Diff of the two buildlogs:

--
--- b1/build.log	2024-05-12 17:08:27.145338578 +0000
+++ b2/build.log	2024-05-12 17:10:06.361110189 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun May 12 05:05:12 -12 2024
-I: pbuilder-time-stamp: 1715533512
+I: Current time: Sun Jun 15 13:31:30 +14 2025
+I: pbuilder-time-stamp: 1749943890
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -26,52 +26,84 @@
 dpkg-source: info: unpacking golang-github-jackc-pgx_4.18.1-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1248610/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3466932/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos15-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 Jun 14 23:31 /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/3466932/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3466932/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'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=20 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='amd64'
+  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]="21" [3]="1" [4]="release" [5]="x86_64-pc-linux-gnu")
+  BASH_VERSION='5.2.21(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=42 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='146b3fb149e94570819f1b9b8890ba74'
-  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='1248610'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=a77bfc631d8242c081ddad56a5731693
+  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=3466932
   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.B9QYa0oD/pbuilderrc_iNRu --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.B9QYa0oD/b1 --logfile b1/build.log golang-github-jackc-pgx_4.18.1-1.dsc'
-  SUDO_GID='111'
-  SUDO_UID='106'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://46.16.76.132:3128'
+  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.B9QYa0oD/pbuilderrc_Iwdn --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.B9QYa0oD/b2 --logfile b2/build.log golang-github-jackc-pgx_4.18.1-1.dsc'
+  SUDO_GID=111
+  SUDO_UID=106
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://213.165.73.152:3128
 I: uname -a
-  Linux ionos11-amd64 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 10 11:25 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1248610/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Jun 14 18:01 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3466932/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -230,7 +262,7 @@
 Get: 89 http://deb.debian.org/debian trixie/main amd64 golang-github-jcmturner-gokrb5.v8-dev all 8.4.3-2 [119 kB]
 Get: 90 http://deb.debian.org/debian trixie/main amd64 golang-github-lib-pq-dev all 1.10.9-2 [86.6 kB]
 Get: 91 http://deb.debian.org/debian trixie/main amd64 golang-github-jackc-pgtype-dev all 1.10.0-4 [92.5 kB]
-Fetched 74.3 MB in 16s (4589 kB/s)
+Fetched 74.3 MB in 1s (91.7 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package golang-golang-x-sys-dev.
 (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 ... 19700 files and directories currently installed.)
@@ -609,7 +641,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-jackc-pgx-4.18.1/ && 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-jackc-pgx_4.18.1-1_source.changes
+I: user script /srv/workspace/pbuilder/3466932/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/3466932/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-jackc-pgx-4.18.1/ && 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-jackc-pgx_4.18.1-1_source.changes
 dpkg-buildpackage: info: source package golang-github-jackc-pgx
 dpkg-buildpackage: info: source version 4.18.1-1
