-CURRENT system panic

Hello!

My system just crashed and captured the following dump. Please let me 
know if I should provide any further information.

# uname -a
FreeBSD blah 5.0-CURRENT FreeBSD 5.0-CURRENT #0: Sun Apr 27 19:02:12 
CEST 2003     root_at_blah:/usr/obj/usr/src/sys/GENERIC  i386

(The sources are from approximately 5:00 PM CEST of the same day.)

# gdb -k /var/crash/kernel.debug.0 /var/crash/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"...
panic: bremfree: removing a buffer not on a queue
panic messages:
---
panic: ffs_blkfree: freeing free block

syncing disks, buffers remaining... panic: bremfree: removing a buffer 
not on a queue
Uptime: 7h40m19s
Dumping 767 MB
ata0: resetting devices ..
done
[CTRL-C to abort]  16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 
256 272 288 304 320 336 352 368 384 400 416 432 448 464 480 496 512 528 
544 560 576 592 608 624 640 656 672 688 704 720 736 752
---
Reading symbols from /boot/kernel/snd_pcm.ko...done.
Loaded symbols for /boot/kernel/snd_pcm.ko
Reading symbols from /boot/kernel/snd_emu10k1.ko...done.
Loaded symbols for /boot/kernel/snd_emu10k1.ko
Reading symbols from /boot/kernel/acpi.ko...done.
Loaded symbols for /boot/kernel/acpi.ko
Reading symbols from /boot/kernel/blank_saver.ko...done.
Loaded symbols for /boot/kernel/blank_saver.ko
Reading symbols from /boot/kernel/linux.ko...done.
Loaded symbols for /boot/kernel/linux.ko
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:238
238             dumping++;
(kgdb) where
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:238
#1  0xc030f735 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:370
#2  0xc030fa6a in panic () at /usr/src/sys/kern/kern_shutdown.c:543
#3  0xc0351b62 in bremfreel (bp=0xd2269c00) at 
/usr/src/sys/kern/vfs_bio.c:648
#4  0xc0351a45 in bremfree (bp=0x0) at /usr/src/sys/kern/vfs_bio.c:630
#5  0xc0354eb8 in getblk (vp=0xc5c3a000, blkno=42509792, size=16384,
     slpflag=0, slptimeo=0, flags=0) at /usr/src/sys/kern/vfs_bio.c:2442
#6  0xc0351c32 in breadn (vp=0xc5c3a000, blkno=0, size=0, rablkno=0x0,
     rabsize=0x0, cnt=0, cred=0x0, bpp=0x0) at 
/usr/src/sys/kern/vfs_bio.c:701
#7  0xc0351bdc in bread (vp=0x0, blkno=0, size=0, cred=0x0, bpp=0x0)
     at /usr/src/sys/kern/vfs_bio.c:683
#8  0xc041b143 in ffs_update (vp=0xc60b1920, waitfor=0)
     at /usr/src/sys/ufs/ffs/ffs_inode.c:102
#9  0xc042f933 in ffs_fsync (ap=0xde73eaf4)
     at /usr/src/sys/ufs/ffs/ffs_vnops.c:316
#10 0xc042ea1e in ffs_sync (mp=0xc5af1600, waitfor=2, cred=0xc1b5ee80,
     td=0xc0585140) at vnode_if.h:612
#11 0xc0366be4 in sync (td=0xc0585140, uap=0x0)
     at /usr/src/sys/kern/vfs_syscalls.c:137
#12 0xc030f2a3 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:279
#13 0xc030fa6a in panic () at /usr/src/sys/kern/kern_shutdown.c:543
#14 0xc041700a in ffs_blkfree (fs=0xc5aeb800, devvp=0xc5c3a000, 
bno=10638104,
     size=16384, inum=2661386) at /usr/src/sys/ufs/ffs/ffs_alloc.c:1768
#15 0xc0424eb3 in handle_workitem_freefrag (freefrag=0xc5c8a880)
     at /usr/src/sys/ufs/ffs/ffs_softdep.c:1587
#16 0xc0423bf5 in process_worklist_item (matchmnt=0x0, flags=0)
     at /usr/src/sys/ufs/ffs/ffs_softdep.c:767
#17 0xc04238f0 in softdep_process_worklist (matchmnt=0x0)
     at /usr/src/sys/ufs/ffs/ffs_softdep.c:622
#18 0xc0363464 in sched_sync () at /usr/src/sys/kern/vfs_subr.c:1757
#19 0xc02fb5f0 in fork_exit (callout=0xc0363180 <sched_sync>, arg=0x0,
     frame=0x0) at /usr/src/sys/kern/kern_fork.c:795

-Andreas