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From: Christopher Johnson <cjohnson-freebsd@wcug.wwu.edu>
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lock order reversal
 1st 0xc67aa490 vnode interlock (vnode interlock) @ /usr/src/sys/ufs/ffs/ffs_sna
pshot.c:651
 2nd 0xc102f110 system map (system map) @ /usr/src/sys/vm/vm_map.c:2258
Stack backtrace:
backtrace(c07feb63,c102f110,c080cef8,c080cef8,c080cf6e) at backtrace+0x17
witness_lock(c102f110,8,c080cf6e,8d2,c07fe956) at witness_lock+0x672
_mtx_lock_flags(c102f110,0,c080cf6e,8d2,c08998c0) at _mtx_lock_flags+0xba
_vm_map_lock(c102f0b0,c080cf6e,8d2,c688abf4,0) at _vm_map_lock+0x36
vm_map_remove(c102f0b0,c6b8a000,c6b8d000,e71cd7e0,c075527b) at vm_map_remove+0x3
0
kmem_free(c102f0b0,c6b8a000,3000,e71cd800,c0756eba) at kmem_free+0x32
page_free(c6b8a000,3000,22,c678bd7c,c6b84000) at page_free+0x3b
uma_large_free(c688abf4,c062811a,c67aa490,8,3000) at uma_large_free+0x10a
free(c6b8a000,c0861180,c0809d49,28b,c2685e80) at free+0xf1
ffs_snapshot(c6711000,80c9f20,70,c0892030,6957b0d2) at ffs_snapshot+0x23de
ffs_mount(c6711000,c687a800,bfbffcc0,e71cdbec,c678bd10) at ffs_mount+0x628
vfs_mount(c678bd10,c67206c0,c687a800,1211000,bfbffcc0) at vfs_mount+0x7d1
mount(c678bd10,e71cdd10,c081315d,3f0,4) at mount+0xb8
syscall(2f,2f,2f,0,bfbffdc0) at syscall+0x2c0
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (21), eip = 0x8056203, esp = 0xbfbffb6c, ebp = 0xbfbffd48 ---

Chris Johnson
cjohnson-freebsd@wcug.wwu.edu
Cave canem.