Diff of the two buildlogs:

--
--- b1/build.log	2025-02-22 11:44:55.026866919 +0000
+++ b2/build.log	2025-02-22 11:45:50.432365613 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri Feb 21 23:44:07 -12 2025
-I: pbuilder-time-stamp: 1740224647
+I: Current time: Sat Mar 28 08:07:57 +14 2026
+I: pbuilder-time-stamp: 1774634877
 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-letsencrypt-challtestsrv_1.3.2+ds-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/225879/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1370130/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 Mar 27 18:08 /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/1370130/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1370130/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='7d243bc98da14031a4b86078d6c3cd89'
-  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='225879'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=17db0d221ef745e183cc75f64d486b8a
+  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=1370130
   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.DV4szWR0/pbuilderrc_dZr4 --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.DV4szWR0/b1 --logfile b1/build.log golang-github-letsencrypt-challtestsrv_1.3.2+ds-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.DV4szWR0/pbuilderrc_X574 --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.DV4szWR0/b2 --logfile b2/build.log golang-github-letsencrypt-challtestsrv_1.3.2+ds-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 codethink04-arm64 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) 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/225879/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/1370130/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -80,7 +112,7 @@
 Depends: debhelper-compat (= 13), dh-golang, golang-any, golang-github-miekg-dns-dev
 dpkg-deb: building package 'pbuilder-satisfydepends-dummy' in '/tmp/satisfydepends-aptitude/pbuilder-satisfydepends-dummy.deb'.
 Selecting previously unselected package pbuilder-satisfydepends-dummy.
-(Reading database ... 19972 files and directories currently installed.)
+(Reading database ... 19922 files and directories currently installed.)
 Preparing to unpack .../pbuilder-satisfydepends-dummy.deb ...
 Unpacking pbuilder-satisfydepends-dummy (0.invalid.0) ...
 dpkg: pbuilder-satisfydepends-dummy: dependency problems, but configuring anyway as you requested:
@@ -154,10 +186,10 @@
 Get: 43 http://deb.debian.org/debian trixie/main arm64 golang-golang-x-net-dev all 1:0.27.0-1 [898 kB]
 Get: 44 http://deb.debian.org/debian trixie/main arm64 golang-golang-x-sync-dev all 0.7.0-1 [19.0 kB]
 Get: 45 http://deb.debian.org/debian trixie/main arm64 golang-github-miekg-dns-dev all 1.1.63-1 [180 kB]
-Fetched 74.2 MB in 0s (202 MB/s)
+Fetched 74.2 MB in 0s (186 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 ... 19972 files and directories currently installed.)
+(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 ... 19922 files and directories currently installed.)
 Preparing to unpack .../00-sensible-utils_0.0.24_all.deb ...
 Unpacking sensible-utils (0.0.24) ...
 Selecting previously unselected package libmagic-mgc.
@@ -349,7 +381,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-letsencrypt-challtestsrv-1.3.2+ds/ && 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-letsencrypt-challtestsrv_1.3.2+ds-1_source.changes
+I: user script /srv/workspace/pbuilder/1370130/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/1370130/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-letsencrypt-challtestsrv-1.3.2+ds/ && 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-letsencrypt-challtestsrv_1.3.2+ds-1_source.changes
 dpkg-buildpackage: info: source package golang-github-letsencrypt-challtestsrv
 dpkg-buildpackage: info: source version 1.3.2+ds-1
 dpkg-buildpackage: info: source distribution unstable
@@ -368,43 +404,43 @@
    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/letsencrypt/challtestsrv
-internal/coverage/rtcov
 internal/goarch
-internal/byteorder
+internal/goos
 internal/unsafeheader
-internal/msan
+internal/coverage/rtcov
 internal/godebugs
+internal/asan
 internal/profilerecord
+internal/msan
 internal/goexperiment
-internal/goos
-internal/asan
+internal/byteorder
 internal/cpu
-internal/runtime/syscall
+sync/atomic
 internal/abi
+internal/runtime/syscall
 internal/runtime/math
 math/bits
 internal/itoa
 unicode/utf8
