RELENG_5 panic: mtx_lock() with ACPI

[Anish Mistry]

I'm getting the following panic on boot only with ACPI enabled.
On a verbose boot right after: start_init: trying /sbin/init
panic: mtx_lock() of spin mutex(null) @ /usr/src/sys/tty/tty.c:2809
Can't seem to get a dump even if dumpdev is set at the loader prompt.

Verbose boot without ACPI enabled and ASL attached.

-- 
Anish Mistry
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