Diff of the two buildlogs:

--
--- b1/build.log	2025-02-25 17:52:21.863003221 +0000
+++ b2/build.log	2025-02-25 18:03:43.860238744 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Mar 30 12:11:20 -12 2026
-I: pbuilder-time-stamp: 1774915880
+I: Current time: Wed Feb 26 07:52:24 +14 2025
+I: pbuilder-time-stamp: 1740505944
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking imbalanced-learn_0.12.4-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3522412/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3138884/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 Feb 25 17:52 /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/3138884/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3138884/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='6abd2a45fe19459696d309148e8e1699'
-  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='3522412'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=28cceb4d5e664b15aa7223ad1cf1ed9b
+  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=3138884
   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.m6AwwcHs/pbuilderrc_cRex --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.m6AwwcHs/b1 --logfile b1/build.log imbalanced-learn_0.12.4-1.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.m6AwwcHs/pbuilderrc_TY0w --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.m6AwwcHs/b2 --logfile b2/build.log imbalanced-learn_0.12.4-1.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/3522412/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3138884/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -294,7 +326,7 @@
 Get: 161 http://deb.debian.org/debian unstable/main arm64 python3-threadpoolctl all 3.1.0-1 [21.2 kB]
 Get: 162 http://deb.debian.org/debian unstable/main arm64 python3-sklearn-lib arm64 1.4.2+dfsg-7+b1 [5397 kB]
 Get: 163 http://deb.debian.org/debian unstable/main arm64 python3-sklearn all 1.4.2+dfsg-7 [2248 kB]
-Fetched 140 MB in 1s (271 MB/s)
+Fetched 140 MB in 1s (110 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 ... 19889 files and directories currently installed.)
@@ -835,8 +867,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Tue Mar 31 00:11:48 UTC 2026.
-Universal Time is now:  Tue Mar 31 00:11:48 UTC 2026.
+Local time is now:      Tue Feb 25 17:53:32 UTC 2025.
+Universal Time is now:  Tue Feb 25 17:53:32 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up unicode-data (15.1.0-1) ...
@@ -980,7 +1012,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/imbalanced-learn-0.12.4/ && 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  > ../imbalanced-learn_0.12.4-1_source.changes
+I: user script /srv/workspace/pbuilder/3138884/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/3138884/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/imbalanced-learn-0.12.4/ && 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  > ../imbalanced-learn_0.12.4-1_source.changes
 dpkg-buildpackage: info: source package imbalanced-learn
 dpkg-buildpackage: info: source version 0.12.4-1
 dpkg-buildpackage: info: source distribution unstable
@@ -1299,7 +1335,7 @@
 
 .pybuild/cpython3_3.13_imbalanced-learn/build/imblearn/ensemble/tests/test_bagging.py: 4 warnings
 .pybuild/cpython3_3.13_imbalanced-learn/build/imblearn/ensemble/tests/test_easy_ensemble.py: 16 warnings
-  /usr/lib/python3/dist-packages/joblib/externals/loky/backend/fork_exec.py:38: DeprecationWarning: This process (pid=3536867) is multi-threaded, use of fork() may lead to deadlocks in the child.
+  /usr/lib/python3/dist-packages/joblib/externals/loky/backend/fork_exec.py:38: DeprecationWarning: This process (pid=3159405) is multi-threaded, use of fork() may lead to deadlocks in the child.
     pid = os.fork()
 
 .pybuild/cpython3_3.13_imbalanced-learn/build/imblearn/tests/test_common.py::test_estimators_compatibility_sklearn[FunctionSampler()-check_estimator_sparse_data]
@@ -1342,7 +1378,7 @@
 SKIPPED [1] imblearn/utils/tests/test_min_dependencies.py:35: The README.rst file is not available.
 SKIPPED [1] imblearn/utils/tests/test_param_validation.py:660: could not import 'pandas': No module named 'pandas'
 SKIPPED [1] imblearn/utils/tests/test_validation.py:322: could not import 'pandas': No module named 'pandas'
-= 2116 passed, 166 skipped, 4 deselected, 1 xfailed, 4 xpassed, 33 warnings in 167.25s (0:02:47) =
+= 2116 passed, 166 skipped, 4 deselected, 1 xfailed, 4 xpassed, 33 warnings in 522.01s (0:08:42) =
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=pybuild
    dh_prep -O--buildsystem=pybuild
@@ -1806,12 +1842,14 @@
 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/3138884/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3138884/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/3522412 and its subdirectories
-I: Current time: Mon Mar 30 12:15:20 -12 2026
-I: pbuilder-time-stamp: 1774916120
+I: removing directory /srv/workspace/pbuilder/3138884 and its subdirectories
+I: Current time: Wed Feb 26 08:03:42 +14 2025
+I: pbuilder-time-stamp: 1740506622