panic: rele: negative ref count

Just got this on a 7-beta4 machine when i did a reboot:

..
Dec 30 15:55:34 back-1 reboot: rebooted by johan
Dec 30 15:55:34 back-1 syslogd: exiting on signal 15
panic: vrele: negative ref count
cpuid = 0
Uptime: 14d23h
Physical Memory: 2024Mb
Dumping 1591 MB: ........
Dump complete
Automatic reboot...balba

On next boot:

Checking for core dump on /dev/mirror/gm1b...
savecore: first and last dump headers disagree on /dev/mirror/gm1b
savecore: unsaved dumps found but not saved
Dec 30 15:57:51 back-1 savecore: first and last dump headers disagree on /dev/mirror/gm1b

with savecore -f i managed to dump a vmcore.0..

back-1 /var/crash$ kgdb /boot/kernel.old/kernel vmcore.0
kgdb: kvm_read: invalid address (0x406a00)
[GDB will not be able to debug user-mode threads: /usr/lib/ libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 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 "amd64-marcel-freebsd".
Cannot access memory at address 0xffffffff80a7cd70
(kgdb) where
#0 0x0000000000000000 in ?? ()
Cannot access memory at address 0x0

Not very usefull..? Yes kernel.old since I just rebuilt with -RC1, hence the reboot.


Clues?
--
Johan Ström
Stromnet
johan@xxxxxxxxxxx
http://www.stromnet.se/


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