syzbot

uvm_fault(0xfffffd800e148188, 0x0, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff81c8532d cs 8 rflags 10202 cr2 0 cpl 0 rsp ffff80002a8a1480
gsbase 0xffffffff83906ff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff81c8532d
Starting stack trace...
panic(ffffffff83447f6f) at panic+0x1ba sys/kern/subr_prf.c:229
kerntrap(ffff80002a8a13d0) at kerntrap+0x2fb
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
VOP_LOCK(fffffd806cb1c0d8,2001) at VOP_LOCK+0x9d sys/kern/vfs_vops.c:524
vn_lock(fffffd806cb1c0d8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vn_write(fffffd806cce1878,ffff80002a8a1678,0) at vn_write+0x17e sys/kern/vfs_vnops.c:405
dofilewritev(ffff8000308c07e0,c8,ffff80002a8a1678,0,ffff80002a8a1720) at dofilewritev+0x2bd sys/kern/sys_generic.c:384
sys_write(ffff8000308c07e0,ffff80002a8a17d0,ffff80002a8a1720) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002a8a17d0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a8a17d0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xbc909114170, count: 247
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 016acda6-80d9-6675-f1e2-930bbf0c87d3
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 0x000f26c0: 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