i386/112036: TIMEOUT - WRITE_DMA retrying, TIMEOUT - READ_DMA retrying

[Alvin Poon]

>Number:         112036
>Category:       i386
>Synopsis:       TIMEOUT - WRITE_DMA retrying, TIMEOUT - READ_DMA retrying
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Apr 23 16:00:09 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Alvin Poon
>Release:        6.2-RELEASE
>Organization:
>Environment:
FreeBSD deskpro.personal 6.2-RELEASE-p2 FreeBSD 6.2-RELEASE-p2 #0: Tue Feb 27 22:41:06 UTC 2007     root at i386-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
(6.2-RELEASE was binary-updated from 6.1-RELEASE, which in turn was binary-updated from 6.0-RELEASE)

can always find the following from /var/log/messages: (as an example)

.. kernel: ad2: TIMEOUT - READ_DMA retrying (1 retry left) LBA=39517024
.. kernel: ad2: TIMEOUT - READ_DMA retrying (1 retry left) LBA=129841472

dmesg output:
..
atapci0: <Intel ICH2 UDMA100 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x2460-0x246f at device 31.1 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
..
ad2: 305245MB <Seagate ST3320620A 3.AAC> at ata1-master UDMA100
..

pciconf -l -v output:
..
atapci0 at pci0:31:1:      class=0x010180 card=0x24118086 chip=0x244b8086 rev=0x01 hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82801BA (ICH2) UltraATA/100 IDE Controller'
    class    = mass storage
    subclass = ATA
..

'been looking on the 'net, and only found reference to this problem in releases before the 6.X branch (5.X, for example), so perhaps it's an unsolved bug?
>How-To-Repeat:
always happening...
>Fix:
unknown...
>Release-Note:
>Audit-Trail:
>Unformatted: