syzbot

uvm_fault(0xfffffd807f015550, 0x8, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff81c85bae cs 8 rflags 10246 cr2 8 cpl 0 rsp ffff800021739130
gsbase 0xffffffff82996ff0  kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff81c85bae
Starting stack trace...
panic(ffffffff8256d3a3) at panic+0x155 sys/kern/subr_prf.c:229
kerntrap(ffff800021739080) at kerntrap+0x1b7 sys/arch/amd64/amd64/trap.c:313
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
fifo_write(ffff800021739180) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:271
VOP_WRITE(fffffd80668b6718,ffff800021739230,3,fffffd807f7d7888) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
ktrwriteraw(ffff8000216ffcf0,fffffd80668b6718,fffffd807f7d7888,ffff8000217392f0,ffff8000217392d0) at ktrwriteraw+0x13d sys/kern/kern_ktrace.c:660
ktrstruct(ffff8000216ffcf0,ffffffff8260b323,ffff800021739430,70) at ktrstruct+0x16f ktrwrite2 sys/kern/kern_ktrace.c:625 [inline]
ktrstruct(ffff8000216ffcf0,ffffffff8260b323,ffff800021739430,70) at ktrstruct+0x16f sys/kern/kern_ktrace.c:309
iovec_copyin(7f7ffffd7030,ffff8000217394e8,ffff800021739430,7,ffff8000217394e0) at iovec_copyin+0x16c sys/kern/sys_generic.c:115
sys_writev(ffff8000216ffcf0,ffff800021739550,ffff8000217395b0) at sys_writev+0x5a sys/kern/sys_generic.c:314
syscall(ffff800021739620) at syscall+0x447 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffd4dc0, 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 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 0x000f24c0: 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