linux-kernel - Re: rtlwifi: regression 39-rc5 (rtl8192ce)

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Message-ID: <4DBEC462.2080805@lwfinger.net>
Date:	Mon, 02 May 2011 09:49:06 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Shawn Nock <nock@...ko.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: rtlwifi: regression 39-rc5 (rtl8192ce)

On 05/02/2011 09:26 AM, Shawn Nock wrote:
> Larry Finger<Larry.Finger@...inger.net>  writes:
>
>> On 05/01/2011 12:59 PM, Shawn Nock wrote:
>>> During heavy network traffic (esp. flash video) I see the attached
>>> NULL pointer dereference in 2.6.39-rc5 on an IBM Thinkpad
>>> x120e. Immediately afterward a "scheduling while atomic" bug is
>>> reported and the system becomes unresponsive. I am unable to produce
>>> this problem in 2.6.38.4.
>>> See attached backtrace and dmesg. Please let me know what I can
>>> collect to make this problem easier to troubleshoot.
>>
>> Could you also supply the instruction byte sequence for the oops? It
>> is the "Code:" line of the dump.
>
> I had not been able to capture that, as the scheduler oops was triggered
> during the call stack dump (before the Code line).
>
>> I think you are using a 32-bit system. Is that correct?
>
> Correct.
>
>> Is there one URL that exposes this problem? If so, please sent that as
>> well.
>
> It had been speedtest.net (which *used* to crash this all the
> time). I've since re-configured the kernel to allow it to build faster
> (fedora .config trimmed to remove a lot of the unneeded modules). I can
> no longer trigger this BUG.
>
> I originally thought that this may be because I enabled the 8192CU
> driver, but clean kernel without it also doesn't trigger the bug. My new
> hypothesis is that building the kernel for the AMD processor type was a
> mistake (the only other significant change was that I went back to
> Pentium Pro as the CPU target).
>
> As far as I can tell this problem is resolved (20+ hours without issue,
> less than 20 min previously) and probably due to GCC not being aware of
> this (newish) AMD processor.
>
> Sorry for the false alarm and thanks,

No problem. Let me know if it resurfaces again.

Larry
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