Hi everybody,

I've been using cerowrt as a secondary wifi network (just a single AP for now) for a few weeks now. Recently, my wndr3800 got stuck in a bad state and eventually rebooted. I've had this happen a few times now and am looking for ways to debug the issue. I'm new to cerowrt and openwrt so any advice is appreciated.

Since I use it as a secondary network, this is no way critical. I'm not looking for free tech support but I couldn't find anything on the wiki about troubleshooting. I'd love to start a page and write some shell scripts to diagnose and report issues. I know that a cerowrt router is meant to be a research project rather a consumer device but these things seem helpful regardless.

Please let me know if you'd prefer I not email the list with these issues or if you'd rather I used trac or a different forum.


--

In this state, I can connect to the cerowrt base station via wifi but am unable to route packets to the internet. I can connect to :81 and see the login page but logging in results in a lua error at `/cgi-bin/luci`


  /usr/lib/lua/luci/dispatcher.lua:448: Failed to execute function dispatcher target for entry '/'.
  The called action terminated with an exception:
  /usr/lib/lua/luci/sauth.lua:87: Session data invalid!
  stack traceback:
  [C]: in function 'assert'
  /usr/lib/lua/luci/dispatcher.lua:448: in function 'dispatch'
  /usr/lib/lua/luci/dispatcher.lua:195: in function </usr/lib/lua/luci/dispatcher.lua:194>

I can ssh into the device and cat various log files until the router hangs and reboots. here's a few relevant lines from my terminal history before the device rebooted (I'm assuming a watchdog kicked in and rebooted it).

root@buffy2-1:~# ping google.com
ping: bad address 'google.com'
root@buffy2-1:~# free
             total         used         free       shared      buffers
Mem:        126336       110332        16004            0         5616
-/+ buffers:             104716        21620
Swap:            0            0            0
root@buffy2-1:~# uptime
 02:08:54 up 2 days,  1:26,  load average: 0.10, 0.21, 0.17
root@buffy2-1:~# dmesg
[    0.000000] Linux version 3.10.24 (cero2@snapon) (gcc version 4.6.4 (OpenWrt/Linaro GCC 4.6-2013.05 r38226) ) #1 Tue Dec 24
10:50:15 PST 2013
[skipping some lines]

[   13.156250] Error: Driver 'gpio-keys-polled' is already registered, aborting...
[   19.414062] IPv6: ADDRCONF(NETDEV_UP): ge00: link is not ready
[   19.421875] ar71xx: pll_reg 0xb8050010: 0x11110000
[   19.429687] se00: link up (1000Mbps/Full duplex)
[   22.140625] IPv6: ADDRCONF(NETDEV_UP): sw00: link is not ready
[   23.351562] IPv6: ADDRCONF(NETDEV_CHANGE): sw00: link becomes ready
[   23.757812] ar71xx: pll_reg 0xb8050014: 0x11110000
[   23.757812] ge00: link up (1000Mbps/Full duplex)
[   23.773437] IPv6: ADDRCONF(NETDEV_CHANGE): ge00: link becomes ready

root@buffy2-1:~# ifconfig
ge00      Link encap:Ethernet  HWaddr 2C:B0:5D:A0:C5:B1  
          inet addr:192.168.1.138  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::2eb0:5dff:fea0:c5b1/64 Scope:Link
          inet6 addr: 2602:30a:2cdb:330:2eb0:5dff:fea0:c5b1/64 Scope:Global
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1469670 errors:0 dropped:8 overruns:0 frame:0
          TX packets:547733 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:229243410 (218.6 MiB)  TX bytes:57304808 (54.6 MiB)
          Interrupt:5

