Diff of the two buildlogs:

--
--- b1/build.log	2025-01-10 12:10:31.752868308 +0000
+++ b2/build.log	2025-01-10 12:18:32.007093760 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri Jan 10 00:05:15 -12 2025
-I: pbuilder-time-stamp: 1736510715
+I: Current time: Sat Jan 11 02:10:42 +14 2025
+I: pbuilder-time-stamp: 1736511042
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking pybind11-json_0.2.13-4.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/8313/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/7951/tmp/hooks/D01_modify_environment starting
+debug: Running on ff64a.
+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 Jan 10 12:11 /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/7951/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/7951/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='armhf'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=3 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='armhf'
+  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]="arm-unknown-linux-gnueabihf")
+  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=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=6 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='bbe9d75e65984ade88639cca65e3ede9'
-  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='8313'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=b58e2ce8add04aec9279491328f9776e
+  LANG=C
+  LANGUAGE=it_CH:it
+  LC_ALL=C
+  MACHTYPE=arm-unknown-linux-gnueabihf
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnueabihf
+  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=7951
   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.o2fz3MYY/pbuilderrc_eR26 --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.o2fz3MYY/b1 --logfile b1/build.log pybind11-json_0.2.13-4.dsc'
-  SUDO_GID='110'
-  SUDO_UID='103'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://10.0.0.15:3142/'
+  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.o2fz3MYY/pbuilderrc_HlN7 --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.o2fz3MYY/b2 --logfile b2/build.log pybind11-json_0.2.13-4.dsc'
+  SUDO_GID=114
+  SUDO_UID=109
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://10.0.0.15:3142/
 I: uname -a
-  Linux virt32z 6.1.0-28-armmp-lpae #1 SMP Debian 6.1.119-1 (2024-11-22) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-28-arm64 #1 SMP Debian 6.1.119-1 (2024-11-22) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/8313/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/7951/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -197,7 +229,7 @@
 Get: 82 http://deb.debian.org/debian unstable/main armhf pybind11-dev all 2.13.6-1 [204 kB]
 Get: 83 http://deb.debian.org/debian unstable/main armhf python3.13-dev armhf 3.13.1-3 [504 kB]
 Get: 84 http://deb.debian.org/debian unstable/main armhf python3-dev armhf 3.13.1-2 [26.1 kB]
-Fetched 47.7 MB in 9s (5212 kB/s)
+Fetched 47.7 MB in 2s (21.1 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.13-minimal:armhf.
 (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 ... 19562 files and directories currently installed.)
@@ -485,8 +517,8 @@
 Setting up tzdata (2024b-5) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Fri Jan 10 12:06:47 UTC 2025.
-Universal Time is now:  Fri Jan 10 12:06:47 UTC 2025.
+Local time is now:      Fri Jan 10 12:12:35 UTC 2025.
+Universal Time is now:  Fri Jan 10 12:12:35 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -560,7 +592,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/pybind11-json-0.2.13/ && 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  > ../pybind11-json_0.2.13-4_source.changes
+I: user script /srv/workspace/pbuilder/7951/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/7951/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/pybind11-json-0.2.13/ && 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  > ../pybind11-json_0.2.13-4_source.changes
 dpkg-buildpackage: info: source package pybind11-json
 dpkg-buildpackage: info: source version 0.2.13-4
 dpkg-buildpackage: info: source distribution unstable
@@ -639,7 +675,7 @@
   to work with policies introduced by <max> or earlier.
 
 
--- Configuring done (0.1s)
+-- Configuring done (0.3s)
 -- Generating done (0.0s)
 -- Build files have been written to: /build/reproducible-path/pybind11-json-0.2.13/obj-arm-linux-gnueabihf/test/googletest-download
 gmake[2]: Entering directory '/build/reproducible-path/pybind11-json-0.2.13/obj-arm-linux-gnueabihf/test/googletest-download'
@@ -657,8 +693,8 @@
 -- Performing Test CMAKE_HAVE_LIBC_PTHREAD
 -- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success
 -- Found Threads: TRUE
--- Configuring done (8.6s)
--- Generating done (0.0s)
+-- Configuring done (10.2s)
+-- Generating done (0.1s)
 CMake Warning:
   Manually-specified variables were not used by the project:
 
