In vnode_if.c:VOP_READDIR(), some ifdef(VNODE_LOCKDEBUG) code
is trying to verify that the vnode is locked with LK_EXCLUSIVE,
but vfs_vnops.c:vn_readdir() is locking it LK_SHARED, leading to:

panic: vop_readdir: vp: locked 0, expected 1
Stopped in pid 677.1 (ls) at    netbsd:cpu_Debugger+0x5:        leave   
db{1}> cpu_Debugger() at netbsd:cpu_Debugger+0x5
panic() at netbsd:panic+0x1fc
VOP_READDIR() at netbsd:VOP_READDIR+0x9f
vn_readdir() at netbsd:vn_readdir+0xf7
sys___getdents30() at netbsd:sys___getdents30+0xef
syscall_plain() at netbsd:syscall_plain+0x1cf
uvm_fault(0xffff80004e667db0, 0x0, 1) -> e
kernel: page fault trap, code=0

   Is this a real problem or just an overzealous test? I would
think a shared lock would be good enough, but I wanted to be sure
before moving on with my debugging.

   Thanks.

					Gary Duzan