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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/