Diff of the two buildlogs:

--
--- b1/build.log	2025-01-14 05:37:45.095331260 +0000
+++ b2/build.log	2025-01-14 05:38:24.277543611 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Feb 16 00:00:22 -12 2026
-I: pbuilder-time-stamp: 1771243222
+I: Current time: Tue Jan 14 19:37:47 +14 2025
+I: pbuilder-time-stamp: 1736833067
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -25,54 +25,86 @@
 dpkg-source: info: applying auto-gitignore
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/72277/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1825/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos12-i386.
+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 14 05:37 /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/1825/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1825/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='i386'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=22 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='i386'
+  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]="i686-pc-linux-gnu")
+  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=i386
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=10 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=i686
+  HOST_ARCH=i386
   IFS=' 	
   '
-  INVOCATION_ID='5231701f66f74071b467fedfb98ce7e5'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  LD_LIBRARY_PATH='/usr/lib/libeatmydata'
-  LD_PRELOAD='libeatmydata.so'
-  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='72277'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=7663514437b54d92b8ccbf8a46153236
+  LANG=C
+  LANGUAGE=de_CH:de
+  LC_ALL=C
+  LD_LIBRARY_PATH=/usr/lib/libeatmydata
+  LD_PRELOAD=libeatmydata.so
+  MACHTYPE=i686-pc-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=1825
   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.7Osf7Blj/pbuilderrc_95z4 --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.7Osf7Blj/b1 --logfile b1/build.log libdatetime-format-rfc3339-perl_1.10.0-1.dsc'
-  SUDO_GID='112'
-  SUDO_UID='107'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://213.165.73.152:3128'
+  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.7Osf7Blj/pbuilderrc_2VLx --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.7Osf7Blj/b2 --logfile b2/build.log libdatetime-format-rfc3339-perl_1.10.0-1.dsc'
+  SUDO_GID=112
+  SUDO_UID=107
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://46.16.76.132:3128
 I: uname -a
-  Linux ionos6-i386 6.1.0-29-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.123-1 (2025-01-02) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-29-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.123-1 (2025-01-02) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/72277/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/1825/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -180,7 +212,7 @@
 Get: 68 http://deb.debian.org/debian unstable/main i386 libdatetime-locale-perl all 1:1.41-1 [3131 kB]
 Get: 69 http://deb.debian.org/debian unstable/main i386 libdatetime-timezone-perl all 1:2.63-2+2024b [261 kB]
 Get: 70 http://deb.debian.org/debian unstable/main i386 libdatetime-perl i386 2:1.65-1+b2 [119 kB]
-Fetched 25.2 MB in 0s (120 MB/s)
+Fetched 25.2 MB in 0s (71.1 MB/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 ... 19835 files and directories currently installed.)
@@ -416,8 +448,8 @@
 Setting up tzdata (2024b-6) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Mon Feb 16 12:00:37 UTC 2026.
-Universal Time is now:  Mon Feb 16 12:00:37 UTC 2026.
+Local time is now:      Tue Jan 14 05:38:12 UTC 2025.
+Universal Time is now:  Tue Jan 14 05:38:12 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -481,7 +513,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/libdatetime-format-rfc3339-perl-1.10.0/ && 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  > ../libdatetime-format-rfc3339-perl_1.10.0-1_source.changes
+I: user script /srv/workspace/pbuilder/1825/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/1825/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/libdatetime-format-rfc3339-perl-1.10.0/ && 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  > ../libdatetime-format-rfc3339-perl_1.10.0-1_source.changes
 dpkg-buildpackage: info: source package libdatetime-format-rfc3339-perl
 dpkg-buildpackage: info: source version 1.10.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -505,13 +541,13 @@
 Writing Makefile for DateTime::Format::RFC3339
 Writing MYMETA.yml and MYMETA.json
    dh_auto_build
-	make -j22
+	make -j10
 make[1]: Entering directory '/build/reproducible-path/libdatetime-format-rfc3339-perl-1.10.0'
 cp lib/DateTime/Format/RFC3339.pm blib/lib/DateTime/Format/RFC3339.pm
 Manifying 1 pod document
 make[1]: Leaving directory '/build/reproducible-path/libdatetime-format-rfc3339-perl-1.10.0'
    dh_auto_test
-	make -j22 test TEST_VERBOSE=1
+	make -j10 test TEST_VERBOSE=1
 make[1]: Entering directory '/build/reproducible-path/libdatetime-format-rfc3339-perl-1.10.0'
 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
 # Testing DateTime::Format::RFC3339 v1.10.0
@@ -726,13 +762,13 @@
 ok 20 - sep => ' '
 ok
 All tests successful.
-Files=9, Tests=32,  1 wallclock secs ( 0.02 usr  0.02 sys +  0.98 cusr  0.06 csys =  1.08 CPU)
+Files=9, Tests=32,  2 wallclock secs ( 0.06 usr  0.02 sys +  1.76 cusr  0.14 csys =  1.98 CPU)
 Result: PASS
 make[1]: Leaving directory '/build/reproducible-path/libdatetime-format-rfc3339-perl-1.10.0'
    create-stamp debian/debhelper-build-stamp
    dh_prep
    dh_auto_install --destdir=debian/libdatetime-format-rfc3339-perl/
-	make -j22 install DESTDIR=/build/reproducible-path/libdatetime-format-rfc3339-perl-1.10.0/debian/libdatetime-format-rfc3339-perl AM_UPDATE_INFO_DIR=no PREFIX=/usr
+	make -j10 install DESTDIR=/build/reproducible-path/libdatetime-format-rfc3339-perl-1.10.0/debian/libdatetime-format-rfc3339-perl AM_UPDATE_INFO_DIR=no PREFIX=/usr
 make[1]: Entering directory '/build/reproducible-path/libdatetime-format-rfc3339-perl-1.10.0'
 Manifying 1 pod document
 Installing /build/reproducible-path/libdatetime-format-rfc3339-perl-1.10.0/debian/libdatetime-format-rfc3339-perl/usr/share/perl5/DateTime/Format/RFC3339.pm
@@ -759,12 +795,14 @@
 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/1825/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1825/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/72277 and its subdirectories
-I: Current time: Mon Feb 16 00:00:43 -12 2026
-I: pbuilder-time-stamp: 1771243243
+I: removing directory /srv/workspace/pbuilder/1825 and its subdirectories
+I: Current time: Tue Jan 14 19:38:23 +14 2025
+I: pbuilder-time-stamp: 1736833103