vfs panic on port-amd64

[Paul Goyette <paul%whooppee.com@localhost>]

Starting with sources checked out on 2014-05-24 at 19:35:11 UTC my amd64 
atf test-bed is reporting the following panic:

sbin/resize_ffs/t_grow (376/589): 4 test cases
    grow_16M_v0_8192: Mutex error: mutex_vector_enter: locking against myself

lock address : 0xfffffe800408a800
current cpu  :                  0
current lwp  : 0xfffffe800d9ec9e0
owner field  : 0xfffffe800d9ec9e0 wait/spin:                0/0

panic: lock error
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
snprintf() at netbsd:snprintf
lockdebug_abort() at netbsd:lockdebug_abort+0x3a
mutex_vector_enter() at netbsd:mutex_vector_enter+0x4aa
pageflush_selector() at netbsd:pageflush_selector+0x12
vfs_vnode_iterator_next() at netbsd:vfs_vnode_iterator_next+0x98
puffs_vfsop_sync() at netbsd:puffs_vfsop_sync+0x4e
VFS_SYNC() at netbsd:VFS_SYNC+0x1c
do_sys_sync() at netbsd:do_sys_sync+0xb3
sys_sync() at netbsd:sys_sync+0x9
syscall() at netbsd:syscall+0x9a
--- syscall (number 36) ---
7f7ff743bbca:
cpu0: End traceback...

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