Diff of the two buildlogs:

--
--- b1/build.log	2025-01-30 20:36:26.022607620 +0000
+++ b2/build.log	2025-01-30 20:40:15.908292615 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Jan 30 08:34:48 -12 2025
-I: pbuilder-time-stamp: 1738269288
+I: Current time: Fri Jan 31 10:36:37 +14 2025
+I: pbuilder-time-stamp: 1738269397
 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: applying 0002-Skip-test-with-invalid-domain.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/7446/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1921/tmp/hooks/D01_modify_environment starting
+debug: Running on ff64a.
+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 30 20:37 /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/1921/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1921/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=6 '
+  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='10aaa02d76c2466a80f8c56978ccf165'
-  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='7446'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=c326d19bc2f84b97b89b49b038667ae5
+  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=1921
   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.84Gi0Hmy/pbuilderrc_C5SG --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.84Gi0Hmy/b1 --logfile b1/build.log ruby-rack-test_2.2.0-1.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.84Gi0Hmy/pbuilderrc_ysS0 --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.84Gi0Hmy/b2 --logfile b2/build.log ruby-rack-test_2.2.0-1.dsc'
+  SUDO_GID=114
+  SUDO_UID=109
+  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/7446/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/1921/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -272,7 +304,7 @@
 Get: 150 http://deb.debian.org/debian unstable/main armhf ruby-tilt all 2.4.0-3 [32.2 kB]
 Get: 151 http://deb.debian.org/debian unstable/main armhf ruby-sinatra all 4.1.1-3 [122 kB]
 Get: 152 http://deb.debian.org/debian unstable/main armhf ruby-thor all 1.3.2-1 [49.3 kB]
-Fetched 53.7 MB in 6s (8994 kB/s)
+Fetched 53.7 MB in 2s (28.9 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.13-minimal: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 ... 19567 files and directories currently installed.)
@@ -776,8 +808,8 @@
 Setting up tzdata (2025a-1) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Thu Jan 30 20:35:43 UTC 2025.
-Universal Time is now:  Thu Jan 30 20:35:43 UTC 2025.
+Local time is now:      Thu Jan 30 20:38:43 UTC 2025.
+Universal Time is now:  Thu Jan 30 20:38:43 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up ruby-minitest (5.25.4-1) ...
@@ -915,7 +947,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/ruby-rack-test-2.2.0/ && 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  > ../ruby-rack-test_2.2.0-1_source.changes
+I: user script /srv/workspace/pbuilder/1921/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/1921/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/ruby-rack-test-2.2.0/ && 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  > ../ruby-rack-test_2.2.0-1_source.changes
 dpkg-buildpackage: info: source package ruby-rack-test
 dpkg-buildpackage: info: source version 2.2.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -948,7 +984,7 @@
 │ ruby-rack-test: Installing files and building extensions for ruby3.3         │
 └──────────────────────────────────────────────────────────────────────────────┘
 
-/usr/bin/ruby3.3 -S gem build --config-file /dev/null --verbose /tmp/d20250130-13284-2u6fk5/gemspec
+/usr/bin/ruby3.3 -S gem build --config-file /dev/null --verbose /tmp/d20250131-7284-c3glsh/gemspec
 WARNING:  open-ended dependency on rack (>= 1.3) is not recommended
   if rack is semantically versioned, use:
     add_runtime_dependency "rack", "~> 1.3"
@@ -964,7 +1000,7 @@
   Name: rack-test
   Version: 2.2.0
   File: rack-test-2.2.0.gem
-/usr/bin/ruby3.3 -S gem install --config-file /dev/null --verbose --local --verbose --no-document --ignore-dependencies --install-dir debian/ruby-rack-test/usr/share/rubygems-integration/all /tmp/d20250130-13284-2u6fk5/rack-test-2.2.0.gem
+/usr/bin/ruby3.3 -S gem install --config-file /dev/null --verbose --local --verbose --no-document --ignore-dependencies --install-dir debian/ruby-rack-test/usr/share/rubygems-integration/all /tmp/d20250131-7284-c3glsh/rack-test-2.2.0.gem
 /build/reproducible-path/ruby-rack-test-2.2.0/debian/ruby-rack-test/usr/share/rubygems-integration/all/gems/rack-test-2.2.0/lib/rack/test.rb
 /build/reproducible-path/ruby-rack-test-2.2.0/debian/ruby-rack-test/usr/share/rubygems-integration/all/gems/rack-test-2.2.0/lib/rack/test/cookie_jar.rb
 /build/reproducible-path/ruby-rack-test-2.2.0/debian/ruby-rack-test/usr/share/rubygems-integration/all/gems/rack-test-2.2.0/lib/rack/test/methods.rb
@@ -1000,13 +1036,13 @@
 
