Diff of the two buildlogs:

--
--- b1/build.log	2025-02-26 09:30:32.102596942 +0000
+++ b2/build.log	2025-02-26 09:52:06.200577036 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Mar 31 03:20:34 -12 2026
-I: pbuilder-time-stamp: 1774970434
+I: Current time: Wed Feb 26 23:30:43 +14 2025
+I: pbuilder-time-stamp: 1740562243
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -37,52 +37,84 @@
 dpkg-source: info: applying doc_local_mathjax.patch
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2507517/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2190316/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 26 09:30 /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/2190316/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2190316/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='771bba8717d54d73a5fccd3e6900f751'
-  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='2507517'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=b2ce26b969a34b6eaaf369317fb3eaf8
+  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=2190316
   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.vH4KMRwG/pbuilderrc_nbEu --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.vH4KMRwG/b1 --logfile b1/build.log h5py_3.13.0-1.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.vH4KMRwG/pbuilderrc_qXlM --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.vH4KMRwG/b2 --logfile b2/build.log h5py_3.13.0-1.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/2507517/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2190316/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -414,7 +446,7 @@
 Get: 253 http://deb.debian.org/debian trixie/main arm64 sphinx-rtd-theme-common all 3.0.2+dfsg-2 [1023 kB]
 Get: 254 http://deb.debian.org/debian trixie/main arm64 python3-sphinxcontrib.jquery all 4.1-5 [7348 B]
 Get: 255 http://deb.debian.org/debian trixie/main arm64 python3-sphinx-rtd-theme all 3.0.2+dfsg-2 [29.7 kB]
-Fetched 172 MB in 2s (86.7 MB/s)
+Fetched 172 MB in 1s (131 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package fonts-lato.
 (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 ... 19914 files and directories currently installed.)
@@ -1229,8 +1261,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Tue Mar 31 15:22:09 UTC 2026.
-Universal Time is now:  Tue Mar 31 15:22:09 UTC 2026.
+Local time is now:      Wed Feb 26 09:32:12 UTC 2025.
+Universal Time is now:  Wed Feb 26 09:32:12 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -1487,7 +1519,11 @@
 fakeroot is already the newest version (1.37-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/h5py-3.13.0/ && 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  > ../h5py_3.13.0-1_source.changes
+I: user script /srv/workspace/pbuilder/2190316/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/2190316/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/h5py-3.13.0/ && 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  > ../h5py_3.13.0-1_source.changes
 dpkg-buildpackage: info: source package h5py
 dpkg-buildpackage: info: source version 3.13.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -2232,7 +2268,7 @@
 Copying h5py.egg-info to build/bdist.linux-aarch64/wheel/./h5py-3.13.0.egg-info
 running install_scripts
 creating build/bdist.linux-aarch64/wheel/h5py-3.13.0.dist-info/WHEEL
-creating '/build/reproducible-path/h5py-3.13.0/.pybuild/cpython3_3.13_h5py_mpi/.tmp-_4xqxzcw/h5py-3.13.0-cp313-cp313-linux_aarch64.whl' and adding 'build/bdist.linux-aarch64/wheel' to it
+creating '/build/reproducible-path/h5py-3.13.0/.pybuild/cpython3_3.13_h5py_mpi/.tmp-xuuvjm0w/h5py-3.13.0-cp313-cp313-linux_aarch64.whl' and adding 'build/bdist.linux-aarch64/wheel' to it
 adding 'h5py/_debian_h5py_mpi/__init__.py'
 adding 'h5py/_debian_h5py_mpi/_conv.cpython-313-aarch64-linux-gnu.so'
 adding 'h5py/_debian_h5py_mpi/_errors.cpython-313-aarch64-linux-gnu.so'
@@ -3025,7 +3061,7 @@
 Copying h5py.egg-info to build/bdist.linux-aarch64/wheel/./h5py-3.13.0.egg-info
 running install_scripts
 creating build/bdist.linux-aarch64/wheel/h5py-3.13.0.dist-info/WHEEL
-creating '/build/reproducible-path/h5py-3.13.0/.pybuild/cpython3_3.13_h5py_serial/.tmp-qeeeglqa/h5py-3.13.0-cp313-cp313-linux_aarch64.whl' and adding 'build/bdist.linux-aarch64/wheel' to it
+creating '/build/reproducible-path/h5py-3.13.0/.pybuild/cpython3_3.13_h5py_serial/.tmp-bu68f9xu/h5py-3.13.0-cp313-cp313-linux_aarch64.whl' and adding 'build/bdist.linux-aarch64/wheel' to it
 adding 'h5py/_debian_h5py_serial/__init__.py'
 adding 'h5py/_debian_h5py_serial/_conv.cpython-313-aarch64-linux-gnu.so'
 adding 'h5py/_debian_h5py_serial/_errors.cpython-313-aarch64-linux-gnu.so'
@@ -4148,7 +4184,7 @@
 build/h5py/_debian_h5py_serial/tests/test_vds/test_virtual_source.py::TestVirtualSource::test_single_range PASSED [ 99%]
 build/h5py/_debian_h5py_serial/tests/test_vds/test_virtual_source.py::TestVirtualSource::test_two_integer_indexed PASSED [100%]
 
