Diff of the two buildlogs:

--
--- b1/build.log	2024-12-30 14:00:13.323873846 +0000
+++ b2/build.log	2024-12-30 14:01:56.679148579 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Dec 30 01:58:41 -12 2024
-I: pbuilder-time-stamp: 1735567121
+I: Current time: Tue Dec 31 04:00:16 +14 2024
+I: pbuilder-time-stamp: 1735567216
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -26,52 +26,84 @@
 dpkg-source: info: unpacking haskell-stream_0.4.7.2-10.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3824384/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/224951/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 Dec 30 14:00 /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/224951/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/224951/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='trixie'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='f0c51f7ff7c1431893f84de466b928eb'
-  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='3824384'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=8bca29c26389489794a8021d243382ff
+  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=224951
   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.ae07toEn/pbuilderrc_YGlJ --distribution trixie --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.ae07toEn/b1 --logfile b1/build.log haskell-stream_0.4.7.2-10.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.ae07toEn/pbuilderrc_8CXq --distribution trixie --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.ae07toEn/b2 --logfile b2/build.log haskell-stream_0.4.7.2-10.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 codethink02-arm64 6.1.0-28-cloud-arm64 #1 SMP Debian 6.1.119-1 (2024-11-22) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-28-cloud-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/3824384/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/224951/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -243,7 +275,7 @@
 Get: 112 http://deb.debian.org/debian trixie/main arm64 libghc-splitmix-prof arm64 0.1.0.5-2 [51.1 kB]
 Get: 113 http://deb.debian.org/debian trixie/main arm64 libghc-random-prof arm64 1.2.1.2-1 [351 kB]
 Get: 114 http://deb.debian.org/debian trixie/main arm64 libghc-quickcheck2-prof arm64 2.14.3-2 [797 kB]
-Fetched 221 MB in 1s (212 MB/s)
+Fetched 221 MB in 1s (223 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libgmpxx4ldbl: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 ... 20081 files and directories currently installed.)
@@ -630,8 +662,8 @@
 Setting up tzdata (2024b-4) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Mon Dec 30 13:59:12 UTC 2024.
-Universal Time is now:  Mon Dec 30 13:59:12 UTC 2024.
+Local time is now:      Mon Dec 30 14:00:49 UTC 2024.
+Universal Time is now:  Mon Dec 30 14:00:49 UTC 2024.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -731,7 +763,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/haskell-stream-0.4.7.2/ && 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  > ../haskell-stream_0.4.7.2-10_source.changes
+I: user script /srv/workspace/pbuilder/224951/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/224951/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/haskell-stream-0.4.7.2/ && 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  > ../haskell-stream_0.4.7.2-10_source.changes
 dpkg-buildpackage: info: source package haskell-stream
 dpkg-buildpackage: info: source version 0.4.7.2-10
 dpkg-buildpackage: info: source distribution unstable
@@ -772,7 +808,7 @@
 [2 of 2] Linking debian/hlibrary.setup
 perl -d:Confess -MDebian::Debhelper::Buildsystem::Haskell::Recipes=/.*/ \
 	-E 'configure_recipe'
-Running find . ! -newer /tmp/Sf6vEiEYnC -exec touch -d 1998-01-01 UTC {} ;
+Running find . ! -newer /tmp/edWs9q_yp5 -exec touch -d 1998-01-01 UTC {} ;
 Running dh_listpackages
 libghc-stream-dev
 libghc-stream-prof
@@ -905,7 +941,7 @@
 creating dist-ghc/doc
 creating dist-ghc/doc/html
 creating dist-ghc/doc/html/Stream
-Running: /usr/bin/haddock '@dist-ghc/doc/html/Stream/haddock-response3833420-1.txt' '--mathjax=file:///usr/share/javascript/mathjax/MathJax.js'
+Running: /usr/bin/haddock '@dist-ghc/doc/html/Stream/haddock-response232121-1.txt' '--mathjax=file:///usr/share/javascript/mathjax/MathJax.js'
 Warning: 'isPrefix' is out of scope.
     If you qualify the identifier, haddock can try to link it anyway.
 Warning: 'Streams' is out of scope.
@@ -1246,21 +1282,21 @@
 dh_installdeb -plibghc-stream-dev 
 dh_perl -plibghc-stream-dev 
 dh_shlibdeps -plibghc-stream-dev -- --ignore-missing-info
-dpkg-shlibdeps: warning: debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so contains an unresolvable reference to symbol stg_ap_ppp_fast: it's probably a plugin
+dpkg-shlibdeps: warning: debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so contains an unresolvable reference to symbol stg_sel_1_upd_info: it's probably a plugin
 dpkg-shlibdeps: warning: 22 other similar warnings have been skipped (use -v to see them all)
-dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSpretty-1.1.3.6-ghc9.6.6.so (it uses none of the library's symbols)
-dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHStemplate-haskell-2.20.0.0-ghc9.6.6.so (it uses none of the library's symbols)
-dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libgmp.so.10 (it uses none of the library's symbols)
+dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSbytestring-0.11.5.3-ghc9.6.6.so (it uses none of the library's symbols)
 dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSghc-bignum-1.3-ghc9.6.6.so (it uses none of the library's symbols)
-dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libm.so.6 (it uses none of the library's symbols)
+dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSarray-0.5.6.0-ghc9.6.6.so (it uses none of the library's symbols)
 dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSmtl-2.3.1-ghc9.6.6.so (it uses none of the library's symbols)
+dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSrandom-1.2.1.2-9nSipNyPzIK3OtGny4BWjI-ghc9.6.6.so (it uses none of the library's symbols)
+dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libgmp.so.10 (it uses none of the library's symbols)
 dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHScontainers-0.6.7-ghc9.6.6.so (it uses none of the library's symbols)
-dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHStransformers-0.6.1.0-ghc9.6.6.so (it uses none of the library's symbols)
+dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libm.so.6 (it uses none of the library's symbols)
 dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSghc-boot-th-9.6.6-ghc9.6.6.so (it uses none of the library's symbols)
+dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHStransformers-0.6.1.0-ghc9.6.6.so (it uses none of the library's symbols)
 dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSdeepseq-1.4.8.1-ghc9.6.6.so (it uses none of the library's symbols)
-dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSarray-0.5.6.0-ghc9.6.6.so (it uses none of the library's symbols)
-dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSrandom-1.2.1.2-9nSipNyPzIK3OtGny4BWjI-ghc9.6.6.so (it uses none of the library's symbols)
-dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSbytestring-0.11.5.3-ghc9.6.6.so (it uses none of the library's symbols)
+dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHSpretty-1.1.3.6-ghc9.6.6.so (it uses none of the library's symbols)
+dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-stream-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.6.6/libHSStream-0.4.7.2-8p6yYeZGf0J1ndypUmjSyS-ghc9.6.6.so was not linked against libHStemplate-haskell-2.20.0.0-ghc9.6.6.so (it uses none of the library's symbols)
 dh_installdeb -plibghc-stream-prof 
 dh_perl -plibghc-stream-prof 
 dh_shlibdeps -plibghc-stream-prof -- --ignore-missing-info
@@ -1290,12 +1326,14 @@
 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/224951/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/224951/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/3824384 and its subdirectories
-I: Current time: Mon Dec 30 02:00:12 -12 2024
-I: pbuilder-time-stamp: 1735567212
+I: removing directory /srv/workspace/pbuilder/224951 and its subdirectories
+I: Current time: Tue Dec 31 04:01:55 +14 2024
+I: pbuilder-time-stamp: 1735567315