linux-kernel - Re: help to bisect

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Message-ID: <4DD45D2D.7060300@lockie.ca>
Date:	Wed, 18 May 2011 19:58:37 -0400
From:	James <bjlockie@...kie.ca>
To:	Borislav Petkov <bp@...en8.de>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-wireless@...r.kernel.org
Subject: Re: help to bisect

On 05/18/11 17:17, Borislav Petkov wrote:
> First of all, please hit "reply-to-all" next time so that all recipients
> can receive your mail and not find it by chance when looking thru the
> new lkml messages.
>
> On Wed, May 18, 2011 at 04:41:52PM -0400, James wrote:
>> Here is what I did:
>>
>> $ git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-2.6.37.y.git
>> $ cd linux-2.6.37.y
>> $ git checkout v2.6.36
>> build and boot kernel
> what does that mean? Is .36 ok?
Yes, no problems.
>> $ cd linux-2.6.37.y
>> $ git bisect start
>> $ git bisect good v2.6.36
>> $ git bisect bad v2.6.37.6
> Also, is .37.6 bad?
Yes, it is bad.
>> build and boot kernel
>> git bisect good|bad
>> repeat
>>
>> 3044100e58c84e133791c8b60a2f5bef69d732e4 is the first bad commit.
> Which is a merge commit and it means that you most likely made a mistake
> during bisection.
Am I doing it right?
boot kernel, cd to git source, git bisect good or bad, compile new
kernel and copy it to /boot, repeat
> What is actually the problem you're experiencing with .37.6?
>
> ..
>
>> How do I find out what change causes the problem?
>> The problem causes my wireless card not to work.
> Ah, here it is.
>
>> Other people have similar cards that do work so the problem seems
>> isolated to my hardware but kernel-2.6.36 works so I don't think my
>> hardware is faulty.
> Which card is that? (adding linux-wireless)
D-Link dwa552
ieee80211 phy0: Atheros AR5416 MAC/BB Rev:2 AR2133 RF Rev:81
mem=0xffffc90000140
000, irq=16
Other people have this card working so it is probably my system
configuration that is causing an obscure bug.

> Please, describe in a very detailed way how your problem incarnates
> itself: dmesg, error messages, what exactly do you do to trigger it?
It seems to be 100% that if "ath: Failed to stop TX DMA in 100 msec
after killing last frame
ath: Failed to stop TX DMA!" shows up in dmesg that scans don't return
any APs or 1-3 (iwlist wlan0 scan | grep SSID).
If there is a different way to scan, I'll try that.



> Also, can you test whether 38.6 works for ya - it could've been fixed in
> the meantime. You can also test .39 which will be released any minute
> now.
38.6 does NOT work and compat-wireless-2011-05-11 works on kernel-2.6.36
which is why I think it is the kernel and not the wireless code.
> I think that should be enough for now.
>

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