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From: bugzilla-noreply@freebsd.org
To: bugs@FreeBSD.org
Subject: [Bug 284275] Jingsha B85M-I: System hangs on boot unless
 kern.smp.disabled=1
Date: Wed, 22 Jan 2025 20:51:57 +0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: new
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 14.2-RELEASE
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X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: k4sum1@eclipse.cx
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D284275

            Bug ID: 284275
           Summary: Jingsha B85M-I: System hangs on boot unless
                    kern.smp.disabled=3D1
           Product: Base System
           Version: 14.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: k4sum1@eclipse.cx

Created attachment 256916
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D256916&action=
=3Dedit
Boot screen at freeze without kernel panic

System is a custom built PC with a Jingsha B85M-I mainboard and an i5 4570T
CPU. Booting in CSM/Legacy/MBR mode will result in the system hanging at bo=
ot.
UEFI mode is significantly more reliable, booting more often, but it still,
albeit rarely, can freeze at the same spot. (I've only seen this twice with
UEFI boot) Sometimes I get a kernel panic, but most of the time it just han=
gs
there. If I set kern.smp.disabled=3D1 the system boots up just fine.

The system just reboots if I boot without ACPI, the first few times it then
successfully booted without any changes, but I haven't been able to replica=
te
it again. Only one time booting without ACPI I got a kernel panic of "runni=
ng
without device atpic requires a local APIC"

If I reset the system instead of powering off then back on after a failed b=
oot,
it will sometimes successfully boot, however I haven't been able to replica=
te
that the past few times.

I've tested stock FreeBSD 14.2 and 13.3 (XigmaNAS 13.3.0.5), both have the =
same
issue and the fix is the same for both.

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