[Bug 289297] Intel Xeon 6 with high number of threads

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289297

--- Comment #28 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=55305b590797524dd1cecfc9406869700e925e51

commit 55305b590797524dd1cecfc9406869700e925e51
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-01-03 01:09:32 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-01-05 23:12:22 +0000

    x86: change ap_boot_mtx from spinlock mutex to naive lock

    Problem is that the printfs done under the spinlock might be very slow,
    then spinlock triggers the panic due to some AP holding the mutex too
    long.  We do want to ensure that the printfs are serialized, still.

    Also, reduce the scope of the lock. The local APIC and MTRR
    initializations are local to the AP, while mca_init() protects the
    shared state with mca-private spinlock.

    PR:     289297
    Reviewed by:    markj
    Sponsored by:   The FreeBSD Foundation
    MFC after:      1 week
    Differential revision:  https://reviews.freebsd.org/D54464

 sys/amd64/amd64/mp_machdep.c |  1 -
 sys/i386/i386/mp_machdep.c   |  2 --
 sys/x86/include/x86_smp.h    |  1 -
 sys/x86/x86/mp_x86.c         | 17 ++++++++++++-----
 4 files changed, 12 insertions(+), 9 deletions(-)

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