kern/82668: ATA timeouts on 5.4-stable

[Matthias Buelow]

>Number:         82668
>Category:       kern
>Synopsis:       ATA timeouts on 5.4-stable
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jun 26 15:00:31 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Matthias Buelow
>Release:        FreeBSD 5.4-STABLE i386
>Organization:
>Environment:
System: FreeBSD xxx 5.4-STABLE FreeBSD 5.4-STABLE #3: Thu Jun 23 13:51:15 CEST 2005 root at xxx:/usr/obj/usr/src/sys/xxx i386


	
>Description:

    Since I upgraded to 5.4-STABLE on June 21, I occasionally get on
    boot the following:

    ad4: TIMEOUT - READ_DMA retrying (2 retries left) LBA=0
    ad4: FAILURE - ATA_IDENTIFY timed out
    ad4: FAILURE - ATA_IDENTIFY timed out
    ad4: WARNING - removed from configuration
    ata2-master: FAILURE - READ_DMA timed out

    at which point the kernel gives up since it cannot find the root fs.

    This seems to happen only at boot, and not everytime (perhaps
    at 1/4 of all boot attempts, on average). If the machine actually
    manages to boot, then all seems well, and I haven't yet seen it
    when the system was running. Windows XP is also on the box and it
    doesn't seem to have any problems. I also didn't encounter any
    problems of that kind with earlier 5.4-STABLE snapshots.

    The machine is using the Intel ICH6 chipset, with disk and controller
    as following:

    atapci1: <Intel ICH6 SATA150 controller> port 0xfea0-0xfeaf,0xfe30-0xfe33,0xfe20-0xfe27,0xfe10-0xfe13,0xfe00-0xfe07 irq 20 at device 31.2 on pci0
    ad4: 152627MB <ST3160023AS/8.05> [310101/16/63] at ata2-master SATA150

>How-To-Repeat:
>Fix:



>Release-Note:
>Audit-Trail:
>Unformatted: