Diff of the two buildlogs:

--
--- b1/build.log	2025-02-27 05:16:17.133822915 +0000
+++ b2/build.log	2025-02-27 05:17:16.443139271 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Feb 26 17:15:42 -12 2025
-I: pbuilder-time-stamp: 1740633342
+I: Current time: Thu Apr  2 01:39:20 +14 2026
+I: pbuilder-time-stamp: 1775043560
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking libimage-png-libpng-perl_0.59-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3230110/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2885949/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink03-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 Apr  1 11:39 /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/2885949/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2885949/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]="37" [3]="1" [4]="release" [5]="aarch64-unknown-linux-gnu")
+  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=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='fb83af9f46684ec1b6776e6d1c6b2da0'
-  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='3230110'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=c7b02ccb578b4beb8237ae066460b19f
+  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=2885949
   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.dfv5JnPg/pbuilderrc_NQgk --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.dfv5JnPg/b1 --logfile b1/build.log libimage-png-libpng-perl_0.59-1.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.dfv5JnPg/pbuilderrc_usGs --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.dfv5JnPg/b2 --logfile b2/build.log libimage-png-libpng-perl_0.59-1.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 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) 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/3230110/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2885949/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -144,7 +176,7 @@
 Get: 32 http://deb.debian.org/debian trixie/main arm64 libpng16-16t64 arm64 1.6.46-4 [276 kB]
 Get: 33 http://deb.debian.org/debian trixie/main arm64 zlib1g-dev arm64 1:1.3.dfsg+really1.3.1-1+b1 [917 kB]
 Get: 34 http://deb.debian.org/debian trixie/main arm64 libpng-dev arm64 1.6.46-4 [364 kB]
-Fetched 22.7 MB in 0s (151 MB/s)
+Fetched 22.7 MB in 0s (84.5 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package sensible-utils.
 (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 ... 19915 files and directories currently installed.)
@@ -295,7 +327,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/libimage-png-libpng-perl-0.59/ && 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  > ../libimage-png-libpng-perl_0.59-1_source.changes
+I: user script /srv/workspace/pbuilder/2885949/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/2885949/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/libimage-png-libpng-perl-0.59/ && 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  > ../libimage-png-libpng-perl_0.59-1_source.changes
 dpkg-buildpackage: info: source package libimage-png-libpng-perl
 dpkg-buildpackage: info: source version 0.59-1
 dpkg-buildpackage: info: source distribution unstable
@@ -322,14 +358,14 @@
    dh_auto_build
 	make -j12
 make[1]: Entering directory '/build/reproducible-path/libimage-png-libpng-perl-0.59'
-Running Mkbootstrap for Libpng ()
-"/usr/bin/perl" "/usr/share/perl/5.40/ExtUtils/xsubpp"  -typemap '/usr/share/perl/5.40/ExtUtils/typemap' -typemap '/build/reproducible-path/libimage-png-libpng-perl-0.59/typemap'  Libpng.xs > Libpng.xsc
-chmod 644 "Libpng.bs"
 cp lib/Image/PNG/Libpng.pm blib/lib/Image/PNG/Libpng.pm
-cp nicemake.pl blib/lib/Image/PNG/nicemake.pl
-cp get-pixel.pl blib/lib/Image/PNG/get-pixel.pl
 cp lib/Image/PNG/Const.pm blib/lib/Image/PNG/Const.pm
+cp get-pixel.pl blib/lib/Image/PNG/get-pixel.pl
+cp nicemake.pl blib/lib/Image/PNG/nicemake.pl
 cp lib/Image/PNG/Libpng.pod blib/lib/Image/PNG/Libpng.pod
+Running Mkbootstrap for Libpng ()
+"/usr/bin/perl" "/usr/share/perl/5.40/ExtUtils/xsubpp"  -typemap '/usr/share/perl/5.40/ExtUtils/typemap' -typemap '/build/reproducible-path/libimage-png-libpng-perl-0.59/typemap'  Libpng.xs > Libpng.xsc
+chmod 644 "Libpng.bs"
 "/usr/bin/perl" -MExtUtils::Command::MM -e 'cp_nonempty' -- Libpng.bs blib/arch/auto/Image/PNG/Libpng/Libpng.bs 644
 mv Libpng.xsc Libpng.c
 aarch64-linux-gnu-gcc -c   -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libimage-png-libpng-perl-0.59=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wdate-time -D_FORTIFY_SOURCE=2   -DVERSION=\"0.59\" -DXS_VERSION=\"0.59\" -fPIC "-I/usr/lib/aarch64-linux-gnu/perl/5.40/CORE"   Libpng.c
@@ -351,10 +387,10 @@
 t/bKGD.t .............. 
 ok 1 - get background got OK
 ok 2 - green background
-ok 3 - gray background
+ok 3 - index background
 ok 4 - blue background
-ok 5 - index background
-ok 6 - red background
+ok 5 - red background
+ok 6 - gray background
 ok 7 - Valid IDAT
 ok 8 - Valid bKGD
 ok 9 - Valid gAMA
@@ -366,15 +402,15 @@
 t/bogus.t ............. skipped: libpng version is 1.6.46
 t/chrm-xyz.t .......... 
