Diff of the two buildlogs:

--
--- b1/build.log	2025-01-21 01:13:52.525663308 +0000
+++ b2/build.log	2025-01-21 01:20:09.472739908 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Jan 20 12:54:38 -12 2025
-I: pbuilder-time-stamp: 1737420878
+I: Current time: Tue Jan 21 15:14:02 +14 2025
+I: pbuilder-time-stamp: 1737422042
 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: applying disable-Werror.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/26922/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/10256/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64a.
+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 21 01:14 /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/10256/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/10256/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]="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=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='7a7cd22bab274912af1dbed514d77ec8'
-  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='26922'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=160ee774296d44d29d1994582c914e2f
+  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=10256
   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.odUxg55T/pbuilderrc_H2XK --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.odUxg55T/b1 --logfile b1/build.log gzip_1.13-1.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.odUxg55T/pbuilderrc_FAhB --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.odUxg55T/b2 --logfile b2/build.log gzip_1.13-1.dsc'
+  SUDO_GID=114
+  SUDO_UID=108
+  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 wbq0 6.1.0-30-armmp #1 SMP Debian 6.1.124-1 (2025-01-12) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-30-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) 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/26922/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/10256/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -153,7 +185,7 @@
 Get: 40 http://deb.debian.org/debian trixie/main armhf tex-common all 6.18 [32.5 kB]
 Get: 41 http://deb.debian.org/debian trixie/main armhf texinfo-lib armhf 7.1.1-1+b1 [209 kB]
 Get: 42 http://deb.debian.org/debian trixie/main armhf texinfo all 7.1.1-1 [1753 kB]
-Fetched 23.2 MB in 3s (7330 kB/s)
+Fetched 23.2 MB in 0s (56.8 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package less.
 (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 ... 19569 files and directories currently installed.)
@@ -345,7 +377,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/gzip-1.13/ && 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  > ../gzip_1.13-1_source.changes
+I: user script /srv/workspace/pbuilder/10256/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/10256/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/gzip-1.13/ && 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  > ../gzip_1.13-1_source.changes
 dpkg-buildpackage: info: source package gzip
 dpkg-buildpackage: info: source version 1.13-1
 dpkg-buildpackage: info: source distribution sid
@@ -486,8 +522,8 @@
 checking for sys/sdt.h... no
 checking whether it is safe to define __EXTENSIONS__... yes
 checking whether _XOPEN_SOURCE should be defined... no
-checking build system type... armv7l-unknown-linux-gnueabihf
-checking host system type... armv7l-unknown-linux-gnueabihf
+checking build system type... aarch64-unknown-linux-gnu
+checking host system type... aarch64-unknown-linux-gnu
 checking for egrep -e... /usr/bin/grep -E
 checking for Minix Amsterdam compiler... no
 checking for ar... ar
@@ -2582,8 +2618,10 @@
 make[5]: Entering directory '/build/reproducible-path/gzip-1.13/builddir'
 + cd /build/reproducible-path/gzip-1.13/debian/gzip/usr/bin
 + rm -f uncompress
++ case remove-installed-links in
 + cd /build/reproducible-path/gzip-1.13/debian/gzip/usr/bin
 + rm -f uncompress
++ case install-exec-hook in
 + ln gunzip uncompress
 make[5]: Leaving directory '/build/reproducible-path/gzip-1.13/builddir'
  /usr/bin/mkdir -p '/build/reproducible-path/gzip-1.13/debian/gzip/usr/share/man/man1'
@@ -2632,26 +2670,28 @@
 	install -p -m0644 zmore.1 debian/gzip/usr/share/man/man1/zmore.1
 	install -m0755 -d debian/gzip/usr/share/man/man1/
 	install -p -m0644 znew.1 debian/gzip/usr/share/man/man1/znew.1
+	rm -f debian/gzip/usr/share/man/man1/gunzip.1
+	ln -s gzip.1 debian/gzip/usr/share/man/man1/gunzip.1
 	rm -f debian/gzip/usr/share/man/man1/zcmp.1
 	ln -s zdiff.1 debian/gzip/usr/share/man/man1/zcmp.1
 	rm -f debian/gzip/usr/share/man/man1/zcat.1
 	ln -s gzip.1 debian/gzip/usr/share/man/man1/zcat.1
-	rm -f debian/gzip/usr/share/man/man1/gunzip.1
-	ln -s gzip.1 debian/gzip/usr/share/man/man1/gunzip.1
-	man-recode --to-code UTF-8 --suffix .dh-new debian/gzip/usr/share/man/man1/zforce.1 debian/gzip/usr/share/man/man1/zgrep.1 debian/gzip/usr/share/man/man1/zless.1
+	man-recode --to-code UTF-8 --suffix .dh-new debian/gzip/usr/share/man/man1/zgrep.1 debian/gzip/usr/share/man/man1/zless.1
+	man-recode --to-code UTF-8 --suffix .dh-new debian/gzip/usr/share/man/man1/zdiff.1 debian/gzip/usr/share/man/man1/zforce.1
+	man-recode --to-code UTF-8 --suffix .dh-new debian/gzip/usr/share/man/man1/gzexe.1 debian/gzip/usr/share/man/man1/gzip.1
 	man-recode --to-code UTF-8 --suffix .dh-new debian/gzip/usr/share/man/man1/zmore.1 debian/gzip/usr/share/man/man1/znew.1
-	man-recode --to-code UTF-8 --suffix .dh-new debian/gzip/usr/share/man/man1/gzexe.1 debian/gzip/usr/share/man/man1/gzip.1 debian/gzip/usr/share/man/man1/zdiff.1
+	mv debian/gzip/usr/share/man/man1/gzexe.1.dh-new debian/gzip/usr/share/man/man1/gzexe.1
+	mv debian/gzip/usr/share/man/man1/gzip.1.dh-new debian/gzip/usr/share/man/man1/gzip.1
+	chmod 0644 -- debian/gzip/usr/share/man/man1/gzexe.1 debian/gzip/usr/share/man/man1/gzip.1
+	mv debian/gzip/usr/share/man/man1/zdiff.1.dh-new debian/gzip/usr/share/man/man1/zdiff.1
+	mv debian/gzip/usr/share/man/man1/zforce.1.dh-new debian/gzip/usr/share/man/man1/zforce.1
+	chmod 0644 -- debian/gzip/usr/share/man/man1/zdiff.1 debian/gzip/usr/share/man/man1/zforce.1
 	mv debian/gzip/usr/share/man/man1/zmore.1.dh-new debian/gzip/usr/share/man/man1/zmore.1
 	mv debian/gzip/usr/share/man/man1/znew.1.dh-new debian/gzip/usr/share/man/man1/znew.1
 	chmod 0644 -- debian/gzip/usr/share/man/man1/zmore.1 debian/gzip/usr/share/man/man1/znew.1
-	mv debian/gzip/usr/share/man/man1/zforce.1.dh-new debian/gzip/usr/share/man/man1/zforce.1
 	mv debian/gzip/usr/share/man/man1/zgrep.1.dh-new debian/gzip/usr/share/man/man1/zgrep.1
 	mv debian/gzip/usr/share/man/man1/zless.1.dh-new debian/gzip/usr/share/man/man1/zless.1
-	chmod 0644 -- debian/gzip/usr/share/man/man1/zforce.1 debian/gzip/usr/share/man/man1/zgrep.1 debian/gzip/usr/share/man/man1/zless.1
-	mv debian/gzip/usr/share/man/man1/gzexe.1.dh-new debian/gzip/usr/share/man/man1/gzexe.1
-	mv debian/gzip/usr/share/man/man1/gzip.1.dh-new debian/gzip/usr/share/man/man1/gzip.1
-	mv debian/gzip/usr/share/man/man1/zdiff.1.dh-new debian/gzip/usr/share/man/man1/zdiff.1
-	chmod 0644 -- debian/gzip/usr/share/man/man1/gzexe.1 debian/gzip/usr/share/man/man1/gzip.1 debian/gzip/usr/share/man/man1/zdiff.1
+	chmod 0644 -- debian/gzip/usr/share/man/man1/zgrep.1 debian/gzip/usr/share/man/man1/zless.1
