backtrace

	Hello,

I got this in my logs:

lock order reversal
 1st 0xc45b9ad4 vm object (vm object) _at_ /usr/src/sys/vm/swap_pager.c:1313
 2nd 0xc06a96a0 swap_pager swhash (swap_pager swhash) _at_ /usr/src/sys/vm/swap_pager.c:1799
 3rd 0xc103fb58 vm object (vm object) _at_ /usr/src/sys/vm/uma_core.c:886
Stack backtrace:
backtrace(c06181ea,c103fb58,c0626b38,c0626b38,c0627aaa) at backtrace+0x17
witness_checkorder(c103fb58,9,c0627aaa,376,c067e2c0) at witness_checkorder+0x6f6
_mtx_lock_flags(c103fb58,0,c0627aaa,376,c0613d39) at _mtx_lock_flags+0x9a
obj_alloc(c4517240,1000,dfed9a07,101,c06a2678) at obj_alloc+0x3f
slab_zalloc(c4517240,1,c0627aaa,68f,c4517254) at slab_zalloc+0xb1
uma_zone_slab(c4517240,1,c0627aaa,68f,c45172e0) at uma_zone_slab+0xcf
uma_zalloc_internal(c4517240,0,1,5c4,c45b9ad4) at uma_zalloc_internal+0x3e
uma_zalloc_arg(c4517240,0,1,707,2) at uma_zalloc_arg+0x3bb
swp_pager_meta_build(c45b9ad4,12,0,2,0) at swp_pager_meta_build+0x154
swap_pager_putpages(c45b9ad4,dfed9bd0,1,0,dfed9b40) at swap_pager_putpages+0x32d
default_pager_putpages(c45b9ad4,dfed9bd0,1,0,dfed9b40) at default_pager_putpages+0x2e
vm_pageout_flush(dfed9bd0,1,0,eb,c06a2640) at vm_pageout_flush+0x182
vm_pageout_clean(c168b7a8,0,c0627894,33b,0) at vm_pageout_clean+0x2f5
vm_pageout_scan(0,0,c0627894,5b7,1388) at vm_pageout_scan+0x677
vm_pageout(0,dfed9d48,c061227a,328,0) at vm_pageout+0x318
fork_exit(c05be110,0,dfed9d48) at fork_exit+0xd5
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xdfed9d7c, ebp = 0 ---

Here is my dmesg: http://cs.ubbcluj.ro/~dan/dmesg.txt

Can somebody explain me what is wrong here?
	Thanks,
				Dan
Ps. Please CC me if you need more details.