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Subject: [Bug 211548] [mps] Activating X2Apic Mode in BIOS results in
 "io_cmds_active is out of sync errors", won't boot
Date: Wed, 03 Aug 2016 18:35:22 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D211548

Konstantin Belousov <kib@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kib@FreeBSD.org

--- Comment #1 from Konstantin Belousov <kib@FreeBSD.org> ---
(In reply to Benedict Reuschling from comment #0)
What exactly the statement 'won't boot' mean ?  Does the machine enters
infinite
loop with the messages ?

I would like to see the verbose dmesg with the x2APIC option turned off and=
 on
(can you capture using serial console ?).

Can you compile and boot kernel without mps(4) ?  You probably would be not
able to mount local root, but I need messages and not the operational syste=
m.

I do not think IPIs are ever used at the device probe stage, so it might be
some pecularity in the BIOS resources allocation triggered by the option.

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