NetBSD Problem Report #39131

From apb@cequrux.com  Fri Jul 11 17:34:28 2008
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Date: Fri, 11 Jul 2008 17:29:31 +0000 (UTC)
From: apb@cequrux.com
To: gnats-bugs@gnats.NetBSD.org
Subject: drvctl -d com1 crashes the system
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>Number:         39131
>Category:       kern
>Synopsis:       drvctl -d com1 crashes the system
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jul 11 17:35:00 +0000 2008
>Originator:     Alan Barrett
>Release:        NetBSD 4.99.69
>Organization:
Not much
>Environment:
System: NetBSD 4.99.69
Architecture: i386
Machine: i386
>Description:
        I wanted to unplug a pcmcia modem card.  Due to the problem in
        PR 39035, I decided to try "drvctl -u pcmcia0" before physically
        removing the card.  That didn't work, so I tried "drvctl -u com1"
	(where com1 is one of the two com ports on this pcmcia card).
	The system paniced.

>How-To-Repeat:
        Start with a pcmcia card that has com1 at pcmcia0 and com2 at
        pcmcia0.

	$ sudo drvctl -d pcmcia0
	drvctl: DRVDETACHDEV: Not supported
	$ sudo drvctl -d com1
	com1: detached
	WARNING: SPL NOT LOWERED ON SYSCALL EXIT
	panic: cpu_switchto: switching above IPL_SCHED (8)
	fatal breakpoint trap in supervisor mode
	trap type 1 code 0 eip c04ff34c cs 8 eflags 246 cr2 bbbb4904 ilevel 8
	stopped in pid 25663.1 (drvctl) at netbsd:breakpoint+0x5: popl %ebp
	db{1}>

>Fix:
	Unknown

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