Diff of the two buildlogs:

--
--- b1/build.log	2025-03-10 10:56:51.938931232 +0000
+++ b2/build.log	2025-03-10 10:57:32.385120459 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Mar  9 22:56:05 -12 2025
-I: pbuilder-time-stamp: 1741604165
+I: Current time: Mon Apr 13 07:19:49 +14 2026
+I: pbuilder-time-stamp: 1776014389
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -26,54 +26,86 @@
 dpkg-source: info: applying merge-from-sid-dgit.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3716/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/77895/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos16-i386.
+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 12 17:20 /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/77895/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/77895/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='i386'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=11 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='i386'
+  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]="37" [3]="1" [4]="release" [5]="i686-pc-linux-gnu")
+  BASH_VERSION='5.2.37(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=i386
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=21 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=i686
+  HOST_ARCH=i386
   IFS=' 	
   '
-  INVOCATION_ID='b1567b49ebca40ddae97591f98d4151c'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  LD_LIBRARY_PATH='/usr/lib/libeatmydata'
-  LD_PRELOAD='libeatmydata.so'
-  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='3716'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=8ef3093b32394f74a3b98e96c2dac2dd
+  LANG=C
+  LANGUAGE=de_CH:de
+  LC_ALL=C
+  LD_LIBRARY_PATH=/usr/lib/libeatmydata
+  LD_PRELOAD=libeatmydata.so
+  MACHTYPE=i686-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=77895
   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.hMftSykk/pbuilderrc_erZT --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.hMftSykk/b1 --logfile b1/build.log m-buffer-el_0.15-4.dsc'
-  SUDO_GID='112'
-  SUDO_UID='107'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://46.16.76.132:3128'
+  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.hMftSykk/pbuilderrc_CZ6L --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.hMftSykk/b2 --logfile b2/build.log m-buffer-el_0.15-4.dsc'
+  SUDO_GID=112
+  SUDO_UID=107
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://213.165.73.152:3128
 I: uname -a
-  Linux ionos2-i386 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3716/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar  4  2025 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/77895/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -207,7 +239,7 @@
 Get: 94 http://deb.debian.org/debian trixie/main i386 libtext-glob-perl all 0.11-3 [7676 B]
 Get: 95 http://deb.debian.org/debian trixie/main i386 libfile-find-rule-perl all 0.34-3 [26.6 kB]
 Get: 96 http://deb.debian.org/debian trixie/main i386 dh-elpa all 2.1.8 [30.4 kB]
-Fetched 81.9 MB in 1s (82.8 MB/s)
+Fetched 81.9 MB in 1s (79.3 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package netbase.
 (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 ... 19787 files and directories currently installed.)
@@ -624,7 +656,11 @@
 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_0.15-4_source.changes
+I: user script /srv/workspace/pbuilder/77895/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/77895/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_0.15-4_source.changes
 dpkg-buildpackage: info: source package m-buffer-el
 dpkg-buildpackage: info: source version 0.15-4
 dpkg-buildpackage: info: source distribution unstable
@@ -634,7 +670,7 @@
  debian/rules clean
 dh clean --with elpa
    dh_auto_clean
-	make -j11 clean
+	make -j21 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 {} \;
@@ -653,44 +689,44 @@
 skipping upstream build
 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\")" --eval "(setq ert-batch-backtrace-right-margin nil)" -f package-initialize -L . -L test -l test/m-buffer-test.el -l test/m-buffer-at-test.el -f ert-run-tests-batch-and-exit
-Running 34 tests (2025-03-10 10:56:46+0000, selector `t')
-   passed   1/34  apply-functions (0.000935 sec)
-   passed   2/34  buffer-for-match (0.000121 sec)
-   passed   3/34  case-fold-search (0.001417 sec)
-   passed   4/34  exact-subtract (0.001345 sec)
-   passed   5/34  exact-subtract-error (0.000109 sec)
-   passed   6/34  exact-subtract-error-simplified (0.000098 sec)
-   passed   7/34  exact-subtract-with-nil (0.000057 sec)
-   passed   8/34  first-line (0.000765 sec)
-   passed   9/34  line-end (0.000415 sec)
-   passed  10/34  line-start (0.000456 sec)
-   passed  11/34  m-buffer-at-eolp-1 (0.000091 sec)
-   passed  12/34  m-buffer-at-eolp-2 (0.000077 sec)
+	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\")" --eval "(setq ert-batch-backtrace-right-margin nil)" -f package-initialize -L . -L test -l test/m-buffer-at-test.el -l test/m-buffer-test.el -f ert-run-tests-batch-and-exit
+Running 34 tests (2026-04-12 17:20:23+0000, selector `t')
+   passed   1/34  apply-functions (0.000761 sec)
+   passed   2/34  buffer-for-match (0.000133 sec)
+   passed   3/34  case-fold-search (0.000983 sec)
+   passed   4/34  exact-subtract (0.000747 sec)
+   passed   5/34  exact-subtract-error (0.000121 sec)
+   passed   6/34  exact-subtract-error-simplified (0.000121 sec)
+   passed   7/34  exact-subtract-with-nil (0.000061 sec)
+   passed   8/34  first-line (0.000516 sec)
+   passed   9/34  line-end (0.000346 sec)
+   passed  10/34  line-start (0.000337 sec)
+   passed  11/34  m-buffer-at-eolp-1 (0.000087 sec)
+   passed  12/34  m-buffer-at-eolp-2 (0.000075 sec)
    passed  13/34  m-buffer-at-eolp-3 (0.000082 sec)
-   passed  14/34  m-buffer-at-eolp-4 (0.000083 sec)
-   passed  15/34  m-buffer-loaded (0.000064 sec)
-   passed  16/34  m-buffer-match-begin (0.000848 sec)
-   passed  17/34  m-buffer-match-begin-pos (0.000355 sec)
-   passed  18/34  m-buffer-matches (0.000530 sec)
-   passed  19/34  m-buffer-nil-marker (0.020936 sec)
-   passed  20/34  m-buffer-string (0.000085 sec)
-   passed  21/34  m-with-temp-buffer-of-file (0.000856 sec)
-   passed  22/34  marker-to-pos (0.000099 sec)
-   passed  23/34  match-error (0.000133 sec)
-   passed  24/34  match-n (0.001279 sec)
-   passed  25/34  multi-match (0.001283 sec)
-   passed  26/34  normalize-args (0.000270 sec)
-   passed  27/34  page-matches (0.000370 sec)
-   passed  28/34  paragraph-separate (0.000164 sec)
-   passed  29/34  partition-by-markers (0.000167 sec)
-   passed  30/34  point-stationionary-with-current (0.000381 sec)
-   passed  31/34  replace-matches (0.000744 sec)
-   passed  32/34  replace-point-unmoved (0.000555 sec)
-   passed  33/34  sentence-end (0.000385 sec)
-   passed  34/34  subtract (0.000567 sec)
+   passed  14/34  m-buffer-at-eolp-4 (0.000080 sec)
+   passed  15/34  m-buffer-loaded (0.000063 sec)
+   passed  16/34  m-buffer-match-begin (0.000577 sec)
+   passed  17/34  m-buffer-match-begin-pos (0.000289 sec)
+   passed  18/34  m-buffer-matches (0.000420 sec)
+   passed  19/34  m-buffer-nil-marker (0.000457 sec)
+   passed  20/34  m-buffer-string (0.000100 sec)
+   passed  21/34  m-with-temp-buffer-of-file (0.000415 sec)
+   passed  22/34  marker-to-pos (0.000103 sec)
+   passed  23/34  match-error (0.000126 sec)
+   passed  24/34  match-n (0.000919 sec)
+   passed  25/34  multi-match (0.000877 sec)
+   passed  26/34  normalize-args (0.000207 sec)
+   passed  27/34  page-matches (0.000288 sec)
+   passed  28/34  paragraph-separate (0.000156 sec)
+   passed  29/34  partition-by-markers (0.000157 sec)
+   passed  30/34  point-stationionary-with-current (0.000291 sec)
+   passed  31/34  replace-matches (0.000567 sec)
+   passed  32/34  replace-point-unmoved (0.000435 sec)
+   passed  33/34  sentence-end (0.000325 sec)
+   passed  34/34  subtract (0.000435 sec)
 
-Ran 34 tests, 34 results as expected, 0 unexpected (2025-03-10 10:56:46+0000, 0.039876 sec)
+Ran 34 tests, 34 results as expected, 0 unexpected (2026-04-12 17:20:23+0000, 0.013946 sec)
 
    create-stamp debian/debhelper-build-stamp
    dh_prep
@@ -720,12 +756,14 @@
 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/77895/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/77895/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/3716 and its subdirectories
-I: Current time: Sun Mar  9 22:56:51 -12 2025
-I: pbuilder-time-stamp: 1741604211
+I: removing directory /srv/workspace/pbuilder/77895 and its subdirectories
+I: Current time: Mon Apr 13 07:20:27 +14 2026
+I: pbuilder-time-stamp: 1776014427