kern/89224: [sound]kernel panic after kldunload snd_maestro3

Vladimir V. Pavluk vladvic_r at
Fri Nov 18 10:40:14 GMT 2005

>Number:         89224
>Category:       kern
>Synopsis:       [sound]kernel panic after kldunload snd_maestro3
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Nov 18 10:40:13 GMT 2005
>Originator:     Vladimir V. Pavluk
>Release:        FreeBSD 5.4-RELEASE-p8
Digital Service, LLC
FreeBSD 5.4-RELEASE-p8 FreeBSD 5.4-RELEASE-p8 #9: Mon Nov 14 16:08:05 NOVT 2005     root at  i386
kldunload snd_maestro3 causes kernel panic. This happens only after kmix (KDE mixer program) have been ran. This is an output of dmesg after such panic:
(kldunload while kmix is running)
pcm0: unregister: mixer busy
(kldunload after exit kmix)
WARNING: Driver mistake: destroy_dev on 0/0
panic: don't do that
Uptime: 52m31s
Cannot dump. No dump device defined.
Automatic reboot in 15 seconds - press a key on the console to abort

I'm running on Compaq Evo N600c.
This happens both with and without maestro3 patch [pr 89046].
1) kldload snd_maestro3 (if not already loaded)
2) run kmix
3) try to kldunload snd_maestro3 (should say that device busy)
4) exit kmix
5) kldunload snd_maestro3

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