Date: Tue, 1 May 2007 03:01:57 -0300 From: "Alejandro Pulver" <alepulver@FreeBSD.org> To: "FreeBSD gnats submit" <FreeBSD-gnats-submit@FreeBSD.org> Subject: kern/112282: atacontrol(8): changing DMA modes when disk is reading/writing crashes Message-ID: <1177999317.1472@deimos.mars.bsd> Resent-Message-ID: <200705010610.l416A6T0079144@freefall.freebsd.org>
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>Number: 112282
>Category: kern
>Synopsis: atacontrol(8): changing DMA modes when disk is reading/writing crashes
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue May 01 06:10:06 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator: Alejandro Pulver
>Release: FreeBSD 6.2-RELEASE i386
>Organization:
>Environment:
System: FreeBSD 6.2-RELEASE #0: Fri Jan 12 11:05:30 UTC 2007
root@dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/SMP
>Description:
I have a FreeBSD machine which changes ATA modes correctly when the disk is idle, but when it is reading/writing (moderate/high load) the system freezes after the command returns, and the disk light keeps on.
The specifications of my machine are available here (the files containing "_1"; well, it has FreeBSD 6.2 now, not 6.1):
http://people.freebsd.org/~alepulver/disk-crash.tar.bz2
If you need more information just ask me.
>How-To-Repeat:
For example (by default is in UDMA133):
# atacontrol mode ad2 UDMA100
# atacontrol mode ad2 UDMA133
I could not reproduce the problem in my other machine which has a SATA disk and seems locked to the SATA300 mode (although one attempt to change it froze the system, keeping the disk light off; instead of rejecting the mode). This machine's specifications are in the files containing "_2" (see above).
>Fix:
None that I know.
>Release-Note:
>Audit-Trail:
>Unformatted:
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