It did not crash or anything, but the following is printed on
console now (addresses ommitted):

        lock order reversal
         1st ... UMA lock (UMA lock) @ /usr/src/sys/vm/uma_core.c:1201
         2nd ... system map (system map) @ /usr/src/sys/vm/vm_map.c:2210
        Stack backtrace:
        backtrace(....) at backtrace+0x17
        witness_lock(....) at wintess_lock+0x672
        _mtx_lock_flags(....) at _mtx_lock_flags+0xba
        _vm_map_lock(....) at _vm_map_lock+0x36
        vm_map_remove(....) at vm_map_remove+0x30
        kmem_free(....) at kmem_free+0x32
        page_free(....) at page_free+0x3b
        zone_drain(....) at zone_drain+0x2cf
        zone_foreach(....) at zone_foreach+0x45
        uma_reclaim(....) at uma_reclaim+0x17
        vm_pageout_scan(....) at vm_pageout_scan+0x148
        vm_pageout(....) at vm_pageout+0x31b
        fork_exit(....) at fork_exit+0xb4
        fork_trampoline(....) at fork_trampoline+0x8
        --- trap 0x1, eip = 0, esp = ....., ebp = 0 ---

Hope, this is usefull. A new kernel -- from today's sources -- is being
compiled now.

        -mi
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