Diff of the two buildlogs:

--
--- b1/build.log	2025-03-02 05:11:07.434107498 +0000
+++ b2/build.log	2025-03-02 05:12:44.805694377 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Mar  1 17:06:50 -12 2025
-I: pbuilder-time-stamp: 1740892010
+I: Current time: Sun Apr  5 01:34:09 +14 2026
+I: pbuilder-time-stamp: 1775302449
 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 0001-disable-unsupported-sphinx-extension.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2964321/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/898621/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 Apr  4 11:34 /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/898621/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/898621/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='trixie'
-  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=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='2f6676f9525547dc904e23da83e058d7'
-  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='2964321'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=79090627388c426aa650a29631ed82f3
+  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=898621
   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.gkyntTs1/pbuilderrc_00Dv --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.gkyntTs1/b1 --logfile b1/build.log jsonpickle_4.0.2+dfsg-1.dsc'
-  SUDO_GID='111'
-  SUDO_UID='106'
-  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.gkyntTs1/pbuilderrc_CHl7 --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.gkyntTs1/b2 --logfile b2/build.log jsonpickle_4.0.2+dfsg-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 ionos11-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/2964321/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/898621/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -267,7 +299,7 @@
 Get: 124 http://deb.debian.org/debian trixie/main amd64 python3-sphinx all 8.1.3-5 [468 kB]
 Get: 125 http://deb.debian.org/debian trixie/main amd64 python3-sqlalchemy all 2.0.32+ds1-1 [1196 kB]
 Get: 126 http://deb.debian.org/debian trixie/main amd64 python3-ujson amd64 5.10.0-1+b4 [26.0 kB]
-Fetched 83.4 MB in 9s (9255 kB/s)
+Fetched 83.4 MB in 6s (14.1 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 ... 19802 files and directories currently installed.)
@@ -676,8 +708,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Sun Mar  2 05:08:47 UTC 2025.
-Universal Time is now:  Sun Mar  2 05:08:47 UTC 2025.
+Local time is now:      Sat Apr  4 11:34:42 UTC 2026.
+Universal Time is now:  Sat Apr  4 11:34:42 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -810,7 +842,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/jsonpickle-4.0.2+dfsg/ && 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  > ../jsonpickle_4.0.2+dfsg-1_source.changes
+I: user script /srv/workspace/pbuilder/898621/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/898621/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/jsonpickle-4.0.2+dfsg/ && 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  > ../jsonpickle_4.0.2+dfsg-1_source.changes
 dpkg-buildpackage: info: source package jsonpickle
 dpkg-buildpackage: info: source version 4.0.2+dfsg-1
 dpkg-buildpackage: info: source distribution unstable
@@ -836,20 +872,20 @@
 running build
 running build_py
 creating build/lib/jsonpickle
-copying jsonpickle/__init__.py -> build/lib/jsonpickle
-copying jsonpickle/tags_pd.py -> build/lib/jsonpickle
-copying jsonpickle/handlers.py -> build/lib/jsonpickle
-copying jsonpickle/tags.py -> build/lib/jsonpickle
+copying jsonpickle/version.py -> build/lib/jsonpickle
+copying jsonpickle/backend.py -> build/lib/jsonpickle
+copying jsonpickle/errors.py -> build/lib/jsonpickle
 copying jsonpickle/compat.py -> build/lib/jsonpickle
+copying jsonpickle/__init__.py -> build/lib/jsonpickle
 copying jsonpickle/pickler.py -> build/lib/jsonpickle
 copying jsonpickle/unpickler.py -> build/lib/jsonpickle
-copying jsonpickle/version.py -> build/lib/jsonpickle
+copying jsonpickle/tags.py -> build/lib/jsonpickle
 copying jsonpickle/util.py -> build/lib/jsonpickle
-copying jsonpickle/errors.py -> build/lib/jsonpickle
-copying jsonpickle/backend.py -> build/lib/jsonpickle
+copying jsonpickle/tags_pd.py -> build/lib/jsonpickle
+copying jsonpickle/handlers.py -> build/lib/jsonpickle
 creating build/lib/jsonpickle/ext
-copying jsonpickle/ext/__init__.py -> build/lib/jsonpickle/ext
 copying jsonpickle/ext/pandas.py -> build/lib/jsonpickle/ext
+copying jsonpickle/ext/__init__.py -> build/lib/jsonpickle/ext
 copying jsonpickle/ext/numpy.py -> build/lib/jsonpickle/ext
 copying jsonpickle/ext/gmpy.py -> build/lib/jsonpickle/ext
 running egg_info
@@ -865,27 +901,27 @@
 running install_lib
 creating build/bdist.linux-x86_64/wheel
 creating build/bdist.linux-x86_64/wheel/jsonpickle
-copying build/lib/jsonpickle/__init__.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
-copying build/lib/jsonpickle/tags_pd.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
-copying build/lib/jsonpickle/handlers.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
-copying build/lib/jsonpickle/tags.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
-copying build/lib/jsonpickle/compat.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
