panic: kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/main/kernel/sys/netinet/if_ether.c", line 758
Starting stack trace...
panic(ffffffff8277d63e) at panic+0x159 sys/kern/subr_prf.c:229
__assert(ffffffff827fcc0f,ffffffff82823774,2f6,ffffffff8274d995) at __assert+0x29 sys/kern/subr_prf.c:157
arptfree(fffffd8063770558) at arptfree+0x131 sys/netinet/if_ether.c:758
arptimer(ffffffff82d353a8) at arptimer+0x88 sys/netinet/if_ether.c:135
timeout_run(ffffffff82d353a8) at timeout_run+0x8f sys/kern/kern_timeout.c:640
softclock_thread(ffff8000215ea298) at softclock_thread+0xd4 sys/kern/kern_timeout.c:763
end trace frame: 0x0, count: 251
End of stack trace.
syncing disks...21 19  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 d662f6a5-d763-0b53-7cd8-e4e6b0001699
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 0x000f28a0: 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 3.65
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