-================ 770 passed, 15 skipped, 4 deselected in 24.14s ================
+================ 770 passed, 15 skipped, 4 deselected in 16.96s ================
 set -e; \
 for DIR in $(find /build/reproducible-path/h5py-3.13.0/.pybuild/cpython3*mpi -name build); do \
 	echo "Running MPI tests on $DIR"; \
@@ -4958,43 +4994,41 @@
 mpi4py rc: 
 mpi4py config:
 
-================ 758 passed, 23 skipped, 8 deselected in 11.94s ================
+================ 758 passed, 23 skipped, 8 deselected in 8.58s =================
+============================= test session starts ==============================
+platform linux -- Python 3.13.2, pytest-8.3.4, pluggy-1.5.0 -- /usr/bin/python3.13
 ============================= test session starts ==============================
 platform linux -- Python 3.13.2, pytest-8.3.4, pluggy-1.5.0 -- /usr/bin/python3.13
 cachedir: .pytest_cache
 rootdir: /build/reproducible-path/h5py-3.13.0
 configfile: pytest.ini
 plugins: mpi-0.6, typeguard-4.4.1
-collecting ... ============================= test session starts ==============================
-platform linux -- Python 3.13.2, pytest-8.3.4, pluggy-1.5.0 -- /usr/bin/python3.13
 cachedir: .pytest_cache
-rootdir: /build/reproducible-path/h5py-3.13.0
+collecting ... rootdir: /build/reproducible-path/h5py-3.13.0
 configfile: pytest.ini
 plugins: mpi-0.6, typeguard-4.4.1
-collecting ... 
collected 70 items / 66 deselected / 4 selected                                
+collecting ... 
collected 70 items / 66 deselected / 4 selected                                
collected 70 items / 66 deselected / 4 selected                                
 
-build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_mpio 
collected 70 items / 66 deselected / 4 selected                                
+build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_mpio 
 
 build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_mpio PASSED [ 25%]PASSED [ 25%]
 build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_mpio_append 
-build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_mpio_append PASSED [ 50%]
-build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_mpi_atomic PASSED [ 50%]
-build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_mpi_atomic PASSED [ 75%]PASSED [ 75%]
+build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_mpio_append PASSED [ 50%]PASSED [ 50%]
+build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_mpi_atomic 
+build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_mpi_atomic PASSED [ 75%]
+build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_close_multiple_mpio_driver PASSED [ 75%]
+build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_close_multiple_mpio_driver PASSED [100%]PASSED [100%]
 
