Diff of the two buildlogs:

--
--- b1/build.log	2024-04-10 19:43:12.095695984 +0000
+++ b2/build.log	2024-04-10 19:46:02.692427829 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Apr 10 07:36:56 -12 2024
-I: pbuilder-time-stamp: 1712777816
+I: Current time: Thu Apr 11 09:43:21 +14 2024
+I: pbuilder-time-stamp: 1712778201
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -27,52 +27,84 @@
 dpkg-source: info: applying 0001-remove-badge.diff
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/29393/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/15421/tmp/hooks/D01_modify_environment starting
+debug: Running on virt32a.
+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 10 19:43 /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/15421/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/15421/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='armhf'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=5 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='armhf'
+  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]="arm-unknown-linux-gnueabihf")
+  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=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=4 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='6df39135039d48169968f7d8beecded0'
-  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='29393'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=3f91748ad00643ae9de72495b16c09d1
+  LANG=C
+  LANGUAGE=it_CH:it
+  LC_ALL=C
+  MACHTYPE=arm-unknown-linux-gnueabihf
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnueabihf
+  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=15421
   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.LS6GJ6T5/pbuilderrc_DzY7 --distribution trixie --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.LS6GJ6T5/b1 --logfile b1/build.log m-buffer-el_0.15-2.1.dsc'
-  SUDO_GID='114'
-  SUDO_UID='109'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://10.0.0.15:3142/'
+  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.LS6GJ6T5/pbuilderrc_oTT3 --distribution trixie --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.LS6GJ6T5/b2 --logfile b2/build.log m-buffer-el_0.15-2.1.dsc'
+  SUDO_GID=113
+  SUDO_UID=107
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://10.0.0.15:3142/
 I: uname -a
-  Linux ff64a 6.1.0-18-arm64 #1 SMP Debian 6.1.76-1 (2024-02-01) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-18-armmp-lpae #1 SMP Debian 6.1.76-1 (2024-02-01) armv7l GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Apr  9 11:26 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/29393/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr 10 11:25 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/15421/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -232,7 +264,7 @@
 Get: 118 http://deb.debian.org/debian trixie/main armhf dh-elpa all 2.0.17 [31.0 kB]
 Get: 119 http://deb.debian.org/debian trixie/main armhf dh-elpa-helper all 2.0.17 [8268 B]
 Get: 120 http://deb.debian.org/debian trixie/main armhf elpa-seq all 2.24-1 [11.6 kB]
-Fetched 83.4 MB in 6s (14.8 MB/s)
+Fetched 83.4 MB in 14s (6161 kB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libapparmor1:armhf.
 (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 ... 19636 files and directories currently installed.)
@@ -758,7 +790,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/m-buffer-el-0.15/ && 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  > ../m-buffer-el_0.15-2.1_source.changes
+I: user script /srv/workspace/pbuilder/15421/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/15421/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/m-buffer-el-0.15/ && 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  > ../m-buffer-el_0.15-2.1_source.changes
 dpkg-buildpackage: info: source package m-buffer-el
 dpkg-buildpackage: info: source version 0.15-2.1
 dpkg-buildpackage: info: source distribution unstable
@@ -768,7 +804,7 @@
  debian/rules clean
 dh clean --with elpa
    dh_auto_clean
-	make -j5 clean
+	make -j4 clean
 make[1]: Entering directory '/build/reproducible-path/m-buffer-el-0.15'
 find . -name "m-buffer*org" -not -name "m-buffer-doc.org" \
    -exec rm {} \;
@@ -788,43 +824,43 @@
 make[1]: Leaving directory '/build/reproducible-path/m-buffer-el-0.15'
    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 test -l test/m-buffer-test.el -l test/m-buffer-at-test.el --eval \(ert-run-tests-batch-and-exit\)
