[Bug 253272] Page fault in _mca_init during boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253272

--- Comment #3 from commit-hook at FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=b5770470276268acef21368b3e77a325df883500

commit b5770470276268acef21368b3e77a325df883500
Author:     Mark Johnston <markj at FreeBSD.org>
AuthorDate: 2021-02-08 19:42:54 +0000
Commit:     Mark Johnston <markj at FreeBSD.org>
CommitDate: 2021-02-08 19:42:54 +0000

    mca: Handle inconsistent CMCI capability reporting

    A BIOS bug may apparently cause the BSP to report that it does not
    implement CMCI, with some APs reporting that they do.  In this scenario,
    avoid a NULL pointer dereference that occurs in cmci_monitor() because
    cmc_state was not allocated by the BSP.

    PR:             253272
    Reported by:    asomers, mmacy
    Reviewed by:    kib (previous version)
    MFC after:      1 week

 sys/x86/x86/mca.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

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