kern/93885: ata(4) failure: SETFEATURES SET TRANSFER MODE semaphore timeout !! DANGER Will Robinson !!

[Jason Spence]

>Number:         93885
>Category:       kern
>Synopsis:       ata(4) failure: SETFEATURES SET TRANSFER MODE semaphore timeout !! DANGER Will Robinson !!
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Feb 27 04:10:08 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Jason Spence <jspence at lightconsulting.com>
>Release:        FreeBSD 6.1-PRERELEASE i386
>Organization:
none
>Environment:
System: FreeBSD graendal 6.1-PRERELEASE FreeBSD 6.1-PRERELEASE #2: Sun Feb 26 18:10:01 PST 2006 root at graendal:/usr/obj/usr/src/sys/GRAENDAL i386

Via EPIA M10000 LVDS motherboard
  http://www.via.com.tw/en/products/mainboards/mini_itx/epia_m/

Promise Fasttrack TX2200
  http://www.promise.com/product/product_detail_eng.asp?segment=RAID%200/1%20HBAs&product_id=128

  atapci1 at pci0:20:0:      class=0x010400 card=0x3571105a chip=0x3571105a rev=0x02 hdr=0x00
    vendor   = 'Promise Technology Inc'
    class    = mass storage
    subclass = RAID

2x  WDC WD2500JS-00MHB0 disks, firmware 02.01C03
  http://www.wdc.com/en/products/Products.asp?DriveID=135&Language=en

Disks are configured as a RAID 1 mirror, detected as ar0:
  [jspence at graendal ~]> sudo atacontrol status ar0
  ar0: ATA RAID1 subdisks: ad4 ad6 status: READY

>Description:
Under heavy disk load, such as a find / loop, the following message occurs:
  ad?: req=0x???????? SETFEATURES SET TRANSFER MODE semaphore timeout !! DANGER Will Robinson !!

The question mark characters change for each incident.  The message comes from ata-queue.c.

The machine becomes unresponsive even to power button events.  A hard reset is
required.

This bug is similar to or identical to kern/91408.

>How-To-Repeat:

Duplicate the above hardware configuration.  Execute the following script:
#!/bin/sh
while true; do
	find /
done

Wait a few minutes.

>Fix:
No fix known.


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