Diff of the two buildlogs:

--
--- b1/build.log	2025-02-14 09:21:53.167368602 +0000
+++ b2/build.log	2025-02-14 09:29:34.118628204 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Feb 13 20:53:43 -12 2025
-I: pbuilder-time-stamp: 1739523223
+I: Current time: Fri Mar 20 05:44:55 +14 2026
+I: pbuilder-time-stamp: 1773935095
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -24,52 +24,84 @@
 dpkg-source: info: applying Fix-warning-type-in-test_image_collection.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/715820/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3521863/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos15-amd64.
+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 19 15:45 /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/3521863/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3521863/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='amd64'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=20 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='amd64'
+  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]="x86_64-pc-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=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=42 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='c98c3e4688f247eeb399b7ce79f9d1bd'
-  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='715820'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=3704f54db637448a8de45082b8623deb
+  LANG=C
+  LANGUAGE=et_EE:et
+  LC_ALL=C
+  MACHTYPE=x86_64-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=3521863
   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.QRFDCf6A/pbuilderrc_cOto --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.QRFDCf6A/b1 --logfile b1/build.log ccdproc_2.4.3-1.dsc'
-  SUDO_GID='110'
-  SUDO_UID='105'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://46.16.76.132:3128'
+  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.QRFDCf6A/pbuilderrc_c4dF --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.QRFDCf6A/b2 --logfile b2/build.log ccdproc_2.4.3-1.dsc'
+  SUDO_GID=111
+  SUDO_UID=106
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://213.165.73.152:3128
 I: uname -a
-  Linux ionos1-amd64 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.12.9+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.9-1~bpo12+1 (2025-01-19) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/715820/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3521863/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -382,7 +414,7 @@
 Get: 245 http://deb.debian.org/debian unstable/main amd64 python3-skimage-lib amd64 0.25.1-1 [4324 kB]
 Get: 246 http://deb.debian.org/debian unstable/main amd64 python3-tifffile all 20250110-1 [186 kB]
 Get: 247 http://deb.debian.org/debian unstable/main amd64 python3-skimage all 0.25.1-1 [20.6 MB]
-Fetched 174 MB in 15s (12.0 MB/s)
+Fetched 174 MB in 4s (46.8 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.13-minimal:amd64.
 (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 ... 19808 files and directories currently installed.)
@@ -1182,8 +1214,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Fri Feb 14 08:59:24 UTC 2025.
-Universal Time is now:  Fri Feb 14 08:59:24 UTC 2025.
+Local time is now:      Thu Mar 19 15:46:19 UTC 2026.
+Universal Time is now:  Thu Mar 19 15:46:19 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up unicode-data (15.1.0-1) ...
@@ -1414,7 +1446,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/ccdproc-2.4.3/ && 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  > ../ccdproc_2.4.3-1_source.changes
+I: user script /srv/workspace/pbuilder/3521863/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/3521863/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/ccdproc-2.4.3/ && 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  > ../ccdproc_2.4.3-1_source.changes
 dpkg-buildpackage: info: source package ccdproc
 dpkg-buildpackage: info: source version 2.4.3-1
 dpkg-buildpackage: info: source distribution unstable
@@ -1450,9 +1486,9 @@
 Running tests with ccdproc version dev.
 Running tests in ccdproc.
 
-Date: 2025-02-13T21:16:32
+Date: 2026-03-20T05:50:23
 
-Platform: Linux-6.1.0-31-amd64-x86_64-with-glibc2.40
+Platform: Linux-6.12.9+bpo-amd64-x86_64-with-glibc2.40
 
