Diff of the two buildlogs:

--
--- b1/build.log	2024-04-26 01:35:35.949685005 +0000
+++ b2/build.log	2024-04-26 01:36:33.403235233 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Apr 25 13:32:42 -12 2024
-I: pbuilder-time-stamp: 1714095162
+I: Current time: Thu May 29 21:58:38 +14 2025
+I: pbuilder-time-stamp: 1748505518
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking ros-eigen-stl-containers_0.1.8-4.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3993307/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3038441/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos5-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 May 29 07:58 /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/3038441/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3038441/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]="21" [3]="1" [4]="release" [5]="x86_64-pc-linux-gnu")
+  BASH_VERSION='5.2.21(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='8352d3115a0049ada28aad5e83923116'
-  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='3993307'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=e1fe09883caa462ca6f604d462328a0c
+  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=3038441
   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.n8XFO19g/pbuilderrc_SqIE --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.n8XFO19g/b1 --logfile b1/build.log ros-eigen-stl-containers_0.1.8-4.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.n8XFO19g/pbuilderrc_rTiW --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.n8XFO19g/b2 --logfile b2/build.log ros-eigen-stl-containers_0.1.8-4.dsc'
+  SUDO_GID=110
+  SUDO_UID=105
+  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 6.1.0-20-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.85-1 (2024-04-11) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Apr 22 12:43 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3993307/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 25 19:07 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3038441/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -270,7 +302,7 @@
 Get: 85 http://deb.debian.org/debian trixie/main amd64 po-debconf all 1.0.21+nmu1 [248 kB]
 Get: 86 http://deb.debian.org/debian trixie/main amd64 debhelper all 13.15.3 [901 kB]
 Get: 87 http://deb.debian.org/debian trixie/main amd64 libeigen3-dev all 3.4.0-4 [1041 kB]
-Fetched 48.2 MB in 8s (5820 kB/s)
+Fetched 48.2 MB in 0s (144 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 dpkg: libnettle8:amd64: dependency problems, but removing anyway as you requested:
  libhogweed6:amd64 depends on libnettle8.
@@ -592,8 +624,8 @@
 Setting up tzdata (2024a-3) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Fri Apr 26 01:34:48 UTC 2024.
-Universal Time is now:  Fri Apr 26 01:34:48 UTC 2024.
+Local time is now:      Thu May 29 07:59:19 UTC 2025.
+Universal Time is now:  Thu May 29 07:59:19 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -673,7 +705,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/ros-eigen-stl-containers-0.1.8/ && 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  > ../ros-eigen-stl-containers_0.1.8-4_source.changes
+I: user script /srv/workspace/pbuilder/3038441/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/3038441/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/ros-eigen-stl-containers-0.1.8/ && 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  > ../ros-eigen-stl-containers_0.1.8-4_source.changes
 dpkg-buildpackage: info: source package ros-eigen-stl-containers
 dpkg-buildpackage: info: source version 0.1.8-4
 dpkg-buildpackage: info: source distribution unstable
@@ -737,7 +773,7 @@
 -- Found Threads: TRUE  
 -- catkin 0.8.10
 -- BUILD_SHARED_LIBS is on
--- Configuring done (2.5s)
+-- Configuring done (1.3s)
 -- Generating done (0.0s)
 CMake Warning:
   Manually-specified variables were not used by the project:
@@ -749,7 +785,7 @@
 
 -- Build files have been written to: /build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu
    dh_auto_build
-	cd obj-x86_64-linux-gnu && make -j20 "INSTALL=install --strip-program=true" VERBOSE=1
+	cd obj-x86_64-linux-gnu && make -j42 "INSTALL=install --strip-program=true" VERBOSE=1
 make[1]: Entering directory '/build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu'
 /usr/bin/cmake -S/build/reproducible-path/ros-eigen-stl-containers-0.1.8 -B/build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu --check-build-system CMakeFiles/Makefile.cmake 0
 /usr/bin/cmake -E cmake_progress_start /build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu/CMakeFiles /build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu//CMakeFiles/progress.marks
@@ -760,10 +796,10 @@
 /usr/bin/cmake -E cmake_progress_start /build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu/CMakeFiles 0
 make[1]: Leaving directory '/build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu'
    dh_auto_test
-	cd obj-x86_64-linux-gnu && make -j20 test ARGS\+=--verbose ARGS\+=-j20
+	cd obj-x86_64-linux-gnu && make -j42 test ARGS\+=--verbose ARGS\+=-j42
 make[1]: Entering directory '/build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu'
 Running tests...
