Diff of the two buildlogs:

--
--- b1/build.log	2024-07-15 07:30:04.417835544 +0000
+++ b2/build.log	2024-07-15 07:31:15.806797418 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Jul 14 19:28:52 -12 2024
-I: pbuilder-time-stamp: 1721028532
+I: Current time: Mon Jul 15 21:30:18 +14 2024
+I: pbuilder-time-stamp: 1721028618
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking libmail-chimp3-perl_0.08-2.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/10196/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/12389/tmp/hooks/D01_modify_environment starting
+debug: Running on virt32z.
+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 Jul 15 07:30 /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/12389/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/12389/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]="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=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='212eebf4d9874fec9daae4f4b1b63726'
-  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='10196'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=d252d3be26b547738b6650cb20841ccf
+  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=12389
   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.FnX4g192/pbuilderrc_OEAL --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.FnX4g192/b1 --logfile b1/build.log libmail-chimp3-perl_0.08-2.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.FnX4g192/pbuilderrc_bVmW --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.FnX4g192/b2 --logfile b2/build.log libmail-chimp3-perl_0.08-2.dsc'
+  SUDO_GID=110
+  SUDO_UID=103
+  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 virt64b 6.1.0-22-arm64 #1 SMP Debian 6.1.94-1 (2024-06-21) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-22-armmp-lpae #1 SMP Debian 6.1.94-1 (2024-06-21) armv7l GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Jun  5 22:35 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/10196/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/12389/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -214,7 +246,7 @@
 Get: 94 http://deb.debian.org/debian unstable/main armhf libxml-libxml-perl armhf 2.0207+dfsg+really+2.0134-4 [298 kB]
 Get: 95 http://deb.debian.org/debian unstable/main armhf libxml-simple-perl all 2.25-2 [69.8 kB]
 Get: 96 http://deb.debian.org/debian unstable/main armhf libweb-api-perl all 2.8-1 [17.8 kB]
-Fetched 23.8 MB in 1s (17.9 MB/s)
+Fetched 23.8 MB in 0s (48.5 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package netbase.
 (Reading database ... 
(Reading database ... 5%
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(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19407 files and directories currently installed.)
@@ -629,7 +661,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/libmail-chimp3-perl-0.08/ && 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  > ../libmail-chimp3-perl_0.08-2_source.changes
+I: user script /srv/workspace/pbuilder/12389/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/12389/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/libmail-chimp3-perl-0.08/ && 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  > ../libmail-chimp3-perl_0.08-2_source.changes
 dpkg-buildpackage: info: source package libmail-chimp3-perl
 dpkg-buildpackage: info: source version 0.08-2
 dpkg-buildpackage: info: source distribution unstable
@@ -651,13 +687,13 @@
 Writing Makefile for Mail::Chimp3
 Writing MYMETA.yml and MYMETA.json
    dh_auto_build
-	make -j3
+	make -j4
 make[1]: Entering directory '/build/reproducible-path/libmail-chimp3-perl-0.08'
 cp lib/Mail/Chimp3.pm blib/lib/Mail/Chimp3.pm
 Manifying 1 pod document
 make[1]: Leaving directory '/build/reproducible-path/libmail-chimp3-perl-0.08'
    dh_auto_test
-	make -j3 test TEST_VERBOSE=1
+	make -j4 test TEST_VERBOSE=1
 make[1]: Entering directory '/build/reproducible-path/libmail-chimp3-perl-0.08'
 PERL_DL_NONLAZY=1 "/usr/bin/perl" "-MExtUtils::Command::MM" "-MTest::Harness" "-e" "undef *Test::Harness::Switches; test_harness(1, 'blib/lib', 'blib/arch')" t/*.t
 t/01_load.t .............. 
@@ -675,13 +711,13 @@
 t/author-pod-coverage.t .. skipped: these tests are for testing by the author
 t/author-pod-syntax.t .... skipped: these tests are for testing by the author
 All tests successful.
-Files=6, Tests=4,  2 wallclock secs ( 0.06 usr  0.02 sys +  1.60 cusr  0.16 csys =  1.84 CPU)
+Files=6, Tests=4,  2 wallclock secs ( 0.04 usr  0.05 sys +  1.15 cusr  0.18 csys =  1.42 CPU)
 Result: PASS
 make[1]: Leaving directory '/build/reproducible-path/libmail-chimp3-perl-0.08'
    create-stamp debian/debhelper-build-stamp
    dh_prep
    dh_auto_install --destdir=debian/libmail-chimp3-perl/
-	make -j3 install DESTDIR=/build/reproducible-path/libmail-chimp3-perl-0.08/debian/libmail-chimp3-perl AM_UPDATE_INFO_DIR=no PREFIX=/usr
+	make -j4 install DESTDIR=/build/reproducible-path/libmail-chimp3-perl-0.08/debian/libmail-chimp3-perl AM_UPDATE_INFO_DIR=no PREFIX=/usr
 make[1]: Entering directory '/build/reproducible-path/libmail-chimp3-perl-0.08'
 Manifying 1 pod document
 Installing /build/reproducible-path/libmail-chimp3-perl-0.08/debian/libmail-chimp3-perl/usr/share/perl5/Mail/Chimp3.pm
@@ -708,12 +744,14 @@
 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/12389/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/12389/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/10196 and its subdirectories
-I: Current time: Sun Jul 14 19:30:00 -12 2024
-I: pbuilder-time-stamp: 1721028600
+I: removing directory /srv/workspace/pbuilder/12389 and its subdirectories
+I: Current time: Mon Jul 15 21:31:12 +14 2024
+I: pbuilder-time-stamp: 1721028672