VirtualBox 5.0.30 on CentOS6.8: use nyftp iso image:
NetBSD 7.99.42 GENERIC.201611131540Z ... boot fine. dmesg: https://github.com/ebijun/NetBSD/blob/master/dmesg/i386/VirtualBox NetBSD 7.99.42 GENERIC.201611271450Z: ... stucked. NetBSD 7.99.43 GENERIC.201611291610Z: ... stucked. kernel: supervisor trap page fault, code=0 uvm_fault(0xc12bc400,0xc153000,1) -> 0xe fatal page fault in supervisor mode trap type 6 code 0 eip c0153468 cs 8 eflags 10282 cr2 c153300 ilevel 8 esp c0f41cfd curlwp 0xc1228720 pid 0 lid 1 lowest kstack 0xc14c92c0 kernel: supervisor trap page fault, code=0 : and stucked. -- Jun Ebihara