 dpkg-buildpackage: info: source distribution unstable
@@ -678,179 +714,179 @@
 src/github.com/jackc/pgx/v4/stdlib/sql.go
 src/github.com/jackc/pgx/v4/stdlib/bench_test.go
 src/github.com/jackc/pgx/v4/stdlib/sql_test.go
-	cd _build && go install -trimpath -v -p 20 github.com/jackc/pgx/v4 github.com/jackc/pgx/v4/internal/sanitize github.com/jackc/pgx/v4/log/kitlogadapter github.com/jackc/pgx/v4/log/log15adapter github.com/jackc/pgx/v4/log/logrusadapter github.com/jackc/pgx/v4/log/testingadapter github.com/jackc/pgx/v4/log/zapadapter github.com/jackc/pgx/v4/log/zerologadapter github.com/jackc/pgx/v4/pgxpool github.com/jackc/pgx/v4/stdlib
+	cd _build && go install -trimpath -v -p 42 github.com/jackc/pgx/v4 github.com/jackc/pgx/v4/internal/sanitize github.com/jackc/pgx/v4/log/kitlogadapter github.com/jackc/pgx/v4/log/log15adapter github.com/jackc/pgx/v4/log/logrusadapter github.com/jackc/pgx/v4/log/testingadapter github.com/jackc/pgx/v4/log/zapadapter github.com/jackc/pgx/v4/log/zerologadapter github.com/jackc/pgx/v4/pgxpool github.com/jackc/pgx/v4/stdlib
+internal/godebugs
 internal/unsafeheader
 internal/coverage/rtcov
-internal/godebugs
-internal/goarch
-unicode/utf16
-internal/race
+math/bits
 internal/goos
 internal/goexperiment
-internal/itoa
-crypto/subtle
+unicode/utf8
+internal/goarch
+internal/nettrace
+internal/race
+unicode/utf16
+crypto/internal/alias
+vendor/golang.org/x/crypto/cryptobyte/asn1
+vendor/golang.org/x/crypto/internal/alias
+encoding
+log/internal
 unicode
-internal/cpu
+internal/itoa
 container/list
 cmp
-runtime/internal/atomic
+crypto/subtle
 crypto/internal/boring/sig
-crypto/internal/alias
-internal/abi
-sync/atomic
-unicode/utf8
+runtime/internal/atomic
 runtime/internal/syscall
-math/bits
+internal/cpu
+sync/atomic
 runtime/internal/math
 internal/chacha8rand
-vendor/golang.org/x/crypto/cryptobyte/asn1
-internal/nettrace
-vendor/golang.org/x/crypto/internal/alias
-encoding
 runtime/internal/sys
-log/internal
-internal/bytealg
+internal/abi
 slices
+internal/bytealg
 math
 runtime
 internal/reflectlite
 sync
-internal/testlog
-internal/bisect
 internal/singleflight
 go.uber.org/zap/internal/pool
+internal/bisect
+internal/testlog
 runtime/cgo
 errors
 sort
-internal/godebug
 internal/oserror
+internal/safefilepath
+path
+internal/godebug
 io
 strconv
-internal/safefilepath
+crypto/internal/nistec/fiat
 vendor/golang.org/x/net/dns/dnsmessage
-path
+bytes
 internal/intern
-math/rand
-crypto/internal/nistec/fiat
+strings
+crypto/rc4
+reflect
+hash
 syscall
-bytes
+math/rand
 golang.org/x/text/internal/tag
-hash
-strings
 crypto/internal/randutil
 github.com/jackc/chunkreader/v2
-hash/crc32
 crypto
-crypto/rc4
+hash/crc32
 net/netip
-reflect
 golang.org/x/text/transform
 vendor/golang.org/x/text/transform
-regexp/syntax
-net/http/internal/ascii
-bufio
 golang.org/x/text/runes
 golang.org/x/text/width
+net/http/internal/ascii
+bufio
+regexp/syntax
 internal/syscall/execenv
 internal/syscall/unix
 time
 regexp
 context
-io/fs
 go.uber.org/zap/buffer
+io/fs
 internal/poll
 go.uber.org/zap/internal/bufferpool
-go.uber.org/zap/internal/stacktrace
 embed
-internal/fmtsort
-encoding/binary
 github.com/jackc/pgconn/internal/ctxwatch
 github.com/jackc/puddle
+internal/fmtsort
+encoding/binary
+go.uber.org/zap/internal/stacktrace
 os
 crypto/md5
+encoding/base64
+github.com/jackc/pgio
 crypto/cipher
+vendor/golang.org/x/crypto/internal/poly1305
 crypto/internal/edwards25519/field
-encoding/base64
 crypto/internal/nistec
-vendor/golang.org/x/crypto/internal/poly1305
-github.com/jackc/pgio
 golang.org/x/sys/unix
 encoding/pem
-crypto/internal/boring
