[Bug 244118] 13-CURRENT Kernel post r357547 hang during boot on PowerMac G5Q

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244118

--- Comment #3 from Ryan Libby <rlibby at freebsd.org> ---
Created attachment 211651
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=211651&action=edit
Print zone layouts

Okay, could you try out this patch?  It won't fix anything, it will
hopefully just tell us what difference r357549 makes.  So, first could
you try it with vm.debug.uma_multipage_slabs="0", and then grep for
"keg.*layout" in /var/log/messages and attach that somewhere, and then
again with vm.debug.uma_multipage_slabs="1"?  There should be a number
of zones which end up with different layouts between the two and likely
one of those is causing the issue.

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