Diff of the two buildlogs:

--
--- b1/build.log	2025-01-22 06:55:10.426440478 +0000
+++ b2/build.log	2025-01-22 07:04:57.267876498 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Jan 21 18:52:02 -12 2025
-I: pbuilder-time-stamp: 1737528722
+I: Current time: Wed Jan 22 20:55:26 +14 2025
+I: pbuilder-time-stamp: 1737528926
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/experimental-reproducible-base.tgz]
 I: copying local configuration
@@ -32,52 +32,84 @@
 dpkg-source: info: applying rlfe-signal-rvt.diff
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3127/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/26569/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64a.
+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 Jan 22 06:55 /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/26569/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/26569/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='experimental'
-  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=experimental
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='ad1b6c014d6649f7bda363e6ea703170'
-  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='3127'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=3506cbd7e06b4485a145ee814784c72a
+  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=26569
   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.7vWv0Pth/pbuilderrc_hvYi --distribution experimental --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/experimental-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.7vWv0Pth/b1 --logfile b1/build.log readline_8.3~beta1-1.dsc'
-  SUDO_GID='110'
-  SUDO_UID='103'
-  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.7vWv0Pth/pbuilderrc_qzBA --distribution experimental --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/experimental-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.7vWv0Pth/b2 --logfile b2/build.log readline_8.3~beta1-1.dsc'
+  SUDO_GID=114
+  SUDO_UID=108
+  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 virt32z 6.1.0-30-armmp-lpae #1 SMP Debian 6.1.124-1 (2025-01-12) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-30-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3127/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/26569/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -162,7 +194,7 @@
 Get: 43 http://deb.debian.org/debian unstable/main armhf tex-common all 6.18 [32.5 kB]
 Get: 44 http://deb.debian.org/debian unstable/main armhf texinfo-lib armhf 7.1.1-1+b1 [209 kB]
 Get: 45 http://deb.debian.org/debian unstable/main armhf texinfo all 7.1.1-1 [1753 kB]
-Fetched 23.6 MB in 2s (11.3 MB/s)
+Fetched 23.6 MB in 1s (23.3 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libproc2-0: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 ... 19563 files and directories currently installed.)
@@ -371,7 +403,11 @@
 fakeroot is already the newest version (1.36.2-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/readline-8.3~beta1/ && 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  > ../readline_8.3~beta1-1_source.changes
+I: user script /srv/workspace/pbuilder/26569/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for experimental
+I: user script /srv/workspace/pbuilder/26569/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/readline-8.3~beta1/ && 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  > ../readline_8.3~beta1-1_source.changes
 dpkg-buildpackage: info: source package readline
 dpkg-buildpackage: info: source version 8.3~beta1-1
 dpkg-buildpackage: info: source distribution experimental
@@ -404,7 +440,7 @@
 	--prefix=/usr\
 	--host=arm-linux-gnueabihf \
 	--libdir=/usr/lib/arm-linux-gnueabihf
-checking build system type... armv7l-unknown-linux-gnueabihf
+checking build system type... aarch64-unknown-linux-gnu
 checking host system type... arm-unknown-linux-gnueabihf
 
 Beginning configuration for readline-8.3 for arm-unknown-linux-gnueabihf
@@ -568,7 +604,7 @@
 	--prefix=/usr\
 	--host=arm-linux-gnueabihf \
 	--libdir=/usr/lib/arm-linux-gnueabihf
-checking build system type... armv7l-unknown-linux-gnueabihf
+checking build system type... aarch64-unknown-linux-gnu
 checking host system type... arm-unknown-linux-gnueabihf
 
 Beginning configuration for readline-8.3 for arm-unknown-linux-gnueabihf
@@ -1383,8 +1419,8 @@
   mv -f debian/libreadline-dev/usr/include/readline/chardefs.h.new \
     debian/libreadline-dev/usr/include/readline/chardefs.h; \
 fi
---- debian/libreadline-dev/usr/include/readline/chardefs.h	2025-01-22 06:54:51.567650461 +0000
-+++ debian/libreadline-dev/usr/include/readline/chardefs.h.new	2025-01-22 06:54:52.435618751 +0000
+--- debian/libreadline-dev/usr/include/readline/chardefs.h	2025-01-22 07:04:11.082320886 +0000
++++ debian/libreadline-dev/usr/include/readline/chardefs.h.new	2025-01-22 07:04:15.001955218 +0000
 @@ -24,16 +24,7 @@
  
  #include <ctype.h>
@@ -1565,8 +1601,8 @@
 dh_gencontrol: warning: Use of debian/compat is deprecated and will be removed in debhelper (>= 14~).
 dh_md5sums -i
 dh_builddeb -i
-dpkg-deb: building package 'readline-common' in '../readline-common_8.3~beta1-1_all.deb'.
 dpkg-deb: building package 'readline-doc' in '../readline-doc_8.3~beta1-1_all.deb'.
+dpkg-deb: building package 'readline-common' in '../readline-common_8.3~beta1-1_all.deb'.
 dpkg-deb: building package 'readline-common-udeb' in 'debian/.debhelper/scratch-space/build-readline-common-udeb/readline-common-udeb_8.3~beta1-1_all.deb'.
 	Renaming readline-common-udeb_8.3~beta1-1_all.deb to readline-common-udeb_8.3~beta1-1_all.udeb
 sed 's/#DEB_HOST_MULTIARCH#/arm-linux-gnueabihf/g' debian/libreadline8t64.preinst.in > debian/libreadline8t64.preinst
@@ -1617,9 +1653,9 @@
 dpkg-deb: building package 'rlfe' in '../rlfe_8.3~beta1-1_armhf.deb'.
 dpkg-deb: building package 'libreadline8-udeb' in 'debian/.debhelper/scratch-space/build-libreadline8-udeb/libreadline8-udeb_8.3~beta1-1_armhf.deb'.
 dpkg-deb: building package 'rlfe-dbgsym' in '../rlfe-dbgsym_8.3~beta1-1_armhf.deb'.
+dpkg-deb: building package 'libreadline8t64-dbgsym' in '../libreadline8t64-dbgsym_8.3~beta1-1_armhf.deb'.
 	Renaming libreadline8-udeb_8.3~beta1-1_armhf.deb to libreadline8-udeb_8.3~beta1-1_armhf.udeb
 dpkg-deb: building package 'libreadline-dev' in '../libreadline-dev_8.3~beta1-1_armhf.deb'.
-dpkg-deb: building package 'libreadline8t64-dbgsym' in '../libreadline8t64-dbgsym_8.3~beta1-1_armhf.deb'.
  dpkg-genbuildinfo --build=binary -O../readline_8.3~beta1-1_armhf.buildinfo
  dpkg-genchanges --build=binary -O../readline_8.3~beta1-1_armhf.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -1627,12 +1663,14 @@
 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/26569/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/26569/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/3127 and its subdirectories
-I: Current time: Tue Jan 21 18:55:06 -12 2025
-I: pbuilder-time-stamp: 1737528906
+I: removing directory /srv/workspace/pbuilder/26569 and its subdirectories
+I: Current time: Wed Jan 22 21:04:51 +14 2025
+I: pbuilder-time-stamp: 1737529492