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lock order reversal:
1st 0xc1a018f0 vnode interlock (vnode interlock) @ sys/kern/vfs_subr.c:2449
2nd 0xc0c43144 system map (system map) @ sys/vm/vm_kern.c:295
KDB: stack backtrace:
kdb_backtrace(0,ffffffff,c06676b0,c0667700,c0636024) at 0xc049d3c9 = kdb_backtrace+0x29
witness_checkorder(c0c43144,9,c061fe28,127) at 0xc04a80c2 = witness_checkorder+0x582
_mtx_lock_flags(c0c43144,0,c061fe28,127) at 0xc047b998 = _mtx_lock_flags+0x58
_vm_map_lock(c0c430c0,c061fe28,127) at 0xc059eb46 = _vm_map_lock+0x26
kmem_malloc(c0c430c0,1000,101,c819fbe0,c059679f) at 0xc059e0d2 = kmem_malloc+0x32
page_alloc(c0c4d300,1000,c819fbd3,101,c06a3bf8) at 0xc0596bda = page_alloc+0x1a
slab_zalloc(c0c4d300,101,c0c4d300,c0647a64,c0c4e460) at 0xc059679f = slab_zalloc+0x9f
uma_zone_slab(c0c4d300,1,c0c4e468,0,c061f05a,8a2) at 0xc0597dec = uma_zone_slab+0xec
uma_zalloc_internal(c0c4d300,0,1,0,c0c4dc48) at 0xc0598129 = uma_zalloc_internal+0x29
bucket_alloc(80,1,c0c380a0,0,c19ab6a4) at 0xc0595eac = bucket_alloc+0x2c
uma_zfree_arg(c0c4dc00,c19ab6a4,0) at 0xc0598483 = uma_zfree_arg+0x283
mac_labelzone_free(c19ab6a4,c1a01828,e8,c819fc9c,c0565ad2) at 0xc055dab3 = mac_labelzone_free+0x13
mac_vnode_label_free(c19ab6a4,c1a01828,c819fcac,c04d8766,c1a01828) at 0xc0565aaa = mac_vnode_label_free+0x6a
mac_destroy_vnode(c1a01828) at 0xc0565ad2 = mac_destroy_vnode+0x12
vdestroy(c1a01828,c1a01828,c819fcec,c04d8142,c1a01828) at 0xc04d8766 = vdestroy+0x1c6
vdropl(c1a01828,7,a8,c0653ee0,c1a01828) at 0xc04dad1e = vdropl+0x3e
vlrureclaim(c15e8000,c1529000,c156f000,c04d8360,c156f000) at 0xc04d8142 = vlrureclaim+0x282
vnlru_proc(0,c819fd38,0,c04d8360,0) at 0xc04d84e3 = vnlru_proc+0x183
fork_exit(c04d8360,0,c819fd38) at 0xc046de7d = fork_exit+0x9d
fork_trampoline() at 0xc05d33bc = fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xc819fd6c, ebp = 0 ---
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