DOH! ata_alloc_composite failed!

[Mike Jakubik]

I just noticed these messages in my security log on one of my production 
servers, running 6.1. Can anyone shed some light as to what is going on 
here? This is a dual core opteron system, on a tyan mb, with a nvidia 
chipset. The filesystem is on the nvidia raid1 controller.

FreeBSD 6.1-RELEASE #0: Tue May  9 23:55:03 EDT 2006
    root at xxx:/usr/obj/usr/src/sys/SONIC_NS1
ACPI APIC Table: <Nvidia AWRDACPI>
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Dual Core AMD Opteron(tm) Processor 170 (2009.27-MHz K8-class CPU)

atapci1: <nVidia nForce CK804 SATA300 controller> port 
0x9f0-0x9f7,0xbf0-0xbf3,0x970-0x977,0xb70-0xb73,0xd400-0xd40f mem 
0xfebfc000-0xfebfcfff irq 21 at device 7.0 on pci0

ad4: 114473MB <Seagate ST3120813AS 3.AAD> at ata2-master SATA300
ad6: 114473MB <Seagate ST3120813AS 3.AAD> at ata3-master SATA300
ar0: 114473MB <nVidia MediaShield RAID1> status: READY
ar0: disk0 READY (master) using ad4 at ata2-master
ar0: disk1 READY (mirror) using ad6 at ata3-master

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May 13 03:01:29 ns1 kernel: DOH! ata_alloc_composite failed!
May 13 03:01:29 ns1 last message repeated 2 times