@@ -670,7 +706,7 @@
 -- Build files have been written to: /build/reproducible-path/pybind11-json-0.2.13/obj-arm-linux-gnueabihf
 make[1]: Leaving directory '/build/reproducible-path/pybind11-json-0.2.13'
    dh_auto_build
-	cd obj-arm-linux-gnueabihf && make -j3 "INSTALL=install --strip-program=true" VERBOSE=1
+	cd obj-arm-linux-gnueabihf && make -j6 "INSTALL=install --strip-program=true" VERBOSE=1
 make[1]: Entering directory '/build/reproducible-path/pybind11-json-0.2.13/obj-arm-linux-gnueabihf'
 /usr/bin/cmake -S/build/reproducible-path/pybind11-json-0.2.13 -B/build/reproducible-path/pybind11-json-0.2.13/obj-arm-linux-gnueabihf --check-build-system CMakeFiles/Makefile.cmake 0
 /usr/bin/cmake -E cmake_progress_start /build/reproducible-path/pybind11-json-0.2.13/obj-arm-linux-gnueabihf/CMakeFiles /build/reproducible-path/pybind11-json-0.2.13/obj-arm-linux-gnueabihf//CMakeFiles/progress.marks
@@ -785,80 +821,80 @@
 [----------] Global test environment set-up.
 [----------] 17 tests from nljson_serializers_tojson
 [ RUN      ] nljson_serializers_tojson.none
-[       OK ] nljson_serializers_tojson.none (328 ms)
+[       OK ] nljson_serializers_tojson.none (106 ms)
 [ RUN      ] nljson_serializers_tojson.bool_
-[       OK ] nljson_serializers_tojson.bool_ (88 ms)
+[       OK ] nljson_serializers_tojson.bool_ (99 ms)
 [ RUN      ] nljson_serializers_tojson.integer
-[       OK ] nljson_serializers_tojson.integer (74 ms)
+[       OK ] nljson_serializers_tojson.integer (100 ms)
 [ RUN      ] nljson_serializers_tojson.float_
-[       OK ] nljson_serializers_tojson.float_ (118 ms)
+[       OK ] nljson_serializers_tojson.float_ (100 ms)
 [ RUN      ] nljson_serializers_tojson.string
-[       OK ] nljson_serializers_tojson.string (110 ms)
+[       OK ] nljson_serializers_tojson.string (103 ms)
 [ RUN      ] nljson_serializers_tojson.list
-[       OK ] nljson_serializers_tojson.list (53 ms)
+[       OK ] nljson_serializers_tojson.list (104 ms)
 [ RUN      ] nljson_serializers_tojson.empty_list
-[       OK ] nljson_serializers_tojson.empty_list (32 ms)
+[       OK ] nljson_serializers_tojson.empty_list (102 ms)
 [ RUN      ] nljson_serializers_tojson.tuple
-[       OK ] nljson_serializers_tojson.tuple (67 ms)
+[       OK ] nljson_serializers_tojson.tuple (105 ms)
 [ RUN      ] nljson_serializers_tojson.dict
-[       OK ] nljson_serializers_tojson.dict (123 ms)
+[       OK ] nljson_serializers_tojson.dict (105 ms)
 [ RUN      ] nljson_serializers_tojson.empty_dict
-[       OK ] nljson_serializers_tojson.empty_dict (79 ms)
+[       OK ] nljson_serializers_tojson.empty_dict (104 ms)
 [ RUN      ] nljson_serializers_tojson.nested
-[       OK ] nljson_serializers_tojson.nested (83 ms)
+[       OK ] nljson_serializers_tojson.nested (104 ms)
 [ RUN      ] nljson_serializers_tojson.handle
-[       OK ] nljson_serializers_tojson.handle (157 ms)
+[       OK ] nljson_serializers_tojson.handle (104 ms)
 [ RUN      ] nljson_serializers_tojson.list_accessor
-[       OK ] nljson_serializers_tojson.list_accessor (77 ms)
+[       OK ] nljson_serializers_tojson.list_accessor (106 ms)
 [ RUN      ] nljson_serializers_tojson.tuple_accessor
-[       OK ] nljson_serializers_tojson.tuple_accessor (83 ms)
+[       OK ] nljson_serializers_tojson.tuple_accessor (107 ms)
 [ RUN      ] nljson_serializers_tojson.item_accessor
-[       OK ] nljson_serializers_tojson.item_accessor (94 ms)
+[       OK ] nljson_serializers_tojson.item_accessor (107 ms)
 [ RUN      ] nljson_serializers_tojson.str_attr_accessor
-[       OK ] nljson_serializers_tojson.str_attr_accessor (129 ms)
+[       OK ] nljson_serializers_tojson.str_attr_accessor (107 ms)
 [ RUN      ] nljson_serializers_tojson.obj_attr_accessor
-[       OK ] nljson_serializers_tojson.obj_attr_accessor (80 ms)
-[----------] 17 tests from nljson_serializers_tojson (1835 ms total)
+[       OK ] nljson_serializers_tojson.obj_attr_accessor (107 ms)
+[----------] 17 tests from nljson_serializers_tojson (1779 ms total)
 
