kern/89597: uncorrectable ATA disc errors can be corrected with acpi disabled

[Hans]

>Number:         89597
>Category:       kern
>Synopsis:       uncorrectable ATA disc errors can be corrected with acpi disabled
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Nov 26 18:30:05 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Hans
>Release:        6.0-R
>Organization:
Infomatik
>Environment:
FreeBSD nb.matik.com.br 6.0-RELEASE FreeBSD 6.0-RELEASE #2: Sat Nov 26 16:10:23 BRST 2005     h at nb.matik.com.br:/usr/src/sys/i386/compile/anb  i386 
>Description:
              after upgrading to 6.0RC1 and R I got HD errors like this 

Nov 26 08:32:35 nb kernel: ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=67582740
Nov 26 08:32:35 nb kernel: g_vfs_done():ad0s3e[READ(offset=8286093312, length=16384)]error = 5
Nov 26 08:32:38 nb kernel: ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=40<UNCORRECTABLE> LBA=67582740
Nov 26 08:32:38 nb kernel: g_vfs_done():ad0s3e[READ(offset=8286093312, length=16384)]error = 5
Nov 26 08:32:41 nb kernel: ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR> error=1<ILLEGAL_LENGTH> LBA=67582740
Nov 26 08:32:41 nb kernel: g_vfs_done():ad0s3e[READ(offset=8286093312, length=16384)]error = 5

on several PCs with ATA discs after system crash.

This with new and used ones. Since the erros could not be corrected by fsck i changed them.

This PC is a Notebook and I found the damaged block in a file in a user dir so I could use the PC still as another user.

I was booting then with hint.acpi.0.disabled=1 and to my surprise fsck identified the above error as DUPs and corrected them perfectly. I enabled acpi afterwards and the disk is clean.

I repeated this on another machine with a previous "uncorrectable" error and could repair it the same way. Other 2 disks I unfortunatly kicked into the trash :(

>How-To-Repeat:
              
>Fix:
              
>Release-Note:
>Audit-Trail:
>Unformatted: