Diff of the two buildlogs:

--
--- b1/build.log	2023-04-11 16:34:28.022347126 +0000
+++ b2/build.log	2023-04-11 16:37:13.388790023 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon May 13 10:55:54 -12 2024
-I: pbuilder-time-stamp: 1715640954
+I: Current time: Wed Apr 12 06:34:32 +14 2023
+I: pbuilder-time-stamp: 1681230872
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bookworm-reproducible-base.tgz]
 I: copying local configuration
@@ -16,7 +16,7 @@
 I: copying [./golang-github-bsipos-thist_1.0.0.orig.tar.gz]
 I: copying [./golang-github-bsipos-thist_1.0.0-2.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Thu Aug 20 22:40:06 2020 -12
+gpgv: Signature made Sat Aug 22 00:40:06 2020 +14
 gpgv:                using RSA key F1F007320A035541F0A663CA578A0494D1C646D1
 gpgv:                issuer "tille@debian.org"
 gpgv: Can't check signature: No public key
@@ -26,11 +26,20 @@
 dpkg-source: info: unpacking golang-github-bsipos-thist_1.0.0-2.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/8906/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3835/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink10-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
+lrwxrwxrwx 1 root root 4 Jan  6 03:20 /bin/sh -> dash
+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/3835/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3835/tmp/hooks/D02_print_environment starting
 I: set
   BUILDDIR='/build'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
+  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=8'
@@ -40,38 +49,38 @@
   IFS=' 	
   '
   LANG='C'
-  LANGUAGE='en_US:en'
+  LANGUAGE='nl_BE:nl'
   LC_ALL='C'
   MAIL='/var/mail/root'
   OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
+  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'
-  PPID='8906'
+  PPID='3835'
   PS1='# '
   PS2='> '
   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.2guWAVLx/pbuilderrc_PYjb --distribution bookworm --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.2guWAVLx/b1 --logfile b1/build.log golang-github-bsipos-thist_1.0.0-2.dsc'
+  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.2guWAVLx/pbuilderrc_3QFN --distribution bookworm --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.2guWAVLx/b2 --logfile b2/build.log --extrapackages usrmerge golang-github-bsipos-thist_1.0.0-2.dsc'
   SUDO_GID='117'
   SUDO_UID='110'
   SUDO_USER='jenkins'
   TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
+  TZ='/usr/share/zoneinfo/Etc/GMT-14'
   USER='root'
   USERNAME='root'
   _='/usr/bin/systemd-run'
   http_proxy='http://192.168.101.16:3128'
 I: uname -a
-  Linux codethink13-arm64 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 13 04:48 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/8906/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr 12 00:26 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3835/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -163,7 +172,7 @@
 Get: 46 http://deb.debian.org/debian bookworm/main arm64 golang-golang-x-crypto-dev all 1:0.4.0-1 [1449 kB]
 Get: 47 http://deb.debian.org/debian bookworm/main arm64 golang-golang-x-exp-dev all 0.0~git20221028.83b7d23-2 [104 kB]
 Get: 48 http://deb.debian.org/debian bookworm/main arm64 golang-gonum-v1-plot-dev all 0.7.0-5 [4804 kB]
-Fetched 109 MB in 3s (33.9 MB/s)
+Fetched 109 MB in 2s (54.4 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%
(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 ... 19616 files and directories currently installed.)
@@ -369,8 +378,17 @@
 Writing extended state information...
 Building tag database...
  -> Finished parsing the build-deps
+Reading package lists...
+Building dependency tree...
+Reading state information...
+usrmerge is already the newest version (35).