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:23689 errors:0 dropped:0 overruns:0 frame:0
          TX packets:23689 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2612713 (2.4 MiB)  TX bytes:2612713 (2.4 MiB)

pimreg    Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          UP RUNNING NOARP  MTU:1472  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

se00      Link encap:Ethernet  HWaddr 2E:B0:5D:A0:C5:B0  
          inet addr:172.30.42.1  Bcast:172.30.42.31  Mask:255.255.255.224
          inet6 addr: 2602:30a:2cdb:330:2eb0:5dff:fea0:c5b1/64 Scope:Global
          inet6 addr: fe80::2cb0:5dff:fea0:c5b0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:191740 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:42184988 (40.2 MiB)
          Interrupt:4

sw00      Link encap:Ethernet  HWaddr 2C:B0:5D:A0:C5:B0  
          inet addr:172.30.42.65  Bcast:172.30.42.95  Mask:255.255.255.224
          inet6 addr: 2602:30a:2cdb:330:2eb0:5dff:fea0:c5b1/64 Scope:Global
          inet6 addr: fe80::2eb0:5dff:fea0:c5b0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:70239 errors:0 dropped:0 overruns:0 frame:0
          TX packets:286967 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:15590189 (14.8 MiB)  TX bytes:127357293 (121.4 MiB)

root@buffy2-1:~# less /var/log/babeld.log
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
send: Cannot assign requested address
send: Cannot assign requested address
send: Cannot assign requested address
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
netlink_read: recvmsg(): No buffer space available
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
Couldn't determine channel of interface sw00: Invalid argument.
</quote>

and then the system hang. Note: the first time I ran 'less
/var/log/babeld.log', it was Killed. I would assume that's an OOM
killer?

I'm running cerowrt 3.10.24-8 on a wndr3800. I have a spare wndr3800
that I'm getting ready to flash with the same version and I can see if I get
the same issue. What's the best way to clone a configuration?

---

Here are some log lines from a separate instance of the same problem, I
recovered these log lines from the web server (I was able to login to
the web interface for another hour until I got the same lua exception
as in the beginning of this email)

This time I was completely unable to connect to wifi from my iPhone
and you can see where hostapd disassociates the iPhone soon after
it connects.

the kernel log:

[158995.550781] icmp6_send: no reply to icmp error

[160930.527343] ath: phy0: Failed to stop TX DMA, queues=0x004!

[160930.542968] ath: phy0: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020 DMADBG_7=0x000084c0

[160930.554687] ath: phy0: Could not stop RX, we could be confusing the DMA engine when we start RX up

and in the system log:

Fri Jan 24 15:51:15 2014 daemon.err minissdpd[4933]: recvmsg(s, &hdr, 0): No buffer space available

Fri Jan 24 15:51:15 2014 daemon.err avahi-daemon[1273]: netlink.c: recvmsg() failed: No buffer space available

Fri Jan 24 15:52:18 2014 daemon.err minissdpd[4933]: recvmsg(s, &hdr, 0): No buffer space available


root@buffy2-1:/tmp/log# free

             total         used         free       shared      buffers

Mem:        126336       110128        16208            0         5616

-/+ buffers:             104512        21824

Swap:            0            0            0


Fri Jan 24 17:14:53 2014 daemon.err minissdpd[4933]: recvmsg(s, &hdr, 0): No buffer space available

Fri Jan 24 17:15:53 2014 daemon.err minissdpd[4933]: recvmsg(s, &hdr, 0): No buffer space available

Fri Jan 24 17:16:18 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 IEEE 802.11: authenticated

Fri Jan 24 17:16:18 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 IEEE 802.11: associated (aid 1)

Fri Jan 24 17:16:18 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 RADIUS: starting accounting session 52DC70A7-00000010

Fri Jan 24 17:16:18 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 WPA: pairwise key handshake completed (RSN)

Fri Jan 24 17:16:18 2014 daemon.info dnsmasq-dhcp[4999]: DHCPREQUEST(sw00) 192.168.1.114 90:72:40:e9:9c:b6

Fri Jan 24 17:16:18 2014 daemon.info dnsmasq-dhcp[4999]: DHCPNAK(sw00) 192.168.1.114 90:72:40:e9:9c:b6 wrong network

