[Bug 263501] zdb failure: zdb failed to hold dataset 'tank/ROOT/default': No such file or directory

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263501

            Bug ID: 263501
           Summary: zdb failure: zdb failed to hold dataset
                    'tank/ROOT/default': No such file or directory
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: mason@blisses.org

In BZ#263407 it seems that the bootloader struggles to deal with files with
holes immediately after them. In that bug's comments, kevans noted zdb 
output that displays the properties of affected and unaffected files, doing
something like this:

    # zdb -vvvvvvO tank/ROOT/default boot/kernel/geom_eli.ko

Unfortunately, while this works for OpenZFS built for Debian, on FreeBSD
13.0, and on FreeBSD 12, I'm finding that it consistently fails on 13.1 
installs, giving me this message:

    zdb failed to hold dataset 'tank/ROOT/default': No such file or directory

My immediate concern is that 13.1-RC4 doesn't display the bad behaviour 
from the original bug, so testing a fix will involve contructing a file to
match the problematic pattern, using posix-fallocate or or ftruncate or 
somesuch. However, without being able to use zdb, it'll be significantly
more difficult to verify that the file(s) in question match the pattern or
not.

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