-copying build/lib/jsonpickle/pickler.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
-copying build/lib/jsonpickle/unpickler.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
 copying build/lib/jsonpickle/version.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
 creating build/bdist.linux-x86_64/wheel/jsonpickle/ext
-copying build/lib/jsonpickle/ext/__init__.py -> build/bdist.linux-x86_64/wheel/./jsonpickle/ext
 copying build/lib/jsonpickle/ext/pandas.py -> build/bdist.linux-x86_64/wheel/./jsonpickle/ext
+copying build/lib/jsonpickle/ext/__init__.py -> build/bdist.linux-x86_64/wheel/./jsonpickle/ext
 copying build/lib/jsonpickle/ext/numpy.py -> build/bdist.linux-x86_64/wheel/./jsonpickle/ext
 copying build/lib/jsonpickle/ext/gmpy.py -> build/bdist.linux-x86_64/wheel/./jsonpickle/ext
-copying build/lib/jsonpickle/util.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
-copying build/lib/jsonpickle/errors.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
 copying build/lib/jsonpickle/backend.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
+copying build/lib/jsonpickle/errors.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
+copying build/lib/jsonpickle/compat.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
+copying build/lib/jsonpickle/__init__.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
+copying build/lib/jsonpickle/pickler.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
+copying build/lib/jsonpickle/unpickler.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
+copying build/lib/jsonpickle/tags.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
+copying build/lib/jsonpickle/util.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
+copying build/lib/jsonpickle/tags_pd.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
+copying build/lib/jsonpickle/handlers.py -> build/bdist.linux-x86_64/wheel/./jsonpickle
 running install_egg_info
 Copying jsonpickle.egg-info to build/bdist.linux-x86_64/wheel/./jsonpickle-4.0.2+dfsg.egg-info
 running install_scripts
 creating build/bdist.linux-x86_64/wheel/jsonpickle-4.0.2+dfsg.dist-info/WHEEL
-creating '/build/reproducible-path/jsonpickle-4.0.2+dfsg/.pybuild/cpython3_3.13/.tmp-6n9e2vty/jsonpickle-4.0.2+dfsg-py3-none-any.whl' and adding 'build/bdist.linux-x86_64/wheel' to it
+creating '/build/reproducible-path/jsonpickle-4.0.2+dfsg/.pybuild/cpython3_3.13/.tmp-qm6u61zn/jsonpickle-4.0.2+dfsg-py3-none-any.whl' and adding 'build/bdist.linux-x86_64/wheel' to it
 adding 'jsonpickle/__init__.py'
 adding 'jsonpickle/backend.py'
 adding 'jsonpickle/compat.py'
@@ -961,7 +997,7 @@
     warnings.warn(msg)
 
 -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
-================= 382 passed, 4 skipped, 10 warnings in 8.99s ==================
+================= 382 passed, 4 skipped, 10 warnings in 5.19s ==================
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=pybuild
    dh_prep -O--buildsystem=pybuild
@@ -995,9 +1031,9 @@
 preparing documents... done
 copying assets... 
 copying static files... 
+Writing evaluated template result to /build/reproducible-path/jsonpickle-4.0.2+dfsg/debian/python-jsonpickle-doc/usr/share/doc/python-jsonpickle-doc/html/_static/documentation_options.js
 Writing evaluated template result to /build/reproducible-path/jsonpickle-4.0.2+dfsg/debian/python-jsonpickle-doc/usr/share/doc/python-jsonpickle-doc/html/_static/language_data.js
 Writing evaluated template result to /build/reproducible-path/jsonpickle-4.0.2+dfsg/debian/python-jsonpickle-doc/usr/share/doc/python-jsonpickle-doc/html/_static/basic.css
-Writing evaluated template result to /build/reproducible-path/jsonpickle-4.0.2+dfsg/debian/python-jsonpickle-doc/usr/share/doc/python-jsonpickle-doc/html/_static/documentation_options.js
 Writing evaluated template result to /build/reproducible-path/jsonpickle-4.0.2+dfsg/debian/python-jsonpickle-doc/usr/share/doc/python-jsonpickle-doc/html/_static/alabaster.css
 copying static files: done
 copying extra files... 
@@ -1042,8 +1078,8 @@
    dh_missing -O--buildsystem=pybuild
    dh_installdeb -O--buildsystem=pybuild
    dh_gencontrol -O--buildsystem=pybuild
-dpkg-gencontrol: warning: package python-jsonpickle-doc: substitution variable ${sphinxdoc:Built-Using} unused, but is defined
 dpkg-gencontrol: warning: Depends field of package python3-jsonpickle: substitution variable ${shlibs:Depends} used, but is not defined
+dpkg-gencontrol: warning: package python-jsonpickle-doc: substitution variable ${sphinxdoc:Built-Using} unused, but is defined
    dh_md5sums -O--buildsystem=pybuild
    dh_builddeb -O--buildsystem=pybuild
 dpkg-deb: building package 'python3-jsonpickle' in '../python3-jsonpickle_4.0.2+dfsg-1_all.deb'.
@@ -1056,12 +1092,14 @@
 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/898621/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/898621/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/2964321 and its subdirectories
-I: Current time: Sat Mar  1 17:11:06 -12 2025
-I: pbuilder-time-stamp: 1740892266
+I: removing directory /srv/workspace/pbuilder/898621 and its subdirectories
+I: Current time: Sun Apr  5 01:35:43 +14 2026
+I: pbuilder-time-stamp: 1775302543