Diff of the two buildlogs:

--
--- b1/build.log	2024-05-09 23:43:40.481895674 +0000
+++ b2/build.log	2024-05-09 23:44:22.980084274 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu May  9 11:42:40 -12 2024
-I: pbuilder-time-stamp: 1715298160
+I: Current time: Thu Jun 12 20:06:43 +14 2025
+I: pbuilder-time-stamp: 1749708403
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -26,52 +26,84 @@
 dpkg-source: info: unpacking yojson_2.1.2-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1274381/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2198350/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink01-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 Jun 12 06:06 /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/2198350/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2198350/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]="21" [3]="1" [4]="release" [5]="aarch64-unknown-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=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='5116e1e4550645d38ab5491dae3223c5'
-  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='1274381'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=7c006eddcc654418bb2eed937ca1a3ef
+  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=2198350
   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.s58e8iDB/pbuilderrc_YvVk --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.s58e8iDB/b1 --logfile b1/build.log yojson_2.1.2-1.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.s58e8iDB/pbuilderrc_VOZY --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.s58e8iDB/b2 --logfile b2/build.log yojson_2.1.2-1.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 codethink04-arm64 6.1.0-21-cloud-arm64 #1 SMP Debian 6.1.90-1 (2024-05-03) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-21-cloud-arm64 #1 SMP Debian 6.1.90-1 (2024-05-03) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May  8 11:23 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1274381/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Jun 10 17:47 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2198350/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -185,7 +217,7 @@
 Get: 56 http://deb.debian.org/debian trixie/main arm64 libfindlib-ocaml arm64 1.9.6-1+b2 [173 kB]
 Get: 57 http://deb.debian.org/debian trixie/main arm64 ocaml-dune arm64 3.14.0-1 [5205 kB]
 Get: 58 http://deb.debian.org/debian trixie/main arm64 ocaml-findlib arm64 1.9.6-1+b2 [563 kB]
-Fetched 149 MB in 1s (157 MB/s)
+Fetched 149 MB in 1s (208 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sensible-utils.
 (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
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(Reading database ... 45%
(Reading database ... 50%
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(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 ... 19744 files and directories currently installed.)
@@ -432,7 +464,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/yojson-2.1.2/ && 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  > ../yojson_2.1.2-1_source.changes
+I: user script /srv/workspace/pbuilder/2198350/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/2198350/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/yojson-2.1.2/ && 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  > ../yojson_2.1.2-1_source.changes
 dpkg-buildpackage: info: source package yojson
 dpkg-buildpackage: info: source version 2.1.2-1
 dpkg-buildpackage: info: source distribution unstable
@@ -458,7 +494,7 @@
 	dune runtest -j 12 -p yojson
 (cd _build/default/test && ./test.exe)
 Testing `Yojson'.
-This run has ID `18802KQ7'.
+This run has ID `LP74NO9V'.
 
   [OK]          equality          0   Scalar equality.
   [OK]          equality          1   List equality.
@@ -482,7 +518,7 @@
   [OK]          util              2   traversal.
 
 Full test results in `/build/reproducible-path/yojson-2.1.2/_build/default/test/_build/_tests/Yojson'.
-Test Successful in 0.001s. 20 tests run.
+Test Successful in 0.003s. 20 tests run.
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=ocaml_dune
    dh_prep -O--buildsystem=ocaml_dune
@@ -511,10 +547,10 @@
 dpkg-gencontrol: warning: Depends field of package libyojson-ocaml: substitution variable ${shlibs:Depends} used, but is not defined
    dh_md5sums -O--buildsystem=ocaml_dune
    dh_builddeb -O--buildsystem=ocaml_dune
-dpkg-deb: building package 'libyojson-ocaml-dev-dbgsym' in '../libyojson-ocaml-dev-dbgsym_2.1.2-1_arm64.deb'.
 dpkg-deb: building package 'libyojson-ocaml-dev' in '../libyojson-ocaml-dev_2.1.2-1_arm64.deb'.
-dpkg-deb: building package 'libyojson-ocaml-dbgsym' in '../libyojson-ocaml-dbgsym_2.1.2-1_arm64.deb'.
+dpkg-deb: building package 'libyojson-ocaml-dev-dbgsym' in '../libyojson-ocaml-dev-dbgsym_2.1.2-1_arm64.deb'.
 dpkg-deb: building package 'libyojson-ocaml' in '../libyojson-ocaml_2.1.2-1_arm64.deb'.
+dpkg-deb: building package 'libyojson-ocaml-dbgsym' in '../libyojson-ocaml-dbgsym_2.1.2-1_arm64.deb'.
  dpkg-genbuildinfo --build=binary -O../yojson_2.1.2-1_arm64.buildinfo
  dpkg-genchanges --build=binary -O../yojson_2.1.2-1_arm64.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -522,12 +558,14 @@
 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/2198350/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2198350/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/1274381 and its subdirectories
-I: Current time: Thu May  9 11:43:39 -12 2024
-I: pbuilder-time-stamp: 1715298219
+I: removing directory /srv/workspace/pbuilder/2198350 and its subdirectories
+I: Current time: Thu Jun 12 20:07:21 +14 2025
+I: pbuilder-time-stamp: 1749708441