Diff of the two buildlogs:

--
--- b1/build.log	2024-12-18 10:15:40.272396964 +0000
+++ b2/build.log	2024-12-18 10:23:27.775221947 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Dec 17 22:13:56 -12 2024
-I: pbuilder-time-stamp: 1734516836
+I: Current time: Thu Dec 19 00:15:51 +14 2024
+I: pbuilder-time-stamp: 1734516951
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -31,52 +31,84 @@
 dpkg-source: info: applying 0004-Use-tested-ruby-version-to-run-script-in-tests.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2596/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/28644/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 Dec 18 10:16 /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/28644/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/28644/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='a94a82e199544156954293ce40782ff6'
-  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='2596'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=b77e0548f0684c189062d0880cacd171
+  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=28644
   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.zKvOMq3u/pbuilderrc_WA5o --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.zKvOMq3u/b1 --logfile b1/build.log ruby-slim_5.2.1-1.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.zKvOMq3u/pbuilderrc_ozwM --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.zKvOMq3u/b2 --logfile b2/build.log ruby-slim_5.2.1-1.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 6.1.0-28-armmp-lpae #1 SMP Debian 6.1.119-1 (2024-11-22) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-28-arm64 #1 SMP Debian 6.1.119-1 (2024-11-22) 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/2596/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/28644/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -277,7 +309,7 @@
 Get: 141 http://deb.debian.org/debian unstable/main armhf ruby-sass all 3.7.4-6 [224 kB]
 Get: 142 http://deb.debian.org/debian unstable/main armhf ruby-temple all 0.10.3-1 [31.1 kB]
 Get: 143 http://deb.debian.org/debian unstable/main armhf ruby-tilt all 2.4.0-2 [32.1 kB]
-Fetched 43.0 MB in 1s (72.6 MB/s)
+Fetched 43.0 MB in 2s (20.0 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libpython3.12-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 ... 19680 files and directories currently installed.)
@@ -758,8 +790,8 @@
 Setting up tzdata (2024b-4) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Wed Dec 18 10:14:45 UTC 2024.
-Universal Time is now:  Wed Dec 18 10:14:45 UTC 2024.
+Local time is now:      Wed Dec 18 10:18:30 UTC 2024.
+Universal Time is now:  Wed Dec 18 10:18:30 UTC 2024.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up ruby-temple (0.10.3-1) ...
@@ -885,7 +917,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/ruby-slim-5.2.1/ && 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  > ../ruby-slim_5.2.1-1_source.changes
+I: user script /srv/workspace/pbuilder/28644/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/28644/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/ruby-slim-5.2.1/ && 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  > ../ruby-slim_5.2.1-1_source.changes
 dpkg-buildpackage: info: source package ruby-slim
 dpkg-buildpackage: info: source version 5.2.1-1
 dpkg-buildpackage: info: source distribution unstable
@@ -918,7 +954,7 @@
 │ ruby-slim: Installing files and building extensions for ruby3.1              │
 └──────────────────────────────────────────────────────────────────────────────┘
 
-/usr/bin/ruby3.1 -S gem build --config-file /dev/null --verbose /tmp/d20241217-7458-x147fa/gemspec
+/usr/bin/ruby3.1 -S gem build --config-file /dev/null --verbose /tmp/d20241219-2162-jcuqvd/gemspec
 Failed to load /dev/null because it doesn't contain valid YAML hash
 WARNING:  open-ended dependency on tilt (>= 2.1.0) is not recommended
   if tilt is semantically versioned, use:
@@ -928,7 +964,7 @@
   Name: slim
   Version: 5.2.1
   File: slim-5.2.1.gem
-/usr/bin/ruby3.1 -S gem install --config-file /dev/null --verbose --local --verbose --no-document --ignore-dependencies --install-dir debian/ruby-slim/usr/share/rubygems-integration/all /tmp/d20241217-7458-x147fa/slim-5.2.1.gem
+/usr/bin/ruby3.1 -S gem install --config-file /dev/null --verbose --local --verbose --no-document --ignore-dependencies --install-dir debian/ruby-slim/usr/share/rubygems-integration/all /tmp/d20241219-2162-jcuqvd/slim-5.2.1.gem
 Failed to load /dev/null because it doesn't contain valid YAML hash
 /build/reproducible-path/ruby-slim-5.2.1/debian/ruby-slim/usr/share/rubygems-integration/all/gems/slim-5.2.1/bin/slimrb
 /build/reproducible-path/ruby-slim-5.2.1/debian/ruby-slim/usr/share/rubygems-integration/all/gems/slim-5.2.1/lib/slim.rb
@@ -996,31 +1032,31 @@
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:40: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:46: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:52: warning: possibly useless use of | in void context
-Run options: --seed 21488
+Run options: --seed 6717
 
 # Running:
 
-...................................../usr/share/rubygems-integration/all/gems/kramdown-2.5.1/lib/kramdown/parser/base.rb:60: warning: character class has duplicated range: /[\s\p{Z}]+/
-..................................................................................................................................(__TEMPLATE__):4: warning: possibly useless use of a variable in void context
-............................(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
-..............(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
-(__TEMPLATE__):3: warning: possibly useless use of a variable in void context
-..(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
-...............(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
-..(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
+...../usr/share/rubygems-integration/all/gems/kramdown-2.5.1/lib/kramdown/parser/base.rb:60: warning: character class has duplicated range: /[\s\p{Z}]+/
+...(__TEMPLATE__):3: warning: assigned but unused variable - test
+.....(__TEMPLATE__):3: warning: assigned but unused variable - a
+.(__TEMPLATE__):8: warning: assigned but unused variable - b
+(__TEMPLATE__):12: warning: assigned but unused variable - c
+.............................................................................................................................(__TEMPLATE__):4: warning: possibly useless use of a variable in void context
+...........(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
+.....(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
+.........(__TEMPLATE__):1: warning: possibly useless use of a variable in void context
+..................................(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
+............(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
+...(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
 (__TEMPLATE__):4: warning: possibly useless use of a variable in void context
 (__TEMPLATE__):5: warning: possibly useless use of a variable in void context
-..(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
-.............(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
 .(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
-........(__TEMPLATE__):1: warning: possibly useless use of a variable in void context
-..........................(__TEMPLATE__):3: warning: assigned but unused variable - a
-...(__TEMPLATE__):8: warning: assigned but unused variable - b
-(__TEMPLATE__):12: warning: assigned but unused variable - c
-.(__TEMPLATE__):3: warning: assigned but unused variable - test
-.......................
+....(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
+(__TEMPLATE__):3: warning: possibly useless use of a variable in void context
+..............(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
+.........................................................................
 
-Finished in 16.875687s, 18.0733 runs/s, 31.5246 assertions/s.
+Finished in 112.884113s, 2.7019 runs/s, 4.7128 assertions/s.
 
 305 runs, 532 assertions, 0 failures, 0 errors, 0 skips
 /build/reproducible-path/ruby-slim-5.2.1/lib/slim/grammar.rb:8: warning: possibly useless use of | in void context
@@ -1029,15 +1065,15 @@
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:40: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:46: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:52: warning: possibly useless use of | in void context
-Run options: --seed 49871
+Run options: --seed 6564
 
 # Running:
 
-............................(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
+........................(__TEMPLATE__):2: warning: possibly useless use of a variable in void context
 (__TEMPLATE__):3: warning: possibly useless use of a variable in void context
-..........................................
+..............................................
 
-Finished in 0.567063s, 123.4432 runs/s, 123.4432 assertions/s.
+Finished in 4.811965s, 14.5471 runs/s, 14.5471 assertions/s.
 
 70 runs, 70 assertions, 0 failures, 0 errors, 0 skips
 /build/reproducible-path/ruby-slim-5.2.1/lib/slim/grammar.rb:8: warning: possibly useless use of | in void context
@@ -1046,14 +1082,14 @@
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:40: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:46: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:52: warning: possibly useless use of | in void context
-Run options: --seed 28696
+Run options: --seed 34687
 
 # Running:
 
-.............(__TEMPLATE__):6: warning: possibly useless use of a variable in void context
-........
+...........(__TEMPLATE__):6: warning: possibly useless use of a variable in void context
+..........
 
-Finished in 0.202673s, 103.6153 runs/s, 103.6153 assertions/s.
+Finished in 0.794128s, 26.4441 runs/s, 26.4441 assertions/s.
 
 21 runs, 21 assertions, 0 failures, 0 errors, 0 skips
 /build/reproducible-path/ruby-slim-5.2.1/lib/slim/grammar.rb:8: warning: possibly useless use of | in void context
@@ -1062,14 +1098,14 @@
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:40: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:46: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:52: warning: possibly useless use of | in void context
-Run options: --seed 48356
+Run options: --seed 14305
 
 # Running:
 
-../usr/share/rubygems-integration/all/gems/kramdown-2.5.1/lib/kramdown/parser/base.rb:60: warning: character class has duplicated range: /[\s\p{Z}]+/
-..
+./usr/share/rubygems-integration/all/gems/kramdown-2.5.1/lib/kramdown/parser/base.rb:60: warning: character class has duplicated range: /[\s\p{Z}]+/
+...
 
-Finished in 0.316530s, 12.6370 runs/s, 28.4334 assertions/s.
+Finished in 1.223004s, 3.2706 runs/s, 7.3589 assertions/s.
 
 4 runs, 9 assertions, 0 failures, 0 errors, 0 skips
 /build/reproducible-path/ruby-slim-5.2.1/lib/slim/grammar.rb:8: warning: possibly useless use of | in void context
@@ -1078,13 +1114,13 @@
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:40: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:46: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:52: warning: possibly useless use of | in void context
-Run options: --seed 33295
+Run options: --seed 65368
 
 # Running:
 
 ...........
 
-Finished in 0.162470s, 67.7049 runs/s, 67.7049 assertions/s.
+Finished in 1.095070s, 10.0450 runs/s, 10.0450 assertions/s.
 
 11 runs, 11 assertions, 0 failures, 0 errors, 0 skips
 /build/reproducible-path/ruby-slim-5.2.1/lib/slim/grammar.rb:8: warning: possibly useless use of | in void context
@@ -1093,13 +1129,13 @@
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:40: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:46: warning: possibly useless use of | in void context
 /usr/share/rubygems-integration/all/gems/temple-0.10.3/lib/temple/grammar.rb:52: warning: possibly useless use of | in void context
-Run options: --seed 62825
+Run options: --seed 29496
 
 # Running:
 
 ..
 
-Finished in 0.075391s, 26.5282 runs/s, 26.5282 assertions/s.
+Finished in 0.482182s, 4.1478 runs/s, 4.1478 assertions/s.
 
 2 runs, 2 assertions, 0 failures, 0 errors, 0 skips
 
@@ -1141,12 +1177,14 @@
 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/28644/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/28644/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/2596 and its subdirectories
-I: Current time: Tue Dec 17 22:15:36 -12 2024
-I: pbuilder-time-stamp: 1734516936
+I: removing directory /srv/workspace/pbuilder/28644 and its subdirectories
+I: Current time: Thu Dec 19 00:23:22 +14 2024
+I: pbuilder-time-stamp: 1734517402