# baseline (unpatched kernel #0 Jul 2 2026), f2_width.img (RAID0 width=64 total_disks=1) on ata0-master
ar0: 48MB <FreeBSD PseudoRAID RAID0 (stripe 0 KB)> status: READY
ar0: disk0 READY using ad0 at ata0-master
ar0: MBR magic not found; assume a COMPATIBILITY_SLICE (s0)

Fatal trap 12: page fault while in kernel mode
cpuid = 2; lapic id = 2
fault virtual address	= 0x80
fault code		= supervisor read data, page not present
instruction pointer	= 0x8:0xffffffff8068cc00
current process		= Idle
kernel: type 12 trap, code=0
Stopped at      device_get_softc:       movq    0x80(%rdi),%rax
# %rdi = request->dev = rdp->disks[drv].dev read OOB (zeroed heap -> NULL);
# drv = (blkno/interleave) % width = blkno % 64 >= 16  (ata-raid.c:360,400-410)
# guest wedged in DDB; boot never completed