kern/63768: Must access /dev/acd0c before using /dev/acd0t1

[Carl Mascott]

>Number:         63768
>Category:       kern
>Synopsis:       Must access /dev/acd0c before using /dev/acd0t1
>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:   Thu Mar 04 08:40:26 PST 2004
>Closed-Date:
>Last-Modified:
>Originator:     Carl Mascott
>Release:        FreeBSD 4.8-RELEASE i386
>Organization:
none
>Environment:
System: FreeBSD callisto.local 4.8-RELEASE FreeBSD 4.8-RELEASE #0: Tue Oct 21 13:36:23 EDT 2003 cmascott at callisto.local:/usr/src/local_4/sys/compile/CAL480-001 i386

>Description:
	If /dev/acd0c has not been accessed since FreeBSD was booted
	then an attempt to access /dev/acd0t1 or any other individual
	track fails with a "Device not configured" error.

>How-To-Repeat:

	- create a device node for /dev/acd0t1 if you do not already
	  have one

	- shut down and reboot

	- insert a data CD in acd0 (but do not mount it) and
	  repeat the following:

	# dd if=/dev/acd0t1 bs=4b count=1 of=/dev/null
	dd: /dev/acd0t1: Device not configured
	# dd if=/dev/acd0c bs=4b count=1 of=/dev/null
	1+0 records in
	1+0 records out
	2048 bytes transferred in 0.301996 secs (6782 bytes/sec)
	# dd if=/dev/acd0t1 bs=4b count=1 of=/dev/null
	1+0 records in
	1+0 records out
	2048 bytes transferred in 0.000377 secs (5433229 bytes/sec)

>Fix:

	Unknown


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