Fatal trap at booting after last kmacy_at_ changes

Last kernel got immediately fatal trap at boot, right after timer probe.
This is what I write by hand from the console:

Fatal trap 12: page fault while in kernel mode
fault code: supervisor read, page not present
stopped at sleepq_add+0xf6: cmpl $0,0(%rax,%eax,8)

stack trace:
sleepq_add
cv_timedwait
_sema_timedwait
ata_queue_request
...

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