syzbot

uvm_fault(0xfffffd805b357b00, 0x8, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff81a54ccf cs 8 rflags 10246 cr2 8 cpl 0 rsp ffff80002c10f5f0
gsbase 0xffffffff82cb5ff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff81a54ccf
Starting stack trace...
panic(ffffffff8282b4eb) at panic+0x159 sys/kern/subr_prf.c:229
kerntrap(ffff80002c10f540) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
fifo_write(ffff80002c10f630) at fifo_write+0x4f sys/miscfs/fifofs/fifo_vnops.c:273
VOP_WRITE(fffffd80524ca010,ffff80002c10f6c8,8,fffffd807f7d76e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
vn_rdwr(1,fffffd80524ca010,ffff80002a5f7400,fc,0,1,12f04b75a5b14634,ffff80002c10f7f0,fffffd80524ca010,78) at vn_rdwr+0xee sys/kern/vfs_vnops.c:324
ufs_symlink(ffff80002c10f7f0) at ufs_symlink+0x169 sys/ufs/ufs/ufs_vnops.c:1314
VOP_SYMLINK(fffffd805aba8610,ffff80002c10f970,ffff80002c10f9a0,ffff80002c10f8a0,ffff80002a5f7400) at VOP_SYMLINK+0xd7 sys/kern/vfs_vops.c:426
dosymlinkat(ffff80002c0f6f90,20000700,3,200004c0) at dosymlinkat+0x158 sys/kern/vfs_syscalls.c:1809
syscall(ffff80002c10fb20) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xcc1462bb450, count: 246
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 1f64d870-06f2-d8bf-7327-adc6877a2997
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 $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