Diff of the two buildlogs:

--
--- b1/build.log	2023-04-23 00:39:58.523624390 +0000
+++ b2/build.log	2023-04-23 00:41:13.992278193 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri May 24 19:02:10 -12 2024
-I: pbuilder-time-stamp: 1716620530
+I: Current time: Sun Apr 23 14:40:02 +14 2023
+I: pbuilder-time-stamp: 1682210402
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bookworm-reproducible-base.tgz]
 I: copying local configuration
@@ -16,7 +16,7 @@
 I: copying [./seq-el_2.23.orig.tar.xz]
 I: copying [./seq-el_2.23-1.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Tue Dec 21 08:39:35 2021 -12
+gpgv: Signature made Wed Dec 22 10:39:35 2021 +14
 gpgv:                using RSA key 9B917007AE030E36E4FC248B695B7AE4BF066240
 gpgv: Can't check signature: No public key
 dpkg-source: warning: cannot verify inline signature for ./seq-el_2.23-1.dsc: no acceptable signature found
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking seq-el_2.23-1.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/10037/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/18388/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink12-arm64.
+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 Apr 23 14:40 /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/18388/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/18388/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
-  BUILD_ARCH='arm64'
-  DEBIAN_FRONTEND='noninteractive'
+  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]="15" [3]="1" [4]="release" [5]="aarch64-unknown-linux-gnu")
+  BASH_VERSION='5.2.15(1)-release'
+  BUILDDIR=/build
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=arm64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=8'
-  DISTRIBUTION='bookworm'
-  HOME='/var/lib/jenkins'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=bookworm
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/var/lib/jenkins
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  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='10037'
-  PS1='# '
-  PS2='> '
+  LANG=C
+  LANGUAGE=nl_BE:nl
+  LC_ALL=C
+  MACHTYPE=aarch64-unknown-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=18388
   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.JSmAeXLI/pbuilderrc_2Lop --distribution bookworm --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.JSmAeXLI/b1 --logfile b1/build.log seq-el_2.23-1.dsc'
-  SUDO_GID='117'
-  SUDO_UID='110'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  USERNAME='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.16:3128'
+  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.JSmAeXLI/pbuilderrc_XtWM --distribution bookworm --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.JSmAeXLI/b2 --logfile b2/build.log --extrapackages usrmerge seq-el_2.23-1.dsc'
+  SUDO_GID=117
+  SUDO_UID=110
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  USERNAME=root
+  _='I: set'
+  http_proxy=http://192.168.101.16:3128
 I: uname -a
-  Linux codethink11-arm64 4.15.0-209-generic #220-Ubuntu SMP Tue Mar 21 19:52:44 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-209-generic #220-Ubuntu SMP Tue Mar 21 19:52:44 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 24 04:47 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/10037/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr 22 00:25 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/18388/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -200,7 +232,7 @@
 Get: 88 http://deb.debian.org/debian bookworm/main arm64 dh-elpa all 2.0.16 [31.0 kB]
 Get: 89 http://deb.debian.org/debian bookworm/main arm64 dh-elpa-helper all 2.0.16 [8196 B]
 Get: 90 http://deb.debian.org/debian bookworm/main arm64 elpa-shut-up all 0.3.3-4 [5932 B]
-Fetched 66.6 MB in 1s (47.1 MB/s)
+Fetched 66.6 MB in 1s (45.7 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package install-info.
 (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(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 ... 19616 files and directories currently installed.)
@@ -597,10 +629,15 @@
 Reading package lists...
 Building dependency tree...
 Reading state information...
+usrmerge is already the newest version (35).
 fakeroot is already the newest version (1.31-1.2).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/seq-el-2.23/ && 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_2.23-1_source.changes
+I: user script /srv/workspace/pbuilder/18388/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/18388/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/seq-el-2.23/ && 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_2.23-1_source.changes
 dpkg-buildpackage: info: source package seq-el
 dpkg-buildpackage: info: source version 2.23-1
 dpkg-buildpackage: info: source distribution unstable
@@ -617,43 +654,43 @@
    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 \(ert-run-tests-batch-and-exit\)
 seq-25.el: Warning: `seq-contains' is an obsolete generic function (as of 27.1); use `seq-contains-p' instead.
-Running 34 tests (2024-05-24 19:02:50-1200, selector `t')
-   passed   1/34  test-seq-concatenate (0.000476 sec)
-   passed   2/34  test-seq-contains (0.000350 sec)
-   passed   3/34  test-seq-count (0.000393 sec)
-   passed   4/34  test-seq-difference (0.000359 sec)
-   passed   5/34  test-seq-drop (0.000584 sec)
-   passed   6/34  test-seq-drop-while (0.000431 sec)
-   passed   7/34  test-seq-empty-p (0.000238 sec)
-   passed   8/34  test-seq-every-p (0.000450 sec)
-   passed   9/34  test-seq-filter (0.000407 sec)
-   passed  10/34  test-seq-find (0.000303 sec)
-   passed  11/34  test-seq-group-by (0.000274 sec)
-   passed  12/34  test-seq-intersection (0.000281 sec)
-   passed  13/34  test-seq-into (0.000276 sec)
-   passed  14/34  test-seq-into-and-identity (0.000160 sec)
-   passed  15/34  test-seq-let (0.000590 sec)
-   passed  16/34  test-seq-map-indexed (0.000172 sec)
-   passed  17/34  test-seq-mapcat (0.000207 sec)
-   passed  18/34  test-seq-mapn (0.001308 sec)
-   passed  19/34  test-seq-mapn-circular-lists (0.000175 sec)
-   passed  20/34  test-seq-min-max (0.000277 sec)
-   passed  21/34  test-seq-partition (0.000437 sec)
-   passed  22/34  test-seq-position (0.000297 sec)
-   passed  23/34  test-seq-random-elt-signal-on-empty (0.000185 sec)
-   passed  24/34  test-seq-random-elt-take-all (0.050413 sec)
-   passed  25/34  test-seq-reduce (0.000331 sec)
-   passed  26/34  test-seq-remove (0.000430 sec)
-   passed  27/34  test-seq-reverse (0.000195 sec)
-   passed  28/34  test-seq-some (0.000315 sec)
-   passed  29/34  test-seq-sort (0.000243 sec)
-   passed  30/34  test-seq-sort-by (0.000131 sec)
-   passed  31/34  test-seq-subseq (0.000540 sec)
-   passed  32/34  test-seq-take (0.000366 sec)
-   passed  33/34  test-seq-take-while (0.000511 sec)
-   passed  34/34  test-seq-uniq (0.000408 sec)
+Running 34 tests (2023-04-23 14:41:02+1400, selector `t')
+   passed   1/34  test-seq-concatenate (0.000519 sec)
+   passed   2/34  test-seq-contains (0.000382 sec)
+   passed   3/34  test-seq-count (0.000425 sec)
+   passed   4/34  test-seq-difference (0.000698 sec)
+   passed   5/34  test-seq-drop (0.000636 sec)
+   passed   6/34  test-seq-drop-while (0.000474 sec)
+   passed   7/34  test-seq-empty-p (0.000256 sec)
+   passed   8/34  test-seq-every-p (0.000493 sec)
+   passed   9/34  test-seq-filter (0.000475 sec)
+   passed  10/34  test-seq-find (0.000359 sec)
+   passed  11/34  test-seq-group-by (0.000348 sec)
+   passed  12/34  test-seq-intersection (0.000317 sec)
+   passed  13/34  test-seq-into (0.000270 sec)
+   passed  14/34  test-seq-into-and-identity (0.000172 sec)
+   passed  15/34  test-seq-let (0.000642 sec)
+   passed  16/34  test-seq-map-indexed (0.000179 sec)
+   passed  17/34  test-seq-mapcat (0.000220 sec)
+   passed  18/34  test-seq-mapn (0.001598 sec)
+   passed  19/34  test-seq-mapn-circular-lists (0.000183 sec)
+   passed  20/34  test-seq-min-max (0.000275 sec)
+   passed  21/34  test-seq-partition (0.000461 sec)
+   passed  22/34  test-seq-position (0.000322 sec)
+   passed  23/34  test-seq-random-elt-signal-on-empty (0.000194 sec)
+   passed  24/34  test-seq-random-elt-take-all (0.055737 sec)
+   passed  25/34  test-seq-reduce (0.000391 sec)
+   passed  26/34  test-seq-remove (0.000824 sec)
+   passed  27/34  test-seq-reverse (0.000226 sec)
+   passed  28/34  test-seq-some (0.000368 sec)
+   passed  29/34  test-seq-sort (0.000278 sec)
+   passed  30/34  test-seq-sort-by (0.000164 sec)
+   passed  31/34  test-seq-subseq (0.000628 sec)
+   passed  32/34  test-seq-take (0.000415 sec)
+   passed  33/34  test-seq-take-while (0.000788 sec)
+   passed  34/34  test-seq-uniq (0.000462 sec)
 
-Ran 34 tests, 34 results as expected, 0 unexpected (2024-05-24 19:02:50-1200, 0.067201 sec)
+Ran 34 tests, 34 results as expected, 0 unexpected (2023-04-23 14:41:02+1400, 0.075543 sec)
 
    create-stamp debian/debhelper-build-stamp
  fakeroot debian/rules binary
@@ -683,12 +720,14 @@
 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/18388/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/18388/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/10037 and its subdirectories
-I: Current time: Fri May 24 19:02:57 -12 2024
-I: pbuilder-time-stamp: 1716620577
+I: removing directory /srv/workspace/pbuilder/18388 and its subdirectories
+I: Current time: Sun Apr 23 14:41:12 +14 2023
+I: pbuilder-time-stamp: 1682210472