Diff of the two buildlogs:

--
--- b1/build.log	2025-03-04 09:45:36.372133917 +0000
+++ b2/build.log	2025-03-04 09:46:23.482017118 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Apr  6 04:07:50 -12 2026
-I: pbuilder-time-stamp: 1775491670
+I: Current time: Tue Mar  4 23:45:39 +14 2025
+I: pbuilder-time-stamp: 1741081539
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -26,52 +26,84 @@
 dpkg-source: info: applying 0004-Fix-ftbfs-gcc-14-Closes-1075472.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3607339/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3295456/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink04-arm64.
+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 Mar  4 09:45 /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/3295456/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3295456/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='arm64'
-  DEBIAN_FRONTEND='noninteractive'
+  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]="aarch64-unknown-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=arm64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=12 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='fa368a603ed44f36af6f1cac33121272'
-  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='3607339'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=631d5708e4fd442192bd695199a2f1f3
+  LANG=C
+  LANGUAGE=nl_BE:nl
+  LC_ALL=C
+  MACHTYPE=aarch64-unknown-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=3295456
   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.fWTIMjdU/pbuilderrc_myRz --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.fWTIMjdU/b1 --logfile b1/build.log ruby-posix-spawn_0.3.15-3.dsc'
-  SUDO_GID='109'
-  SUDO_UID='104'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.4:3128'
+  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.fWTIMjdU/pbuilderrc_GRWI --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.fWTIMjdU/b2 --logfile b2/build.log ruby-posix-spawn_0.3.15-3.dsc'
+  SUDO_GID=109
+  SUDO_UID=104
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://192.168.101.4:3128
 I: uname -a
-  Linux codethink03-arm64 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3607339/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3295456/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -242,7 +274,7 @@
 Get: 129 http://deb.debian.org/debian unstable/main arm64 ruby3.3-dev arm64 3.3.7-1 [1038 kB]
 Get: 130 http://deb.debian.org/debian unstable/main arm64 ruby-all-dev arm64 1:3.3+b1 [6496 B]
 Get: 131 http://deb.debian.org/debian unstable/main arm64 gem2deb arm64 2.2.5 [48.0 kB]
-Fetched 46.9 MB in 0s (102 MB/s)
+Fetched 46.9 MB in 0s (140 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.13-minimal:arm64.
 (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 ... 19897 files and directories currently installed.)
@@ -680,8 +712,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Mon Apr  6 16:08:15 UTC 2026.
-Universal Time is now:  Mon Apr  6 16:08:15 UTC 2026.
+Local time is now:      Tue Mar  4 09:46:02 UTC 2025.
+Universal Time is now:  Tue Mar  4 09:46:02 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up ruby-minitest (5.25.4-2) ...
@@ -801,7 +833,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/ruby-posix-spawn-0.3.15/ && 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-posix-spawn_0.3.15-3_source.changes
+I: user script /srv/workspace/pbuilder/3295456/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/3295456/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/ruby-posix-spawn-0.3.15/ && 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-posix-spawn_0.3.15-3_source.changes
 dpkg-buildpackage: info: source package ruby-posix-spawn
 dpkg-buildpackage: info: source version 0.3.15-3
 dpkg-buildpackage: info: source distribution unstable
@@ -857,13 +893,13 @@
 ["/usr/bin/ruby3.3", "-I/usr/lib/ruby/vendor_ruby", "extconf.rb"]
 creating Makefile
 current directory: /build/reproducible-path/ruby-posix-spawn-0.3.15/ext
-["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "DESTDIR=", "sitearchdir=./.gem.20260406-3622884-jaq266", "sitelibdir=./.gem.20260406-3622884-jaq266", "clean"]
+["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "DESTDIR=", "sitearchdir=./.gem.20250304-3315707-ogl8ax", "sitelibdir=./.gem.20250304-3315707-ogl8ax", "clean"]
 make[2]: Entering directory '/build/reproducible-path/ruby-posix-spawn-0.3.15/ext'
 rm -f 
 rm -fr posix_spawn_ext.so false posix-spawn.o *.bak mkmf.log .*.time
 make[2]: Leaving directory '/build/reproducible-path/ruby-posix-spawn-0.3.15/ext'
 current directory: /build/reproducible-path/ruby-posix-spawn-0.3.15/ext
-["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "DESTDIR=", "sitearchdir=./.gem.20260406-3622884-jaq266", "sitelibdir=./.gem.20260406-3622884-jaq266"]
+["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "DESTDIR=", "sitearchdir=./.gem.20250304-3315707-ogl8ax", "sitelibdir=./.gem.20250304-3315707-ogl8ax"]
 make[2]: Entering directory '/build/reproducible-path/ruby-posix-spawn-0.3.15/ext'
 gcc -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=. -I. -I/usr/include/aarch64-linux-gnu/ruby-3.3.0 -I/usr/include/ruby-3.3.0/ruby/backward -I/usr/include/ruby-3.3.0 -I. -Wdate-time -D_FORTIFY_SOURCE=2   -fPIC -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -fPIC -Wall   -o posix-spawn.o -c posix-spawn.c
 posix-spawn.c: In function 'each_env_i':
@@ -883,14 +919,14 @@
 gcc -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=. -shared -o posix_spawn_ext.so posix-spawn.o -L. -L/usr/lib/aarch64-linux-gnu -L. -Wl,-z,relro -Wl,-z,now -fstack-protector-strong -rdynamic -Wl,-export-dynamic -Wl,--no-as-needed -Wl,-z,relro -Wl,-z,now    -lruby-3.3  -lm -lpthread  -lc
 make[2]: Leaving directory '/build/reproducible-path/ruby-posix-spawn-0.3.15/ext'
 current directory: /build/reproducible-path/ruby-posix-spawn-0.3.15/ext
-["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "DESTDIR=", "sitearchdir=./.gem.20260406-3622884-jaq266", "sitelibdir=./.gem.20260406-3622884-jaq266", "install"]
+["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "DESTDIR=", "sitearchdir=./.gem.20250304-3315707-ogl8ax", "sitelibdir=./.gem.20250304-3315707-ogl8ax", "install"]
 make[2]: Entering directory '/build/reproducible-path/ruby-posix-spawn-0.3.15/ext'
-/bin/mkdir -p . ./.gem.20260406-3622884-jaq266
+/bin/mkdir -p . ./.gem.20250304-3315707-ogl8ax
 exit > .sitearchdir.time
-/usr/bin/install -c -m 0755 posix_spawn_ext.so ./.gem.20260406-3622884-jaq266
+/usr/bin/install -c -m 0755 posix_spawn_ext.so ./.gem.20250304-3315707-ogl8ax
 make[2]: Leaving directory '/build/reproducible-path/ruby-posix-spawn-0.3.15/ext'
 current directory: /build/reproducible-path/ruby-posix-spawn-0.3.15/ext
-["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "DESTDIR=", "sitearchdir=./.gem.20260406-3622884-jaq266", "sitelibdir=./.gem.20260406-3622884-jaq266", "clean"]
+["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-posix-spawn-0.3.15=.", "DESTDIR=", "sitearchdir=./.gem.20250304-3315707-ogl8ax", "sitelibdir=./.gem.20250304-3315707-ogl8ax", "clean"]
 make[2]: Entering directory '/build/reproducible-path/ruby-posix-spawn-0.3.15/ext'
 rm -f 
 rm -fr posix_spawn_ext.so false posix-spawn.o *.bak mkmf.log .*.time
@@ -898,13 +934,13 @@
 current directory: /build/reproducible-path/ruby-posix-spawn-0.3.15/ext
 /usr/bin/ruby3.3 -I/usr/lib/ruby/vendor_ruby extconf.rb
 current directory: /build/reproducible-path/ruby-posix-spawn-0.3.15/ext
-make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. DESTDIR\= sitearchdir\=./.gem.20260406-3622884-jaq266 sitelibdir\=./.gem.20260406-3622884-jaq266 clean
+make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. DESTDIR\= sitearchdir\=./.gem.20250304-3315707-ogl8ax sitelibdir\=./.gem.20250304-3315707-ogl8ax clean
 current directory: /build/reproducible-path/ruby-posix-spawn-0.3.15/ext
-make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. DESTDIR\= sitearchdir\=./.gem.20260406-3622884-jaq266 sitelibdir\=./.gem.20260406-3622884-jaq266
+make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. DESTDIR\= sitearchdir\=./.gem.20250304-3315707-ogl8ax sitelibdir\=./.gem.20250304-3315707-ogl8ax
 current directory: /build/reproducible-path/ruby-posix-spawn-0.3.15/ext
-make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. DESTDIR\= sitearchdir\=./.gem.20260406-3622884-jaq266 sitelibdir\=./.gem.20260406-3622884-jaq266 install
+make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. DESTDIR\= sitearchdir\=./.gem.20250304-3315707-ogl8ax sitelibdir\=./.gem.20250304-3315707-ogl8ax install
 current directory: /build/reproducible-path/ruby-posix-spawn-0.3.15/ext
-make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. DESTDIR\= sitearchdir\=./.gem.20260406-3622884-jaq266 sitelibdir\=./.gem.20260406-3622884-jaq266 clean
+make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-posix-spawn-0.3.15\=. DESTDIR\= sitearchdir\=./.gem.20250304-3315707-ogl8ax sitelibdir\=./.gem.20250304-3315707-ogl8ax clean
 Rewriting shebang line of /build/reproducible-path/ruby-posix-spawn-0.3.15/debian/ruby-posix-spawn/usr/bin/posix-spawn-benchmark
 
 ┌──────────────────────────────────────────────────────────────────────────────┐
@@ -960,12 +996,14 @@
 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/3295456/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3295456/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/3607339 and its subdirectories
-I: Current time: Mon Apr  6 04:08:34 -12 2026
-I: pbuilder-time-stamp: 1775491714
+I: removing directory /srv/workspace/pbuilder/3295456 and its subdirectories
+I: Current time: Tue Mar  4 23:46:22 +14 2025
+I: pbuilder-time-stamp: 1741081582