Diff of the two buildlogs:

--
--- b1/build.log	2025-01-20 17:03:41.725616308 +0000
+++ b2/build.log	2025-01-20 17:20:42.839590417 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Jan 20 04:51:27 -12 2025
-I: pbuilder-time-stamp: 1737391887
+I: Current time: Tue Jan 21 07:06:17 +14 2025
+I: pbuilder-time-stamp: 1737392777
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -23,52 +23,84 @@
 dpkg-source: info: unpacking unifont_15.1.01-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/16430/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/829/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64b.
+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 20 17:06 /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/829/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/829/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='643aa81db38d47ec8f87a78ffcc7e46a'
-  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='16430'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=2ede9039fcb448b09a15749dadb94bad
+  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=829
   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.J8vrsmvX/pbuilderrc_Z7fs --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.J8vrsmvX/b1 --logfile b1/build.log unifont_15.1.01-1.dsc'
-  SUDO_GID='112'
-  SUDO_UID='106'
-  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.J8vrsmvX/pbuilderrc_qFUm --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.J8vrsmvX/b2 --logfile b2/build.log unifont_15.1.01-1.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 virt32b 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/16430/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/829/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -219,7 +251,7 @@
 Get: 102 http://deb.debian.org/debian unstable/main armhf x11-common all 1:7.7+23.2 [216 kB]
 Get: 103 http://deb.debian.org/debian unstable/main armhf xfonts-encodings all 1:1.0.4-2.2 [577 kB]
 Get: 104 http://deb.debian.org/debian unstable/main armhf xfonts-utils armhf 1:7.7+7 [84.2 kB]
-Fetched 45.6 MB in 27s (1673 kB/s)
+Fetched 45.6 MB in 9s (4929 kB/s)
 Preconfiguring packages ...
 Selecting previously unselected package tzdata.
 (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 ... 19564 files and directories currently installed.)
@@ -574,8 +606,8 @@
 Setting up tzdata (2025a-1) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Mon Jan 20 16:53:19 UTC 2025.
-Universal Time is now:  Mon Jan 20 16:53:19 UTC 2025.
+Local time is now:      Mon Jan 20 17:09:39 UTC 2025.
+Universal Time is now:  Mon Jan 20 17:09:39 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up libpython3.13-minimal:armhf (3.13.1-3) ...
@@ -672,7 +704,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/unifont-15.1.01/ && 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  > ../unifont_15.1.01-1_source.changes
+I: user script /srv/workspace/pbuilder/829/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/829/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/unifont-15.1.01/ && 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  > ../unifont_15.1.01-1_source.changes
 dpkg-buildpackage: info: source package unifont
 dpkg-buildpackage: info: source version 1:15.1.01-1
 dpkg-buildpackage: info: source distribution unstable
@@ -682,7 +718,7 @@
  debian/rules clean
 dh clean
    dh_auto_clean
-	make -j3 distclean
+	make -j4 distclean
 make[1]: Entering directory '/build/reproducible-path/unifont-15.1.01'
 make -C src  distclean
 make[2]: Entering directory '/build/reproducible-path/unifont-15.1.01/src'
@@ -748,7 +784,7 @@
 make[1]: Entering directory '/build/reproducible-path/unifont-15.1.01'
 dh_auto_build -- CFLAGS='-Wall -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/unifont-15.1.01=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security' CPPFLAGS='-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2' \
    LDFLAGS='-Wl,-z,relro -Wl,-z,now' bindir
-	make -j3 "INSTALL=install --strip-program=true" "CFLAGS=-Wall -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/unifont-15.1.01=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security" "CPPFLAGS=-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2" "LDFLAGS=-Wl,-z,relro -Wl,-z,now" bindir
+	make -j4 "INSTALL=install --strip-program=true" "CFLAGS=-Wall -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/unifont-15.1.01=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security" "CPPFLAGS=-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2" "LDFLAGS=-Wl,-z,relro -Wl,-z,now" bindir
 make[2]: Entering directory '/build/reproducible-path/unifont-15.1.01'
 set -e && make -C src
 make[3]: Entering directory '/build/reproducible-path/unifont-15.1.01/src'
@@ -1305,7 +1341,7 @@
    debian/rules override_dh_auto_install-arch
 make[1]: Entering directory '/build/reproducible-path/unifont-15.1.01'
 dh_auto_install --builddirectory=src -- PREFIX='$(DESTDIR)/usr'
-	cd src && make -j3 install DESTDIR=/build/reproducible-path/unifont-15.1.01/debian/tmp AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true" PREFIX=\$\(DESTDIR\)/usr
+	cd src && make -j4 install DESTDIR=/build/reproducible-path/unifont-15.1.01/debian/tmp AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true" PREFIX=\$\(DESTDIR\)/usr
 make[2]: Entering directory '/build/reproducible-path/unifont-15.1.01/src'
 if [ x/build/reproducible-path/unifont-15.1.01/debian/tmp/usr = x ] ; \
 then \
@@ -1324,7 +1360,7 @@
 install: WARNING: ignoring --strip-program option as -s option was not specified
 make[2]: Leaving directory '/build/reproducible-path/unifont-15.1.01/src'
 dh_auto_install --builddirectory=man -- PREFIX='$(DESTDIR)/usr'
-	cd man && make -j3 install DESTDIR=/build/reproducible-path/unifont-15.1.01/debian/tmp AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true" PREFIX=\$\(DESTDIR\)/usr
+	cd man && make -j4 install DESTDIR=/build/reproducible-path/unifont-15.1.01/debian/tmp AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true" PREFIX=\$\(DESTDIR\)/usr
 make[2]: Entering directory '/build/reproducible-path/unifont-15.1.01/man'
 install -m0755 -d /build/reproducible-path/unifont-15.1.01/debian/tmp/usr/share/man
 install -m0755 -d /build/reproducible-path/unifont-15.1.01/debian/tmp/usr/share/man/man1
@@ -1350,7 +1386,7 @@
 make[2]: Leaving directory '/build/reproducible-path/unifont-15.1.01/man'
 make[1]: Leaving directory '/build/reproducible-path/unifont-15.1.01'
    dh_auto_install -Nunifont-bin
-	make -j3 install DESTDIR=/build/reproducible-path/unifont-15.1.01/debian/tmp AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true"
+	make -j4 install DESTDIR=/build/reproducible-path/unifont-15.1.01/debian/tmp AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true"
 make[1]: Entering directory '/build/reproducible-path/unifont-15.1.01'
 set -e && make -C src
 set -e && make -C doc
@@ -1519,12 +1555,14 @@
 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/829/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/829/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/16430 and its subdirectories
-I: Current time: Mon Jan 20 05:03:37 -12 2025
-I: pbuilder-time-stamp: 1737392617
+I: removing directory /srv/workspace/pbuilder/829 and its subdirectories
+I: Current time: Tue Jan 21 07:20:38 +14 2025
+I: pbuilder-time-stamp: 1737393638