(yet a) LOR on 5.1-BETA

I do not remember if this has been reported before.

While closing down X/KDE I got the LOR attached below.

Cheers,
Nicolai Petri

----------------------------------------
lock order reversal
 1st 0xc2b96ed8 vm object (vm object) _at_ /usr/src/sys/vm/vm_object.c:512
 2nd 0xc082f110 system map (system map) _at_ /usr/src/sys/vm/vm_kern.c:325
Stack backtrace:
backtrace(c033f51d,c082f110,c034c356,c034c356,c034c1ed) at backtrace+0x17
witness_lock(c082f110,8,c034c1ed,145,0) at witness_lock+0x697
_mtx_lock_flags(c082f110,0,c034c1ed,145,3) at _mtx_lock_flags+0xb1
_vm_map_lock(c082f0b0,c034c1ed,145,ce679a58,c01f6374) at _vm_map_lock+0x36
kmem_malloc(c082f0b0,1000,101,ce679ac4,c02d0cf0) at kmem_malloc+0x66
page_alloc(c083a240,1000,ce679ab7,101,c03692ac) at page_alloc+0x27
slab_zalloc(c083a240,101,c034dbba,66f,c269d384) at slab_zalloc+0x150
uma_zone_slab(c083a240,101,c034dbba,66f,0) at uma_zone_slab+0xd8
uma_zalloc_internal(c083a240,0,101,6ef,0) at uma_zalloc_internal+0x55
uma_zfree_arg(c269d360,cdd8a228,0,1,0) at uma_zfree_arg+0x2cb
swp_pager_meta_free_all(c2b96ed8,c034bbe2,c034bb76,1af) at 
swp_pager_meta_free_all+0x1b0
swap_pager_dealloc(c2b96ed8,1,c034dabd,10b,0) at swap_pager_dealloc+0x113
vm_pager_deallocate(c2b96ed8,0,c034cc93,25e,c0399e48) at 
vm_pager_deallocate+0x3d
vm_object_terminate(c2b96ed8,0,c034cc93,200,c2ab6bf4) at 
vm_object_terminate+0x1f4
vm_object_deallocate(c2b96ed8,c2ab6bf4,c2b96ed8,c2ab6bf4,ce679c64) at 
vm_object_deallocate+0x217
vm_map_entry_delete(c284d100,c2ab6bf4,c034c3c4,86e,c033ae4e) at 
vm_map_entry_delete+0x3b
vm_map_delete(c284d100,0,bfc00000,c284d100,c2634780) at vm_map_delete+0x453
vm_map_remove(c284d100,0,bfc00000,111,c033a45e) at vm_map_remove+0x58
exit1(c27e7980,100,c033a45e,63,ce679d40) at exit1+0x626
sys_exit(c27e7980,ce679d10,c03517a4,3fb,1) at sys_exit+0x41
syscall(bfbf002f,bfbf002f,bfbf002f,0,e34) at syscall+0x26e
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (1), eip = 0x290516cf, esp = 0xbfbfef6c, ebp = 0xbfbfef98 ---