I tried -currents built ~8 and ~2 days ago.  They fall into ddb after some time:

db{1}> bt
uvm_fault(0xcf9742a8, 0, 0, 1) -> 0xe
kernel: page fault trap, code=0
Faulted in DDB; continuing...

db{1}> continue
uvm_fault(0xc05b6220, 0xcb8a5000, 0, 2) -> 0xe
kernel: page fault trap, code=0
Stopped in pid 5030.1 (sox) at  netbsd:memset+0x26:     movl    %eax,0xfffffffc(
%edi,%ecx,1)


It is SMP i386 machine, do not know if it matters.