panic: kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet/if_ether.c", line 758
Starting stack trace...
panic(ffffffff827a5490) at panic+0x16f sys/kern/subr_prf.c:229
__assert(ffffffff82827587,ffffffff82823e9d,2f6,ffffffff82776716) at __assert+0x29 sys/kern/subr_prf.c:157
arptfree(fffffd8068e35ef0) at arptfree+0x132 sys/netinet/if_ether.c:758
arptimer(ffffffff82c9a6a0) at arptimer+0x88 sys/netinet/if_ether.c:135
timeout_run(ffffffff82c9a6a0) at timeout_run+0xd0 sys/kern/kern_timeout.c:665
softclock_thread(ffff800021168ff0) at softclock_thread+0x114 sys/kern/kern_timeout.c:809
end trace frame: 0x0, count: 251
End of stack trace.
syncing disks...25 20 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1  giving up

dump to dev 4,1 not possible
repabnoioc:t inkergn.e.l. 
diagnosticSeaBIOS (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 f8e08a03-81bc-3227-53c0-939594373760
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 0x000f2890: 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> show malloc
boot: illegal argument malloc
boot> show all pools
boot> machine ddbcpu 0
machine: syntax error
boot> trace
boot> machine ddbcpu 1
machine: syntax error
boot> trace