1st 0xc628d210 vm object (vm object) @ /usr/src/sys/vm/swap_pager.c:1323
 2nd 0xc098cf60 swap_pager swhash (swap_pager swhash) @ /usr/src/sys/vm/swap_pag
er.c:1838
 3rd 0xc1038738 vm object (vm object) @ /usr/src/sys/vm/uma_core.c:876
Stack backtrace:
backtrace(c089b8b5,c1038738,c08afa80,c08afa80,c08b0961) at backtrace+0x17
witness_lock(c1038738,8,c08b0961,36c,c4a03540) at witness_lock+0x672
_mtx_lock_flags(c1038738,0,c08b0961,36c,c4a03554) at _mtx_lock_flags+0xba
obj_alloc(c4a03540,1000,d8a10a03,101,c095b220) at obj_alloc+0x3f
slab_zalloc(c4a03540,1,8,c08b0961,68c) at slab_zalloc+0xb3
uma_zone_slab(c4a03540,1,c08b0961,68c,c4a035e0) at uma_zone_slab+0xd6
uma_zalloc_internal(c4a03540,0,1,5c1,c08ae87a,72e) at uma_zalloc_internal+0x3e
uma_zalloc_arg(c4a03540,0,1,72e,2) at uma_zalloc_arg+0x3ab
swp_pager_meta_build(c628d210,38,0,2,0) at swp_pager_meta_build+0x174
swap_pager_putpages(c628d210,d8a10bd0,1,0,d8a10b40) at swap_pager_putpages+0x32d
 
default_pager_putpages(c628d210,d8a10bd0,1,0,d8a10b40) at default_pager_putpages
+0x2e
vm_pageout_flush(d8a10bd0,1,0,eb,3e8) at vm_pageout_flush+0x17a
vm_pageout_clean(c16c96d8,0,c08b077c,32a,0) at vm_pageout_clean+0x305
vm_pageout_scan(0,0,c08b077c,5a9,1f4) at vm_pageout_scan+0x64c
vm_pageout(0,d8a10d48,c0895fd8,311,c7000000) at vm_pageout+0x31b
fork_exit(c07e7e60,0,d8a10d48) at fork_exit+0xb4
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xd8a10d7c, ebp = 0 ---