Diff of the two buildlogs:

--
--- b1/build.log	2024-05-08 22:00:42.243109942 +0000
+++ b2/build.log	2024-05-08 22:05:16.027457498 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Jun 10 16:22:35 -12 2025
-I: pbuilder-time-stamp: 1749615755
+I: Current time: Thu May  9 12:00:45 +14 2024
+I: pbuilder-time-stamp: 1715205645
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking seq-el_2.24-1.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2402517/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2846389/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos11-amd64.
+I: Changing host+domainname to test build reproducibility
+I: Adding a custom variable just for the fun of it...
+I: Changing /bin/sh to bash
+'/bin/sh' -> '/bin/bash'
+lrwxrwxrwx 1 root root 9 May  8 22:01 /bin/sh -> /bin/bash
+I: Setting pbuilder2's login shell to /bin/bash
+I: Setting pbuilder2's GECOS to second user,second room,second work-phone,second home-phone,second other
+I: user script /srv/workspace/pbuilder/2846389/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2846389/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build/reproducible-path'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
-  BUILD_ARCH='amd64'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=42 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='amd64'
+  BASH=/bin/sh
+  BASHOPTS=checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:globskipdots:hostcomplete:interactive_comments:patsub_replacement:progcomp:promptvars:sourcepath
+  BASH_ALIASES=()
+  BASH_ARGC=()
+  BASH_ARGV=()
+  BASH_CMDS=()
+  BASH_LINENO=([0]="12" [1]="0")
+  BASH_LOADABLES_PATH=/usr/local/lib/bash:/usr/lib/bash:/opt/local/lib/bash:/usr/pkg/lib/bash:/opt/pkg/lib/bash:.
+  BASH_SOURCE=([0]="/tmp/hooks/D02_print_environment" [1]="/tmp/hooks/D02_print_environment")
+  BASH_VERSINFO=([0]="5" [1]="2" [2]="21" [3]="1" [4]="release" [5]="x86_64-pc-linux-gnu")
+  BASH_VERSION='5.2.21(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=20 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='d64e93b7d01a46b49c55ffb1984f30e3'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  MAIL='/var/mail/root'
-  OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
-  PBCURRENTCOMMANDLINEOPERATION='build'
-  PBUILDER_OPERATION='build'
-  PBUILDER_PKGDATADIR='/usr/share/pbuilder'
-  PBUILDER_PKGLIBDIR='/usr/lib/pbuilder'
-  PBUILDER_SYSCONFDIR='/etc'
-  PPID='2402517'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=5fda60d0cc8b4af9b310089638e519fd
+  LANG=C
+  LANGUAGE=et_EE:et
+  LC_ALL=C
+  MACHTYPE=x86_64-pc-linux-gnu
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnu
+  PATH=/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path
+  PBCURRENTCOMMANDLINEOPERATION=build
+  PBUILDER_OPERATION=build
+  PBUILDER_PKGDATADIR=/usr/share/pbuilder
+  PBUILDER_PKGLIBDIR=/usr/lib/pbuilder
+  PBUILDER_SYSCONFDIR=/etc
+  PIPESTATUS=([0]="0")
+  POSIXLY_CORRECT=y
+  PPID=2846389
   PS4='+ '
-  PWD='/'
-  SHELL='/bin/bash'
-  SHLVL='2'
-  SUDO_COMMAND='/usr/bin/timeout -k 18.1h 18h /usr/bin/ionice -c 3 /usr/bin/nice /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.SjwDc9K9/pbuilderrc_cvMC --distribution unstable --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.SjwDc9K9/b1 --logfile b1/build.log seq-el_2.24-1.dsc'
-  SUDO_GID='110'
-  SUDO_UID='105'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://213.165.73.152:3128'
+  PWD=/
+  SHELL=/bin/bash
+  SHELLOPTS=braceexpand:errexit:hashall:interactive-comments:posix
+  SHLVL=3
+  SUDO_COMMAND='/usr/bin/timeout -k 24.1h 24h /usr/bin/ionice -c 3 /usr/bin/nice -n 11 /usr/bin/unshare --uts -- /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.SjwDc9K9/pbuilderrc_IEYl --distribution unstable --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.SjwDc9K9/b2 --logfile b2/build.log seq-el_2.24-1.dsc'
+  SUDO_GID=111
+  SUDO_UID=106
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://46.16.76.132:3128
 I: uname -a
-  Linux ionos5-amd64 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Jun  9 14:05 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/2402517/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May  7 07:42 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2846389/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -229,7 +261,7 @@
 Get: 117 http://deb.debian.org/debian unstable/main amd64 dh-elpa all 2.0.17 [31.0 kB]
 Get: 118 http://deb.debian.org/debian unstable/main amd64 dh-elpa-helper all 2.0.17 [8268 B]
 Get: 119 http://deb.debian.org/debian unstable/main amd64 elpa-shut-up all 0.3.3-4 [5932 B]
-Fetched 92.5 MB in 1s (65.3 MB/s)
+Fetched 92.5 MB in 4s (21.1 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libapparmor1:amd64.
