Diff of the two buildlogs:

--
--- b1/build.log	2023-04-19 10:56:50.684670772 +0000
+++ b2/build.log	2023-04-19 11:08:34.897438388 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue May 21 05:08:51 -12 2024
-I: pbuilder-time-stamp: 1716311331
+I: Current time: Thu Apr 20 00:56:54 +14 2023
+I: pbuilder-time-stamp: 1681901814
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bookworm-reproducible-base.tgz]
 I: copying local configuration
@@ -16,7 +16,7 @@
 I: copying [./haskell-fgl_5.7.0.3.orig.tar.gz]
 I: copying [./haskell-fgl_5.7.0.3-2.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Mon Jul 18 21:10:59 2022 -12
+gpgv: Signature made Tue Jul 19 23:10:59 2022 +14
 gpgv:                using RSA key 27D73CA5F5B5D7E01A5136F5D7A86780CC64403C
 gpgv:                issuer "iliastsi@debian.org"
 gpgv: Can't check signature: No public key
@@ -28,52 +28,84 @@
 dpkg-source: info: applying newer-hspec
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/4022/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/4173/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink14-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 Apr 20 00:57 /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/4173/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/4173/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build'
-  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]="15" [3]="1" [4]="release" [5]="aarch64-unknown-linux-gnu")
+  BASH_VERSION='5.2.15(1)-release'
+  BUILDDIR=/build
+  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=8'
-  DISTRIBUTION='bookworm'
-  HOME='/var/lib/jenkins'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=bookworm
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/var/lib/jenkins
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  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='4022'
-  PS1='# '
-  PS2='> '
+  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=4173
   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.TsS197F1/pbuilderrc_l1Yv --distribution bookworm --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.TsS197F1/b1 --logfile b1/build.log haskell-fgl_5.7.0.3-2.dsc'
-  SUDO_GID='117'
-  SUDO_UID='110'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  USERNAME='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.16:3128'
+  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.TsS197F1/pbuilderrc_gueA --distribution bookworm --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.TsS197F1/b2 --logfile b2/build.log --extrapackages usrmerge haskell-fgl_5.7.0.3-2.dsc'
+  SUDO_GID=117
+  SUDO_UID=110
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  USERNAME=root
+  _='I: set'
+  http_proxy=http://192.168.101.16:3128
 I: uname -a
-  Linux codethink11-arm64 4.15.0-209-generic #220-Ubuntu SMP Tue Mar 21 19:52:44 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-209-generic #220-Ubuntu SMP Tue Mar 21 19:52:44 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 21 04:47 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/4022/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr 20 00:25 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/4173/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -263,7 +295,7 @@
 Get: 130 http://deb.debian.org/debian bookworm/main arm64 libghc-hspec-core-prof arm64 2.8.5-1+b2 [739 kB]
 Get: 131 http://deb.debian.org/debian bookworm/main arm64 libghc-hspec-dev arm64 2.8.5-2+b2 [40.2 kB]
 Get: 132 http://deb.debian.org/debian bookworm/main arm64 libghc-hspec-prof arm64 2.8.5-2+b2 [37.8 kB]
-Fetched 307 MB in 8s (37.4 MB/s)
+Fetched 307 MB in 6s (55.4 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libbsd0: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 ... 19616 files and directories currently installed.)
@@ -809,8 +841,17 @@
 Writing extended state information...
 Building tag database...
  -> Finished parsing the build-deps
+Reading package lists...
+Building dependency tree...
+Reading state information...
+usrmerge is already the newest version (35).
+0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/haskell-fgl-5.7.0.3/ && 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-fgl_5.7.0.3-2_source.changes
+I: user script /srv/workspace/pbuilder/4173/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/4173/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/haskell-fgl-5.7.0.3/ && 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-fgl_5.7.0.3-2_source.changes
 dpkg-buildpackage: info: source package haskell-fgl
 dpkg-buildpackage: info: source version 5.7.0.3-2
 dpkg-buildpackage: info: source distribution unstable
@@ -851,7 +892,7 @@
 Linking debian/hlibrary.setup ...
 perl -d:Confess -MDebian::Debhelper::Buildsystem::Haskell::Recipes=/.*/ \
 	-E 'configure_recipe'
-Running find . ! -newer /tmp/ib2ncgj3NX -exec touch -d 1998-01-01 UTC {} ;
+Running find . ! -newer /tmp/NJHO62CBj3 -exec touch -d 1998-01-01 UTC {} ;
 Running dh_listpackages
 libghc-fgl-dev
 libghc-fgl-prof
@@ -1103,7 +1144,7 @@
     node count
       +++ OK, passed 100 tests.
     nodeRange
-      +++ OK, passed 100 tests; 19 discarded.