 ok 1 - got a cHRM chunk
-ok 2 - round trip of blue_y (0.33326, 0.333333333333333) of cHRM_XYZ
+ok 2 - round trip of blue_z (0.97296, 0.973139769254836) of cHRM_XYZ
 ok 3 - round trip of red_y (0.33335, 0.333333333333333) of cHRM_XYZ
-ok 4 - round trip of green_y (0.33338, 0.333333333333333) of cHRM_XYZ
+ok 4 - round trip of red_x (0.80984, 0.809770379521982) of cHRM_XYZ
 ok 5 - round trip of red_z (0.47944, 0.479404662360565) of cHRM_XYZ
-ok 6 - round trip of red_x (0.80984, 0.809770379521982) of cHRM_XYZ
-ok 7 - round trip of green_z (0.85646, 0.85632538956996) of cHRM_XYZ
-ok 8 - round trip of green_x (0.57231, 0.57222996059598) of cHRM_XYZ
-ok 9 - round trip of blue_z (0.97296, 0.973139769254836) of cHRM_XYZ
-ok 10 - round trip of blue_x (0.78333, 0.783478577193943) of cHRM_XYZ
+ok 6 - round trip of blue_y (0.33326, 0.333333333333333) of cHRM_XYZ
+ok 7 - round trip of green_y (0.33338, 0.333333333333333) of cHRM_XYZ
+ok 8 - round trip of green_z (0.85646, 0.85632538956996) of cHRM_XYZ
+ok 9 - round trip of blue_x (0.78333, 0.783478577193943) of cHRM_XYZ
+ok 10 - round trip of green_x (0.57231, 0.57222996059598) of cHRM_XYZ
 1..10
 ok
 t/cHRM.t .............. 
@@ -975,10 +1011,10 @@
 t/io-read.t ........... 
 $VAR1 = {
           'height' => 100,
-          'color_type' => 2,
           'interlace_method' => 0,
-          'bit_depth' => 8,
-          'width' => 100
+          'color_type' => 2,
+          'width' => 100,
+          'bit_depth' => 8
         };
 ok 1 - height & rows same
 ok 2 - Got correct image width
@@ -1045,49 +1081,49 @@
 1..1
 ok
 t/set-itxt.t .......... 
-ok 1 - Got key lang back for text chunk 0
-ok 2 - Value for lang is the same for text chunk 0
-ok 3 - Got key key back for text chunk 0
-ok 4 - Value for key is the same for text chunk 0
-ok 5 - Got key compression back for text chunk 0
-ok 6 - Value for compression is the same for text chunk 0
-ok 7 - Got key lang_key back for text chunk 0
-ok 8 - Value for lang_key is the same for text chunk 0
-ok 9 - Got key text back for text chunk 0
-ok 10 - Value for text is the same for text chunk 0
-ok 11 - Got key text back for text chunk 1
-ok 12 - Value for text is the same for text chunk 1
-ok 13 - Got key compression back for text chunk 1
-ok 14 - Value for compression is the same for text chunk 1
-ok 15 - Got key lang_key back for text chunk 1
-ok 16 - Value for lang_key is the same for text chunk 1
-ok 17 - Got key lang back for text chunk 1
-ok 18 - Value for lang is the same for text chunk 1
+ok 1 - Got key lang_key back for text chunk 0
+ok 2 - Value for lang_key is the same for text chunk 0
+ok 3 - Got key text back for text chunk 0
+ok 4 - Value for text is the same for text chunk 0
+ok 5 - Got key lang back for text chunk 0
+ok 6 - Value for lang is the same for text chunk 0
+ok 7 - Got key compression back for text chunk 0
+ok 8 - Value for compression is the same for text chunk 0
+ok 9 - Got key key back for text chunk 0
+ok 10 - Value for key is the same for text chunk 0
+ok 11 - Got key compression back for text chunk 1
+ok 12 - Value for compression is the same for text chunk 1
+ok 13 - Got key lang back for text chunk 1
+ok 14 - Value for lang is the same for text chunk 1
+ok 15 - Got key text back for text chunk 1
+ok 16 - Value for text is the same for text chunk 1
+ok 17 - Got key lang_key back for text chunk 1
+ok 18 - Value for lang_key is the same for text chunk 1
 ok 19 - Got key key back for text chunk 1
 ok 20 - Value for key is the same for text chunk 1
 ok 21 - Got key key back for text chunk 0
 ok 22 - Value for key is the same for text chunk 0
-ok 23 - Got key lang back for text chunk 0
-ok 24 - Value for lang is the same for text chunk 0
-ok 25 - Got key lang_key back for text chunk 0
-ok 26 - Value for lang_key is the same for text chunk 0
-ok 27 - Got key compression back for text chunk 0
-ok 28 - Value for compression is the same for text chunk 0
-ok 29 - Got key text back for text chunk 0
-ok 30 - Value for text is the same for text chunk 0
+ok 23 - Got key lang_key back for text chunk 0
+ok 24 - Value for lang_key is the same for text chunk 0
+ok 25 - Got key text back for text chunk 0
+ok 26 - Value for text is the same for text chunk 0
+ok 27 - Got key lang back for text chunk 0
+ok 28 - Value for lang is the same for text chunk 0
+ok 29 - Got key compression back for text chunk 0
+ok 30 - Value for compression is the same for text chunk 0
 1..30
 ok
 t/set-text.t .......... 
