acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00

[Joe Altman]

The subject line contains the dmesg that indicates...something; the
symptom is that CDs aren't seen by the drive:

acd0: CDRW <PLEXTOR CD-R PX-W1610A/1.04> at ata1-master PIO4

uname -a

FreeBSD chthonic.chthonixia.net 6.2-STABLE FreeBSD 6.2-STABLE #0: Wed
May 16 00:16:21 EDT 2007
root at chthonic.chthonixia.net:/usr/obj/usr/src/sys/CHTHONIC  i386

Old kernel and associated modules:

May 11, 21:35 EDT. 

Looking via Google for the error turns up this thread on -stable:

========

Andrei V. Lavreniyuk bamston at reactor-xg.kiev.ua
Mon Apr 23 09:08:54 UTC 2007

Hi!

> I believe the culprit is somewhere in a recent MFC to atapi-cam.c
> (rev 1.42.2.3) reverting to rev 1.42.2.2 fixes both the k3b system
> hangs and "INQUIRY ILLEGAL REQUEST" errors here.

I utillized the version of atapi-cam.c (rev. 1.42.2.1) and all works
normally.

===

I have this version of the file:

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/dev/ata/atapi-cam.c,v 1.42.2.5 2007/05/15 16:19:42 thomas Exp $");

So AFAICT, either this was not the relevant file; or a fix for the
bug was never committed; or perhaps a fix was committed, but doesn't
quite work; or perhaps the bug crept back in...but I don't know.

In any event, I need a clue: is this file, atapi-cam.c, the one to
assume contains the source of this error? If so, I suppose I need to
submit a bug report.

Thanks, and best regards,

Joe