Diff of the two buildlogs:

--
--- b1/build.log	2025-01-23 09:02:45.525603714 +0000
+++ b2/build.log	2025-01-23 09:03:29.567633373 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Jan 22 21:01:28 -12 2025
-I: pbuilder-time-stamp: 1737622888
+I: Current time: Thu Feb 26 05:25:48 +14 2026
+I: pbuilder-time-stamp: 1772033148
 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 golang-github-bsm-redeo_2.1.1-5.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/99535/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3650916/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 Feb 25 15:25 /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/3650916/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3650916/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='af79307b820e4860b50b72e9e62040fc'
-  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='99535'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=7cb8be4122be4abca32f51070ac67459
+  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=3650916
   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.6fNuAeCK/pbuilderrc_9mIq --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.6fNuAeCK/b1 --logfile b1/build.log golang-github-bsm-redeo_2.1.1-5.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.6fNuAeCK/pbuilderrc_zqny --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.6fNuAeCK/b2 --logfile b2/build.log golang-github-bsm-redeo_2.1.1-5.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 6.1.0-30-cloud-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-30-cloud-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/99535/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3650916/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -164,7 +196,7 @@
 Get: 49 http://deb.debian.org/debian trixie/main arm64 golang-gomega-dev all 1.34.2-2 [160 kB]
 Get: 50 http://deb.debian.org/debian trixie/main arm64 golang-github-onsi-ginkgo-dev all 1.16.5-5 [137 kB]
 Get: 51 http://deb.debian.org/debian trixie/main arm64 golang-github-bsm-pool-dev all 0.8.0-7 [5316 B]
-Fetched 74.5 MB in 1s (95.0 MB/s)
+Fetched 74.5 MB in 0s (254 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 ... 19970 files and directories currently installed.)
@@ -388,7 +420,11 @@
 fakeroot is already the newest version (1.36.2-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-bsm-redeo-2.1.1/ && 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-bsm-redeo_2.1.1-5_source.changes
+I: user script /srv/workspace/pbuilder/3650916/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/3650916/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-bsm-redeo-2.1.1/ && 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-bsm-redeo_2.1.1-5_source.changes
 dpkg-buildpackage: info: source package golang-github-bsm-redeo
 dpkg-buildpackage: info: source version 2.1.1-5
 dpkg-buildpackage: info: source distribution unstable
@@ -407,72 +443,72 @@
    dh_auto_configure -O--buildsystem=golang
    dh_auto_build -O--buildsystem=golang
 	cd obj-aarch64-linux-gnu && go install -trimpath -v -p 12 github.com/bsm/redeo github.com/bsm/redeo/client github.com/bsm/redeo/cmd/redeo-server-example github.com/bsm/redeo/info github.com/bsm/redeo/redeotest github.com/bsm/redeo/resp
-internal/goos
+internal/goarch
+internal/coverage/rtcov
 internal/byteorder
-internal/godebugs
-internal/goexperiment
-internal/unsafeheader
-internal/asan
 internal/race
-internal/coverage/rtcov
-internal/goarch
+internal/goos
 internal/profilerecord
+internal/goexperiment
 internal/runtime/syscall
-internal/itoa
-cmp
-math/bits
-internal/msan
+internal/unsafeheader
 internal/cpu
+internal/godebugs
 sync/atomic
-internal/chacha8rand
-runtime/internal/sys
 internal/abi
+internal/chacha8rand
 runtime/internal/math
+runtime/internal/sys
+internal/asan
+internal/itoa
+cmp
+internal/msan
+math/bits
+unicode
 unicode/utf8
-encoding
 internal/nettrace
-unicode
-math
+encoding
 log/internal
+math
 internal/bytealg
 internal/runtime/atomic
-internal/runtime/exithook
 internal/stringslite
+internal/runtime/exithook
 runtime
-sync
 internal/reflectlite
-iter
 internal/weak
+iter
+sync
 slices
 internal/bisect
-internal/testlog
 internal/singleflight
+internal/testlog
 runtime/cgo
 errors
 sort
-internal/godebug
-internal/oserror
+vendor/golang.org/x/net/dns/dnsmessage
 io
-strconv
+internal/oserror
 path
-vendor/golang.org/x/net/dns/dnsmessage
 math/rand/v2
-reflect
+strconv
+internal/godebug
 syscall
-bytes
-strings
 internal/concurrent
+bytes
 unique
+strings
+reflect
 net/netip
 github.com/bsm/redeo/info
+internal/syscall/execenv
 time
 internal/syscall/unix
-internal/syscall/execenv
 context
-io/fs
 internal/poll
-internal/filepathlite
+io/fs
 internal/fmtsort
+internal/filepathlite
 os
 fmt
 net
@@ -521,12 +557,14 @@
 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/3650916/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3650916/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/99535 and its subdirectories
-I: Current time: Wed Jan 22 21:02:44 -12 2025
-I: pbuilder-time-stamp: 1737622964
+I: removing directory /srv/workspace/pbuilder/3650916 and its subdirectories
+I: Current time: Thu Feb 26 05:26:28 +14 2026
+I: pbuilder-time-stamp: 1772033188