LORs on ctrl-alt-del and halt

[grarpamp]

FYI two repeatable LOR's...

Let 12.0-current r324306 amd64 efi boot from usb to installer screen,
do nothing but hit ctrl-alt-del...

1st 0x7f028e0 filedesc structure kern/sys_generic.c:1490
2nd 0x7da8068 devfs kern/vfs_vnops.c:1524

Let 12.0-current r324306 amd64 efi boot from usb to installer screen,
do nothing but switch to alt-f4 ttyv3, enter halt...

1st 0x7d4d9a0 ufs kern/vfs_mount.c:1274
2nd 0x79d3240 devfs kern/vfs_subr.c:2606