[Cerowrt-devel] cerowrt issues (3.10.24-8)
Dave Taht
dave.taht at gmail.com
Mon Jan 27 16:14:02 EST 2014
certainly turn off the babeld log! I will leave it off in the next release.
On Mon, Jan 27, 2014 at 4:10 PM, Steve Jenson <stevej at fruitless.org> wrote:
> Looking more, the buffer errors are showing up in syslog well before tmpfs
> fills up. Is the memtester openwrt package available for cerowrt? I don't
> see it under `Available packages`.
>
> Thanks,
> Steve
>
>
> On Mon, Jan 27, 2014 at 1:06 PM, Steve Jenson <stevej at fruitless.org> wrote:
>>
>> On Fri, Jan 24, 2014 at 3:23 PM, Dave Taht <dave.taht at gmail.com> wrote:
>>>
>>> On Fri, Jan 24, 2014 at 6:08 PM, Steve Jenson <stevej at fruitless.org>
>>> wrote:
>>> > 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.
>>>
>>> Yea! I appreciate caution before putting alpha software on your gw.
>>>
>>> > 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.
>>>
>>> Sure, let me know your wiki account. I have been lax about granting
>>> access of late as the signup process is overrun by spammers.
>>
>>
>> My username is stevej on the wiki. Thanks!
>>
>>
>>>
>>> > 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.
>>> >
>>>
>>> The list is where most stuff happens. Also in the irc channel.
>>>
>>> If it gets to where it needs to be tracked we have a bugtracker at
>>>
>>> http://www.bufferbloat.net/projects/cerowrt/issues
>>>
>>> The first question I have is: Are you on comcast? Cerowrt
>>> had a dhcpv6-pd implementation that "just worked" from feburary through
>>> december. Regrettably they changed the RA announcement interval
>>> to a really low number around then... and this triggers a firewall reload
>>> every minute on everything prior to the release I point to below.
>>>
>>> If there is a memory leak somewhere that would have triggered it.
>>
>>
>> I am on AT&T ADSL2+ with a Motorola NVG510 modem.
>>
>>
>>>
>>> > 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 at buffy2-1:~# ping google.com
>>> > ping: bad address 'google.com'
>>> > root at buffy2-1:~# free
>>> > total used free shared buffers
>>> > Mem: 126336 110332 16004 0 5616
>>> > -/+ buffers: 104716 21620
>>> > Swap: 0 0 0
>>> > root at buffy2-1:~# uptime
>>> > 02:08:54 up 2 days, 1:26, load average: 0.10, 0.21, 0.17
>>> > root at buffy2-1:~# dmesg
>>> > [ 0.000000] Linux version 3.10.24 (cero2 at 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 at 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
>>>
>>> How are you assigning your ipv6 addresses?
>>
>>
>> It's been a while since I messed with this but I think IPv6 is assigned
>> thanks to 6relayd? My modem has IPv6 enabled but no DHCPv6 options that I
>> can find. Here's how cerowrt is configured.
>>
>> root at buffy2-1:/overlay/etc/config# cat 6relayd
>> config server 'default'
>> option fallback_relay 'rd dhcpv6 ndp'
>> list network 'ge00'
>> list network 'ge01'
>> list network 'gw00'
>> list network 'gw01'
>> list network 'gw10'
>> list network 'gw11'
>> list network 'se00'
>> list network 'sw00'
>> list network 'sw10'
>> option rd 'relay'
>> option dhcpv6 'relay'
>> option ndp 'relay'
>> option master 'ge00'
>>
>>>
>>> > 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 at 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.
>>>
>>> This is a problem in babel detecting the channel on a "normal"
>>> rather than a mesh interface. It's bugged me a long while, but
>>> haven't got around to finding what triggers it. Might "fix" it by
>>> acquiring the channel at babel start time from /etc/config/wireless.
>>>
>>> It messes up the diversity routing calculation, grump.
>>>
>>> There is a possibility a logfile got really big, but this one
>>> generally doesn't, but I should turn off logging in some
>>> future release...
>>
>>
>> I believe I've tracked down part of what's going on. It looks like my
>> tmpfs is filling up 100% and then the device enters a bad state:
>>
>> After 24 hours, with tmpfs at 50%, babeld.log is the largest file by far
>> in tmpfs and the only file that appears to be growing (based on `du`). It
>> takes about 48 hours from reboot to fill up tmpfs on my device.
>>
>> # sort babeld.log | uniq -c |sort -rn |head
>>
>> 503236 Couldn't determine channel of interface sw00: Invalid argument.
>>
>> 1376 netlink_read: recvmsg(): No buffer space available
>>
>> 3 send: Cannot assign requested address
>>
>> # wc -l babeld.log
>>
>> 504617 babeld.log
>>
>> I sped up system failure by using `dd` to fill up tmpfs and the system
>> became immediately unusable.
>>
>> This also explains the luci session store errors as sessions are stored in
>> tmpfs.
>>
>> The other buffer issues may or may not be related to this.
>>
>> Best,
>> Steve
>
>
--
Dave Täht
Fixing bufferbloat with cerowrt: http://www.teklibre.com/cerowrt/subscribe.html
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