-internal/chacha8rand
 unicode
 crypto/internal/fips140/alias
-sync/atomic
-crypto/internal/fips140deps/byteorder
 cmp
-crypto/internal/fips140/subtle
+internal/chacha8rand
+crypto/internal/fips140deps/byteorder
 crypto/internal/boring/sig
 unicode/utf16
 vendor/golang.org/x/crypto/cryptobyte/asn1
+crypto/internal/fips140/subtle
 container/list
 vendor/golang.org/x/crypto/internal/alias
 internal/nettrace
 golang.org/x/net/internal/iana
 log/internal
-math
+internal/bytealg
 internal/runtime/atomic
-internal/runtime/sys
+math
 crypto/internal/fips140deps/cpu
-internal/bytealg
+internal/runtime/sys
 internal/runtime/exithook
 internal/stringslite
 internal/race
@@ -413,66 +449,66 @@
 runtime
 internal/reflectlite
 iter
-weak
 crypto/subtle
+weak
 sync
 maps
 slices
-internal/bisect
-internal/testlog
-internal/singleflight
-unique
-runtime/cgo
 errors
 sort
 internal/oserror
-io
-strconv
 path
-internal/godebug
 vendor/golang.org/x/net/dns/dnsmessage
-syscall
 math/rand/v2
+strconv
+internal/bisect
+io
+internal/testlog
+syscall
+internal/singleflight
+unique
+runtime/cgo
+internal/godebug
 hash
-crypto/internal/fips140deps/godebug
 bytes
-crypto
-math/rand
-net/netip
-crypto/internal/randutil
 strings
-reflect
+crypto/internal/randutil
+crypto/internal/fips140deps/godebug
+crypto
 encoding/base32
+crypto/internal/fips140
 hash/crc32
 vendor/golang.org/x/text/transform
-crypto/internal/fips140
-crypto/internal/impl
+math/rand
+reflect
+net/netip
+crypto/internal/fips140/sha3
 bufio
 net/http/internal/ascii
+crypto/internal/impl
+crypto/tls/internal/fips140tls
 crypto/internal/fips140/sha256
-crypto/internal/fips140/sha3
 crypto/internal/fips140/sha512
-crypto/tls/internal/fips140tls
 crypto/sha3
 time
 internal/syscall/unix
 internal/syscall/execenv
-crypto/internal/fips140hash
 crypto/internal/fips140/hmac
+crypto/internal/fips140hash
 crypto/internal/fips140/check
-crypto/internal/fips140/aes
 crypto/internal/fips140/nistec/fiat
-crypto/internal/fips140/edwards25519/field
 crypto/internal/fips140/hkdf
-crypto/internal/fips140/tls12
 crypto/internal/fips140/bigmod
+crypto/internal/fips140/aes
+crypto/internal/fips140/edwards25519/field
+crypto/internal/fips140/tls12
 crypto/internal/fips140/tls13
 crypto/internal/fips140/edwards25519
 context
-internal/poll
 io/fs
-internal/filepathlite
+internal/poll
 crypto/internal/fips140/nistec
+internal/filepathlite
 os
 internal/fmtsort
 encoding/binary
@@ -483,57 +519,57 @@
 crypto/internal/sysrand
 fmt
 path/filepath
-net
 crypto/internal/entropy
 crypto/internal/fips140/drbg
 crypto/internal/fips140/aes/gcm
 crypto/internal/fips140only
-crypto/internal/fips140/ecdh
 crypto/internal/fips140/ecdsa
 crypto/internal/fips140/ed25519
+crypto/internal/fips140/ecdh
 crypto/internal/fips140/mlkem
 crypto/internal/fips140/rsa
 crypto/md5
 crypto/rc4
+net
 crypto/cipher
-crypto/internal/boring
-crypto/des
-vendor/golang.org/x/crypto/chacha20
 encoding/hex
 net/url
-math/big
+vendor/golang.org/x/net/http2/hpack
 log
+mime
 golang.org/x/net/bpf
 vendor/golang.org/x/text/unicode/norm
+math/big
 compress/flate
+crypto/internal/boring
+crypto/des
 crypto/ecdh
 crypto/sha512
 crypto/sha256
 crypto/aes
 crypto/hmac
+vendor/golang.org/x/crypto/chacha20
 crypto/sha1
-vendor/golang.org/x/crypto/chacha20poly1305
-vendor/golang.org/x/net/http2/hpack
 vendor/golang.org/x/text/unicode/bidi
-mime
 mime/quotedprintable
+compress/gzip
 net/http/internal
+vendor/golang.org/x/crypto/chacha20poly1305
 vendor/golang.org/x/text/secure/bidirule
-compress/gzip
 vendor/golang.org/x/net/idna
-crypto/elliptic
 crypto/internal/boring/bbig
 crypto/rand
-encoding/asn1
 crypto/dsa
+encoding/asn1
+crypto/elliptic
 crypto/ed25519
 crypto/internal/hpke
 crypto/rsa
-vendor/golang.org/x/crypto/cryptobyte
 crypto/x509/pkix
+vendor/golang.org/x/crypto/cryptobyte
 crypto/ecdsa
-net/textproto
 vendor/golang.org/x/net/http/httpproxy
+net/textproto
 crypto/x509
 golang.org/x/net/internal/socket
 vendor/golang.org/x/net/http/httpguts
@@ -574,12 +610,14 @@
 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/1370130/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1370130/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/225879 and its subdirectories
-I: Current time: Fri Feb 21 23:44:54 -12 2025
-I: pbuilder-time-stamp: 1740224694
+I: removing directory /srv/workspace/pbuilder/1370130 and its subdirectories
+I: Current time: Sat Mar 28 08:08:49 +14 2026
+I: pbuilder-time-stamp: 1774634929