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FreeBSD lock order reversal (LOR) #6

ID 6
state unknown
responsible
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LOR
lock order reversal
 1st 0xc63b811c vnode interlock (vnode interlock) @ sys/ufs/ffs/ffs_snapshot.c:1893
 2nd 0xc1039118 system map (system map) @ sys/vm/vm_map.c:2206
		
Stack backtrace:
backtrace(0,ffffffff,c0708c10,c0709ac0,c0608320) at backtrace+0x12
witness_checkorder(c1039118,9,c05eed2c,89e) at witness_checkorder+0x593
_mtx_lock_flags(c1039118,0,c05eed2c,89e) at _mtx_lock_flags+0x68
_vm_map_lock(c10390b8,c05eed2c,89e) at _vm_map_lock+0x21
vm_map_remove(c10390b8,c6727000,c6729000,e72b29ec,c0572341) at vm_map_remove+0x1f
kmem_free(c10390b8,c6727000,2000,e72b2a04,c05738b7) at kmem_free+0x25
page_free(c6727000,2000,22,c0616380,e72b2a28) at page_free+0x31
uma_large_free(c63d3f54) at uma_large_free+0x7b
free(c6727000,c0616380,c66e1100,a,c636d000) at free+0xfc
ffs_snapshot_unmount(c636d000) at ffs_snapshot_unmount+0xe7
ffs_flushfiles(c636d000,4,c666cbd0) at ffs_flushfiles+0x3b
softdep_flushfiles(c636d000,4,c666cbd0,c636fb00,0) at softdep_flushfiles+0x1e
ffs_mount(c636d000,c669a900,bfbfdf90,e72b2bf4,c666cbd0) at ffs_mount+0x1c7
vfs_domount(c666cbd0,c61c6c60,c669a900,10001,bfbfdf90) at vfs_domount+0x6e6
mount(c666cbd0,e72b2d14,4,0,202) at mount+0x6c
syscall(2f,2f,2f,bfbfdf8c,2) at syscall+0x217
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (21), eip = 0x280c0f4f, esp = 0xbfbfdf6c, ebp = 0xbfbfe018 ---
		
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