 [----------] 9 tests from nljson_serializers_fromjson
 [ RUN      ] nljson_serializers_fromjson.none
-[       OK ] nljson_serializers_fromjson.none (74 ms)
+[       OK ] nljson_serializers_fromjson.none (107 ms)
 [ RUN      ] nljson_serializers_fromjson.bool_
-[       OK ] nljson_serializers_fromjson.bool_ (75 ms)
+[       OK ] nljson_serializers_fromjson.bool_ (107 ms)
 [ RUN      ] nljson_serializers_fromjson.integer
-[       OK ] nljson_serializers_fromjson.integer (78 ms)
+[       OK ] nljson_serializers_fromjson.integer (107 ms)
 [ RUN      ] nljson_serializers_fromjson.integer_large_unsigned
-[       OK ] nljson_serializers_fromjson.integer_large_unsigned (81 ms)
+[       OK ] nljson_serializers_fromjson.integer_large_unsigned (111 ms)
 [ RUN      ] nljson_serializers_fromjson.float_
-[       OK ] nljson_serializers_fromjson.float_ (115 ms)
+[       OK ] nljson_serializers_fromjson.float_ (107 ms)
 [ RUN      ] nljson_serializers_fromjson.string
-[       OK ] nljson_serializers_fromjson.string (117 ms)
+[       OK ] nljson_serializers_fromjson.string (108 ms)
 [ RUN      ] nljson_serializers_fromjson.list
-[       OK ] nljson_serializers_fromjson.list (152 ms)
+[       OK ] nljson_serializers_fromjson.list (107 ms)
 [ RUN      ] nljson_serializers_fromjson.dict
-[       OK ] nljson_serializers_fromjson.dict (113 ms)
+[       OK ] nljson_serializers_fromjson.dict (106 ms)
 [ RUN      ] nljson_serializers_fromjson.nested
-[       OK ] nljson_serializers_fromjson.nested (36 ms)
-[----------] 9 tests from nljson_serializers_fromjson (870 ms total)
+[       OK ] nljson_serializers_fromjson.nested (108 ms)
+[----------] 9 tests from nljson_serializers_fromjson (974 ms total)
 
 [----------] 1 test from pybind11_caster_tojson
 [ RUN      ] pybind11_caster_tojson.dict
-[       OK ] pybind11_caster_tojson.dict (147 ms)
-[----------] 1 test from pybind11_caster_tojson (165 ms total)
+[       OK ] pybind11_caster_tojson.dict (108 ms)
+[----------] 1 test from pybind11_caster_tojson (108 ms total)
 
 [----------] 1 test from pybind11_caster_fromjson
 [ RUN      ] pybind11_caster_fromjson.dict
-[       OK ] pybind11_caster_fromjson.dict (130 ms)
-[----------] 1 test from pybind11_caster_fromjson (130 ms total)
+[       OK ] pybind11_caster_fromjson.dict (108 ms)
+[----------] 1 test from pybind11_caster_fromjson (108 ms total)
 
 [----------] Global test environment tear-down
-[==========] 28 tests from 4 test suites ran. (3002 ms total)
+[==========] 28 tests from 4 test suites ran. (2971 ms total)
 [  PASSED  ] 28 tests.
 make[1]: Leaving directory '/build/reproducible-path/pybind11-json-0.2.13'
    create-stamp debian/debhelper-build-stamp
    dh_prep
    dh_auto_install --destdir=debian/pybind11-json-dev/
-	cd obj-arm-linux-gnueabihf && make -j3 install DESTDIR=/build/reproducible-path/pybind11-json-0.2.13/debian/pybind11-json-dev AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true"
+	cd obj-arm-linux-gnueabihf && make -j6 install DESTDIR=/build/reproducible-path/pybind11-json-0.2.13/debian/pybind11-json-dev AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true"
 make[1]: Entering directory '/build/reproducible-path/pybind11-json-0.2.13/obj-arm-linux-gnueabihf'
 /usr/bin/cmake -S/build/reproducible-path/pybind11-json-0.2.13 -B/build/reproducible-path/pybind11-json-0.2.13/obj-arm-linux-gnueabihf --check-build-system CMakeFiles/Makefile.cmake 0
 make  -f CMakeFiles/Makefile2 preinstall
@@ -897,12 +933,14 @@
 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/7951/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/7951/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/8313 and its subdirectories
-I: Current time: Fri Jan 10 00:10:27 -12 2025
-I: pbuilder-time-stamp: 1736511027
+I: removing directory /srv/workspace/pbuilder/7951 and its subdirectories
+I: Current time: Sat Jan 11 02:18:27 +14 2025
+I: pbuilder-time-stamp: 1736511507