kern/72050: In PC9821 system, An ATA device driver hanged with heavy disk load.

[Rotus]

>Number:         72050
>Category:       kern
>Synopsis:       In PC9821 system, An ATA device driver hanged with heavy disk load.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Sep 24 05:40:21 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Rotus
>Release:        FreeBSD 6.0-Current
>Organization:
>Environment:
FreeBSD amaterasu.takamanohara.org 6.0-CURRENT FreeBSD 6.0-CURRENT #0: Sat Sep 18 09:39:42 JST 2004     root at amaterasu.takamanohara.org:/usr/obj/usr/src/sys/AMATERASU  i386
    
>Description:
In PC9821 system, An ATA device driver hanged with heavy disk load.
When disk load is not so heavy, Warning is as follows,
 kernel: ad0: TIMEOUT - WRITE_MUL retrying (2 retries left) LBA=3572264
 kernel: ad0: WARNING - WRITE_MUL no interrupt but good status.
In any timing, system hanged with disk access ( access lamp turn on ).
  
>How-To-Repeat:
Source building with Ports in two process.     
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted: