netdev - Re: How to get backtrace? modprobe -r iwlagn; modprobe iwlagn kills kernel

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Message-ID: <BANLkTinQQwwgPGsX0YSpWJXN5oaatd1Q5g@mail.gmail.com>
Date:	Thu, 19 May 2011 00:02:55 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Milton Miller <miltonm@....com>
Cc:	Stevie Trujillo <stevie.trujillo@...il.com>,
	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: How to get backtrace? modprobe -r iwlagn; modprobe iwlagn kills kernel

On Wed, May 18, 2011 at 11:55 PM, Milton Miller <miltonm@....com> wrote:
> On Wed May 18 2011 about 10:37:54 EST, Stevie Trujillo wrote:
>> I'm having some problem getting a backtrace. When I do "modprobe -r
>> iwlagn; modprobe iwlagn" (2.6.38.6 with Intel-1030N) the kernel crashes
>> (sometimes I need to try 2 or 3 times, and sometimes the modprobe -r
>> is the one that crashes).
>>
>> This spams my monitor with several oops/panics before it finally
>> dies. I can only see bottom of the last one, which probably isn't
>> very meaningful.  I tried loading netconsole, but I only get one or
>> two lines before it stops sending/printing.
>>
>> I then tried kexec+crashkernel, but I only managed to get a backtrace
>> for the last panic (which I think is just a result of memory corruption
>> or something).  Finally I tried compiling ramoops into my kernel,
>> but it didn't want to load because of "No such device".
>
> For the kexec+crashkernel, try to retrieve the kernel log buffer:
>

There is a utility in kexec-tools, named vmcore-dmesg, which
is supposed to do this kind of thing.
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