syzbot

panic: trap type 4, code=0, pc=ffffffff81286f3c
Starting stack trace...
panic(ffffffff82850168) at panic+0x16f sys/kern/subr_prf.c:229
kerntrap(ffff800037402280) at kerntrap+0x1d7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
solock_shared(ffff800000facd10) at solock_shared+0x1c sys/kern/uipc_socket2.c:351
soreceive(ffff800000facd10,0,ffff800037402588,0,0,ffff80003740249c,680120796035de28) at soreceive+0x690 sys/kern/uipc_socket.c:932
fifo_read(ffff8000374024f0) at fifo_read+0xd2 sys/miscfs/fifofs/fifo_vnops.c:256
VOP_READ(fffffd8057f74980,ffff800037402588,64,fffffd807f7d74e0) at VOP_READ+0xc3 sys/kern/vfs_vops.c:227
vn_rdwr(0,fffffd8057f74980,ffff800013b92000,200,0,1,87dd081327657111,0,ffff8000006aa000,0) at vn_rdwr+0x10a
vndstrategy(fffffd80720d5590) at vndstrategy+0x3e2 sys/dev/vnd.c:342
readdoslabel(fffffd80720d5590,ffffffff820721b0,ffff800000df7e00,0,0) at readdoslabel+0x79 readdisksector sys/kern/subr_disk.c:323 [inline]
readdoslabel(fffffd80720d5590,ffffffff820721b0,ffff800000df7e00,0,0) at readdoslabel+0x79 sys/kern/subr_disk.c:354
readdisklabel(2902,ffffffff820721b0,ffff800000df7e00,0) at readdisklabel+0x16b sys/arch/amd64/amd64/disksubr.c:99
vndioctl(2902,20006473,ffff800037403390,1,ffff8000fffeea70) at vndioctl+0x48b sys/dev/vnd.c:612
VOP_IOCTL(fffffd806eb9c3c0,20006473,ffff800037403390,1,fffffd807f7d73a8,ffff8000fffeea70) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806791ada8,20006473,ffff800037403390,ffff8000fffeea70) at vn_ioctl+0xc0 sys/kern/vfs_vnops.c:525
sys_ioctl(ffff8000fffeea70,ffff800037403570,ffff8000374034c0) at sys_ioctl+0x4a9
syscall(ffff800037403570) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline]
syscall(ffff800037403570) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x88e9b7b4c40, count: 240
End of stack trace.
syncing disks...16 5  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 69eb9058-0362-23fd-9d6a-f99e4488aea0
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 0x000f27f0: 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