burncd- acd0: FAILURE - START_STOP timed out

[Christian Gründemann]

Hello!

I have some strange errors with burning a DVD.
In the beginning of the burn-process, burncd stopps
and writes the following output to /var/log/messages.

Jul 27 23:21:36 master kernel: acd0: FAILURE - START_STOP timed out
Jul 27 23:22:06 master kernel: acd0: TIMEOUT - READ_BIG retrying (2 retries
left)
Jul 27 23:22:36 master kernel: acd0: WARNING - READ_BIG interrupt was seen
but timeout fired
Jul 27 23:23:06 master kernel: acd0: WARNING - READ_BIG interrupt was seen
but taskqueue stalled

After the aborted burn-process, neither the system is accessible
via ssh nor any other process do their normal job. (Even though
some processes "seems" to work, e.g. ssh asks me about login/password
but doesn't give me access to the machine.) Furthermore, it is not
possible to manually eject the DVD by pressing the eject button
or by using the "cdrontrol eject" command. Unfortenuately, a reboot helps.

Due to the fact that the obove mentioned error occurs exactly
once a week with the same DVD-media, I suppose that this
media is the originator of the problem. But anyhow, shouldn't
the system be in a stable mode, even if I use a bad media?

And maybe someone can give me a hint what
the kernel message means?

Thanks for clearing that up!
Christian


uname -rps : FreeBSD 5.2.1-RELEASE-p6 i386

burncd command:  /usr/sbin/burncd -q -f /dev/acd0 -s max dvdrw  image.iso
2>&1 | tee -a ${LOGFILE}

atacontrol info 1
Master: acd0 <PLEXTOR DVDR PX-504A/1.01> ATA/ATAPI rev 0
Slave:       no device present

dmesg | grep -A1 -B1 -i acd0
IP Filter: v3.4.31 initialized.  Default = block all, Logging = enabled
acd0: CDRW <PLEXTOR DVDR PX-504A> at ata1-master PIO4
em0: Link is up 1000 Mbps Full Duplex