Diff of the two buildlogs:

--
--- b1/build.log	2024-06-26 20:31:26.475953685 +0000
+++ b2/build.log	2024-06-26 20:37:52.171495388 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Jun 26 08:10:42 -12 2024
-I: pbuilder-time-stamp: 1719432642
+I: Current time: Thu Jun 27 10:31:39 +14 2024
+I: pbuilder-time-stamp: 1719433899
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -33,52 +33,84 @@
 dpkg-source: info: applying 0006-Fix-FTBFS-with-ruby-3.2.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/23626/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/12628/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64z.
+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 26 20:31 /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/12628/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/12628/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='trixie'
-  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]="21" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
+  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=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=4 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='75c47c1ac9804b00915a5ec05380579c'
-  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='23626'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=6094f6fa6d084a43afa88471c625f0fd
+  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=12628
   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.Ekuwmv6B/pbuilderrc_rkdD --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.Ekuwmv6B/b1 --logfile b1/build.log ruby-kyotocabinet_1.34-2.dsc'
-  SUDO_GID='113'
-  SUDO_UID='107'
-  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.Ekuwmv6B/pbuilderrc_DZRJ --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.Ekuwmv6B/b2 --logfile b2/build.log ruby-kyotocabinet_1.34-2.dsc'
+  SUDO_GID=110
+  SUDO_UID=103
+  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 cbxi4a 6.1.0-21-armmp #1 SMP Debian 6.1.90-1 (2024-05-03) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-21-arm64 #1 SMP Debian 6.1.90-1 (2024-05-03) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Jun  5 22:35 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/23626/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/12628/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -250,7 +282,7 @@
 Get: 128 http://deb.debian.org/debian trixie/main armhf libpkgconf3 armhf 1.8.1-3 [31.7 kB]
 Get: 129 http://deb.debian.org/debian trixie/main armhf pkgconf-bin armhf 1.8.1-3 [29.1 kB]
 Get: 130 http://deb.debian.org/debian trixie/main armhf pkgconf armhf 1.8.1-3 [26.1 kB]
-Fetched 42.1 MB in 3s (14.9 MB/s)
+Fetched 42.1 MB in 1s (74.2 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libpython3.11-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 ... 19419 files and directories currently installed.)
@@ -685,8 +717,8 @@
 Setting up tzdata (2024a-4) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Wed Jun 26 20:12:46 UTC 2024.
-Universal Time is now:  Wed Jun 26 20:12:46 UTC 2024.
+Local time is now:      Wed Jun 26 20:32:40 UTC 2024.
+Universal Time is now:  Wed Jun 26 20:32:40 UTC 2024.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -804,7 +836,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/ruby-kyotocabinet-1.34/ && 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  > ../ruby-kyotocabinet_1.34-2_source.changes
+I: user script /srv/workspace/pbuilder/12628/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/12628/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/ruby-kyotocabinet-1.34/ && 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  > ../ruby-kyotocabinet_1.34-2_source.changes
 dpkg-buildpackage: info: source package ruby-kyotocabinet
 dpkg-buildpackage: info: source version 1.34-2
 dpkg-buildpackage: info: source distribution unstable
@@ -853,13 +889,13 @@
 checking for kccommon.h... yes
 creating Makefile
 current directory: /build/reproducible-path/ruby-kyotocabinet-1.34
-["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "DESTDIR=", "sitearchdir=./.gem.20240626-28215-caxqq6", "sitelibdir=./.gem.20240626-28215-caxqq6", "clean"]
+["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "DESTDIR=", "sitearchdir=./.gem.20240627-11439-srlqu0", "sitelibdir=./.gem.20240627-11439-srlqu0", "clean"]
 make[1]: Entering directory '/build/reproducible-path/ruby-kyotocabinet-1.34'
 rm -f 
 rm -fr kyotocabinet.so false *.o  *.bak mkmf.log .*.time
 make[1]: Leaving directory '/build/reproducible-path/ruby-kyotocabinet-1.34'
 current directory: /build/reproducible-path/ruby-kyotocabinet-1.34
-["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "DESTDIR=", "sitearchdir=./.gem.20240626-28215-caxqq6", "sitelibdir=./.gem.20240626-28215-caxqq6"]
+["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "DESTDIR=", "sitearchdir=./.gem.20240627-11439-srlqu0", "sitelibdir=./.gem.20240627-11439-srlqu0"]
 make[1]: Entering directory '/build/reproducible-path/ruby-kyotocabinet-1.34'
 g++ -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=. -I. -I/usr/include/arm-linux-gnueabihf/ruby-3.1.0 -I/usr/include/ruby-3.1.0/ruby/backward -I/usr/include/ruby-3.1.0 -I. -DHAVE_KCCOMMON_H -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2   -fPIC -g -O2 -ffile-prefix-map=BUILDDIR=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security  -o kyotocabinet.o -c kyotocabinet.cc
