panic: don't do that, in ugen(4)

Running `quickcam' twice from:
	http://people.freebsd.org/~jmallett/qce-freebsd.tgz

Yields the following loveliness:

%%%
Script started on Tue May 27 17:59:35 2003
(jmallett_at_big-lizard:~)1% gdb -k /boot/kernel/kernel vmcore.0 

GNU gdb 5.2.1 (FreeBSD)
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-undermydesk-freebsd"...
(no debugging symbols found)...
panic: bremfree: removing a buffer not on a queue
panic messages:
---
panic: don't do that

syncing disks, buffers remaining... 1806 panic: bremfree: removing a buffer not on a queue
Uptime: 6m34s
Dumping 191 MB
ata0: resetting devices ..
ata0: pre reset mask=03 ostat0=50 ostat2=00
ad0: ATAPI 00 00
ata0-slave: ATAPI 00 00
ata0: after reset mask=03 stat0=50 stat1=00
ad0: ATA 01 a5
ata0: devices=01
ad0: success setting BIOSPIO on Intel PIIX4 chip
done
ad0: timeout waiting for DRQata0: resetting devices ..
ata0: pre reset mask=03 ostat0=d0 ostat2=d0
ad0: ATAPI 00 00
ata0-slave: ATAPI 00 00
ata0: after reset mask=03 stat0=50 stat1=00
ad0: ATA 01 a5
ata0-slave: ATA 01 a5
ata0: devices=03
ata0-slave: timeout waiting for cmd=ec s=00 e=00
ata0-slave: ATA identify failed
ad0: success setting BIOSPIO on Intel PIIX4 chip
done
 16 32 48 64 80 96 112 128 144 160 176
---
Reading symbols from /boot/kernel/acpi.ko...(no debugging symbols found)...
done.
Loaded symbols for /boot/kernel/acpi.ko
Reading symbols from /boot/kernel/logo_saver.ko...
(no debugging symbols found)...done.
Loaded symbols for /boot/kernel/logo_saver.ko
#0  0xc030d6eb in doadump ()
(kgdb) bt
#0  0xc030d6eb in doadump ()
#1  0xc030dd13 in boot ()
#2  0xc030e05b in panic ()
#3  0xc0351e12 in bremfreel ()
#4  0xc0351cf5 in bremfree ()
#5  0xc0355397 in getblk ()
#6  0xc0351ef2 in breadn ()
#7  0xc0351e9c in bread ()
#8  0xc04273d2 in ffs_update ()
#9  0xc043bc5f in ffs_fsync ()
#10 0xc043acfe in ffs_sync ()
#11 0xc03677fb in sync ()
#12 0xc030d92d in boot ()
#13 0xc030e05b in panic ()
#14 0xc02ede12 in destroy_dev ()
#15 0xc02a369f in ugen_destroy_devnodes ()
#16 0xc02a48db in ugen_set_interface ()
#17 0xc02a4e2c in ugen_do_ioctl ()
#18 0xc02a5367 in ugenioctl ()
#19 0xc02d538e in spec_ioctl ()
#20 0xc02d4ac8 in spec_vnoperate ()
#21 0xc036fbe1 in vn_ioctl ()
#22 0xc0334098 in ioctl ()
#23 0xc049a27e in syscall ()
---Type <return> to continue, or q <return> to quit---
#24 0xc04896ed in Xint0x80_syscall ()
---Can't read userspace from dump, or kernel process---

(jmallett_at_big-lizard:~)2% uname -a

FreeBSD big-lizard.backyard.newgold.net 5.1-BETA-20030522-JPSNAP FreeBSD 5.1-BETA-20030522-JPSNAP #0: Thu May 22 00:15:14 GMT 2003     root_at_ushi.jp.freebsd.org:/usr/obj/usr/src/sys/GENERIC  i386
Script done on Tue May 27 18:01:06 2003
%%%

Thanx,
juli.
-- 
juli mallett. email: jmallett_at_freebsd.org; efnet: juli;