Problem with Atheros adapter (TP-LINK TL-WDN4800, AR9380)

[Adrian Chadd]

Hi!

Hm, an integer divide by zero fault. Tsk.

can you do this:

kgdb /boot/kernel/kernel
list *0xffffffff8045161d

Thanks!



-adrian


On 14 December 2014 at 11:24, David Blewett <david at dawninglight.net> wrote:
> Hi All:
>
> I've been having issues with a TP-LINK TL-WDN4800 PCI Express adapter [1]
> that seem to have become worse since upgrading to 10.1-RELEASE. Since then,
> I've had a couple of kernel panics. I use the adapter in hostapd mode as my
> main WiFi access point. I would appreciate any help in making my setup more
> reliable, and am open to trying to just about anything to help
> troubleshoot.
>
> The problems that I see are regular disconnections from a Macbook Pro
> client. When this happens, sometimes the wifi icon says it is connected,
> but I cannot actually transmit anything to the host (i.e., pings fail). The
> only recourse is to turn the mbp's wifi off, then back on. This *usually*
> succeeds, but sometimes does not. I also have an iPad that has similar
> issues; turning wifi off and back on is usually sufficient to restore
> connectivity.
>
> This is my /etc/rc.conf:
>
> wlans_ath0="wlan0"
> create_args_wlan0="wlanmode hostap bssid"
> ifconfig_wlan0="HOSTAP ssid MiddleEarth mode 11ng channel 2"
>
> and /etc/hostapd-wlan0.conf:
>
> interface=wlan0
> debug=2
> ctrl_interface=/var/run/hostapd
> ctrl_interface_group=wheel
> ssid=MiddleEarth
> wpa=2
> wpa_passphrase=xxxx
> wpa_key_mgmt=WPA-PSK
> wpa_pairwise=CCMP
>
> I see a lot of this in the logs:
>
> ath0: stuck beacon; resetting (bmiss count 8)
>
> However, from what I've read these are due to channel congestion and are to
> be expected. The kernel panics look like this:
>
> Fatal trap 18: integer divide fault while in kernel mode
> cpuid = 1; apic id = 11
> instruction pointer = 0x20:0xffffffff8045161d
> stack pointer           = 0x28:0xfffffe00e43bb760
> frame pointer           = 0x28:0xfffffe00e43bb7b0
> code segment        = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags    = interrupt enabled, ath0: stuck beacon; resetting
> (bmiss count 8)
> resume, IOPL = 0
> current process     = 12 (swi4: clock)
> trap number     = 18
> panic: integer divide fault
> cpuid = 0
> KDB: stack backtrace:
> #0 0xffffffff80963000 at kdb_backtrace+0x60
> #1 0xffffffff80928125 at panic+0x155
> #2 0xffffffff80d24f1f at trap_fatal+0x38f
> #3 0xffffffff80d24b7c at trap+0x75c
> #4 0xffffffff80d0a782 at calltrap+0x8
> #5 0xffffffff8045b248 at ar9300_ani_poll_freebsd+0x48
> #6 0xffffffff804093d6 at ath_calibrate+0xf6
> #7 0xffffffff8093d557 at softclock_call_cc+0x177
> #8 0xffffffff8093d994 at softclock+0x94
> #9 0xffffffff808faf4b at intr_event_execute_handlers+0xab
> #10 0xffffffff808fb396 at ithread_loop+0x96
> #11 0xffffffff808f8b6a at fork_exit+0x9a
>
> Here is the pciconf output:
>
> ath0 at pci0:2:0:0:    class=0x028000 card=0x3112168c chip=0x0030168c rev=0x01
> hdr=0x00
>     vendor     = 'Atheros Communications Inc.'
>     device     = 'AR9300 Wireless LAN adaptor'
>     class      = network
>
> 1. http://www.tp-link.com/lk/products/details/?model=TL-WDN4800
>
> Thanks,
>
> David Blewett
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