[Bug 202551] ACPI, Exception, AE_ERROR, Could not acquire mutex

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202551

            Bug ID: 202551
           Summary: ACPI, Exception, AE_ERROR, Could not acquire mutex
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: krisb at interia.eu

Created attachment 160184
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=160184&action=edit
Screen when problem is reported

User performs system shutdown (power off) - (irrespectively - through desktop
manager or console), everything is fine until computer is supposed to turn off.
Then it takes couple of seconds and the error is reported.  Unfortunately error
message does not survive reboot so it is shown in attached picture only, taken
from screen.

Not deterministic problem, with following traits:
- appears randomly but more than once every 10 shutdown at average 
- does not seem to be related to system up time. It was observed after few
minutes of system uptime as well as after days of uptime
- does not seem to be related to any particular activities / tasks system had
been performing during uptime

Misleading information is that system was going to reboot. That is not the case
- system was going down for halt and turn off.

When it occurs computer remains in that state, does not turn off, CPU
utilization must be high (fan is spinning like a crazy). Any key stroke would
initiate system reboot.

Please let me know what (and how) further symptoms can be collected

Regards
Kris

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