 (Reading database ... 
(Reading database ... 5%
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(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19699 files and directories currently installed.)
@@ -756,7 +788,11 @@
 fakeroot is already the newest version (1.34-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/seq-el-2.24/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-genchanges -S  > ../seq-el_2.24-1_source.changes
+I: user script /srv/workspace/pbuilder/2846389/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/2846389/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/seq-el-2.24/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-genchanges -S  > ../seq-el_2.24-1_source.changes
 dpkg-buildpackage: info: source package seq-el
 dpkg-buildpackage: info: source version 2.24-1
 dpkg-buildpackage: info: source distribution unstable
@@ -772,43 +808,43 @@
    dh_autoreconf
    dh_elpa_test
 	emacs -batch -Q -l package --eval "(add-to-list 'package-directory-list \"/usr/share/emacs/site-lisp/elpa\")" --eval "(add-to-list 'package-directory-list \"/usr/share/emacs/site-lisp/elpa-src\")" -f package-initialize -L . -L tests --eval "(shut-up (when (featurep 'seq) (unload-feature 'seq t)))" -l tests/seq-tests.el --eval \(ert-run-tests-batch-and-exit\)
-Running 34 tests (2025-06-11 04:23:37+0000, selector `t')
-   passed   1/34  test-seq-concatenate (0.000306 sec)
-   passed   2/34  test-seq-contains (0.000407 sec)
-   passed   3/34  test-seq-count (0.000294 sec)
-   passed   4/34  test-seq-difference (0.000348 sec)
-   passed   5/34  test-seq-drop (0.000252 sec)
-   passed   6/34  test-seq-drop-while (0.000212 sec)
-   passed   7/34  test-seq-empty-p (0.000148 sec)
-   passed   8/34  test-seq-every-p (0.000390 sec)
-   passed   9/34  test-seq-filter (0.000288 sec)
-   passed  10/34  test-seq-find (0.000270 sec)
-   passed  11/34  test-seq-group-by (0.000282 sec)
-   passed  12/34  test-seq-intersection (0.000313 sec)
-   passed  13/34  test-seq-into (0.000142 sec)
-   passed  14/34  test-seq-into-and-identity (0.000090 sec)
-   passed  15/34  test-seq-let (0.000250 sec)
-   passed  16/34  test-seq-map-indexed (0.000150 sec)
-   passed  17/34  test-seq-mapcat (0.000109 sec)
-   passed  18/34  test-seq-mapn (0.000577 sec)
-   passed  19/34  test-seq-mapn-circular-lists (0.000117 sec)
-   passed  20/34  test-seq-min-max (0.000117 sec)
-   passed  21/34  test-seq-partition (0.000177 sec)
-   passed  22/34  test-seq-position (0.000279 sec)
-   passed  23/34  test-seq-random-elt-signal-on-empty (0.000099 sec)
-   passed  24/34  test-seq-random-elt-take-all (0.001642 sec)
-   passed  25/34  test-seq-reduce (0.000225 sec)
-   passed  26/34  test-seq-remove (0.000379 sec)
-   passed  27/34  test-seq-reverse (0.000120 sec)
-   passed  28/34  test-seq-some (0.000312 sec)
-   passed  29/34  test-seq-sort (0.000142 sec)
-   passed  30/34  test-seq-sort-by (0.000101 sec)
-   passed  31/34  test-seq-subseq (0.000268 sec)