+      +++ OK, passed 100 tests; 15 discarded.
     mkGraph (nodes)
       +++ OK, passed 100 tests.
     mkGraph (edges)
@@ -1111,9 +1152,9 @@
     mkGraph (order)
       +++ OK, passed 100 tests.
     match
-      +++ OK, passed 100 tests; 19 discarded.
+      +++ OK, passed 100 tests; 15 discarded.
     matchAny
-      +++ OK, passed 100 tests; 19 discarded.
+      +++ OK, passed 100 tests; 15 discarded.
     newNodes
       +++ OK, passed 100 tests.
     ufold (nodes)
@@ -1130,7 +1171,7 @@
       +++ OK, passed 100 tests.
   Dynamic tests
     merging (&)
-      +++ OK, passed 100 tests; 19 discarded.
+      +++ OK, passed 100 tests; 15 discarded.
     gmap (id)
       +++ OK, passed 100 tests.
     insNode
@@ -1138,11 +1179,11 @@
     insNodes
       +++ OK, passed 100 tests.
     insEdge
-      +++ OK, passed 100 tests; 15 discarded.
+      +++ OK, passed 100 tests; 13 discarded.
     insEdges
-      +++ OK, passed 100 tests; 15 discarded.
+      +++ OK, passed 100 tests; 13 discarded.
     insEdges (mult)
-      +++ OK, passed 100 tests; 17 discarded.
+      +++ OK, passed 100 tests; 16 discarded.
     delNode
       +++ OK, passed 100 tests.
     delNodes
@@ -1152,7 +1193,7 @@
     delEdges
       +++ OK, passed 100 tests.
     delLEdge
-      +++ OK, passed 100 tests; 15 discarded.
+      +++ OK, passed 100 tests; 13 discarded.
     delAllLEdge
       +++ OK, passed 100 tests.
     valid_mkGraph
@@ -1176,7 +1217,7 @@
     node count
       +++ OK, passed 100 tests.
     nodeRange
-      +++ OK, passed 100 tests; 19 discarded.
+      +++ OK, passed 100 tests; 15 discarded.
     mkGraph (nodes)
       +++ OK, passed 100 tests.
     mkGraph (edges)
@@ -1184,9 +1225,9 @@
     mkGraph (order)
       +++ OK, passed 100 tests.
     match
-      +++ OK, passed 100 tests; 19 discarded.
+      +++ OK, passed 100 tests; 15 discarded.
     matchAny
-      +++ OK, passed 100 tests; 19 discarded.
+      +++ OK, passed 100 tests; 15 discarded.
     newNodes
       +++ OK, passed 100 tests.
     ufold (nodes)
@@ -1203,7 +1244,7 @@
       +++ OK, passed 100 tests.
   Dynamic tests
     merging (&)
-      +++ OK, passed 100 tests; 19 discarded.
+      +++ OK, passed 100 tests; 15 discarded.
     gmap (id)
       +++ OK, passed 100 tests.
     insNode
@@ -1211,11 +1252,11 @@
     insNodes
       +++ OK, passed 100 tests.
     insEdge
-      +++ OK, passed 100 tests; 15 discarded.
+      +++ OK, passed 100 tests; 13 discarded.
     insEdges
-      +++ OK, passed 100 tests; 15 discarded.
+      +++ OK, passed 100 tests; 13 discarded.
     insEdges (mult)
-      +++ OK, passed 100 tests; 17 discarded.
+      +++ OK, passed 100 tests; 16 discarded.
     delNode
       +++ OK, passed 100 tests.
     delNodes
@@ -1225,7 +1266,7 @@
     delEdges
       +++ OK, passed 100 tests.
     delLEdge
-      +++ OK, passed 100 tests; 15 discarded.
+      +++ OK, passed 100 tests; 13 discarded.
     delAllLEdge
       +++ OK, passed 100 tests.
     valid_mkGraph
@@ -1244,7 +1285,7 @@
       +++ OK, passed 100 tests.