-build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_close_multiple_mpio_driver build/h5py/_debian_h5py_mpi/tests/test_file.py::TestMPI::test_close_multiple_mpio_driver PASSED [100%]PASSED [100%]
 =============================== MPI Information ================================
-rank: 0
+rank: 1
 size: 2
 MPI version: 3.1
 MPI library version: Open MPI v5.0.7, package: Debian OpenMPI, ident: 5.0.7, repo rev: v5.0.7, Feb 14, 2025�
 MPI vendor: Open MPI 5.0.6
 mpi4py rc: 
 mpi4py config:
-
-======================= 4 passed, 66 deselected in 0.67s =======================
-
 =============================== MPI Information ================================
-rank: 1
+rank: 0
 size: 2
 MPI version: 3.1
 MPI library version: Open MPI v5.0.7, package: Debian OpenMPI, ident: 5.0.7, repo rev: v5.0.7, Feb 14, 2025�
@@ -5002,7 +5036,9 @@
 mpi4py rc: 
 mpi4py config:
 
-======================= 4 passed, 66 deselected in 0.52s =======================
+
+======================= 4 passed, 66 deselected in 0.62s =======================
+======================= 4 passed, 66 deselected in 0.61s =======================
 make[1]: Leaving directory '/build/reproducible-path/h5py-3.13.0'
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=pybuild
@@ -5092,12 +5128,12 @@
 dpkg-gencontrol: warning: package hdf5-plugin-lzf: substitution variable ${python3:Depends} unused, but is defined
    dh_md5sums -O--buildsystem=pybuild
    dh_builddeb -O--buildsystem=pybuild
-dpkg-deb: building package 'python3-h5py' in '../python3-h5py_3.13.0-1_all.deb'.
-dpkg-deb: building package 'python3-h5py-serial' in '../python3-h5py-serial_3.13.0-1_arm64.deb'.
-dpkg-deb: building package 'python3-h5py-mpi-dbgsym' in '../python3-h5py-mpi-dbgsym_3.13.0-1_arm64.deb'.
 dpkg-deb: building package 'python3-h5py-mpi' in '../python3-h5py-mpi_3.13.0-1_arm64.deb'.
-dpkg-deb: building package 'python3-h5py-serial-dbgsym' in '../python3-h5py-serial-dbgsym_3.13.0-1_arm64.deb'.
+dpkg-deb: building package 'python3-h5py-serial' in '../python3-h5py-serial_3.13.0-1_arm64.deb'.
+dpkg-deb: building package 'python3-h5py' in '../python3-h5py_3.13.0-1_all.deb'.
 dpkg-deb: building package 'python-h5py-doc' in '../python-h5py-doc_3.13.0-1_all.deb'.
+dpkg-deb: building package 'python3-h5py-serial-dbgsym' in '../python3-h5py-serial-dbgsym_3.13.0-1_arm64.deb'.
+dpkg-deb: building package 'python3-h5py-mpi-dbgsym' in '../python3-h5py-mpi-dbgsym_3.13.0-1_arm64.deb'.
 dpkg-deb: building package 'hdf5-plugin-lzf-dbgsym' in '../hdf5-plugin-lzf-dbgsym_3.13.0-1_arm64.deb'.
 dpkg-deb: building package 'hdf5-plugin-lzf' in '../hdf5-plugin-lzf_3.13.0-1_arm64.deb'.
  dpkg-genbuildinfo --build=binary -O../h5py_3.13.0-1_arm64.buildinfo
@@ -5108,12 +5144,14 @@
 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/2190316/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2190316/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/2507517 and its subdirectories
-I: Current time: Tue Mar 31 03:53:29 -12 2026
-I: pbuilder-time-stamp: 1774972409
+I: removing directory /srv/workspace/pbuilder/2190316 and its subdirectories
+I: Current time: Wed Feb 26 23:52:05 +14 2025
+I: pbuilder-time-stamp: 1740563525