Re: ath9k crash 3.2-rc7

From: Mohammed Shafi <shafi.wireless@gmail.com>
To: MR <g7af0ec1e3ea1e7b1@nextmail.ru>
Cc: linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org
Subject: Re: ath9k crash 3.2-rc7
Date: Fri, 6 Jan 2012 14:32:55 +0530	[thread overview]
Message-ID: <CAD2nsn1-Oo=n8CY97sXW=kfsEeE2oknpXLayMtyxRA7VMMkHmQ@mail.gmail.com> (raw)
In-Reply-To: <NEXT-4f06aa69274cf6.26578607@nextmail.ru>

2012/1/6 MR <g7af0ec1e3ea1e7b1@nextmail.ru>:
>  > >  > :) no problem. i hope for you can recreate the issue consistently ,
>  > >  > can you please test with the attached patch and another debug patch.
>  >>  > please let me know if there is no panic but there are warnings (or)
>  >if
>  > >  > there are no warnings (or) the issue still appears(also the trace
>  > >  > thanks) , also if you need any help
>  > > Should I apply the patch to Linux 3.2-rc7 or 3.2 release?
>  >Oh, I see. 3.2 release has this fix already. I will build it with
> debugging
>  > patch and report warnings now.
>
> I have some unpleasant news: it looks like it takes slightly longer with the
> fix, but the crash still managed to occur with 3.2 and I lack ESP to check
> for warnings immediately before that. I thought that 8 hours is enough
> testing, heh. It simply took 9 and a half under nigh-ideal conditions
> (stable signal from fixed AP with notebook also steadily in one place).

:(  i had put those warnings to prevent the crash itself and what's causing it.
may be i had missed that pos can be < 0 in addition to (pos > 37).
i am just looking at those areas of code for some other issue. hope i
can a find a fix
for both of them

>
> Good news is that I remembered to decrease console font size before the
> crash. So now I could see that the long stack trace was just a decoy to
> ensure that the first Oops scrolls too far up. I now have photos of the
> first one, too.
>
> Process: kworker/u:2 (pid: 1419, threadinfo ffff88013dc38000, task
> ffff8800891020d0)
> Stack:
>  ffff88013dc39c10 ffff880136111ae0 ffff880136110460 0000000000000040
>  ffff880136114000 0000000000000000 ffff88013dc39d20 ffffffffa0560a35
>  0000000000000001 0000000000000202 ffff8801361140f0 ffff88013ed3ea48
> Call trace:
>  ath9k_config+0x115/0x780 [ath9k]
>  ? queue_work+0x1a/0x20
>  ? queue_delayed_work+0x25/0x30
>  ? ieee80211_queue_delayed_work+0x46/0x60 [mac80211]
>  ? ath9k_flush+0x155/0x1d0 [ath9k]
>  ieee80211_hw_config+0xe2/0x160 [mac80211]
>  ieee80211_scan_work+0x243/0x5c0 [mac80211]
>  ? __schedule+0x2d7/0x7b0
>  ? ieee80211_scan_rx+0x1c0/0x1c0 [mac80211]
>  process_one_work+0x111/0x390
>
> Only after this happens "unable to complete kernel paging request" in
> ath_update_survey_stats
>  worker_thread+0x162/0x340
>  ? manage_workers.clone.26+0x240/0x240
>  kthread+0x96/0xa0
>  kernel_thread_helper+0x4/0x10
>  ? kthread_worker_fn+0x190/0x190
>  ? gs_change+0x13/0x13
>
>

-- 
shafi