Bug 167393

Summary: [boot] MacBook4,1 hangs on SMP boot
Product: Base System Reporter: Dave Vasilevsky <dave>
Component: amd64Assignee: freebsd-amd64 (Nobody) <amd64>
Status: Closed FIXED    
Severity: Affects Only Me CC: imp
Priority: Normal    
Version: 9.0-RELEASE   
Hardware: Any   
OS: Any   
Attachments:
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Description Dave Vasilevsky 2012-04-28 18:10:04 UTC 
Kernel hangs early in boot just after printing "ACPI APIC Table: <APPLE Apple00>", and a few seconds later starts printing something so quickly I can't read it. Boot process does not continue.

This sounds similar to bug 151385, but it's hard to tell if it's the same, and that bug is with an older kernel.

Fix: Turning off SMP (setting kern.smp.disabled=1 in loader) causes the bug to go away. This is how I was able to test an installed system. Losing use of the second CPU is non-optimal, though.

Alternatively, patching sys/amd64/amd64/machdep.c to add MacBook4,1 to the LEGACY_USB_EN blacklist makes the bug go away too. I haven't noticed any negative side effects. However, if I boot using grub2 instead of loader(8), the bug still manifests, even with this patch.


Patch attached with submission follows:
How-To-Repeat: Start up a MacBook4,1 from the FreeBSD-9.0-RELEASE-amd64-dvd1 DVD, observe that boot hangs and doesn't continue. Booting from an already installed FreeBSD 9.0 system will also produce this bug.
Comment 1 Eitan Adler freebsd_committer freebsd_triage 2017-12-31 08:01:33 UTC 
For bugs matching the following criteria:

Status: In Progress Changed: (is less than) 2014-06-01

Reset to default assignee and clear in-progress tags.

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Comment 2 Warner Losh freebsd_committer freebsd_triage 2019-01-07 18:38:48 UTC 
This fix has already been committed to FreeBSD, and looks to have been in there for some time! Thanks!