system hang with backports-20150511/20150525

Marty Faltesek mfaltesek at
Mon Jun 1 12:42:49 PDT 2015

I disabled IEEE80211_HW_SUPPORT_FAST_XMIT before, and still saw the
hang. I repeated today to confirm.

I added the extra ath10k debug flags you requested, and it causes a
system reset without any messages, very soon after the last hbeat
timestamp. I've uploaded  log "crash." to

Any advice on how to bisect when using backports?

On Mon, Jun 1, 2015 at 4:27 AM, Michal Kazior <michal.kazior at> wrote:
> On 1 June 2015 at 09:13, Kalle Valo <kvalo at> wrote:
>> Michal Kazior <michal.kazior at> writes:
>>> +ath10k list
>>> On 1 June 2015 at 03:37, Marty Faltesek <mfaltesek at> wrote:
>>>> Starting with backports-20150511, and continuing with
>>>> backports-20150525, we see frequent system hangs. backports-20150424
>>>> had no issue.
>>> I don't see such binary releases on
>>> Hence I don't know what kernel you've backported the drivers from and
>>> I can't compare anything.
>>> Can you provide more details, please?
>> I suspect it's from here:
>> The backports project pages are a bit confusing and that location is
>> hard to find.
> Oh, thanks!
> Hmm.. There was a ton of changes between 20150424 and 20150511. For
> one, ath10k started to use chanctx API and FAST_XMIT. But it's not a
> given these two are to blame.
> The latter can be easily disabled by removing
> IEEE80211_HW_SUPPORT_FAST_XMIT from ar->hw->flags in ath10k's mac.c.
> The former.. not so easy. I'd be awesome if you could do a git bisect.
> The commit ids are a3da0fb6(good) f17107c(bad) (you need linux-next
> git repo including its tags for these ids to be resolvable).
> Michał

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