[Bug 251276] [boot] Legacy BIOS boot hangs indefinitely with post-12.0-RELEASE loader

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251276

            Bug ID: 251276
           Summary: [boot] Legacy BIOS boot hangs indefinitely with
                    post-12.0-RELEASE loader
           Product: Base System
           Version: 12.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: ncollins at xes-inc.com

Created attachment 219835
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=219835&action=edit
screenshot of the step where booting hangs

With 12.1-RELEASE, 12.2-RELEASE, and 13.0-CURRENT's /boot/loader, my server
prints "BIOS drive X: is diskXX" lines, spins the cursor for a bit, and hangs
indefinitely. Removing all non-OS drives does not resolve the issue. I can
replace /boot/loader with the version from 12.0-RELEASE and boot fine, so this
seems like a regression.

This is likely hardware-specific; the server is a Supermicro SuperStorage
6049P-E1CR36L with a mirrored zpool as the root. It was initially installed
with 12.0-RELEASE, freebsd-update'd to 12.1-RELEASE, where this issue first
occurred (was worked around via UEFI, see below), then freebsd-update'd to
12.2-RELEASE, which didn't resolve the issue. I then tested 13.0-CURRENT's
loader and reverted to 12.0-RELEASE's loader.

UEFI boot has other problems - it hangs at the "Consoles: EFI" line and will
only boot normally if two drives are removed (all drive bays are usually
populated). The behavior is the same with 12.0-RELEASE's /boot/loader.efi, so
while it's an issue, it's probably unrelated and not a regression from
12.0-RELEASE.

This is potentially related to bug #241118, but the fix in base r356003
released in 12.2-RELEASE/13.0-CURRENT has not resolved the problem.

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