Re: Linux 2.5.73 - panic (freed memory) on CD-Recorder errors

[Jens Axboe]

On Mon, Jun 23 2003, Pavel Roskin wrote:
> Hello!
> 
> I have been experiencing kernel panics with 2.5.x kernels when writing
> oversized images like Knoppix to low-quality CDs using the IDE driver
> without SCSI emulation.
> 
> Finally I have found a very simple way to reproduce the panic immediately
> and without sacrificing a blank CD.  Just try writing over a recorded disc
> in the dummy mode (i.e. with the laser turned off).
> 
> I have captured the panic on the serial console.  cdrecord was running on
> that terminal as well, so you see the order in which it happened.  The
> kernel .config file and the kernel messages (without serial console being
> active) are attached.
> 
> This panic occurred on Linux 2.5.73, but I remember the same function
> names in the stack trace with older 2.5.x kernels when I was writing
> Knoppix.
> 
> Note 6b6b6b6b in the eax and esi registers and on the stack.  That must be
> freed memory. __end_that_request_first() is a static function in
> drivers/block/ll_rw_blk.c

That doesn't look good. I'll try and reproduce + fix here, thanks for
the report.

-- 
Jens Axboe