linux-kernel - Re: [KERNEL] Re: Kernel freeze on 2.4.36.7

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Message-ID: <20081005204247.GA3781@ikki.ethgen.de>
Date:	Sun, 5 Oct 2008 21:42:54 +0100
From:	Klaus Ethgen <Klaus@...gen.de>
To:	Willy Tarreau <w@....eu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [KERNEL] Re: Kernel freeze on 2.4.36.7

Am So den  5. Okt 2008 um 18:18 schrieb Willy Tarreau:
> > I got a new barcode scanner and plugged it into USB. The scanner works
> > well until I remove it. In that second I get a trace and the kernel
> > freeze.
> 
> Does it happen everytime you unplug it or only once in a while ?

Everytime.

Well, thats not that true. It WAS everytime until I close all
applications and did sync several times before I unplug the device. When
I wait a view seconds after the sync the freeze is reproducible.

> Also, have you ever been running and older 2.4 kernel not causing this
> problem ?

I did buy the scanner only days ago. I did not use older kernels since
then. (I have to compile some if it is needed.)

> > The message when I unplug it:
> >  Unable to handle kernel NULL pointer dereference at virtual address 00000048
> >  ...
> 
> Does the same problem happen when you plug/unplug a USB keyboard on the
> same machine ?

Yes. I just tested it and my machine was frozen.

> > Please pardon that I do not type the complete kernel dump as I know no
> > way to log it to a text file in this case where the system freeze. But
> > on request I can send the picture I made with my camera.
> 
> Yes, it would help a lot. That along with your kernel config and an
> lsmod and dmesg outputs before the problem. Ideally, you should pass
> the messages output through ksymoops with all modules loaded as before
> the problem happens.

It should be on this mail.

> If you want to more easily capture your messages, you can connect
> another machine to your serial port and boot with "console=ttyS0".

Thats not possible as I did not compile the serial console into the
kernel.

Regards
   Klaus Ethgen
-- 
Klaus Ethgen                            http://www.ethgen.de/
pub  2048R/D1A4EDE5 2000-02-26 Klaus Ethgen <Klaus@...gen.de>
Fingerprint: D7 67 71 C4 99 A6 D4 FE  EA 40 30 57 3C 88 26 2B

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View attachment "config-2.4.36.7" of type "text/plain" (30851 bytes)

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