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

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Date:	Wed, 18 May 2011 18:29:34 +0200
From:	Stevie Trujillo <stevie.trujillo@...il.com>
To:	Milton Miller <miltonm@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to get backtrace? modprobe -r iwlagn; modprobe iwlagn kills kernel

On Wednesday 18 May 2011 17:55:01 Milton Miller wrote:
> On Wed May 18 2011 about 10:37:54 EST, Stevie Trujillo wrote:
> > 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 are some macros available, but basically log_buf is a pointer
> to a buffer of length log_buf_len initialized to __log_buf (but can
> be expanded via the command line or sysctl, in). log_end is the
> end of the buffer.  If you haven't wrapped then just print log_end
> characters.

Thank you! This worked perfectly. I sent it to linux-wireless now.
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