-ok 1 - Got key text back for text chunk 0
-ok 2 - Value for text is the same for text chunk 0
-ok 3 - Got key key back for text chunk 0
-ok 4 - Value for key is the same for text chunk 0
+ok 1 - Got key key back for text chunk 0
+ok 2 - Value for key is the same for text chunk 0
+ok 3 - Got key text back for text chunk 0
+ok 4 - Value for text is the same for text chunk 0
 ok 5 - Got key key back for text chunk 1
 ok 6 - Value for key is the same for text chunk 1
-ok 7 - Got key compression back for text chunk 1
-ok 8 - Value for compression is the same for text chunk 1
-ok 9 - Got key text back for text chunk 1
-ok 10 - Value for text is the same for text chunk 1
+ok 7 - Got key text back for text chunk 1
+ok 8 - Value for text is the same for text chunk 1
+ok 9 - Got key compression back for text chunk 1
+ok 10 - Value for compression is the same for text chunk 1
 ok 11 - Got key key back for text chunk 2
 ok 12 - Value for key is the same for text chunk 2
 ok 13 - Got error adding text chunk without 'key'
@@ -1444,7 +1480,7 @@
 1..2
 ok
 All tests successful.
-Files=38, Tests=395,  4 wallclock secs ( 0.20 usr  0.11 sys +  3.38 cusr  0.68 csys =  4.37 CPU)
+Files=38, Tests=395,  4 wallclock secs ( 0.11 usr  0.05 sys +  2.30 cusr  0.47 csys =  2.93 CPU)
 Result: PASS
 make[1]: Leaving directory '/build/reproducible-path/libimage-png-libpng-perl-0.59'
    create-stamp debian/debhelper-build-stamp
@@ -1460,9 +1496,9 @@
 Files found in blib/arch: installing files in blib/lib into architecture dependent library tree
 Installing /build/reproducible-path/libimage-png-libpng-perl-0.59/debian/libimage-png-libpng-perl/usr/lib/aarch64-linux-gnu/perl5/5.40/auto/Image/PNG/Libpng/Libpng.so
 Installing /build/reproducible-path/libimage-png-libpng-perl-0.59/debian/libimage-png-libpng-perl/usr/lib/aarch64-linux-gnu/perl5/5.40/Image/PNG/Libpng.pod
-Installing /build/reproducible-path/libimage-png-libpng-perl-0.59/debian/libimage-png-libpng-perl/usr/lib/aarch64-linux-gnu/perl5/5.40/Image/PNG/Const.pm
-Installing /build/reproducible-path/libimage-png-libpng-perl-0.59/debian/libimage-png-libpng-perl/usr/lib/aarch64-linux-gnu/perl5/5.40/Image/PNG/get-pixel.pl
 Installing /build/reproducible-path/libimage-png-libpng-perl-0.59/debian/libimage-png-libpng-perl/usr/lib/aarch64-linux-gnu/perl5/5.40/Image/PNG/nicemake.pl
+Installing /build/reproducible-path/libimage-png-libpng-perl-0.59/debian/libimage-png-libpng-perl/usr/lib/aarch64-linux-gnu/perl5/5.40/Image/PNG/get-pixel.pl
+Installing /build/reproducible-path/libimage-png-libpng-perl-0.59/debian/libimage-png-libpng-perl/usr/lib/aarch64-linux-gnu/perl5/5.40/Image/PNG/Const.pm
 Installing /build/reproducible-path/libimage-png-libpng-perl-0.59/debian/libimage-png-libpng-perl/usr/lib/aarch64-linux-gnu/perl5/5.40/Image/PNG/Libpng.pm
 Installing /build/reproducible-path/libimage-png-libpng-perl-0.59/debian/libimage-png-libpng-perl/usr/share/man/man1/pnginspect.1p
 Installing /build/reproducible-path/libimage-png-libpng-perl-0.59/debian/libimage-png-libpng-perl/usr/share/man/man3/Image::PNG::Libpng.3pm
@@ -1507,12 +1543,14 @@
 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/2885949/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2885949/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/3230110 and its subdirectories
-I: Current time: Wed Feb 26 17:16:16 -12 2025
-I: pbuilder-time-stamp: 1740633376
+I: removing directory /srv/workspace/pbuilder/2885949 and its subdirectories
+I: Current time: Thu Apr  2 01:40:15 +14 2026
+I: pbuilder-time-stamp: 1775043615