 dh_installinfo -a doc/gzip.info
 	install -m0755 -d debian/gzip/usr/share/info
 	cp --reflink=auto doc/gzip.info debian/gzip/usr/share/info
@@ -2661,12 +2701,12 @@
 	install -p -m0644 debian/.debhelper/generated/gzip/dh_installchangelogs.dch.trimmed debian/gzip/usr/share/doc/gzip/changelog.Debian
 	install -p -m0644 ChangeLog debian/gzip/usr/share/doc/gzip/changelog
 dh_link -a
-	rm -f debian/gzip/usr/share/man/man1/gunzip.1
-	ln -s gzip.1 debian/gzip/usr/share/man/man1/gunzip.1
 	rm -f debian/gzip/usr/share/man/man1/zcat.1
 	ln -s gzip.1 debian/gzip/usr/share/man/man1/zcat.1
 	rm -f debian/gzip/usr/share/man/man1/zcmp.1
 	ln -s zdiff.1 debian/gzip/usr/share/man/man1/zcmp.1
+	rm -f debian/gzip/usr/share/man/man1/gunzip.1
+	ln -s gzip.1 debian/gzip/usr/share/man/man1/gunzip.1
 	install -m0755 -d debian/gzip/usr/share/man/man1
 	rm -f debian/gzip/usr/share/man/man1/zfgrep.1.gz
 	ln -s zgrep.1.gz debian/gzip/usr/share/man/man1/zfgrep.1.gz
@@ -2694,12 +2734,12 @@
 	chmod a-x usr/share/doc/gzip/NEWS usr/share/doc/gzip/README usr/share/doc/gzip/changelog usr/share/doc/gzip/changelog.Debian usr/share/info/gzip.info usr/share/man/man1/gzexe.1 usr/share/man/man1/gzip.1 usr/share/man/man1/zdiff.1 usr/share/man/man1/zforce.1 usr/share/man/man1/zgrep.1 usr/share/man/man1/zless.1 usr/share/man/man1/zmore.1 usr/share/man/man1/znew.1
 	gzip -9nf usr/share/doc/gzip/NEWS usr/share/doc/gzip/README usr/share/doc/gzip/changelog usr/share/doc/gzip/changelog.Debian usr/share/info/gzip.info usr/share/man/man1/gzexe.1 usr/share/man/man1/gzip.1 usr/share/man/man1/zdiff.1 usr/share/man/man1/zforce.1 usr/share/man/man1/zgrep.1 usr/share/man/man1/zless.1 usr/share/man/man1/zmore.1 usr/share/man/man1/znew.1
 	cd '/build/reproducible-path/gzip-1.13'
+	rm -f debian/gzip/usr/share/man/man1/gunzip.1 debian/gzip/usr/share/man/man1/gunzip.1.gz
+	ln -s gzip.1.gz debian/gzip/usr/share/man/man1/gunzip.1.gz
 	rm -f debian/gzip/usr/share/man/man1/zcat.1 debian/gzip/usr/share/man/man1/zcat.1.gz
 	ln -s gzip.1.gz debian/gzip/usr/share/man/man1/zcat.1.gz
 	rm -f debian/gzip/usr/share/man/man1/zcmp.1 debian/gzip/usr/share/man/man1/zcmp.1.gz
 	ln -s zdiff.1.gz debian/gzip/usr/share/man/man1/zcmp.1.gz
-	rm -f debian/gzip/usr/share/man/man1/gunzip.1 debian/gzip/usr/share/man/man1/gunzip.1.gz
-	ln -s gzip.1.gz debian/gzip/usr/share/man/man1/gunzip.1.gz
 rm -f '/build/reproducible-path/gzip-1.13'/debian/gzip/usr/share/info/dir.gz
 dh_fixperms -a
 	find debian/gzip ! -type l -a -true -a -true -print0 2>/dev/null | xargs -0r chmod go=rX,u+rw,a-s
@@ -2744,8 +2784,8 @@
 dh_builddeb -a
 	dpkg-deb --root-owner-group --build debian/gzip ..
 	dpkg-deb --root-owner-group --build debian/.debhelper/gzip/dbgsym-root ..
-dpkg-deb: building package 'gzip-dbgsym' in '../gzip-dbgsym_1.13-1_armhf.deb'.
 dpkg-deb: building package 'gzip' in '../gzip_1.13-1_armhf.deb'.
+dpkg-deb: building package 'gzip-dbgsym' in '../gzip-dbgsym_1.13-1_armhf.deb'.
  dpkg-genbuildinfo --build=binary -O../gzip_1.13-1_armhf.buildinfo
  dpkg-genchanges --build=binary -O../gzip_1.13-1_armhf.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -2753,12 +2793,14 @@
 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/10256/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/10256/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/26922 and its subdirectories
-I: Current time: Mon Jan 20 13:13:47 -12 2025
-I: pbuilder-time-stamp: 1737422027
+I: removing directory /srv/workspace/pbuilder/10256 and its subdirectories
+I: Current time: Tue Jan 21 15:20:04 +14 2025
+I: pbuilder-time-stamp: 1737422404