assertion panic (object->flags & OBJ_CHAINLOCK) == 0

[Jan Lentfer]

My system paniced this morning due to an assertion. What's this about? 
Anything I should do About it?

Jan

Dec 18 06:19:59 epia syslogd: kernel boot file is /boot/kernel/kernel
Dec 18 06:19:59 epia kernel: panic: assertion "(object->flags & 
OBJ_CHAINLOCK) == 0" failed in vm_object_reference_locked at 
/home/lentferj/repo/src/sys/vm/vm_object.c:517
Dec 18 06:19:59 epia kernel: cpuid = 0
Dec 18 06:19:59 epia kernel: Trace beginning at frame 0xd8bfbc10
Dec 18 06:19:59 epia kernel: 
panic(ffffffff,0,c06c9194,d8bfbc44,cc32b160) at panic+0x19e 0xc0373313
Dec 18 06:19:59 epia kernel: 
panic(c06c9194,c070fc88,c067b7ce,c070fb88,205) at panic+0x19e 0xc0373313
Dec 18 06:19:59 epia kernel: 
vm_object_reference_locked(d1e8e690,cd960060,100,c078c440,bfbff89c) at 
vm_object_reference_locked+0x97 0xc0580593
Dec 18 06:19:59 epia kernel: sys_shmat(d8bfbcf0,d8bfbd00,c,0,0) at 
sys_shmat+0x1f7 0xc03aa204
Dec 18 06:19:59 epia kernel: syscall2(d8bfbd40) at syscall2+0x26e 0xc0642c31
Dec 18 06:19:59 epia kernel: Xint0x80_syscall() at Xint0x80_syscall+0x36 
0xc061ac76
Dec 18 06:19:59 epia kernel: Uptime: 6d16h16m12s
Dec 18 06:19:59 epia kernel: Copyright (c) 2003-2011 The DragonFly Project.
Dec 18 06:19:59 epia kernel: Copyright (c) 1992-2003 The FreeBSD Project.
Dec 18 06:19:59 epia kernel: Copyright (c) 1979, 1980, 1983, 1986, 1988, 
1989, 1991, 1992, 1993, 1994
Dec 18 06:19:59 epia kernel: The Regents of the University of 
California. All rights reserved.
Dec 18 06:19:59 epia kernel: madt_probe: can't locate MADT

DragonFly epia.lan.net 2.13-DEVELOPMENT DragonFly 
v2.13.0.527.g95bf5-DEVELOPMENT #19: Sun Dec 11 08:58:12 CET 2011     
lentferj at df386devel.lan.net:/usr/obj/home/lentferj/repo/src/sys/GENERIC  
i386