+0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/golang-github-bsipos-thist-1.0.0/ && 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  > ../golang-github-bsipos-thist_1.0.0-2_source.changes
+I: user script /srv/workspace/pbuilder/3835/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/3835/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/golang-github-bsipos-thist-1.0.0/ && 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  > ../golang-github-bsipos-thist_1.0.0-2_source.changes
 dpkg-buildpackage: info: source package golang-github-bsipos-thist
 dpkg-buildpackage: info: source version 1.0.0-2
 dpkg-buildpackage: info: source distribution unstable
@@ -389,50 +407,50 @@
    dh_auto_configure -O--builddirectory=_build -O--buildsystem=golang
    dh_auto_build -O--builddirectory=_build -O--buildsystem=golang
 	cd _build && go install -trimpath -v -p 8 github.com/bsipos/thist
-internal/goarch
+internal/goos
 internal/unsafeheader
-internal/cpu
-internal/goexperiment
+internal/goarch
 internal/itoa
-internal/goos
+internal/goexperiment
 math/bits
+internal/cpu
 runtime/internal/syscall
-internal/abi
 unicode/utf8
+internal/abi
 runtime/internal/math
-internal/race
 runtime/internal/sys
+internal/race
 sync/atomic
 unicode
+image/color
 internal/goversion
 golang.org/x/image/math/f64
-image/color
-math
 crypto/internal/subtle
 crypto/subtle
-runtime/internal/atomic
-internal/bytealg
 crypto/internal/boring/sig
+math
 encoding
+internal/bytealg
+runtime/internal/atomic
 unicode/utf16
 image/color/palette
 runtime
 internal/reflectlite
 sync
-internal/testlog
 math/rand
+internal/testlog
 errors
 sort
-internal/oserror
 io
-path
-gonum.org/v1/plot/palette
+internal/oserror
 internal/safefilepath
+path
 strconv
+gonum.org/v1/plot/palette
 syscall
-hash
 bytes
 strings
+hash
 hash/crc32
 hash/adler32
 crypto
@@ -440,76 +458,76 @@
 reflect
 bufio
 go/build/constraint
-html
 regexp/syntax
+html
 image
-internal/syscall/unix
-time
 internal/syscall/execenv
+time
+internal/syscall/unix
 image/internal/imageutil
 regexp
 image/draw
 image/jpeg
+golang.org/x/image/draw
+internal/poll
 io/fs
 context
-internal/poll
-golang.org/x/image/draw
 os
 internal/fmtsort
 encoding/binary
 golang.org/x/image/ccitt
 crypto/md5
-crypto/cipher
 encoding/base64
+crypto/cipher
 golang.org/x/sys/unix
-fmt
 path/filepath
 internal/lazyregexp
 internal/godebug
+fmt
 io/ioutil
 crypto/internal/boring
 crypto/sha1
 os/exec
 internal/goroot
 golang.org/x/image/math/fixed
+go/token
 internal/buildcfg
 go/doc/comment
 golang.org/x/image/tiff/lzw
-go/token
-compress/flate
 encoding/gob
+compress/flate
 encoding/hex
 github.com/golang/freetype/raster
 golang.org/x/image/font
-encoding/json
 go/scanner
+encoding/json
 golang.org/x/image/font/basicfont
 encoding/xml
 go/ast
 compress/gzip
-compress/zlib
 github.com/golang/freetype/truetype
+compress/zlib
 image/png
-golang.org/x/term
 gonum.org/v1/plot/vg/fonts
+golang.org/x/term
 golang.org/x/image/tiff
-golang.org/x/crypto/ssh/terminal
 compress/lzw
-log
-runtime/debug
-github.com/fogleman/gg
-github.com/ajstarks/svgo
-image/gif
 go/doc
 go/internal/typeparams
+golang.org/x/crypto/ssh/terminal
+image/gif
 go/parser
+log
+github.com/ajstarks/svgo
+github.com/fogleman/gg
 github.com/jung-kurt/gofpdf
+runtime/debug
 go/build
 gonum.org/v1/plot/vg
-gonum.org/v1/plot/vg/vgeps
 gonum.org/v1/plot/vg/vgimg
 gonum.org/v1/plot/vg/vgsvg
 gonum.org/v1/plot/tools/bezier
+gonum.org/v1/plot/vg/vgeps
 gonum.org/v1/plot/vg/vgpdf
 gonum.org/v1/plot/vg/draw
 gonum.org/v1/plot
@@ -546,12 +564,14 @@
 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/3835/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3835/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/8906 and its subdirectories
-I: Current time: Mon May 13 10:57:27 -12 2024
-I: pbuilder-time-stamp: 1715641047
+I: removing directory /srv/workspace/pbuilder/3835 and its subdirectories
+I: Current time: Wed Apr 12 06:37:12 +14 2023
+I: pbuilder-time-stamp: 1681231032