Fri Jan 24 17:16:21 2014 daemon.info dnsmasq-dhcp[4999]: DHCPDISCOVER(sw00) 90:72:40:e9:9c:b6

Fri Jan 24 17:16:21 2014 daemon.info dnsmasq-dhcp[4999]: DHCPOFFER(sw00) 172.30.42.82 90:72:40:e9:9c:b6

Fri Jan 24 17:16:21 2014 daemon.info dnsmasq-dhcp[4999]: DHCPDISCOVER(sw00) 90:72:40:e9:9c:b6

Fri Jan 24 17:16:21 2014 daemon.info dnsmasq-dhcp[4999]: DHCPOFFER(sw00) 172.30.42.82 90:72:40:e9:9c:b6

Fri Jan 24 17:16:22 2014 daemon.info dnsmasq-dhcp[4999]: DHCPREQUEST(sw00) 172.30.42.82 90:72:40:e9:9c:b6

Fri Jan 24 17:16:22 2014 daemon.info dnsmasq-dhcp[4999]: DHCPACK(sw00) 172.30.42.82 90:72:40:e9:9c:b6 stevejs-iPhone

Fri Jan 24 17:16:35 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 IEEE 802.11: disassociated

Fri Jan 24 17:16:36 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 IEEE 802.11: deauthenticated due to inactivity (timer DEAUTH/REMOVE)

Fri Jan 24 17:16:57 2014 daemon.err minissdpd[4933]: recvmsg(s, &hdr, 0): No buffer space available

Fri Jan 24 17:17:59 2014 daemon.err minissdpd[4933]: recvmsg(s, &hdr, 0): No buffer space available

Fri Jan 24 17:19:04 2014 daemon.err minissdpd[4933]: recvmsg(s, &hdr, 0): No buffer space available

Fri Jan 24 17:19:04 2014 daemon.err avahi-daemon[1273]: netlink.c: recvmsg() failed: No buffer space available

Fri Jan 24 17:19:45 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 IEEE 802.11: authenticated

Fri Jan 24 17:19:45 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 IEEE 802.11: associated (aid 1)

Fri Jan 24 17:19:45 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 RADIUS: starting accounting session 52DC70A7-00000011

Fri Jan 24 17:19:45 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 WPA: pairwise key handshake completed (RSN)

Fri Jan 24 17:19:45 2014 daemon.info dnsmasq-dhcp[4999]: DHCPDISCOVER(sw00) 90:72:40:e9:9c:b6

Fri Jan 24 17:19:45 2014 daemon.info dnsmasq-dhcp[4999]: DHCPOFFER(sw00) 172.30.42.82 90:72:40:e9:9c:b6

Fri Jan 24 17:19:47 2014 daemon.info dnsmasq-dhcp[4999]: DHCPREQUEST(sw00) 172.30.42.82 90:72:40:e9:9c:b6

Fri Jan 24 17:19:47 2014 daemon.info dnsmasq-dhcp[4999]: DHCPACK(sw00) 172.30.42.82 90:72:40:e9:9c:b6 stevejs-iPhone

Fri Jan 24 17:20:01 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 IEEE 802.11: disassociated

Fri Jan 24 17:20:02 2014 daemon.info hostapd: sw00: STA 90:72:40:e9:9c:b6 IEEE 802.11: deauthenticated due to inactivity (timer DEAUTH/REMOVE)

Fri Jan 24 17:20:09 2014 daemon.err minissdpd[4933]: recvmsg(s, &hdr, 0): No buffer space available

Fri Jan 24 17:21:10 2014 daemon.err minissdpd[4933]: recvmsg(s, &hdr, 0): No buffer space available

and then it hung and rebooted.

I bought this particular wndr3800 used so it's possible I have a bad piece of hardware. Are there any hardware testing scripts or anything like memtest86 for these devices?  Are there entries in /sys that I should be looking at? I've noticed about 9k unaligned_instructions on boot but that never grows.

Thanks!
Steve Jenson
@stevej