Diff of the two buildlogs:

--
--- b1/build.log	2024-11-23 01:52:37.503077076 +0000
+++ b2/build.log	2024-11-23 01:54:58.104699844 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri Nov 22 13:51:24 -12 2024
-I: pbuilder-time-stamp: 1732326684
+I: Current time: Fri Dec 26 22:15:40 +14 2025
+I: pbuilder-time-stamp: 1766736940
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -26,51 +26,83 @@
 dpkg-source: info: unpacking golang-github-emersion-go-milter_0.3.3-2.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2711335/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2012476/tmp/hooks/D01_modify_environment starting
+debug: Running on infom02-amd64.
+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 Dec 26 08:15 /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/2012476/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2012476/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='amd64'
-  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]="32" [3]="1" [4]="release" [5]="x86_64-pc-linux-gnu")
+  BASH_VERSION='5.2.32(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=amd64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=12 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='amd64'
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='d602ed4f52b6485da98282bf4438f779'
-  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='2711335'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=1f82415d3d394ffda6488d98298da0f8
+  LANG=C
+  LANGUAGE=et_EE:et
+  LC_ALL=C
+  MACHTYPE=x86_64-pc-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=2012476
   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.8WeENkQa/pbuilderrc_sFCN --distribution unstable --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.8WeENkQa/b1 --logfile b1/build.log golang-github-emersion-go-milter_0.3.3-2.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'
+  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.8WeENkQa/pbuilderrc_jAfe --distribution unstable --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.8WeENkQa/b2 --logfile b2/build.log golang-github-emersion-go-milter_0.3.3-2.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'
 I: uname -a
-  Linux infom01-amd64 6.1.0-27-cloud-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.115-1 (2024-11-01) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.11.5+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.11.5-1~bpo12+1 (2024-11-11) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Aug  4 21:30 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/2711335/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Aug  4  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2012476/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -150,7 +182,7 @@
 Get: 36 http://deb.debian.org/debian unstable/main amd64 golang-golang-x-text-dev all 0.16.0-1 [4003 kB]
 Get: 37 http://deb.debian.org/debian unstable/main amd64 golang-github-emersion-go-textwrapper-dev all 0.0~git20160606.d0e65e5-2 [3100 B]
 Get: 38 http://deb.debian.org/debian unstable/main amd64 golang-github-emersion-go-message-dev all 0.17.0-1 [43.2 kB]
-Fetched 70.1 MB in 0s (169 MB/s)
+Fetched 70.1 MB in 1s (55.0 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sensible-utils.
 (Reading database ... 
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(Reading database ... 100%
(Reading database ... 19966 files and directories currently installed.)
@@ -317,7 +349,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-emersion-go-milter-0.3.3/ && 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-emersion-go-milter_0.3.3-2_source.changes
+I: user script /srv/workspace/pbuilder/2012476/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/2012476/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-emersion-go-milter-0.3.3/ && 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-emersion-go-milter_0.3.3-2_source.changes
 dpkg-buildpackage: info: source package golang-github-emersion-go-milter
 dpkg-buildpackage: info: source version 0.3.3-2
 dpkg-buildpackage: info: source distribution unstable
@@ -336,29 +372,29 @@
    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 12 github.com/emersion/go-milter
+internal/byteorder
+internal/godebugs
+internal/unsafeheader
+internal/goexperiment
+internal/coverage/rtcov
 internal/goos
+internal/profilerecord
 internal/goarch
 internal/runtime/atomic
-internal/runtime/syscall
-internal/goexperiment
-internal/godebugs
-internal/profilerecord
-internal/cpu
-internal/abi
-internal/coverage/rtcov
-runtime/internal/math
-internal/byteorder
 internal/race
-internal/unsafeheader
-runtime/internal/sys
 sync/atomic
-unicode/utf8
-math/bits
-internal/itoa
+internal/cpu
 unicode
+internal/runtime/syscall
+unicode/utf8
 cmp
-internal/chacha8rand
+internal/itoa
+math/bits
 internal/asan
+internal/chacha8rand
+internal/abi
+runtime/internal/math
+runtime/internal/sys
 internal/msan
 crypto/internal/alias
 crypto/subtle
@@ -370,53 +406,53 @@
 math
 internal/stringslite
 runtime
+iter
 internal/reflectlite
 internal/weak
 sync
-iter
 slices
-internal/bisect
-internal/singleflight
 internal/testlog
-runtime/cgo
+internal/singleflight
+internal/bisect
 errors
 sort
-internal/oserror
+runtime/cgo
 io
 strconv
+internal/oserror
 internal/godebug
 vendor/golang.org/x/net/dns/dnsmessage
 path
 math/rand/v2
+math/rand
 syscall
 bytes
 strings
 hash
-internal/concurrent
 crypto/internal/randutil
-math/rand
+internal/concurrent
 unique
-reflect
 crypto
-crypto/cipher
+reflect
 net/netip
+crypto/cipher
 bufio
 crypto/internal/boring
-internal/syscall/execenv
 time
 internal/syscall/unix
-io/fs
-internal/poll
+internal/syscall/execenv
 context
+internal/poll
+io/fs
 internal/filepathlite
 encoding/binary
 internal/fmtsort
 os
 io/ioutil
 fmt
-net
-log
 math/big
+log
+net
 crypto/rand
 net/textproto
 github.com/emersion/go-message/textproto
@@ -426,7 +462,7 @@
 === RUN   TestMilterClient_UsualFlow
 --- PASS: TestMilterClient_UsualFlow (0.00s)
 PASS
-ok  	github.com/emersion/go-milter	0.004s
+ok  	github.com/emersion/go-milter	0.015s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--builddirectory=_build -O--buildsystem=golang
    dh_prep -O--builddirectory=_build -O--buildsystem=golang
@@ -453,12 +489,14 @@
 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/2012476/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2012476/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/2711335 and its subdirectories
-I: Current time: Fri Nov 22 13:52:36 -12 2024
-I: pbuilder-time-stamp: 1732326756
+I: removing directory /srv/workspace/pbuilder/2012476 and its subdirectories
+I: Current time: Fri Dec 26 22:17:57 +14 2025
+I: pbuilder-time-stamp: 1766737077