
> >         parent interface: run0
> >         media: IEEE 802.11 Wireless Ethernet DS/1Mbps mode 11g (autoselect)
> >         status: no carrier
> >         nd6 options=23<PERFORMNUD,ACCEPT_RTADV,AUTO_LINKLOCAL>
> 
> > but ping reported network is down. Running ifconfig wlan0 up provoked
> > no response and no change in behavior. Running ifconfig wlan0 down
> > reports dhclient exiting, followed by
> > ifconfig wlan0 up seems to restore connectivity, at least for a while.
> >
> > Is the system losing its connectivity and not noticing? Or maybe
> > noticing but getting stuck in a loop trying to recover? The
> > status: no carrier
> > seems to indicate a problem.
> 
> Yup, it looks like for some reason it's hung; wpa_supplicant should be
> kicking off a scan and well,
> the above is telling me that it is stuck.
> 
> Try running "wpa_cli" to see what decisions its making. it logs them
> to the wpa_cli tool whilst its running.
> You may first need to put this in /etc/wpa_supplicant.conf :
> 
> ctrl_interface=/var/run/wpa_supplicant
> 

Something's amiss. Right now /etc/wpa_supplicant.conf contains:
        
	ctrl_interface=/var/run/wpa_supplicant
network={
        ssid="d-link.zefox.net" 
        psk="redacted" 
}

but I get

root@generic:/usr/src # wpa_cli reconfigure
Failed to connect to non-global ctrl_ifname: (nil)  error: Inappropriate ioctl for device

Likely the problem is the formatting in wpa_supplicant.conf, but 
the error isn't obvious to me. I did try putting the ctrl_interface
line inside the curly braces, still got a "can't connect" message.

I'll recheck the man pages, but if you recognize my mistake
please point it out.

Thanks for writing!

bob prohaska