From owner-freebsd-hackers@FreeBSD.ORG  Wed Dec  6 14:29:01 2006
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Date: Wed, 6 Dec 2006 15:02:20 +0100
From: "Niclas Zeising" <niclas.zeising@gmail.com>
To: ros <ros@bebik.net>
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References: <457319DC.7030403@bebik.net>
Cc: freebsd-hackers@freebsd.org
Subject: Re: Burning RW cdrom error message
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On 12/3/06, ros <ros@bebik.net> wrote:
> Trying to burn a RW CDROM, I notice the CD-ROM device was freeze and
> nothing happen. After a hard reboot (I turn off completly the computer),
> I find this message on the /var/log/message file
>
> Dec  3 19:04:40 bill kernel: acd0: req=0xc24e5258 SEND_OPC_INFO
> semaphore timeout !! DANGER Will Robinson !!
> Dec  3 19:04:42 bill kernel: acd0: req=0xc2063258 SETFEATURES SET
> TRANSFER MODE semaphore timeout !! DANGER Will Robinson !!
>

This is an old bug, I think. I've seen the message before. Which
version of FreeBSD do you use?
Try googling around for the error message and look through the list
archives, you'll probably find something about the error there.
Regards!
//Niclas
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