kern/106432: Record of disks (DVD-R) through the k3b program leads to lag of system

[Heiner]

The following reply was made to PR kern/106432; it has been noted by GNATS.

From: Heiner <h.eichmann at gmx.de>
To: bug-followup at freebsd.org,
 andrew at dobrohot.org
Cc:  
Subject: Re: kern/106432: Record of disks (DVD-R) through the k3b program leads to lag of system
Date: Sun, 10 Dec 2006 12:39:14 +0100

 Hi!
 
 As it works on 6.1 but does not work under 6.2 it indeed seems to be a kernel 
 bug. What might help the kernel hackers here is, if you start k3b from a 
 console (like kde's konsole). k3b prints out debugging information, like:
 
 k3b: (K3bDevice::ScsiCommand) transport command 0, length: 6
 k3b: (K3bDevice::ScsiCommand) transport failed (4): 145920
 
 This means, that cam_send_ccb is called with ccb.csio.cdb_io.cdb_bytes[0] == 0
 (hex) and ccb.csio.cdb_len == 6.
 
 This failed in this example. The exact meaning of the "(4): 145920" can be 
 seen in libk3bdevice/k3bscsicommand_bsd.cpp in the k3b port, which prints 
 this information. If more information is required, I am willing to patch k3b, 
 so that it prints out more debugging information. 
 
 A final note: k3b uses cdrecord and dvd+rw-tools for writing. But for reading 
 drive capabilites and analyzing the disks it uses direct scsi commands.
 
 I am afraid that's all I can do for the moment.
 
 
 Heiner