[Bug 289220] Intel Xeon E5-2698 v4 X99 system will only boot with Hyper Threading or SMP turned OFF

In reply to: bugzilla-noreply_a_freebsd.org: "[Bug 289220] Intel Xeon E5-2698 v4 X99 system will only boot with SMP disabled"
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From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 03 Sep 2025 21:07:07 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289220

--- Comment #13 from Harley <sponix2ipfw@yahoo.com> ---
Created attachment 263457
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=263457&action=edit
Successful FreeBSD 14.3-RELEASE boot with SMP and Hyper Threading after a clean
boot and poweroff command from Fedora Linux 42.

Sometimes I can get a clean working boot after I am in Fedora Linux and issue a
full poweroff command there. This dmesg log is from such a boot. I am gearing
up to do another one with the patch provided prior for more specific output.
The kernel is building with that patch right now.

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