-/usr/bin/ctest --force-new-ctest-process --verbose -j20
+/usr/bin/ctest --force-new-ctest-process --verbose -j42
 UpdateCTestConfiguration  from :/build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu/CTestConfiguration.ini
 Parse Config file:/build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu/CTestConfiguration.ini
  Add coverage exclude regular expressions.
@@ -781,7 +817,7 @@
    create-stamp debian/debhelper-build-stamp
    dh_prep
    dh_auto_install --destdir=debian/libeigen-stl-containers-dev/
-	cd obj-x86_64-linux-gnu && make -j20 install DESTDIR=/build/reproducible-path/ros-eigen-stl-containers-0.1.8/debian/libeigen-stl-containers-dev AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true"
+	cd obj-x86_64-linux-gnu && make -j42 install DESTDIR=/build/reproducible-path/ros-eigen-stl-containers-0.1.8/debian/libeigen-stl-containers-dev AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true"
 make[1]: Entering directory '/build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu'
 /usr/bin/cmake -S/build/reproducible-path/ros-eigen-stl-containers-0.1.8 -B/build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu --check-build-system CMakeFiles/Makefile.cmake 0
 make  -f CMakeFiles/Makefile2 preinstall
@@ -796,9 +832,9 @@
 -- Installing: /build/reproducible-path/ros-eigen-stl-containers-0.1.8/debian/libeigen-stl-containers-dev/usr/share/eigen_stl_containers/cmake/eigen_stl_containersConfig-version.cmake
 -- Installing: /build/reproducible-path/ros-eigen-stl-containers-0.1.8/debian/libeigen-stl-containers-dev/usr/share/eigen_stl_containers/package.xml
 -- Installing: /build/reproducible-path/ros-eigen-stl-containers-0.1.8/debian/libeigen-stl-containers-dev/usr/include/eigen_stl_containers
--- Installing: /build/reproducible-path/ros-eigen-stl-containers-0.1.8/debian/libeigen-stl-containers-dev/usr/include/eigen_stl_containers/eigen_stl_map_container.h
--- Installing: /build/reproducible-path/ros-eigen-stl-containers-0.1.8/debian/libeigen-stl-containers-dev/usr/include/eigen_stl_containers/eigen_stl_vector_container.h
 -- Installing: /build/reproducible-path/ros-eigen-stl-containers-0.1.8/debian/libeigen-stl-containers-dev/usr/include/eigen_stl_containers/eigen_stl_containers.h
+-- Installing: /build/reproducible-path/ros-eigen-stl-containers-0.1.8/debian/libeigen-stl-containers-dev/usr/include/eigen_stl_containers/eigen_stl_vector_container.h
+-- Installing: /build/reproducible-path/ros-eigen-stl-containers-0.1.8/debian/libeigen-stl-containers-dev/usr/include/eigen_stl_containers/eigen_stl_map_container.h
 make[1]: Leaving directory '/build/reproducible-path/ros-eigen-stl-containers-0.1.8/obj-x86_64-linux-gnu'
    dh_installdocs
    dh_installchangelogs
@@ -821,12 +857,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: not including original source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/3038441/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3038441/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/3993307 and its subdirectories
-I: Current time: Thu Apr 25 13:35:35 -12 2024
-I: pbuilder-time-stamp: 1714095335
+I: removing directory /srv/workspace/pbuilder/3038441 and its subdirectories
+I: Current time: Thu May 29 21:59:32 +14 2025
+I: pbuilder-time-stamp: 1748505572