panic: trap type 6, code=10, pc=0
Starting stack trace...
panic(ffffffff82fdd804) at panic+0x1d0 sys/kern/subr_prf.c:229
kerntrap(ffff80002a06a150) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
0(fffffd805eb4df00,fffffd805eb4df00,0,fffffd805eb4df00,281,0) at 0
softclock_process_kclock_timeout(fffffd805eb4df00,0) at softclock_process_kclock_timeout+0x2a2 sys/kern/kern_timeout.c:693
softclock(0) at softclock+0x199 sys/kern/kern_timeout.c:746
softintr_dispatch(0) at softintr_dispatch+0xf6 sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x27
scsi_xs_exec(fffffd805741d040) at scsi_xs_exec+0x5d sys/scsi/scsi_base.c:1457
sdstart(fffffd805741d040) at sdstart+0x4b2 sys/scsi/sd.c:709
scsi_iopool_run(ffff8000000a3048) at scsi_iopool_run+0x181 sys/scsi/scsi_base.c:423
scsi_xsh_runqueue(ffff80000002c500) at scsi_xsh_runqueue+0x39d sys/scsi/scsi_base.c:599
scsi_xsh_add(ffff80000019f1e0) at scsi_xsh_add+0x115 sys/scsi/scsi_base.c:538
sdstrategy(fffffd80762d57b8) at sdstrategy+0x21b sys/scsi/sd.c:567
spec_strategy(ffff80002a06a5f8) at spec_strategy+0x45 sys/kern/spec_vnops.c:448
VOP_STRATEGY(fffffd807e829000,fffffd80762d57b8) at VOP_STRATEGY+0xcc sys/kern/vfs_vops.c:634
bwrite(fffffd80762d57b8) at bwrite+0x293 sys/kern/vfs_bio.c:757
ffs_update(fffffd806e153228,1) at ffs_update+0x34c sys/ufs/ffs/ffs_inode.c:111
VOP_FSYNC(fffffd806df0da70,fffffd807f7d3888,1,ffff8000ffffd960) at VOP_FSYNC+0x108 sys/kern/vfs_vops.c:311
sys_fsync(ffff8000ffffd960,ffff80002a06a8c0,ffff80002a06a810) at sys_fsync+0x16f sys/kern/vfs_syscalls.c:2926
syscall(ffff80002a06a8c0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff80002a06a8c0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f2689fcd450, count: 235
End of stack trace.

dump to dev 4,1 not possible
rebooting...
SeaBIOS (version 1.8.2-google)
Total RAM Size = 0x0000000080000000 = 2048 MiB
CPUs found: 2     Max CPUs supported: 2
SeaBIOS (version 1.8.2-google)
Machine UUID 389fa873-dfcb-7256-506e-5266d86d0b3b
found virtio-scsi at 0:3
virtio-scsi vendor='Google' product='PersistentDisk' rev='1' type=0 removable=0
virtio-scsi blksize=512 sectors=4194304 = 2048 MiB
drive 0x000f27c0: PCHS=0/0/0 translation=lba LCHS=520/128/63 s=4194304
Sending Seabios boot VM event.
Booting from Hard Disk 0...
>> OpenBSD/amd64 BOOT 3.67
boot> set $lines = 0
set: syntax error
boot> set $maxwidth = 0
set: syntax error
boot> show panic
boot: illegal argument panic
boot> trace
boot> show registers
boot> show proc
boot> ps
boot> show all locks
boot> show malloc
boot> show all pools
boot> machine ddbcpu 0
machine: syntax error
boot> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace