Diff of the two buildlogs:

--
--- b1/build.log	2024-12-03 13:14:40.305586807 +0000
+++ b2/build.log	2024-12-03 13:17:42.945359117 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Jan  5 07:35:53 -12 2026
-I: pbuilder-time-stamp: 1767641753
+I: Current time: Wed Dec  4 03:14:44 +14 2024
+I: pbuilder-time-stamp: 1733231684
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -27,53 +27,85 @@
 dpkg-source: info: unpacking haskell-prelude-extras_0.4.0.3-9.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/9362/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/27343/tmp/hooks/D01_modify_environment starting
+debug: Running on infom07-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 Dec  3 13:14 /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/27343/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/27343/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=6 '
-  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]="32" [3]="1" [4]="release" [5]="i686-pc-linux-gnu")
+  BASH_VERSION='5.2.32(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=5 '
+  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='23234df74d304ddb9d5ae489788db173'
-  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='9362'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=83653d2c6d434020b707ff16a944fdc6
+  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=27343
   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.4bO4AuQ6/pbuilderrc_D3ir --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.4bO4AuQ6/b1 --logfile b1/build.log haskell-prelude-extras_0.4.0.3-9.dsc'
-  SUDO_GID='111'
-  SUDO_UID='104'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
+  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.4bO4AuQ6/pbuilderrc_Nzsw --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.4bO4AuQ6/b2 --logfile b2/build.log haskell-prelude-extras_0.4.0.3-9.dsc'
+  SUDO_GID=111
+  SUDO_UID=104
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
 I: uname -a
-  Linux infom08-i386 6.11.5+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.11.5-1~bpo12+1 (2024-11-11) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-28-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.119-1 (2024-11-22) 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/9362/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/27343/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -224,7 +256,7 @@
 Get: 103 http://deb.debian.org/debian unstable/main i386 haskell-devscripts-minimal all 0.16.33 [53.0 kB]
 Get: 104 http://deb.debian.org/debian unstable/main i386 hscolour i386 1.25-1 [1973 kB]
 Get: 105 http://deb.debian.org/debian unstable/main i386 haskell-devscripts all 0.16.33 [6156 B]
-Fetched 273 MB in 2s (111 MB/s)
+Fetched 273 MB in 10s (27.6 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libgmpxx4ldbl:i386.
 (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 ... 19955 files and directories currently installed.)
@@ -584,8 +616,8 @@
 Setting up tzdata (2024b-3) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Mon Jan  5 19:36:30 UTC 2026.
-Universal Time is now:  Mon Jan  5 19:36:30 UTC 2026.
+Local time is now:      Tue Dec  3 13:16:05 UTC 2024.
+Universal Time is now:  Tue Dec  3 13:16:05 UTC 2024.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -676,7 +708,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/haskell-prelude-extras-0.4.0.3/ && 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-prelude-extras_0.4.0.3-9_source.changes
+I: user script /srv/workspace/pbuilder/27343/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/27343/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/haskell-prelude-extras-0.4.0.3/ && 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-prelude-extras_0.4.0.3-9_source.changes
 dpkg-buildpackage: info: source package haskell-prelude-extras
 dpkg-buildpackage: info: source version 0.4.0.3-9
 dpkg-buildpackage: info: source distribution unstable
@@ -717,7 +753,7 @@
 [2 of 2] Linking debian/hlibrary.setup
 perl -d:Confess -MDebian::Debhelper::Buildsystem::Haskell::Recipes=/.*/ \
 	-E 'configure_recipe'
-Running find . ! -newer /tmp/fHXBwqLkBa -exec touch -d 1998-01-01 UTC {} ;
+Running find . ! -newer /tmp/TIjCKJ54SS -exec touch -d 1998-01-01 UTC {} ;
 Running dh_listpackages
 libghc-prelude-extras-dev
 libghc-prelude-extras-prof
@@ -822,7 +858,7 @@
 creating dist-ghc/doc
 creating dist-ghc/doc/html
 creating dist-ghc/doc/html/prelude-extras
-Running: /usr/bin/haddock '@dist-ghc/doc/html/prelude-extras/haddock-response16863-1.txt' '--mathjax=file:///usr/share/javascript/mathjax/MathJax.js'
+Running: /usr/bin/haddock '@dist-ghc/doc/html/prelude-extras/haddock-response9370-1.txt' '--mathjax=file:///usr/share/javascript/mathjax/MathJax.js'
    4% (  2 / 43) in 'Prelude.Extras'
   Missing documentation for:
     Module header
@@ -1177,10 +1213,10 @@
 dh_installdeb -plibghc-prelude-extras-dev 
 dh_perl -plibghc-prelude-extras-dev 
 dh_shlibdeps -plibghc-prelude-extras-dev -- --ignore-missing-info
-dpkg-shlibdeps: warning: debian/libghc-prelude-extras-dev/usr/lib/haskell-packages/ghc/lib/i386-linux-ghc-9.6.6/libHSprelude-extras-0.4.0.3-C2idnHcjDDsHRiYt6Bz9Gr-ghc9.6.6.so contains an unresolvable reference to symbol stg_ap_pp_fast: it's probably a plugin
+dpkg-shlibdeps: warning: debian/libghc-prelude-extras-dev/usr/lib/haskell-packages/ghc/lib/i386-linux-ghc-9.6.6/libHSprelude-extras-0.4.0.3-C2idnHcjDDsHRiYt6Bz9Gr-ghc9.6.6.so contains an unresolvable reference to symbol stg_ap_pppp_info: it's probably a plugin
 dpkg-shlibdeps: warning: 19 other similar warnings have been skipped (use -v to see them all)
-dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-prelude-extras-dev/usr/lib/haskell-packages/ghc/lib/i386-linux-ghc-9.6.6/libHSprelude-extras-0.4.0.3-C2idnHcjDDsHRiYt6Bz9Gr-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-prelude-extras-dev/usr/lib/haskell-packages/ghc/lib/i386-linux-ghc-9.6.6/libHSprelude-extras-0.4.0.3-C2idnHcjDDsHRiYt6Bz9Gr-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-prelude-extras-dev/usr/lib/haskell-packages/ghc/lib/i386-linux-ghc-9.6.6/libHSprelude-extras-0.4.0.3-C2idnHcjDDsHRiYt6Bz9Gr-ghc9.6.6.so was not linked against libm.so.6 (it uses none of the library's symbols)
 dh_installdeb -plibghc-prelude-extras-prof 
 dh_perl -plibghc-prelude-extras-prof 
 dh_shlibdeps -plibghc-prelude-extras-prof -- --ignore-missing-info
@@ -1216,12 +1252,14 @@
 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/27343/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/27343/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/9362 and its subdirectories
-I: Current time: Mon Jan  5 07:37:38 -12 2026
-I: pbuilder-time-stamp: 1767641858
+I: removing directory /srv/workspace/pbuilder/27343 and its subdirectories
+I: Current time: Wed Dec  4 03:17:41 +14 2024
+I: pbuilder-time-stamp: 1733231861