 kyotocabinet.cc: In function 'VALUE db_transaction(int, VALUE*, VALUE)':
@@ -974,14 +1010,14 @@
 g++ -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=. -shared -o kyotocabinet.so kyotocabinet.o -L. -L/usr/lib/arm-linux-gnueabihf -L. -Wl,-z,relro -Wl,-z,now -fstack-protector-strong -rdynamic -Wl,-export-dynamic -Wl,--no-as-needed -L.  -Wl,-z,relro -Wl,-z,now    -lruby-3.1  -lkyotocabinet  -lm  -lc
 make[1]: Leaving directory '/build/reproducible-path/ruby-kyotocabinet-1.34'
 current directory: /build/reproducible-path/ruby-kyotocabinet-1.34
-["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "DESTDIR=", "sitearchdir=./.gem.20240626-28215-caxqq6", "sitelibdir=./.gem.20240626-28215-caxqq6", "install"]
+["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "DESTDIR=", "sitearchdir=./.gem.20240627-11439-srlqu0", "sitelibdir=./.gem.20240627-11439-srlqu0", "install"]
 make[1]: Entering directory '/build/reproducible-path/ruby-kyotocabinet-1.34'
-/bin/mkdir -p . ./.gem.20240626-28215-caxqq6
+/bin/mkdir -p . ./.gem.20240627-11439-srlqu0
 exit > .sitearchdir.time
-/usr/bin/install -c -m 0755 kyotocabinet.so ./.gem.20240626-28215-caxqq6
+/usr/bin/install -c -m 0755 kyotocabinet.so ./.gem.20240627-11439-srlqu0
 make[1]: Leaving directory '/build/reproducible-path/ruby-kyotocabinet-1.34'
 current directory: /build/reproducible-path/ruby-kyotocabinet-1.34
-["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "DESTDIR=", "sitearchdir=./.gem.20240626-28215-caxqq6", "sitelibdir=./.gem.20240626-28215-caxqq6", "clean"]
+["make", "V=1", "CC=gcc -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "CXX=g++ -fdebug-prefix-map=/build/reproducible-path/ruby-kyotocabinet-1.34=.", "DESTDIR=", "sitearchdir=./.gem.20240627-11439-srlqu0", "sitelibdir=./.gem.20240627-11439-srlqu0", "clean"]
 make[1]: Entering directory '/build/reproducible-path/ruby-kyotocabinet-1.34'
 rm -f 
 rm -fr kyotocabinet.so false *.o  *.bak mkmf.log .*.time
@@ -989,13 +1025,13 @@
 current directory: /build/reproducible-path/ruby-kyotocabinet-1.34
 /usr/bin/ruby3.1 -I/usr/lib/ruby/vendor_ruby extconf.rb
 current directory: /build/reproducible-path/ruby-kyotocabinet-1.34
-make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. DESTDIR\= sitearchdir\=./.gem.20240626-28215-caxqq6 sitelibdir\=./.gem.20240626-28215-caxqq6 clean
+make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. DESTDIR\= sitearchdir\=./.gem.20240627-11439-srlqu0 sitelibdir\=./.gem.20240627-11439-srlqu0 clean
 current directory: /build/reproducible-path/ruby-kyotocabinet-1.34
-make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. DESTDIR\= sitearchdir\=./.gem.20240626-28215-caxqq6 sitelibdir\=./.gem.20240626-28215-caxqq6
+make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. DESTDIR\= sitearchdir\=./.gem.20240627-11439-srlqu0 sitelibdir\=./.gem.20240627-11439-srlqu0
 current directory: /build/reproducible-path/ruby-kyotocabinet-1.34
-make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. DESTDIR\= sitearchdir\=./.gem.20240626-28215-caxqq6 sitelibdir\=./.gem.20240626-28215-caxqq6 install
+make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. DESTDIR\= sitearchdir\=./.gem.20240627-11439-srlqu0 sitelibdir\=./.gem.20240627-11439-srlqu0 install
 current directory: /build/reproducible-path/ruby-kyotocabinet-1.34
-make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. DESTDIR\= sitearchdir\=./.gem.20240626-28215-caxqq6 sitelibdir\=./.gem.20240626-28215-caxqq6 clean
+make V\=1 CC\=gcc\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. CXX\=g++\ -fdebug-prefix-map\=/build/reproducible-path/ruby-kyotocabinet-1.34\=. DESTDIR\= sitearchdir\=./.gem.20240627-11439-srlqu0 sitelibdir\=./.gem.20240627-11439-srlqu0 clean
 rm -f /build/reproducible-path/ruby-kyotocabinet-1.34/debian/ruby-kyotocabinet/usr/lib/arm-linux-gnueabihf/ruby/vendor_ruby/3.1.0/mkmf.log
 
 ┌──────────────────────────────────────────────────────────────────────────────┐
@@ -1146,8 +1182,8 @@
 dpkg-gencontrol: warning: package ruby-kyotocabinet: substitution variable ${ruby:Versions} used, but is not defined
    dh_md5sums -O--buildsystem=ruby
    dh_builddeb -O--buildsystem=ruby
-dpkg-deb: building package 'ruby-kyotocabinet-dbgsym' in '../ruby-kyotocabinet-dbgsym_1.34-2_armhf.deb'.
 dpkg-deb: building package 'ruby-kyotocabinet' in '../ruby-kyotocabinet_1.34-2_armhf.deb'.
+dpkg-deb: building package 'ruby-kyotocabinet-dbgsym' in '../ruby-kyotocabinet-dbgsym_1.34-2_armhf.deb'.
  dpkg-genbuildinfo --build=binary -O../ruby-kyotocabinet_1.34-2_armhf.buildinfo
  dpkg-genchanges --build=binary -O../ruby-kyotocabinet_1.34-2_armhf.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -1155,12 +1191,14 @@
 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/12628/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/12628/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/23626 and its subdirectories
-I: Current time: Wed Jun 26 08:31:21 -12 2024
-I: pbuilder-time-stamp: 1719433881
+I: removing directory /srv/workspace/pbuilder/12628 and its subdirectories
+I: Current time: Thu Jun 27 10:37:45 +14 2024
+I: pbuilder-time-stamp: 1719434265