 Executable: /usr/bin/python3.12
 
@@ -1477,7 +1513,7 @@
 rootdir: /build/reproducible-path/ccdproc-2.4.3/.pybuild/cpython3_3.12_ccdproc/build
 configfile: pyproject.toml
 testpaths: ccdproc, docs
-plugins: filter-subpackage-0.2.0, mock-3.14.0, astropy-0.11.0, astropy-header-0.2.2, hypothesis-6.125.2, arraydiff-0.6.1, remotedata-0.4.1, cov-5.0.0, typeguard-4.4.1, doctestplus-1.4.0
+plugins: cov-5.0.0, typeguard-4.4.1, astropy-header-0.2.2, filter-subpackage-0.2.0, hypothesis-6.125.2, doctestplus-1.4.0, remotedata-0.4.1, astropy-0.11.0, mock-3.14.0, arraydiff-0.6.1
 collected 332 items / 3 skipped
 
 ccdproc/combiner.py .                                                    [  0%]
@@ -1504,7 +1540,7 @@
 =========================== short test summary info ============================
 SKIPPED [3] ccdproc/tests/run_for_memory_profile.py:3: could not import 'memory_profiler': No module named 'memory_profiler'
 SKIPPED [2] ../../../../../../usr/lib/python3/dist-packages/_pytest/doctest.py:458: all tests skipped by +SKIP option
-================== 330 passed, 5 skipped in 156.69s (0:02:36) ==================
+================== 330 passed, 5 skipped in 63.07s (0:01:03) ===================
 I: pybuild base:311: cd /build/reproducible-path/ccdproc-2.4.3/.pybuild/cpython3_3.13_ccdproc/build; python3.13 -m pytest 
 ============================= test session starts ==============================
 platform linux -- Python 3.13.2, pytest-8.3.4, pluggy-1.5.0
@@ -1512,9 +1548,9 @@
 Running tests with ccdproc version dev.
 Running tests in ccdproc.
 
-Date: 2025-02-13T21:19:21
+Date: 2026-03-20T05:51:29
 
-Platform: Linux-6.1.0-31-amd64-x86_64-with-glibc2.40
+Platform: Linux-6.12.9+bpo-amd64-x86_64-with-glibc2.40
 
 Executable: /usr/bin/python3.13
 
@@ -1539,7 +1575,7 @@
 rootdir: /build/reproducible-path/ccdproc-2.4.3/.pybuild/cpython3_3.13_ccdproc/build
 configfile: pyproject.toml
 testpaths: ccdproc, docs
-plugins: filter-subpackage-0.2.0, mock-3.14.0, astropy-0.11.0, astropy-header-0.2.2, hypothesis-6.125.2, arraydiff-0.6.1, remotedata-0.4.1, cov-5.0.0, typeguard-4.4.1, doctestplus-1.4.0
+plugins: cov-5.0.0, typeguard-4.4.1, astropy-header-0.2.2, filter-subpackage-0.2.0, hypothesis-6.125.2, doctestplus-1.4.0, remotedata-0.4.1, astropy-0.11.0, mock-3.14.0, arraydiff-0.6.1
 collected 332 items / 3 skipped
 
 ccdproc/combiner.py .                                                    [  0%]
@@ -1566,7 +1602,7 @@
 =========================== short test summary info ============================
 SKIPPED [3] ccdproc/tests/run_for_memory_profile.py:3: could not import 'memory_profiler': No module named 'memory_profiler'
 SKIPPED [2] ../../../../../../usr/lib/python3/dist-packages/_pytest/doctest.py:458: all tests skipped by +SKIP option
-================== 330 passed, 5 skipped in 127.20s (0:02:07) ==================
+======================= 330 passed, 5 skipped in 49.47s ========================
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=pybuild
    dh_prep -O--buildsystem=pybuild
@@ -1595,12 +1631,14 @@
 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/3521863/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3521863/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/715820 and its subdirectories
-I: Current time: Thu Feb 13 21:21:52 -12 2025
-I: pbuilder-time-stamp: 1739524912
+I: removing directory /srv/workspace/pbuilder/3521863 and its subdirectories
+I: Current time: Fri Mar 20 05:52:32 +14 2026
+I: pbuilder-time-stamp: 1773935552