Diff of the two buildlogs:

--
--- b1/build.log	2025-04-20 02:50:00.197754877 +0000
+++ b2/build.log	2025-04-20 02:51:20.016062736 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Apr 19 14:48:48 -12 2025
-I: pbuilder-time-stamp: 1745117328
+I: Current time: Sun Apr 20 16:50:08 +14 2025
+I: pbuilder-time-stamp: 1745117408
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking csv-mode_1.27-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/17781/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/19029/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64c.
+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 20 02:50 /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/19029/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/19029/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=3 '
-  DISTRIBUTION='unstable'
-  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]="37" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
+  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=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=4 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='37409c82a166494e9940b8fec4d88331'
-  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='17781'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=164a9104b33a4ea88e644cad877e24d2
+  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=19029
   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.XihAuIcX/pbuilderrc_dvF4 --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.XihAuIcX/b1 --logfile b1/build.log csv-mode_1.27-1.dsc'
-  SUDO_GID='113'
-  SUDO_UID='107'
-  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.XihAuIcX/pbuilderrc_ETQY --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.XihAuIcX/b2 --logfile b2/build.log csv-mode_1.27-1.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 virt32a 6.1.0-33-armmp-lpae #1 SMP Debian 6.1.133-1 (2025-04-10) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-33-arm64 #1 SMP Debian 6.1.133-1 (2025-04-10) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Mar  4 11:20 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/17781/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/19029/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: 93 http://deb.debian.org/debian unstable/main armhf libtext-glob-perl all 0.11-3 [7676 B]
 Get: 94 http://deb.debian.org/debian unstable/main armhf libfile-find-rule-perl all 0.34-3 [26.6 kB]
 Get: 95 http://deb.debian.org/debian unstable/main armhf dh-elpa all 2.1.9 [30.5 kB]
-Fetched 67.6 MB in 1s (62.9 MB/s)
+Fetched 67.6 MB in 1s (48.1 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 ... 19566 files and directories currently installed.)
@@ -610,7 +642,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/csv-mode-1.27/ && 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  > ../csv-mode_1.27-1_source.changes
+I: user script /srv/workspace/pbuilder/19029/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/19029/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/csv-mode-1.27/ && 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  > ../csv-mode_1.27-1_source.changes
 dpkg-buildpackage: info: source package csv-mode
 dpkg-buildpackage: info: source version 1.27-1
 dpkg-buildpackage: info: source distribution unstable
@@ -626,23 +662,23 @@
    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\")" --eval "(setq ert-batch-backtrace-right-margin nil)" -f package-initialize -L . -l csv-mode-tests.el -f ert-run-tests-batch-and-exit
-Running 13 tests (2025-04-20 02:49:46+0000, selector `t')
-   passed   1/13  csv-tests-align-fields (0.000840 sec)
-   passed   2/13  csv-tests-align-fields-double-quote-comma (0.000561 sec)
-   passed   3/13  csv-tests-align-fields-with-quotes (0.000547 sec)
-   passed   4/13  csv-tests-beginning-of-field (0.000566 sec)
-   passed   5/13  csv-tests-beginning-of-field-with-quotes (0.000448 sec)
-   passed   6/13  csv-tests-end-of-field (0.000437 sec)
-   passed   7/13  csv-tests-end-of-field-unclosed-quotes (0.000488 sec)
-   passed   8/13  csv-tests-end-of-field-with-quotes (0.000480 sec)
-   passed   9/13  csv-tests-guess-separator (0.004888 sec)
+Running 13 tests (2025-04-20 02:51:08+0000, selector `t')
+   passed   1/13  csv-tests-align-fields (0.000649 sec)
+   passed   2/13  csv-tests-align-fields-double-quote-comma (0.000534 sec)
+   passed   3/13  csv-tests-align-fields-with-quotes (0.000492 sec)
+   passed   4/13  csv-tests-beginning-of-field (0.000509 sec)
+   passed   5/13  csv-tests-beginning-of-field-with-quotes (0.000436 sec)
+   passed   6/13  csv-tests-end-of-field (0.000421 sec)
+   passed   7/13  csv-tests-end-of-field-unclosed-quotes (0.000462 sec)
+   passed   8/13  csv-tests-end-of-field-with-quotes (0.000453 sec)
+   passed   9/13  csv-tests-guess-separator (0.004078 sec)
 Guessed separator: ;
-   passed  10/13  csv-tests-guess-separator-avoid-comment (0.001852 sec)
-   passed  11/13  csv-tests-separator-candidates (0.001724 sec)
-   passed  12/13  csv-tests-separator-score (0.002186 sec)
-   passed  13/13  csv-tests-unquote-value (0.000508 sec)
+   passed  10/13  csv-tests-guess-separator-avoid-comment (0.001729 sec)
+   passed  11/13  csv-tests-separator-candidates (0.001555 sec)
+   passed  12/13  csv-tests-separator-score (0.001808 sec)
+   passed  13/13  csv-tests-unquote-value (0.000443 sec)
 
-Ran 13 tests, 13 results as expected, 0 unexpected (2025-04-20 02:49:46+0000, 0.018267 sec)
+Ran 13 tests, 13 results as expected, 0 unexpected (2025-04-20 02:51:08+0000, 0.016000 sec)
 
    create-stamp debian/debhelper-build-stamp
    dh_prep
@@ -668,12 +704,14 @@
 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/19029/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/19029/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/17781 and its subdirectories
-I: Current time: Sat Apr 19 14:49:56 -12 2025
-I: pbuilder-time-stamp: 1745117396
+I: removing directory /srv/workspace/pbuilder/19029 and its subdirectories
+I: Current time: Sun Apr 20 16:51:16 +14 2025
+I: pbuilder-time-stamp: 1745117476