Panic: don't do that ... while unloading snd_ich.ko

[Michael Nottebrock]

Readily reproducable, 5.4-STABLE as of last week.

Kernel messages prior to panic (from memory):

pcm0: unregister: mixer busy
WARNING: Driver mistake: destroy_dev on 30/3

Backtrace:

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#0  0xc04ea796 in doadump () at pcpu.h:160
160             __asm __volatile("movl %%fs:0,%0" : "=r" (td));
(kgdb) bt
#0  0xc04ea796 in doadump () at pcpu.h:160
#1  0xc04eacc0 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:413
#2  0xc04eaf54 in poweroff_wait (junk=0xc067dd2a, howto=-1066935045) 
at /usr/src/sys/kern/ker
#3  0xc04c455a in idestroy_dev (dev=0xc337e190) 
at /usr/src/sys/kern/kern_conf.c:563
#4  0xc04c4684 in destroy_dev (dev=0xc06d3428) 
at /usr/src/sys/kern/kern_conf.c:612
#5  0xc07a0f6c in ?? ()
#6  0xc06d3428 in devt_stash ()
#7  0xc2379980 in ?? ()
#8  0xc2379980 in ?? ()
#9  0xc2324200 in ?? ()
#10 0xe96c2c18 in ?? ()
#11 0xc07b0d7e in ?? ()
#12 0xc2379980 in ?? ()
#13 0xc2379980 in ?? ()
#14 0xc2379980 in ?? ()
#15 0xe96c2c30 in ?? ()
#16 0xc04feb37 in device_detach (dev=0xc23b65e0) 
at /usr/src/sys/kern/subr_bus.c:2301
Previous frame inner to this frame (corrupt stack?)

-- 
   ,_,   | Michael Nottebrock               | lofi at freebsd.org
 (/^ ^\) | FreeBSD - The Power to Serve     | http://www.freebsd.org
   \u/   | K Desktop Environment on FreeBSD | http://freebsd.kde.org
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