[Bug 274315] EFI loader repeats "efi_check_space: Unable to expand staging area" indefinitely with too-large kernel

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 06 Oct 2023 20:23:46 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274315

            Bug ID: 274315
           Summary: EFI loader repeats "efi_check_space: Unable to expand
                    staging area" indefinitely with too-large kernel
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: emaste@freebsd.org

While experimenting with unreasonably large MAXCPU (e.g. options MAXCPU 65536)
I ended up building an excessively large kernel.

When trying to load this kernel, the loader just repeats "efi_check_space:
Unable to expand staging area" indefinitely (until a timeout expires and
terminates the emulator).

This is on amd64 booting in QEMU, tools/boot/ci-qemu-test.sh invoked from
Cirrus-CI.
https://cirrus-ci.com/task/4713847798366208?logs=test

efi_check_space: Unable to expand staging area
efi_check_space: Unable to expand staging area
efi_check_space: Unable to expand staging area
efi_check_space: Unable to expand staging area
efi_check_space: Unable to expand staging area
efi_check_space: Unabqemu-system-x86_64: terminating on signal 15 from pid
31542 (timeout)
Did not boot successfully, see /tmp/ci-qemu-test-boot.log

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