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

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