I've upgraded my Krups (64MB RAM, diskless) to 9.99.75 as of Nov 6 and the machine is locking up at boot time in rc.d/fccache. If I disable fccache in rc.conf it boots but then eventually locks up when makemandb is run. The machine doesn't respond to pings, etc, but can enter ddb. In all cases the ddb stacktrace goes through:
... uvm_fault_internal mem_access_fault4m memfault_sun4m copyout with the top part of the stack trace varying. -uwe
