I'm trying to install CURRENT 
(FreeBSD-14.0-CURRENT-amd64-20210408-15dc713ceb5-245885-memstick.img) snapshot 
onto Lenovo Thinkpad T540p, i7-4700 based laptop.

 Kernel traps on boot with "Fatal trap 9" and this stack trace (hand-copied):

calltrap()
--- trap 0x9
run_interrupt_driven_config_hooks()
boot_run_interrupt_driven_config_hooks()
mi_startup()

 It is 100% reproducible, and I cannot issue commands to kernel debugger, 
keyboard is dead.

 Enabling verbose boot helps, with verbose boot it boots to installer.

 Looks like some race condition.

 Is it known problem?

--
// Lev Serebryakov
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