Diff of the two buildlogs:

--
--- b1/build.log	2025-01-20 12:04:33.987933387 +0000
+++ b2/build.log	2025-01-20 12:05:21.801775511 +0000
@@ -1,6 +1,7 @@
+W: cgroups are not available on the host, not using them.
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Feb 22 06:26:37 -12 2026
-I: pbuilder-time-stamp: 1771784797
+I: Current time: Mon Feb 23 08:27:35 +14 2026
+I: pbuilder-time-stamp: 1771784855
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +23,83 @@
 dpkg-source: info: unpacking golang-github-knadh-go-pop3_1.0.0-1.1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2161760/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3002647/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 22 18:27 /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/3002647/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3002647/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='8a062fba9b5b481ea87d9e48b42e626d'
-  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='2161760'
-  PS1='# '
-  PS2='> '
+  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=3002647
   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.GehJ5DkY/pbuilderrc_QmtE --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.GehJ5DkY/b1 --logfile b1/build.log golang-github-knadh-go-pop3_1.0.0-1.1.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.GehJ5DkY/pbuilderrc_f0TC --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.GehJ5DkY/b2 --logfile b2/build.log golang-github-knadh-go-pop3_1.0.0-1.1.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 codethink01-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  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/2161760/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/3002647/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -148,7 +180,7 @@
 Get: 37 http://deb.debian.org/debian trixie/main arm64 golang-golang-x-text-dev all 0.16.0-1 [4003 kB]
 Get: 38 http://deb.debian.org/debian trixie/main arm64 golang-github-emersion-go-textwrapper-dev all 0.0~git20160606.d0e65e5-2 [3100 B]
 Get: 39 http://deb.debian.org/debian trixie/main arm64 golang-github-emersion-go-message-dev all 0.17.0-1 [43.2 kB]
-Fetched 66.6 MB in 0s (136 MB/s)
+Fetched 66.6 MB in 0s (243 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.)
@@ -319,7 +351,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-knadh-go-pop3-1.0.0/ && 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-knadh-go-pop3_1.0.0-1.1_source.changes
+I: user script /srv/workspace/pbuilder/3002647/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/3002647/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-knadh-go-pop3-1.0.0/ && 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-knadh-go-pop3_1.0.0-1.1_source.changes
 dpkg-buildpackage: info: source package golang-github-knadh-go-pop3
 dpkg-buildpackage: info: source version 1.0.0-1.1
 dpkg-buildpackage: info: source distribution unstable
@@ -340,22 +376,22 @@
 	cd _build && go install -trimpath -v -p 12 github.com/knadh/go-pop3
 internal/goarch
 internal/unsafeheader
+internal/goexperiment
+internal/runtime/syscall
 internal/byteorder
-internal/coverage/rtcov
+unicode
 internal/goos
-internal/goexperiment
-internal/cpu
 internal/godebugs
-sync/atomic
-unicode
-internal/abi
 internal/profilerecord
+internal/race
+unicode/utf8
+internal/coverage/rtcov
+internal/cpu
+sync/atomic
 runtime/internal/math
 runtime/internal/sys
-internal/runtime/syscall
-unicode/utf8
+internal/abi
 internal/chacha8rand
-internal/race
 container/list
 internal/asan
 internal/itoa
@@ -370,56 +406,56 @@
 vendor/golang.org/x/crypto/internal/alias
 internal/nettrace
 internal/bytealg
-math
 internal/runtime/atomic
+math
 internal/runtime/exithook
 internal/stringslite
 runtime
-sync
-iter
 internal/reflectlite
+sync
 internal/weak
+iter
 slices
 internal/bisect
 internal/testlog
 internal/singleflight
 runtime/cgo
 errors
-sort
 internal/godebug
+sort
 io
 internal/oserror
-path
-vendor/golang.org/x/net/dns/dnsmessage
-math/rand/v2
-crypto/internal/edwards25519/field
-crypto/internal/nistec/fiat
 strconv
-syscall
 math/rand
+crypto/internal/nistec/fiat
+math/rand/v2
+path
+crypto/internal/edwards25519/field
+vendor/golang.org/x/net/dns/dnsmessage
 bytes
+crypto/internal/randutil
+syscall
 strings
 hash
-crypto/internal/randutil
-bufio
-crypto/cipher
 github.com/emersion/go-textwrapper
+internal/concurrent
+unique
+crypto/internal/edwards25519
+crypto/cipher
+bufio
 crypto
+crypto/des
 reflect
-crypto/internal/edwards25519
 crypto/rc4
-internal/concurrent
-crypto/md5
-unique
+net/netip
 crypto/internal/boring
-crypto/des
+crypto/md5
 crypto/aes
 crypto/sha512
 crypto/hmac
 crypto/sha1
-crypto/sha256
-net/netip
 vendor/golang.org/x/crypto/hkdf
+crypto/sha256
 time
 internal/syscall/unix
 internal/syscall/execenv
@@ -432,23 +468,23 @@
 os
 internal/fmtsort
 encoding/binary
+crypto/ecdh
 vendor/golang.org/x/crypto/chacha20
 vendor/golang.org/x/crypto/internal/poly1305
 encoding/base64
-crypto/ecdh
 encoding/pem
 vendor/golang.org/x/crypto/chacha20poly1305
 fmt
 vendor/golang.org/x/sys/cpu
+net
 path/filepath
 io/ioutil
 vendor/golang.org/x/crypto/sha3
 math/big
 net/url
+encoding/hex
 mime
 mime/quotedprintable
-encoding/hex
-net
 crypto/elliptic
 crypto/internal/bigmod
 crypto/internal/boring/bbig
@@ -494,12 +530,14 @@
 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/3002647/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3002647/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/2161760 and its subdirectories
-I: Current time: Sun Feb 22 06:27:31 -12 2026
-I: pbuilder-time-stamp: 1771784851
+I: removing directory /srv/workspace/pbuilder/3002647 and its subdirectories
+I: Current time: Mon Feb 23 08:28:18 +14 2026
+I: pbuilder-time-stamp: 1771784898