From owner-freebsd-stable@FreeBSD.ORG  Tue Dec 10 13:24:42 2013
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Date: Tue, 10 Dec 2013 08:14:26 -0500 (EST)
From: Frank Seltzer <frank_s@bellsouth.net>
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To: freebsd-stable@freebsd.org
Subject: Multiple errors after upgrade to 10.0-PRERELEASE
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Morning All,

I upgraded from 9.2-STABLE to 10.0-PRERELEASE #0 r259144 last night and I 
am now getting this every 2 seconds in /var/log/messages:

Dec 10 07:54:31 Shop kernel: ata1: FAILURE - zero length DMA transfer attempted
Dec 10 07:54:31 Shop kernel: ata1: setting up DMA failed

cat /var/log/messages | grep ata1:

cd0 at ata1 bus 0 scbus3 target 0 lun 0
cd0: <TSSTcorp DVD-ROM TS-H352C DE02> Removable CD-ROM SCSI-0 device
cd0: 33.300MB/s transfers (UDMA2, ATAPI 12bytes, PIO 65534bytes)
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray closed
cd1 at ata1 bus 0 scbus3 target 1 lun 0
cd1: <PHILIPS DVD+-RW DVD8701 5D24> Removable CD-ROM SCSI-0 device
cd1: Serial Number MY0P92257015956T02SA
cd1: 33.300MB/s transfers (UDMA2, ATAPI 12bytes, PIO 65534bytes)
cd1: Attempt to query device size failed: NOT READY, Medium not present

I have also gotten this 10 times so far:

pid 12172 (dtrace), uid 0: exited on signal 11 (core dumped)

and this during boot:

pnpbios: Bad PnP BIOS data checksum

System is a Dell Precision 670, BIOS rev A07 with 3G of memory.

What can be causing these problems?

Thanks,
Frank