Diff of the two buildlogs:

--
--- b1/build.log	2024-04-09 17:06:07.398938567 +0000
+++ b2/build.log	2024-04-09 17:09:22.174641640 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Apr  9 05:04:53 -12 2024
-I: pbuilder-time-stamp: 1712682293
+I: Current time: Wed Apr 10 07:06:17 +14 2024
+I: pbuilder-time-stamp: 1712682377
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -26,52 +26,84 @@
 dpkg-source: info: unpacking utf8gen_1.1-4.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2290/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/14208/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 Apr  9 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/14208/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/14208/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='trixie'
-  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]="21" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
+  BASH_VERSION='5.2.21(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=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='a58b78da2a64438591e0b7a81d8602ac'
-  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='2290'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=c05ec669b9b248c7a8620162fefc79aa
+  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=14208
   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.R1dlFfso/pbuilderrc_bHrb --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.R1dlFfso/b1 --logfile b1/build.log utf8gen_1.1-4.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.R1dlFfso/pbuilderrc_doSM --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.R1dlFfso/b2 --logfile b2/build.log utf8gen_1.1-4.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 6.1.0-18-armmp-lpae #1 SMP Debian 6.1.76-1 (2024-02-01) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-18-arm64 #1 SMP Debian 6.1.76-1 (2024-02-01) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Apr  7 11:25 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/2290/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr  8 11:24 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/14208/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -148,7 +180,7 @@
 Get: 37 http://deb.debian.org/debian trixie/main armhf tex-common all 6.18 [32.5 kB]
 Get: 38 http://deb.debian.org/debian trixie/main armhf texinfo-lib armhf 7.1-3 [205 kB]
 Get: 39 http://deb.debian.org/debian trixie/main armhf texinfo all 7.1-3 [1748 kB]
-Fetched 20.9 MB in 0s (51.3 MB/s)
+Fetched 20.9 MB in 0s (42.1 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sensible-utils.
 (Reading database ... 
(Reading database ... 5%
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(Reading database ... 60%
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(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19636 files and directories currently installed.)
@@ -329,7 +361,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/utf8gen-1.1/ && 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  > ../utf8gen_1.1-4_source.changes
+I: user script /srv/workspace/pbuilder/14208/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/14208/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/utf8gen-1.1/ && 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  > ../utf8gen_1.1-4_source.changes
 dpkg-buildpackage: info: source package utf8gen
 dpkg-buildpackage: info: source version 1.1-4
 dpkg-buildpackage: info: source distribution unstable
@@ -381,20 +417,20 @@
 config.status: creating src/config.h
 config.status: executing depfiles commands
    dh_auto_build
-	make -j3
+	make -j4
 make[1]: Entering directory '/build/reproducible-path/utf8gen-1.1'
 Making all in doc
 make[2]: Entering directory '/build/reproducible-path/utf8gen-1.1/doc'
 restore=: && backupdir=".am$$" && \
 am__cwd=`pwd` && CDPATH="${ZSH_VERSION+.}:" && cd . && \
 rm -rf $backupdir && mkdir $backupdir && \
-if (/bin/bash '/build/reproducible-path/utf8gen-1.1/build-aux/missing' makeinfo --version) >/dev/null 2>&1; then \
+if (/bin/sh '/build/reproducible-path/utf8gen-1.1/build-aux/missing' makeinfo --version) >/dev/null 2>&1; then \
   for f in utf8gen.info utf8gen.info-[0-9] utf8gen.info-[0-9][0-9] utf8gen.i[0-9] utf8gen.i[0-9][0-9]; do \
     if test -f $f; then mv $f $backupdir; restore=mv; else :; fi; \
   done; \
 else :; fi && \
 cd "$am__cwd"; \
-if /bin/bash '/build/reproducible-path/utf8gen-1.1/build-aux/missing' makeinfo   -I . \
+if /bin/sh '/build/reproducible-path/utf8gen-1.1/build-aux/missing' makeinfo   -I . \
  -o utf8gen.info utf8gen.texi; \
 then \
   rc=0; \
@@ -427,7 +463,7 @@
 make[2]: Leaving directory '/build/reproducible-path/utf8gen-1.1'
 make[1]: Leaving directory '/build/reproducible-path/utf8gen-1.1'
    dh_auto_test
-	make -j3 check "TESTSUITEFLAGS=-j3 --verbose" VERBOSE=1
+	make -j4 check "TESTSUITEFLAGS=-j4 --verbose" VERBOSE=1
 make[1]: Entering directory '/build/reproducible-path/utf8gen-1.1'
 Making check in doc
 make[2]: Entering directory '/build/reproducible-path/utf8gen-1.1/doc'
@@ -451,9 +487,9 @@
 make  check-TESTS
 make[3]: Entering directory '/build/reproducible-path/utf8gen-1.1/test'
 make[4]: Entering directory '/build/reproducible-path/utf8gen-1.1/test'
-PASS: test2
 PASS: test1
 PASS: test3
+PASS: test2
 ============================================================================
 Testsuite summary for utf8gen 1.1
 ============================================================================
@@ -475,7 +511,7 @@
    create-stamp debian/debhelper-build-stamp
    dh_prep
    dh_auto_install --destdir=debian/utf8gen/
-	make -j3 install DESTDIR=/build/reproducible-path/utf8gen-1.1/debian/utf8gen AM_UPDATE_INFO_DIR=no
+	make -j4 install DESTDIR=/build/reproducible-path/utf8gen-1.1/debian/utf8gen AM_UPDATE_INFO_DIR=no
 make[1]: Entering directory '/build/reproducible-path/utf8gen-1.1'
 Making install in doc
 make[2]: Entering directory '/build/reproducible-path/utf8gen-1.1/doc'
@@ -496,8 +532,8 @@
 Making install in src
 make[2]: Entering directory '/build/reproducible-path/utf8gen-1.1/src'
 make[3]: Entering directory '/build/reproducible-path/utf8gen-1.1/src'
-make[3]: Nothing to be done for 'install-data-am'.
  /usr/bin/mkdir -p '/build/reproducible-path/utf8gen-1.1/debian/utf8gen/usr/bin'
+make[3]: Nothing to be done for 'install-data-am'.
   /usr/bin/install -c utf8gen '/build/reproducible-path/utf8gen-1.1/debian/utf8gen/usr/bin'
 make[3]: Leaving directory '/build/reproducible-path/utf8gen-1.1/src'
 make[2]: Leaving directory '/build/reproducible-path/utf8gen-1.1/src'
@@ -535,8 +571,8 @@
    dh_gencontrol
    dh_md5sums
    dh_builddeb
-dpkg-deb: building package 'utf8gen' in '../utf8gen_1.1-4_armhf.deb'.
 dpkg-deb: building package 'utf8gen-dbgsym' in '../utf8gen-dbgsym_1.1-4_armhf.deb'.
+dpkg-deb: building package 'utf8gen' in '../utf8gen_1.1-4_armhf.deb'.
  dpkg-genbuildinfo --build=binary -O../utf8gen_1.1-4_armhf.buildinfo
  dpkg-genchanges --build=binary -O../utf8gen_1.1-4_armhf.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -544,12 +580,14 @@
 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/14208/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/14208/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/2290 and its subdirectories
-I: Current time: Tue Apr  9 05:06:03 -12 2024
-I: pbuilder-time-stamp: 1712682363
+I: removing directory /srv/workspace/pbuilder/14208 and its subdirectories
+I: Current time: Wed Apr 10 07:09:17 +14 2024
+I: pbuilder-time-stamp: 1712682557