 Queries
   ap
-    +++ OK, passed 100 tests; 19 discarded.
+    +++ OK, passed 100 tests; 15 discarded.
   bcc
     +++ OK, passed 100 tests.
   BFS
@@ -1311,9 +1352,9 @@
     sp
       +++ OK, passed 100 tests.
     sp_Just
-      +++ OK, passed 100 tests; 283 discarded.
+      +++ OK, passed 100 tests; 280 discarded.
     sp_Nothing
-      +++ OK, passed 100 tests; 82 discarded.
+      +++ OK, passed 100 tests; 99 discarded.
   trc
     +++ OK, passed 100 tests.
   tc
@@ -1324,7 +1365,7 @@
   edge projections
     +++ OK, passed 100 tests.
 
-Finished in 5.7212 seconds
+Finished in 6.5544 seconds
 112 examples, 0 failures
 Test suite fgl-tests: PASS
 Test suite logged to: dist-ghc/test/fgl-5.7.0.3-fgl-tests.log
@@ -1352,7 +1393,7 @@
 creating dist-ghc/doc
 creating dist-ghc/doc/html
 creating dist-ghc/doc/html/fgl
-/usr/bin/haddock '@dist-ghc/doc/html/fgl/haddock-response26901-1.txt' '--mathjax=file:///usr/share/javascript/mathjax/MathJax.js'
+/usr/bin/haddock '@dist-ghc/doc/html/fgl/haddock-response2172-1.txt' '--mathjax=file:///usr/share/javascript/mathjax/MathJax.js'
 Warning: 'delAllLedge' is out of scope.
     If you qualify the identifier, haddock can try to link it anyway.
   97% ( 96 / 99) in 'Data.Graph.Inductive.Graph'
@@ -2005,11 +2046,11 @@
 dh_installdeb -plibghc-fgl-dev 
 dh_perl -plibghc-fgl-dev 
 dh_shlibdeps -plibghc-fgl-dev -- --ignore-missing-info
-dpkg-shlibdeps: warning: debian/libghc-fgl-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.0.2/libHSfgl-5.7.0.3-Li8SHU8U7FhEr6od07HBN9-ghc9.0.2.so contains an unresolvable reference to symbol stg_ap_p_info: it's probably a plugin
+dpkg-shlibdeps: warning: debian/libghc-fgl-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.0.2/libHSfgl-5.7.0.3-Li8SHU8U7FhEr6od07HBN9-ghc9.0.2.so contains an unresolvable reference to symbol stg_MUT_ARR_PTRS_FROZEN_DIRTY_info: it's probably a plugin
 dpkg-shlibdeps: warning: 42 other similar warnings have been skipped (use -v to see them all)
-dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-fgl-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.0.2/libHSfgl-5.7.0.3-Li8SHU8U7FhEr6od07HBN9-ghc9.0.2.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-fgl-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.0.2/libHSfgl-5.7.0.3-Li8SHU8U7FhEr6od07HBN9-ghc9.0.2.so was not linked against libHStransformers-0.5.6.2-ghc9.0.2.so (it uses none of the library's symbols)
 dpkg-shlibdeps: warning: package could avoid a useless dependency if debian/libghc-fgl-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.0.2/libHSfgl-5.7.0.3-Li8SHU8U7FhEr6od07HBN9-ghc9.0.2.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-fgl-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.0.2/libHSfgl-5.7.0.3-Li8SHU8U7FhEr6od07HBN9-ghc9.0.2.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-fgl-dev/usr/lib/haskell-packages/ghc/lib/aarch64-linux-ghc-9.0.2/libHSfgl-5.7.0.3-Li8SHU8U7FhEr6od07HBN9-ghc9.0.2.so was not linked against libHSarray-0.5.4.0-ghc9.0.2.so (it uses none of the library's symbols)
 dh_installdeb -plibghc-fgl-prof 
 dh_perl -plibghc-fgl-prof 
@@ -2040,12 +2081,14 @@
 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/4173/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/4173/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/4022 and its subdirectories
-I: Current time: Tue May 21 05:19:49 -12 2024
-I: pbuilder-time-stamp: 1716311989
+I: removing directory /srv/workspace/pbuilder/4173 and its subdirectories
+I: Current time: Thu Apr 20 01:08:34 +14 2023
+I: pbuilder-time-stamp: 1681902514