Diff of the two buildlogs:

--
--- b1/build.log	2023-05-22 12:02:49.220220404 +0000
+++ b2/build.log	2023-05-22 12:05:08.098126335 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun May 21 23:59:43 -12 2023
-I: pbuilder-time-stamp: 1684756783
+I: Current time: Mon Jun 24 08:25:51 +14 2024
+I: pbuilder-time-stamp: 1719167151
 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-shurcool-gopherjslib_0.0~git20200209.30f639d.orig.tar.xz]
 I: copying [./golang-github-shurcool-gopherjslib_0.0~git20200209.30f639d-3.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Sun Nov 22 14:58:14 2020 -12
+gpgv: Signature made Mon Nov 23 16:58:14 2020 +14
 gpgv:                using RSA key 6201FBFFDBBDE07822EABB9696FCAC0D387B5847
 gpgv:                issuer "debian@alteholz.de"
 gpgv: Can't check signature: No public key
@@ -26,52 +26,84 @@
 dpkg-source: info: unpacking golang-github-shurcool-gopherjslib_0.0~git20200209.30f639d-3.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/9846/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/9032/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink11-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 Jun 24 08:26 /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/9032/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/9032/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'
-  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]="15" [3]="1" [4]="release" [5]="aarch64-unknown-linux-gnu")
+  BASH_VERSION='5.2.15(1)-release'
+  BUILDDIR=/build
+  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 '
-  DISTRIBUTION='bookworm'
-  HOME='/var/lib/jenkins'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=bookworm
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/var/lib/jenkins
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  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='9846'
-  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=9032
   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.HwesYWM7/pbuilderrc_F6EY --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.HwesYWM7/b1 --logfile b1/build.log golang-github-shurcool-gopherjslib_0.0~git20200209.30f639d-3.dsc'
-  SUDO_GID='117'
-  SUDO_UID='110'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  USERNAME='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.16:3128'
+  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.HwesYWM7/pbuilderrc_et85 --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.HwesYWM7/b2 --logfile b2/build.log --extrapackages usrmerge golang-github-shurcool-gopherjslib_0.0~git20200209.30f639d-3.dsc'
+  SUDO_GID=117
+  SUDO_UID=110
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  USERNAME=root
+  _='I: set'
+  http_proxy=http://192.168.101.16:3128
 I: uname -a
-  Linux codethink10-arm64 4.15.0-211-generic #222-Ubuntu SMP Tue Apr 18 18:58:27 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-211-generic #222-Ubuntu SMP Tue Apr 18 18:58:27 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 19 22:24 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/9846/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Jun 24 06:48 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/9032/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -188,7 +220,7 @@
 Get: 73 http://deb.debian.org/debian bookworm/main arm64 golang-golang-x-mod-dev all 0.7.0-1 [101 kB]
 Get: 74 http://deb.debian.org/debian bookworm/main arm64 golang-golang-x-tools-dev all 1:0.5.0+ds-1 [1469 kB]
 Get: 75 http://deb.debian.org/debian bookworm/main arm64 golang-github-gopherjs-gopherjs-dev all 0.0~git20170927.0.4152256-7 [172 kB]
-Fetched 103 MB in 3s (35.7 MB/s)
+Fetched 103 MB in 5s (20.3 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.)
@@ -505,10 +537,15 @@
 Reading package lists...
 Building dependency tree...
 Reading state information...
+usrmerge is already the newest version (35).
 fakeroot is already the newest version (1.31-1.2).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/golang-github-shurcool-gopherjslib-0.0~git20200209.30f639d/ && 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-shurcool-gopherjslib_0.0~git20200209.30f639d-3_source.changes
+I: user script /srv/workspace/pbuilder/9032/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/9032/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/golang-github-shurcool-gopherjslib-0.0~git20200209.30f639d/ && 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-shurcool-gopherjslib_0.0~git20200209.30f639d-3_source.changes
 dpkg-buildpackage: info: source package golang-github-shurcool-gopherjslib
 dpkg-buildpackage: info: source version 0.0~git20200209.30f639d-3