+crypto/internal/edwards25519
 crypto/des
 vendor/golang.org/x/crypto/chacha20
+crypto/internal/boring
 crypto/hmac
-crypto/sha512
 crypto/sha1
+crypto/sha512
 crypto/aes
 crypto/sha256
-crypto/internal/edwards25519
 vendor/golang.org/x/crypto/hkdf
 golang.org/x/crypto/pbkdf2
-fmt
-path/filepath
+crypto/ecdh
 github.com/jackc/pgpassfile
 io/ioutil
 go.uber.org/zap/internal/exit
+path/filepath
+fmt
 vendor/golang.org/x/sys/cpu
-crypto/ecdh
-net
 vendor/golang.org/x/crypto/chacha20poly1305
-database/sql/driver
 encoding/hex
-net/url
-encoding/json
+database/sql/driver
 github.com/jackc/pgservicefile
+net/url
 log
-github.com/go-logfmt/logfmt
-os/user
 go.uber.org/zap/internal/color
-golang.org/x/text/internal/language
 flag
-mime
-vendor/golang.org/x/net/http2/hpack
 mime/quotedprintable
-math/big
+net/http/internal
+vendor/golang.org/x/net/http2/hpack
+mime
+encoding/json
+github.com/go-logfmt/logfmt
+golang.org/x/text/internal/language
+compress/flate
 vendor/golang.org/x/text/unicode/norm
+math/big
 golang.org/x/text/unicode/norm
-compress/flate
-net/http/internal
 github.com/jackc/pgx/v4/internal/sanitize
 golang.org/x/text/unicode/bidi
 vendor/golang.org/x/text/unicode/bidi
 database/sql
-vendor/golang.org/x/text/secure/bidirule
 compress/gzip
-golang.org/x/text/internal/language/compact
 golang.org/x/text/secure/bidirule
+golang.org/x/text/internal/language/compact
+vendor/golang.org/x/text/secure/bidirule
 golang.org/x/text/language
+os/user
+net
 vendor/golang.org/x/net/idna
-github.com/jackc/pgproto3/v2
 github.com/go-kit/log
 go.uber.org/atomic
+github.com/jackc/pgproto3/v2
 github.com/mattn/go-isatty
 github.com/sirupsen/logrus
 github.com/mattn/go-colorable
-golang.org/x/text/internal
+go.uber.org/multierr
 github.com/go-kit/log/level
+golang.org/x/text/internal
 golang.org/x/text/cases
-go.uber.org/multierr
 crypto/rand
-crypto/internal/bigmod
+crypto/elliptic
+crypto/internal/boring/bbig
 crypto/dsa
+crypto/internal/bigmod
 encoding/asn1
-crypto/internal/boring/bbig
-crypto/elliptic
-crypto/ed25519
 go.uber.org/zap/zapcore
+crypto/ed25519
 crypto/rsa
 golang.org/x/text/secure/precis
-vendor/golang.org/x/crypto/cryptobyte
 crypto/x509/pkix
-go.uber.org/zap/internal
+vendor/golang.org/x/crypto/cryptobyte
 crypto/ecdsa
-net/textproto
+go.uber.org/zap/internal
 vendor/golang.org/x/net/http/httpproxy
+net/textproto
 github.com/rs/zerolog/internal/json
 crypto/x509
 github.com/jackc/pgtype
@@ -858,18 +894,18 @@
 mime/multipart
 github.com/rs/zerolog
 crypto/tls
-github.com/jackc/pgconn
 net/http/httptrace
+github.com/jackc/pgconn
 net/http
 github.com/jackc/pgconn/stmtcache
 github.com/jackc/pgx/v4
 github.com/jackc/pgx/v4/log/kitlogadapter
 github.com/jackc/pgx/v4/log/logrusadapter
 github.com/jackc/pgx/v4/log/zerologadapter
-github.com/jackc/pgx/v4/log/log15adapter
-github.com/jackc/pgx/v4/pgxpool
 github.com/jackc/pgx/v4/log/testingadapter
 github.com/jackc/pgx/v4/stdlib
+github.com/jackc/pgx/v4/log/log15adapter
+github.com/jackc/pgx/v4/pgxpool
 go.uber.org/zap
 github.com/jackc/pgx/v4/log/zapadapter
    debian/rules override_dh_auto_test
@@ -906,12 +942,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: including full source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/3466932/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3466932/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/1248610 and its subdirectories
-I: Current time: Sun May 12 05:08:25 -12 2024
-I: pbuilder-time-stamp: 1715533705
+I: removing directory /srv/workspace/pbuilder/3466932 and its subdirectories
+I: Current time: Sun Jun 15 13:33:05 +14 2025
+I: pbuilder-time-stamp: 1749943985