 RUBYLIB=. GEM_PATH=/build/reproducible-path/ruby-rack-test-2.2.0/debian/ruby-rack-test/usr/share/rubygems-integration/all:/build/reproducible-path/ruby-rack-test-2.2.0/debian/.debhelper/generated/_source/home/.local/share/gem/ruby/3.3.0:/var/lib/gems/3.3.0:/usr/local/lib/ruby/gems/3.3.0:/usr/lib/ruby/gems/3.3.0:/usr/lib/arm-linux-gnueabihf/ruby/gems/3.3.0:/usr/share/rubygems-integration/3.3.0:/usr/share/rubygems-integration/all:/usr/lib/arm-linux-gnueabihf/rubygems-integration/3.3.0 ruby3.3 -S rake --rakelibdir /gem2deb-nonexistent -f debian/ruby-tests.rake
 /usr/bin/ruby3.3 -w  spec/all.rb
-Run options: --seed 65490
+Run options: --seed 49166
 
 # Running:
 
 .................................................................................................................................................................................................................................................................................................
 
-Finished in 0.417032s, 692.9921 runs/s, 1668.9360 assertions/s.
+Finished in 0.902555s, 320.2020 runs/s, 771.1440 assertions/s.
 
 289 runs, 696 assertions, 0 failures, 0 errors, 0 skips
 /usr/bin/ruby3.1 /usr/bin/gem2deb-test-runner
@@ -1023,13 +1059,13 @@
 
 RUBYLIB=. GEM_PATH=/build/reproducible-path/ruby-rack-test-2.2.0/debian/ruby-rack-test/usr/share/rubygems-integration/all:/build/reproducible-path/ruby-rack-test-2.2.0/debian/.debhelper/generated/_source/home/.local/share/gem/ruby/3.1.0:/var/lib/gems/3.1.0:/usr/local/lib/ruby/gems/3.1.0:/usr/lib/ruby/gems/3.1.0:/usr/lib/arm-linux-gnueabihf/ruby/gems/3.1.0:/usr/share/rubygems-integration/3.1.0:/usr/share/rubygems-integration/all:/usr/lib/arm-linux-gnueabihf/rubygems-integration/3.1.0 ruby3.1 -S rake --rakelibdir /gem2deb-nonexistent -f debian/ruby-tests.rake
 /usr/bin/ruby3.1 -w  spec/all.rb
-Run options: --seed 35895
+Run options: --seed 24439
 
 # Running:
 
 .................................................................................................................................................................................................................................................................................................
 
-Finished in 0.457429s, 631.7922 runs/s, 1523.7340 assertions/s.
+Finished in 0.929380s, 310.9601 runs/s, 749.9625 assertions/s.
 
 289 runs, 697 assertions, 0 failures, 0 errors, 0 skips
 
@@ -1064,12 +1100,14 @@
 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/1921/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1921/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/7446 and its subdirectories
-I: Current time: Thu Jan 30 08:36:22 -12 2025
-I: pbuilder-time-stamp: 1738269382
+I: removing directory /srv/workspace/pbuilder/1921 and its subdirectories
+I: Current time: Fri Jan 31 10:40:11 +14 2025
+I: pbuilder-time-stamp: 1738269611