syzbot

panic: trap type 4, code=0, pc=ffffffff815d285a
Starting stack trace...

panic(ffffffff8271ff4a) at panic+0x155 sys/kern/subr_prf.c:229
kerntrap(ffff80002e9214f0) at kerntrap+0x1b7 sys/arch/amd64/amd64/trap.c:334
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
ktrops(ffff8000216de2e0,dead4110dead4110,0,8000030a,fffffd806449d640,fffffd807f7d78f0) at ktrops+0x4a ktrcanset sys/kern/kern_ktrace.c:696 [inline]
ktrops(ffff8000216de2e0,dead4110dead4110,0,8000030a,fffffd806449d640,fffffd807f7d78f0) at ktrops+0x4a sys/kern/kern_ktrace.c:541
doktrace(fffffd806449d640,4,30a,0,ffff8000216de2e0) at doktrace+0x514 ktrsetchildren sys/kern/kern_ktrace.c:566 [inline]
doktrace(fffffd806449d640,4,30a,0,ffff8000216de2e0) at doktrace+0x514 sys/kern/kern_ktrace.c:488
sys_ktrace(ffff8000216de2e0,ffff80002e921838,ffff80002e921880) at sys_ktrace+0xd2 sys/kern/kern_ktrace.c:529
syscall(ffff80002e921900) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x817290026a0, count: 249
End of stack trace.
syncing disks...18 10  done

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 a0530fd3-c3ad-b54d-95aa-ef4c7d9dfdbd
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 0x000f27d0: 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 3.55
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