 dpkg-buildpackage: info: source distribution unstable
@@ -529,15 +566,15 @@
 	cd obj-aarch64-linux-gnu && go install -trimpath -v -p 8 github.com/shurcooL/gopherjslib
 internal/goarch
 internal/unsafeheader
-internal/cpu
 internal/goexperiment
 internal/goos
-runtime/internal/syscall
 internal/race
-sync/atomic
+internal/cpu
 internal/abi
 runtime/internal/math
+runtime/internal/syscall
 runtime/internal/sys
+sync/atomic
 unicode
 unicode/utf8
 internal/itoa
@@ -546,11 +583,11 @@
 unicode/utf16
 github.com/gopherjs/gopherjs/compiler/prelude
 internal/goversion
-crypto/internal/subtle
 container/list
+crypto/internal/subtle
+crypto/subtle
 internal/bytealg
 runtime/internal/atomic
-crypto/subtle
 crypto/internal/boring/sig
 vendor/golang.org/x/crypto/cryptobyte/asn1
 math
@@ -560,104 +597,104 @@
 internal/reflectlite
 sync
 internal/testlog
-math/rand
 internal/singleflight
+math/rand
 runtime/cgo
 errors
 sort
 io
 internal/oserror
-strconv
-path
 internal/safefilepath
+path
+strconv
 crypto/internal/nistec/fiat
-vendor/golang.org/x/net/dns/dnsmessage
 syscall
+vendor/golang.org/x/net/dns/dnsmessage
+container/heap
 bytes
 strings
-container/heap
 hash
 hash/crc32
 crypto/internal/randutil
-vendor/golang.org/x/text/transform
 crypto
 reflect
 crypto/rc4
+vendor/golang.org/x/text/transform
 bufio
 regexp/syntax
 go/build/constraint
 net/http/internal/ascii
 internal/syscall/unix
-time
 internal/syscall/execenv
+time
 regexp
 internal/poll
-context
 io/fs
+context
 embed
-os
 internal/fmtsort
 encoding/binary
+os
 encoding/base64
 crypto/cipher
 crypto/internal/edwards25519/field
 crypto/md5
-vendor/golang.org/x/crypto/internal/poly1305
 crypto/internal/nistec
+vendor/golang.org/x/crypto/internal/poly1305
 golang.org/x/sys/unix
-vendor/golang.org/x/crypto/curve25519/internal/field
 encoding/pem
-fmt
-path/filepath
-internal/lazyregexp
-internal/godebug
-io/ioutil
-crypto/des
+vendor/golang.org/x/crypto/curve25519/internal/field
 crypto/internal/edwards25519
 crypto/internal/boring
-internal/intern
+crypto/des
+vendor/golang.org/x/crypto/chacha20
 crypto/aes
 crypto/sha512
 crypto/hmac
+fmt
+path/filepath
+internal/lazyregexp
+internal/godebug
+io/ioutil
 crypto/sha1
 crypto/sha256
-os/exec
+internal/intern
+vendor/golang.org/x/crypto/chacha20poly1305
 net/netip
-vendor/golang.org/x/crypto/chacha20
+os/exec
 vendor/golang.org/x/crypto/hkdf
-vendor/golang.org/x/crypto/chacha20poly1305
 internal/goroot
-encoding/json
+net
 go/token
-go/doc/comment
-encoding/gob
 math/big
+encoding/gob
 internal/buildcfg
+encoding/json
+go/doc/comment
 log
 go/scanner
 text/scanner
+go/ast
 net/url
 compress/flate
-go/ast
+github.com/fsnotify/fsnotify
 encoding/hex
-net
 vendor/golang.org/x/crypto/curve25519
 vendor/golang.org/x/text/unicode/bidi
-compress/gzip
-vendor/golang.org/x/text/unicode/norm
 vendor/golang.org/x/net/http2/hpack
-github.com/fsnotify/fsnotify
-go/internal/typeparams
-go/parser
-go/doc
+vendor/golang.org/x/text/unicode/norm
+compress/gzip
 mime
-vendor/golang.org/x/text/secure/bidirule
 mime/quotedprintable
 net/http/internal
+go/internal/typeparams
+go/doc
 github.com/neelance/sourcemap
-go/constant
+go/parser
+vendor/golang.org/x/text/secure/bidirule
 crypto/rand
 crypto/elliptic
+go/constant
 crypto/internal/boring/bbig
 encoding/asn1
 crypto/ed25519
@@ -669,20 +706,20 @@
 go/build
 go/types
 crypto/ecdsa
-crypto/x509
 net/textproto
 vendor/golang.org/x/net/http/httpproxy
+crypto/x509
 vendor/golang.org/x/net/http/httpguts
 mime/multipart
+crypto/tls
 github.com/gopherjs/gopherjs/compiler/astutil
-github.com/gopherjs/gopherjs/compiler/typesutil
 github.com/gopherjs/gopherjs/compiler/vendor/github.com/neelance/astrewrite
-github.com/gopherjs/gopherjs/compiler/vendor/golang.org/x/tools/go/gcimporter15
 golang.org/x/tools/internal/typeparams
+github.com/gopherjs/gopherjs/compiler/vendor/golang.org/x/tools/go/gcimporter15
+github.com/gopherjs/gopherjs/compiler/typesutil
 github.com/gopherjs/gopherjs/compiler/filter
 github.com/gopherjs/gopherjs/compiler/analysis
 golang.org/x/tools/go/ast/astutil
-crypto/tls
 golang.org/x/tools/go/types/typeutil
 github.com/gopherjs/gopherjs/compiler
 net/http/httptrace
@@ -722,12 +759,14 @@
 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/9032/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/9032/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/9846 and its subdirectories
-I: Current time: Mon May 22 00:02:48 -12 2023
-I: pbuilder-time-stamp: 1684756968
+I: removing directory /srv/workspace/pbuilder/9032 and its subdirectories
+I: Current time: Mon Jun 24 08:28:06 +14 2024
+I: pbuilder-time-stamp: 1719167286