-   passed  32/34  test-seq-take (0.000173 sec)
-   passed  33/34  test-seq-take-while (0.000212 sec)
-   passed  34/34  test-seq-uniq (0.000559 sec)
+Running 34 tests (2024-05-08 22:04:46+0000, selector `t')
+   passed   1/34  test-seq-concatenate (0.000496 sec)
+   passed   2/34  test-seq-contains (0.000888 sec)
+   passed   3/34  test-seq-count (0.000707 sec)
+   passed   4/34  test-seq-difference (0.000683 sec)
+   passed   5/34  test-seq-drop (0.005191 sec)
+   passed   6/34  test-seq-drop-while (0.000432 sec)
+   passed   7/34  test-seq-empty-p (0.000202 sec)
+   passed   8/34  test-seq-every-p (0.000819 sec)
+   passed   9/34  test-seq-filter (0.000533 sec)
+   passed  10/34  test-seq-find (0.000453 sec)
+   passed  11/34  test-seq-group-by (0.000746 sec)
+   passed  12/34  test-seq-intersection (0.000546 sec)
+   passed  13/34  test-seq-into (0.000232 sec)
+   passed  14/34  test-seq-into-and-identity (0.000113 sec)
+   passed  15/34  test-seq-let (0.000462 sec)
+   passed  16/34  test-seq-map-indexed (0.000179 sec)
+   passed  17/34  test-seq-mapcat (0.000159 sec)
+   passed  18/34  test-seq-mapn (0.001770 sec)
+   passed  19/34  test-seq-mapn-circular-lists (0.000150 sec)
+   passed  20/34  test-seq-min-max (0.000152 sec)
+   passed  21/34  test-seq-partition (0.007687 sec)
+   passed  22/34  test-seq-position (0.000553 sec)
+   passed  23/34  test-seq-random-elt-signal-on-empty (0.000140 sec)
+   passed  24/34  test-seq-random-elt-take-all (0.003841 sec)
+   passed  25/34  test-seq-reduce (0.000422 sec)
+   passed  26/34  test-seq-remove (0.000769 sec)
+   passed  27/34  test-seq-reverse (0.000171 sec)
+   passed  28/34  test-seq-some (0.000576 sec)
+   passed  29/34  test-seq-sort (0.008609 sec)
+   passed  30/34  test-seq-sort-by (0.000160 sec)
+   passed  31/34  test-seq-subseq (0.000453 sec)
+   passed  32/34  test-seq-take (0.000285 sec)
+   passed  33/34  test-seq-take-while (0.000415 sec)
+   passed  34/34  test-seq-uniq (0.001243 sec)
 
-Ran 34 tests, 34 results as expected, 0 unexpected (2025-06-11 04:23:37+0000, 0.011719 sec)
+Ran 34 tests, 34 results as expected, 0 unexpected (2024-05-08 22:04:46+0000, 0.057045 sec)
 
    create-stamp debian/debhelper-build-stamp
  fakeroot debian/rules binary
@@ -838,12 +874,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: including full source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/2846389/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2846389/tmp/hooks/B01_cleanup finished
 I: unmounting dev/ptmx filesystem
 I: unmounting dev/pts filesystem
 I: unmounting dev/shm filesystem
 I: unmounting proc filesystem
 I: unmounting sys filesystem
 I: cleaning the build env 
-I: removing directory /srv/workspace/pbuilder/2402517 and its subdirectories
-I: Current time: Tue Jun 10 16:23:41 -12 2025
-I: pbuilder-time-stamp: 1749615821
+I: removing directory /srv/workspace/pbuilder/2846389 and its subdirectories
+I: Current time: Thu May  9 12:05:15 +14 2024
+I: pbuilder-time-stamp: 1715205915