Re: ath10k/QCA9980 - Issues introduced in wireless testing 2016-05

[Ben Greear <greearb@candelatech.com>]

On 06/10/2016 05:22 AM, Kalle Valo wrote:
> Felix Fietkau <nbd@nbd.name> writes:
>
>> On 2016-06-10 10:50, Michal Kazior wrote:
>>> On 9 June 2016 at 09:46, A. Benz <ash.benz@bk.ru> wrote:
>>>> Dear All,
>>>>
>>>> I am using LEDE on my IPQ806x (QCA9980) system (Archer C2600).
>>>> With compat-wireless-2016-05-12, I observed traces attached below.
>>>> The router is unstable and eventually reboots by itself (randomly).
>>>>
>>>> Upon reverting to compat-wireless-2016-01, the issue disappears. Nothing
>>>> else is changed (software-wise or hardware).
>>>> This was confirmed with other users.
>>>>
>>>> A new compile with the fixes below:
>>>> https://git.lede-project.org/?p=lede/nbd/staging.git;a=commit;h=858e26f3c0fc11231f25497cbb2ddca1e5f101e0
>>>>
>>>> Did not solve the problem.
>>>>
>>>> Please let me know if I need to provide any further information.
>>>>
>>>> ------------[ cut here ]------------
>>>> WARNING: CPU: 0 PID: 558 at
>>>> compat-wireless-2016-05-12/net/mac80211/rx.c:4068
>>>> ieee80211_rx_napi+0x8c/0x8a4 [mac80211]()
>>>
>>> Can you post what is at rx.c line 4068 (and +/- 3 lines), please?
>> It's early in ieee80211_rx_napi:
>>
>>      sband = local->hw.wiphy->bands[status->band];
>>      if (WARN_ON(!sband))
>>          goto drop;
>>
>> I could not easily find a scenario under which status->band would not be
>> set properly by the driver, so my guess is there is some nasty memory
>> corruption going on.
>>
>> FWIW, I've received several reports like this from different people on
>> different devices. They're also confirming that reverting to the
>> snapshot from January makes things stable again.
>
> Adding ath10k list to the loop.

This looks a lot like the problems I was having.

Two of these 5 patches recently made it upstream (but may not be in LEDE yet),
but the other patches also were related to memory corruption.

See my patches posted on 4/1/16:

https://patchwork.kernel.org/project/ath10k/list/

I don't know where the 5/5 patch ended up.

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com