-Running 34 tests (2024-04-10 19:42:25+0000, selector `t')
-   passed   1/34  apply-functions (0.008391 sec)
-   passed   2/34  buffer-for-match (0.001266 sec)
-   passed   3/34  case-fold-search (0.016678 sec)
-   passed   4/34  exact-subtract (0.012009 sec)
-   passed   5/34  exact-subtract-error (0.001069 sec)
-   passed   6/34  exact-subtract-error-simplified (0.001029 sec)
-   passed   7/34  exact-subtract-with-nil (0.000582 sec)
-   passed   8/34  first-line (0.012063 sec)
-   passed   9/34  line-end (0.007781 sec)
-   passed  10/34  line-start (0.003756 sec)
-   passed  11/34  m-buffer-at-eolp-1 (0.000746 sec)
-   passed  12/34  m-buffer-at-eolp-2 (0.000743 sec)
-   passed  13/34  m-buffer-at-eolp-3 (0.000729 sec)
-   passed  14/34  m-buffer-at-eolp-4 (0.000773 sec)
-   passed  15/34  m-buffer-loaded (0.000598 sec)
-   passed  16/34  m-buffer-match-begin (0.005945 sec)
-   passed  17/34  m-buffer-match-begin-pos (0.003056 sec)
-   passed  18/34  m-buffer-matches (0.005007 sec)
-   passed  19/34  m-buffer-nil-marker (0.005283 sec)
-   passed  20/34  m-buffer-string (0.000757 sec)
-   passed  21/34  m-with-temp-buffer-of-file (0.007344 sec)
-   passed  22/34  marker-to-pos (0.000898 sec)
-   passed  23/34  match-error (0.001130 sec)
-   passed  24/34  match-n (0.019642 sec)
-   passed  25/34  multi-match (0.010361 sec)
-   passed  26/34  normalize-args (0.002393 sec)
-   passed  27/34  page-matches (0.002914 sec)
-   passed  28/34  paragraph-separate (0.001833 sec)
-   passed  29/34  partition-by-markers (0.001960 sec)
-   passed  30/34  point-stationionary-with-current (0.003624 sec)
-   passed  31/34  replace-matches (0.011466 sec)
-   passed  32/34  replace-point-unmoved (0.004908 sec)
-   passed  33/34  sentence-end (0.003512 sec)
-   passed  34/34  subtract (0.009485 sec)
+Running 34 tests (2024-04-10 19:45:49+0000, selector `t')
+   passed   1/34  apply-functions (0.001081 sec)
+   passed   2/34  buffer-for-match (0.000283 sec)
+   passed   3/34  case-fold-search (0.002089 sec)
+   passed   4/34  exact-subtract (0.001353 sec)
+   passed   5/34  exact-subtract-error (0.000231 sec)
+   passed   6/34  exact-subtract-error-simplified (0.000229 sec)
+   passed   7/34  exact-subtract-with-nil (0.000142 sec)
+   passed   8/34  first-line (0.000875 sec)
+   passed   9/34  line-end (0.000861 sec)
+   passed  10/34  line-start (0.000822 sec)
+   passed  11/34  m-buffer-at-eolp-1 (0.000172 sec)
+   passed  12/34  m-buffer-at-eolp-2 (0.000172 sec)
+   passed  13/34  m-buffer-at-eolp-3 (0.000164 sec)
+   passed  14/34  m-buffer-at-eolp-4 (0.000164 sec)
+   passed  15/34  m-buffer-loaded (0.000145 sec)
+   passed  16/34  m-buffer-match-begin (0.000623 sec)
+   passed  17/34  m-buffer-match-begin-pos (0.000682 sec)
+   passed  18/34  m-buffer-matches (0.001072 sec)
+   passed  19/34  m-buffer-nil-marker (0.001156 sec)
+   passed  20/34  m-buffer-string (0.000178 sec)
+   passed  21/34  m-with-temp-buffer-of-file (0.000614 sec)
+   passed  22/34  marker-to-pos (0.000212 sec)
+   passed  23/34  match-error (0.000255 sec)
+   passed  24/34  match-n (0.002384 sec)
+   passed  25/34  multi-match (0.001588 sec)
+   passed  26/34  normalize-args (0.000597 sec)
+   passed  27/34  page-matches (0.000664 sec)
+   passed  28/34  paragraph-separate (0.000342 sec)
+   passed  29/34  partition-by-markers (0.000475 sec)
+   passed  30/34  point-stationionary-with-current (0.000801 sec)
+   passed  31/34  replace-matches (0.001569 sec)
+   passed  32/34  replace-point-unmoved (0.001092 sec)
+   passed  33/34  sentence-end (0.000762 sec)
+   passed  34/34  subtract (0.001198 sec)
 
-Ran 34 tests, 34 results as expected, 0 unexpected (2024-04-10 19:42:25+0000, 0.285310 sec)
+Ran 34 tests, 34 results as expected, 0 unexpected (2024-04-10 19:45:50+0000, 0.031088 sec)
 
    create-stamp debian/debhelper-build-stamp
    dh_prep
@@ -854,12 +890,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: not including original source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/15421/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/15421/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/29393 and its subdirectories
-I: Current time: Wed Apr 10 07:43:05 -12 2024
-I: pbuilder-time-stamp: 1712778185
+I: removing directory /srv/workspace/pbuilder/15421 and its subdirectories
+I: Current time: Thu Apr 11 09:45:58 +14 2024
+I: pbuilder-time-stamp: 1712778358