FreeBSD lock order reversal (LOR) #278

lock order reversal:
 1st 0xc696ae44 user map (user map) @ sys/vm/vm_map.c:3115
 2nd 0xc6ed0270 isofs (isofs) @ sys/kern/vfs_subr.c:2079
		
KDB: stack backtrace:
db_trace_self_wrapper(...) at db_trace_self_wrapper+0x26
kdb_backtrace(...) at kdb_backtrace+0x29
_witness_debugger(...) at _witness_debugger+0x25
witness_checkorder(...) at witness_checkorder+0x839
__lockmgr_args(...) at __lockmgr_args+0x797
vop_stdlock(...) at vop_stdlock+0x62
VOP_LOCK1_APV(...) at VOP_LOCK1_APV+0xa5
_vn_lock(...) at _vn_lock+0x5e
vget(...) at vget+0xc9
vnode_pager_lock(...) at vnode_pager_lock+0x1e0
vm_fault(...) at vm_fault+0x1df
trap_pfault(...) at trap_pfault+0x118
trap(...) at trap+0x289
calltrap(...) at calltrap+0x6
		

• freebsd-current (thread)