kern/71999: recurring panic in -stable: ata_dmasetup: transfer active on this device!

[Mikhail Teterin]

>Number:         71999
>Category:       kern
>Synopsis:       recurring panic in -stable: ata_dmasetup: transfer active on this device!
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Sep 22 15:50:24 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Mikhail Teterin
>Release:        FreeBSD 4.10-STABLE i386
>Organization:
Virtual Estates, Inc.
>Environment:
System: FreeBSD 4.10-STABLE #0: Mon Aug 30 17:23:44 EDT 2004 root at symbion:/opt/src/sys/compile/TRISTAR i386

>Description:

	The panic occurs during the X-session, so we don't see much. According
	to the dmesg upon reboot, however, it is:

		panic: ata_dmasetup: transfer active on this device!

		syncing disks... 25 3 3 3 3 3 3 3 6 2 2 2 2 2 2 2 4 
		done
		Uptime: 6d23h8m36s

>How-To-Repeat:

	We don't know exactly, what triggers it. Sometimes it is in the middle
	of the user doing something, sometimes it happens at night (during the
	daily runs?) Sometimes they notice, but the speakers suddenly going
	silent. But it happens once or twice per week and is...

	There are two disks in the system (I wish, the panic message did not
	use any pronouns!). The swap is on both of them:

	Device          1K-blocks     Used    Avail Capacity  Type
	/dev/rad0b         262016    71476   190540    27%    Interleaved
	/dev/rad2b        1048448    71260   977188     7%    Interleaved
	Total             1310464   142736  1167728    11%

	The full dmesg.boot (beginning with the panic message) can be found
	at:

		http://virtual-estates.com/~mi/symbion.dmesg.boot

>Fix:

	May be, forcing the ATA mode for the newer disk from UDMA100 down
	will be a work-around?
>Release-Note:
>Audit-Trail:
>Unformatted: