Diff of the two buildlogs:

--
--- b1/build.log	2023-04-20 08:56:24.903361881 +0000
+++ b2/build.log	2023-04-20 08:57:38.104114244 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Apr 19 20:55:18 -12 2023
-I: pbuilder-time-stamp: 1681980918
+I: Current time: Thu May 23 05:19:28 +14 2024
+I: pbuilder-time-stamp: 1716391168
 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 [./esmtp_1.2.orig.tar.bz2]
 I: copying [./esmtp_1.2-18.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Sun Oct 24 01:15:56 2021 -12
+gpgv: Signature made Mon Oct 25 03:15:56 2021 +14
 gpgv:                using RSA key 4644409808C171E05531DDEE054CB8F31343CF44
 gpgv:                issuer "carnil@debian.org"
 gpgv: Can't check signature: No public key
@@ -31,52 +31,84 @@
 dpkg-source: info: applying fix-segfault-on-empty-to-in-headers.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/23256/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/25641/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink13-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 May 23 05:19 /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/25641/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/25641/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='23256'
-  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=25641
   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.UT4rGLvR/pbuilderrc_ek2W --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.UT4rGLvR/b1 --logfile b1/build.log esmtp_1.2-18.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.UT4rGLvR/pbuilderrc_KR3Y --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.UT4rGLvR/b2 --logfile b2/build.log --extrapackages usrmerge esmtp_1.2-18.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 codethink12-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 Apr 17 22:25 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/23256/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 20 06:47 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/25641/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -163,7 +195,7 @@
 Get: 37 http://deb.debian.org/debian bookworm/main arm64 pkgconf-bin arm64 1.8.1-1 [28.9 kB]
 Get: 38 http://deb.debian.org/debian bookworm/main arm64 pkgconf arm64 1.8.1-1 [25.9 kB]
 Get: 39 http://deb.debian.org/debian bookworm/main arm64 pkg-config arm64 1.8.1-1 [13.7 kB]
-Fetched 22.4 MB in 1s (32.6 MB/s)
+Fetched 22.4 MB in 0s (44.9 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package m4.
 (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.)
@@ -334,8 +366,17 @@
 Writing extended state information...
 Building tag database...
  -> Finished parsing the build-deps
+Reading package lists...
+Building dependency tree...
+Reading state information...
+usrmerge is already the newest version (35).
+0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/esmtp-1.2/ && 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  > ../esmtp_1.2-18_source.changes
+I: user script /srv/workspace/pbuilder/25641/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/25641/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/esmtp-1.2/ && 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  > ../esmtp_1.2-18_source.changes
 dpkg-buildpackage: info: source package esmtp
 dpkg-buildpackage: info: source version 1.2-18
 dpkg-buildpackage: info: source distribution unstable
@@ -456,25 +497,25 @@
  /usr/bin/mkdir -p '/build/esmtp-1.2/debian/tmp/usr/share/man/man5'
   /usr/bin/install -c esmtp '/build/esmtp-1.2/debian/tmp/usr/bin'
 make  install-exec-hook
- /usr/bin/install -c -m 644 esmtp.1 '/build/esmtp-1.2/debian/tmp/usr/share/man/man1'
 make[4]: Entering directory '/build/esmtp-1.2'
-/bin/bash /build/esmtp-1.2/install-sh -d /build/esmtp-1.2/debian/tmp/usr/sbin /build/esmtp-1.2/debian/tmp/usr/lib/aarch64-linux-gnu
+/bin/sh /build/esmtp-1.2/install-sh -d /build/esmtp-1.2/debian/tmp/usr/sbin /build/esmtp-1.2/debian/tmp/usr/lib/aarch64-linux-gnu
+ /usr/bin/install -c -m 644 esmtp.1 '/build/esmtp-1.2/debian/tmp/usr/share/man/man1'
  /usr/bin/install -c -m 644 esmtprc.5 '/build/esmtp-1.2/debian/tmp/usr/share/man/man5'
 make  install-data-hook
 make[4]: Entering directory '/build/esmtp-1.2'
 rm -f /build/esmtp-1.2/debian/tmp/usr/share/man/man1/sendmail.1
-rm -f /build/esmtp-1.2/debian/tmp/usr/share/man/man1/mailq.1
-rm -f /build/esmtp-1.2/debian/tmp/usr/share/man/man1/newaliases.1
-ln -s esmtp.1 /build/esmtp-1.2/debian/tmp/usr/share/man/man1/sendmail.1
-ln -s esmtp.1 /build/esmtp-1.2/debian/tmp/usr/share/man/man1/mailq.1
 rm -f /build/esmtp-1.2/debian/tmp/usr/sbin/sendmail
-ln -s esmtp.1 /build/esmtp-1.2/debian/tmp/usr/share/man/man1/newaliases.1
+rm -f /build/esmtp-1.2/debian/tmp/usr/share/man/man1/mailq.1
 rm -f /build/esmtp-1.2/debian/tmp/usr/lib/aarch64-linux-gnu/sendmail
-make[4]: Leaving directory '/build/esmtp-1.2'
+rm -f /build/esmtp-1.2/debian/tmp/usr/share/man/man1/newaliases.1
 rm -f /build/esmtp-1.2/debian/tmp/usr/bin/mailq
+ln -s esmtp.1 /build/esmtp-1.2/debian/tmp/usr/share/man/man1/sendmail.1
 rm -f /build/esmtp-1.2/debian/tmp/usr/bin/newaliases
+ln -s esmtp.1 /build/esmtp-1.2/debian/tmp/usr/share/man/man1/mailq.1
 ln -s /usr/bin/esmtp /build/esmtp-1.2/debian/tmp/usr/sbin/sendmail
 ln -s /usr/bin/esmtp /build/esmtp-1.2/debian/tmp/usr/lib/aarch64-linux-gnu/sendmail
+ln -s esmtp.1 /build/esmtp-1.2/debian/tmp/usr/share/man/man1/newaliases.1
+make[4]: Leaving directory '/build/esmtp-1.2'
 ln -s /usr/bin/esmtp /build/esmtp-1.2/debian/tmp/usr/bin/mailq
 ln -s /usr/bin/esmtp /build/esmtp-1.2/debian/tmp/usr/bin/newaliases
 make[4]: Leaving directory '/build/esmtp-1.2'
@@ -504,8 +545,8 @@
    dh_gencontrol
    dh_md5sums
    dh_builddeb
-dpkg-deb: building package 'esmtp' in '../esmtp_1.2-18_arm64.deb'.
 dpkg-deb: building package 'esmtp-run' in '../esmtp-run_1.2-18_all.deb'.
+dpkg-deb: building package 'esmtp' in '../esmtp_1.2-18_arm64.deb'.
 dpkg-deb: building package 'esmtp-dbgsym' in '../esmtp-dbgsym_1.2-18_arm64.deb'.
  dpkg-genbuildinfo --build=binary -O../esmtp_1.2-18_arm64.buildinfo
  dpkg-genchanges --build=binary -O../esmtp_1.2-18_arm64.changes
@@ -514,12 +555,14 @@
 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/25641/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/25641/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/23256 and its subdirectories
-I: Current time: Wed Apr 19 20:56:23 -12 2023
-I: pbuilder-time-stamp: 1681980983
+I: removing directory /srv/workspace/pbuilder/25641 and its subdirectories
+I: Current time: Thu May 23 05:20:36 +14 2024
+I: pbuilder-time-stamp: 1716391237