[Bug 250382] dump doesn't show timeest() when dumping to over 2TB

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250382

            Bug ID: 250382
           Summary: dump doesn't show timeest() when dumping to over 2TB
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: ish at amail.plala.or.jp

I was replacing disks on file server and changed ufs to zfs.
I'm restoring from ufs disk to zfs disks by dump & restore as follow.

% uname -a
FreeBSD onion.ish.org 12.2-RC2 FreeBSD 12.2-RC2 r366553 GENERIC  amd64
% su
# cd /media
# dump 0af - /dev/ada4p1 | restore rf -
  DUMP: Date of this level 0 dump: Thu Oct 15 08:59:56 2020
  DUMP: Date of last level 0 dump: the epoch
  DUMP: Dumping /dev/ada4p1 to standard output
  DUMP: mapping (Pass I) [regular files]
  DUMP: mapping (Pass II) [directories]
  DUMP: estimated 3755618369 tape blocks.
  DUMP: dumping (Pass III) [directories]
  DUMP: dumping (Pass IV) [regular files]
warning: ./music: File exists
warning: ./tmp: File exists
warning: ./video: File exists
warning: ./backup: File exists
  DUMP: 0.38% done, finished in 22:08 at Fri Oct 16 07:13:35 2020
  DUMP: 0.78% done, finished in 21:12 at Fri Oct 16 06:23:01 2020
  DUMP: 1.19% done, finished in 20:46 at Fri Oct 16 06:02:19 2020
..
(snip)
..
  DUMP: 56.47% done, finished in 9:41 at Fri Oct 16 07:17:28 2020
  DUMP: 56.76% done, finished in 9:39 at Fri Oct 16 07:19:30 2020
  DUMP: 57.06% done, finished in 9:35 at Fri Oct 16 07:21:11 2020
  DUMP: DUMP: 3755618304 tape blocks
  DUMP: finished in 85596 seconds, throughput 43876 KBytes/sec
  DUMP: DUMP IS DONE
#

  The timeest() didn't show after 57.06% of dump.
  I checked disks after about 30 minutes of 57.06%.

% zfs list
NAME                          USED  AVAIL  REFER  MOUNTPOINT
onion                        3.07T  25.1T   153K  none
onion/ROOT                    289M  25.1T   153K  none
onion/ROOT/default            289M  25.1T   289M  /
..
(snip)
..
onion/media                  2.10T  25.1T  12.3M  /media
onion/media/backup           43.3G  25.1T  43.3G  /media/backup
onion/media/music             188G  25.1T   188G  /media/music
onion/media/tmp               153K  25.1T   153K  /media/tmp
onion/media/video            1.88T  25.1T  1.88T  /media/video
..
(snip)

  It seems that dump doesn't show timeest() after dumping 2TB.
  Some counter are overflowing ?

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