kern/72490: Panic mounting cdrom with RWCombo <SAMSUNG CDRW/DVD SM-308B/BS01>

[Claudio Destro]

The following reply was made to PR kern/72490; it has been noted by GNATS.

From: Claudio Destro <o1b6 at tiscali.it>
To: freebsd-gnats-submit at freebsd.org, o1b6 at tiscali.it
Cc:  
Subject: Re: kern/72490: Panic mounting cdrom with RWCombo <SAMSUNG CDRW/DVD SM-308B/BS01>
Date: Mon, 11 Oct 2004 14:39:33 +0200

 the exact error returned by the kernel is ENXIO "Device not configured"
 
 I tried to "ls /cdrom" after a successful re-mount (cacheing?), and then I 
 received:
 ...
 ac0: WARNING - removed from configuration
 acd0: WARNING - removed from configuration
 ls: /cdrom: Device not configured
 $
 
 after this message the kernel panics inside g_event:
 
 Fatal trap 12: page fault while in kernel mode
 fault virtual address   = 0x0
 fault code              = supervisor read, page not present
 instruction pointer     = 0x8:0xc04cd919
 stack pointer           = 0x10:0xcbd3cb7c
 frame pointer           = 0x10:0xcbd3cb94
 code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, def32 1, gran 1
 processor eflags        = interrupt enabled, resume, IOPL = 0
 current process         = 2 (g_event)
 trap number             = 12
 
 (sorry for the mess about info)
 
 -- 
 Claudio Destro