Diff of the two buildlogs:

--
--- b1/build.log	2025-02-22 18:50:03.074436609 +0000
+++ b2/build.log	2025-02-22 18:54:20.774763640 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri Mar 27 13:07:19 -12 2026
-I: pbuilder-time-stamp: 1774660039
+I: Current time: Sun Feb 23 08:50:06 +14 2025
+I: pbuilder-time-stamp: 1740250206
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -24,52 +24,84 @@
 dpkg-source: info: applying internal_pdbcmd.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/211995/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3966834/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 22 18:50 /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/3966834/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3966834/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='544a4501a5ab4017bcf6278ab62538e3'
-  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='211995'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=74f1ec78c210446ab0760ed45afb5d79
+  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=3966834
   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.UbbdeGGu/pbuilderrc_FeB1 --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.UbbdeGGu/b1 --logfile b1/build.log spyder-kernels_3.0.2-1.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.UbbdeGGu/pbuilderrc_URZW --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.UbbdeGGu/b2 --logfile b2/build.log spyder-kernels_3.0.2-1.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/211995/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3966834/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -82,7 +114,7 @@
 Depends: debhelper-compat (= 13), dh-python, dh-sequence-python3, python3-all, python3-cloudpickle, python3-distributed, python3-django, python3-flaky, python3-h5py, python3-ipykernel (<< 7~), python3-ipykernel (>= 6.29.3), python3-ipython (>= 8.13.0), python3-jupyter-client (<< 9~), python3-jupyter-client (>= 7.4.9), python3-matplotlib, python3-numpy, python3-pandas, python3-pillow, python3-pydicom, python3-pytest, python3-scipy, python3-setuptools, python3-wurlitzer (>= 1.0.3~), python3-xarray, python3-xdg, python3-zmq (>= 24.0.0)
 dpkg-deb: building package 'pbuilder-satisfydepends-dummy' in '/tmp/satisfydepends-aptitude/pbuilder-satisfydepends-dummy.deb'.
 Selecting previously unselected package pbuilder-satisfydepends-dummy.
-(Reading database ... 19922 files and directories currently installed.)
+(Reading database ... 19972 files and directories currently installed.)
 Preparing to unpack .../pbuilder-satisfydepends-dummy.deb ...
 Unpacking pbuilder-satisfydepends-dummy (0.invalid.0) ...
 dpkg: pbuilder-satisfydepends-dummy: dependency problems, but configuring anyway as you requested:
@@ -402,10 +434,10 @@
 Get: 245 http://deb.debian.org/debian trixie/main arm64 python3-wurlitzer all 3.1.1-1 [13.6 kB]
 Get: 246 http://deb.debian.org/debian trixie/main arm64 python3-xarray all 2025.01.2-1 [800 kB]
 Get: 247 http://deb.debian.org/debian trixie/main arm64 python3-xdg all 0.28-2 [40.5 kB]
-Fetched 138 MB in 1s (127 MB/s)
+Fetched 138 MB in 1s (228 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libtext-charwidth-perl:arm64.
-(Reading database ... 
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+(Reading database ... 
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(Reading database ... 19972 files and directories currently installed.)
 Preparing to unpack .../0-libtext-charwidth-perl_0.04-11+b4_arm64.deb ...
 Unpacking libtext-charwidth-perl:arm64 (0.04-11+b4) ...
 Selecting previously unselected package libtext-wrapi18n-perl.
@@ -440,7 +472,7 @@
 Setting up libexpat1:arm64 (2.6.4-1) ...
 Setting up python3.13-minimal (3.13.2-1) ...
 Selecting previously unselected package python3-minimal.
-(Reading database ... 
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(Reading database ... 20528 files and directories currently installed.)
+(Reading database ... 
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(Reading database ... 20578 files and directories currently installed.)
 Preparing to unpack .../0-python3-minimal_3.13.1-2_arm64.deb ...
 Unpacking python3-minimal (3.13.1-2) ...
 Selecting previously unselected package media-types.
@@ -476,7 +508,7 @@
 Unpacking libpython3-stdlib:arm64 (3.13.1-2) ...
 Setting up python3-minimal (3.13.1-2) ...
 Selecting previously unselected package python3.
-(Reading database ... 
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(Reading database ... 21538 files and directories currently installed.)
+(Reading database ... 
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 Preparing to unpack .../000-python3_3.13.1-2_arm64.deb ...
 Unpacking python3 (3.13.1-2) ...
 Selecting previously unselected package libpython3.12-minimal:arm64.
@@ -1206,8 +1238,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Sat Mar 28 01:08:24 UTC 2026.
-Universal Time is now:  Sat Mar 28 01:08:24 UTC 2026.
+Local time is now:      Sat Feb 22 18:50:41 UTC 2025.
+Universal Time is now:  Sat Feb 22 18:50:41 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up unicode-data (15.1.0-1) ...
@@ -1432,7 +1464,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/spyder-kernels-3.0.2/ && 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  > ../spyder-kernels_3.0.2-1_source.changes
+I: user script /srv/workspace/pbuilder/3966834/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/3966834/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/spyder-kernels-3.0.2/ && 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  > ../spyder-kernels_3.0.2-1_source.changes
 dpkg-buildpackage: info: source package spyder-kernels
 dpkg-buildpackage: info: source version 3.0.2-1
 dpkg-buildpackage: info: source distribution unstable
@@ -1622,7 +1658,7 @@
 test_debug_namespace passed 1 out of the required 1 times. Success!
 
 ===End Flaky Test Report===
-===== 96 passed, 6 skipped, 1 deselected, 11 warnings in 62.48s (0:01:02) ======
+========== 96 passed, 6 skipped, 1 deselected, 11 warnings in 46.27s ===========
 I: pybuild base:311: cd /build/reproducible-path/spyder-kernels-3.0.2/.pybuild/cpython3_3.13_spyder-kernels/build; python3.13 -m pytest --ignore customize/tests/test_umr.py -k "not test_dask_multiprocessing"
 ============================= test session starts ==============================
 platform linux -- Python 3.13.2, pytest-8.3.4, pluggy-1.5.0
@@ -1682,7 +1718,7 @@
 test_debug_namespace passed 1 out of the required 1 times. Success!
 
 ===End Flaky Test Report===
-========== 96 passed, 6 skipped, 1 deselected, 11 warnings in 55.72s ===========
+========== 96 passed, 6 skipped, 1 deselected, 11 warnings in 47.99s ===========
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=pybuild
    dh_prep -O--buildsystem=pybuild
@@ -1973,12 +2009,14 @@
 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/3966834/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3966834/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/211995 and its subdirectories
-I: Current time: Fri Mar 27 13:13:01 -12 2026
-I: pbuilder-time-stamp: 1774660381
+I: removing directory /srv/workspace/pbuilder/3966834 and its subdirectories
+I: Current time: Sun Feb 23 08:54:19 +14 2025
+I: pbuilder-time-stamp: 1740250459