Hard(?) lock when reassociating ath with wpa_supplicant on RELENG_7

[Sam Leffler]

Alexandre "Sunny" Kovalenko wrote:
> On Sun, 2008-07-13 at 11:21 +0200, Martin wrote:
>> Hi Sam,
>>
>> do you know if there is anything done about cbb(4)? I have many
>> wireless adapters with ath(4), but only the one based on PCMCIA is
>> making problems on FreeBSD.
>>
>> I cannot boot my notebook with the device inserted into the port, or it
>> will render the system unusable (100% load on cbb(4)).
>>
>> And all I can see is the following:
>> Jul 12 14:58:39 link kernel: ath0: ath_chan_set: unable to reset channel 1 (2412 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:58:40 link kernel: ath0: ath_chan_set: unable to reset channel 6 (2437 Mhz, flags 0x480 hal flags 0xc0), hal status 3233070656
>> Jul 12 14:58:41 link kernel: ath0: ath_chan_set: unable to reset channel 7 (2442 Mhz, flags 0x480 hal flags 0xc0), hal status 3233070656
>> Jul 12 14:58:42 link kernel: ath0: ath_chan_set: unable to reset channel 2 (2417 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:58:43 link kernel: ath0: ath_chan_set: unable to reset channel 3 (2422 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:58:44 link kernel: ath0: ath_chan_set: unable to reset channel 4 (2427 Mhz, flags 0x480 hal flags 0xc0), hal status 3233070656
>> Jul 12 14:58:45 link kernel: ath0: ath_chan_set: unable to reset channel 5 (2432 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:58:45 link kernel: ath0: ath_chan_set: unable to reset channel 8 (2447 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:58:46 link kernel: ath0: ath_chan_set: unable to reset channel 9 (2452 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:58:47 link kernel: ath0: ath_chan_set: unable to reset channel 10 (2457 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:58:52 link kernel: ath0: device timeout
>> Jul 12 14:58:52 link kernel: ath0: ath_reset: unable to reset hardware; hal status 3231908395
>> Jul 12 14:58:58 link kernel: ath0: ath_chan_set: unable to reset channel 1 (2412 Mhz, flags 0x480 hal flags 0xc0), hal status 3233070656
>> Jul 12 14:58:59 link kernel: ath0: ath_chan_set: unable to reset channel 6 (2437 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:00 link kernel: ath0: ath_chan_set: unable to reset channel 7 (2442 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:01 link kernel: ath0: ath_chan_set: unable to reset channel 2 (2417 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:01 link kernel: ath0: ath_chan_set: unable to reset channel 3 (2422 Mhz, flags 0x480 hal flags 0xc0), hal status 3289233408
>> Jul 12 14:59:02 link kernel: ath0: ath_chan_set: unable to reset channel 4 (2427 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:03 link kernel: ath0: ath_chan_set: unable to reset channel 5 (2432 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:04 link kernel: ath0: ath_chan_set: unable to reset channel 8 (2447 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:05 link kernel: ath0: ath_chan_set: unable to reset channel 9 (2452 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:06 link kernel: ath0: ath_chan_set: unable to reset channel 10 (2457 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:10 link kernel: ath0: device timeout
>> Jul 12 14:59:10 link kernel: ath0: ath_reset: unable to reset hardware; hal status 3231908395
>> Jul 12 14:59:11 link kernel: ath0: ath_chan_set: unable to reset channel 1 (2412 Mhz, flags 0x480 hal flags 0xc0), hal status 3233070656
>> Jul 12 14:59:12 link kernel: ath0: ath_chan_set: unable to reset channel 6 (2437 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:13 link kernel: ath0: ath_chan_set: unable to reset channel 7 (2442 Mhz, flags 0x480 hal flags 0xc0), hal status 3233070656
>> Jul 12 14:59:14 link kernel: ath0: ath_chan_set: unable to reset channel 2 (2417 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:15 link kernel: ath0: ath_chan_set: unable to reset channel 3 (2422 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:16 link kernel: ath0: unable to reset hardware; hal status 3868687084
>> Jul 12 14:59:16 link kernel: ath0: ath_chan_set: unable to reset channel 4 (2427 Mhz, flags 0x480 hal flags 0xc0), hal status 0
>> Jul 12 14:59:17 link kernel: ath0: ath_chan_set: unable to reset channel 11 (2462 Mhz, flags 0x480 hal flags 0xc0), hal status 3828804624
>> Jul 12 14:59:22 link kernel: ath0: unable to reset hardware; hal status 3868539700
>> Jul 12 14:59:32 link kernel: ath0: unable to reset hardware; hal status 3868539700
>> Jul 12 14:59:42 link kernel: ath0: unable to reset hardware; hal status 3868539700
>> Jul 12 15:00:22 link last message repeated 4 times
>> Jul 12 15:00:32 link kernel: ath0: unable to reset hardware; hal status 3868539700
>> Jul 12 15:00:42 link kernel: ath0: unable to reset hardware; hal status 3868539700
>> Jul 12 15:00:52 link kernel: ath0: unable to reset hardware; hal status 3868539700
>>
>>
>> wpa_supplicant is trying to access the card and switching channels, I
>> suppose.
>>
>> A workaround that I'm using all the time is:
>> 1) boot the notebook without the PCMCIA card
>> 2) after gdm appears, insert the card
>>
>> Also see:
>> http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/120376
>>
>> In this PR I also described that you can panic the system,
>> while trying to fix the situation by reinserting the card.
>> But I found out, that you can always panic the system when
>> ejecting the card and wpa_supplicant is running.
>>
> You can panic the box by unloading if_ath.ko while wpa_supplicant is
> running on any form factor, so this one is not specific to the removable
> devices.
> 

The wpa_supplicant issue is due to the ioctl path racing against detach. 
  I have a hack for this.  The root cause is the ifnet code not handling 
ifdetach correctly.  It doesn't happen in HEAD because of a slightly 
more general hack.

	Sam