Diff of the two buildlogs:

--
--- b1/build.log	2023-05-12 16:09:27.742967442 +0000
+++ b2/build.log	2023-05-12 16:12:17.871517221 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Jun 13 10:30:52 -12 2024
-I: pbuilder-time-stamp: 1718317852
+I: Current time: Sat May 13 06:09:31 +14 2023
+I: pbuilder-time-stamp: 1683907771
 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-nytimes-gziphandler_1.1.1.orig.tar.xz]
 I: copying [./golang-github-nytimes-gziphandler_1.1.1-1.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Mon Dec  2 10:19:50 2019 -12
+gpgv: Signature made Tue Dec  3 12:19:50 2019 +14
 gpgv:                using RSA key 50BC7CF939D20C272A6B065652B6BBD953968D1B
 gpgv: Can't check signature: No public key
 dpkg-source: warning: cannot verify inline signature for ./golang-github-nytimes-gziphandler_1.1.1-1.dsc: no acceptable signature found
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking golang-github-nytimes-gziphandler_1.1.1-1.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/30936/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/10279/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink14-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 May 13 06:09 /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/10279/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/10279/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='30936'
-  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=10279
   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.CxhRAe5A/pbuilderrc_n99n --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.CxhRAe5A/b1 --logfile b1/build.log golang-github-nytimes-gziphandler_1.1.1-1.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.CxhRAe5A/pbuilderrc_7VFr --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.CxhRAe5A/b2 --logfile b2/build.log --extrapackages usrmerge golang-github-nytimes-gziphandler_1.1.1-1.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 codethink11-arm64 4.15.0-210-generic #221-Ubuntu SMP Tue Apr 18 08:32:48 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-210-generic #221-Ubuntu SMP Tue Apr 18 08:32:48 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Jun 11 04:47 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/30936/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 11 00:25 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/10279/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -152,7 +184,7 @@
 Get: 38 http://deb.debian.org/debian bookworm/main arm64 golang-github-stretchr-testify-dev all 1.8.1-1 [67.9 kB]
 Get: 39 http://deb.debian.org/debian bookworm/main arm64 golang-src all 2:1.19~1 [5756 B]
 Get: 40 http://deb.debian.org/debian bookworm/main arm64 golang-go arm64 2:1.19~1 [45.0 kB]
-Fetched 93.5 MB in 2s (61.0 MB/s)
+Fetched 93.5 MB in 2s (57.0 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sensible-utils.
 (Reading database ... 
(Reading database ... 5%
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(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.)
@@ -329,10 +361,15 @@
 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-nytimes-gziphandler-1.1.1/ && 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-nytimes-gziphandler_1.1.1-1_source.changes
+I: user script /srv/workspace/pbuilder/10279/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/10279/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/golang-github-nytimes-gziphandler-1.1.1/ && 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-nytimes-gziphandler_1.1.1-1_source.changes
 dpkg-buildpackage: info: source package golang-github-nytimes-gziphandler
 dpkg-buildpackage: info: source version 1.1.1-1
 dpkg-buildpackage: info: source distribution unstable
@@ -352,19 +389,19 @@
    dh_auto_build -O--buildsystem=golang
 	cd obj-aarch64-linux-gnu && go install -trimpath -v -p 8 github.com/NYTimes/gziphandler
 internal/unsafeheader
-internal/goexperiment
 internal/goarch
+internal/goexperiment
 internal/goos
-unicode
-internal/cpu
-internal/race
 runtime/internal/syscall
+internal/race
 sync/atomic
-unicode/utf8
-internal/itoa
+internal/cpu
 internal/abi
 runtime/internal/math
+unicode
 runtime/internal/sys
+unicode/utf8
+internal/itoa
 math/bits
 internal/nettrace
 container/list
@@ -372,31 +409,31 @@
 crypto/subtle
 crypto/internal/boring/sig
 unicode/utf16
-internal/bytealg
-runtime/internal/atomic
 vendor/golang.org/x/crypto/cryptobyte/asn1
 math
+internal/bytealg
+runtime/internal/atomic
 vendor/golang.org/x/crypto/internal/subtle
 runtime
 sync
 internal/reflectlite
-internal/singleflight
 internal/testlog
+internal/singleflight
 math/rand
 runtime/cgo
 errors
 sort
 io
-internal/oserror
 strconv
+path
 internal/safefilepath
+internal/oserror
 vendor/golang.org/x/net/dns/dnsmessage
-path
 syscall
 crypto/internal/nistec/fiat
 bytes
-strings
 hash
+strings
 hash/crc32
 crypto/internal/randutil
 crypto
@@ -405,48 +442,48 @@
 vendor/golang.org/x/text/transform
 bufio
 net/http/internal/ascii
-internal/syscall/execenv
 internal/syscall/unix
 time
-context
+internal/syscall/execenv
 io/fs
+context
 internal/poll
 embed
+os
 internal/fmtsort
 encoding/binary
-os
-encoding/base64
-crypto/cipher
 crypto/internal/edwards25519/field
+encoding/base64
+crypto/internal/nistec
 crypto/md5
 vendor/golang.org/x/crypto/internal/poly1305
+crypto/cipher
 vendor/golang.org/x/crypto/curve25519/internal/field
-crypto/internal/nistec
+fmt
+internal/godebug
 encoding/pem
+path/filepath
+internal/intern
+net/netip
+crypto/internal/edwards25519
 crypto/internal/boring
 crypto/des
 vendor/golang.org/x/crypto/chacha20
-crypto/internal/edwards25519
+crypto/aes
 crypto/sha512
 crypto/hmac
-crypto/aes
 crypto/sha1
 crypto/sha256
-fmt
-internal/godebug
-path/filepath
-internal/intern
 vendor/golang.org/x/crypto/chacha20poly1305
 vendor/golang.org/x/crypto/hkdf
-net/netip
 net
 mime
 compress/flate
 encoding/hex
-vendor/golang.org/x/crypto/curve25519
 net/url
-log
+vendor/golang.org/x/crypto/curve25519
 math/big
+log
 vendor/golang.org/x/text/unicode/norm
 vendor/golang.org/x/net/http2/hpack
 vendor/golang.org/x/text/unicode/bidi
@@ -455,15 +492,15 @@
 compress/gzip
 vendor/golang.org/x/text/secure/bidirule
 vendor/golang.org/x/net/idna
-crypto/internal/boring/bbig
 crypto/rand
+crypto/elliptic
+crypto/internal/boring/bbig
 encoding/asn1
 crypto/dsa
-crypto/elliptic
 crypto/ed25519
 crypto/rsa
-crypto/x509/pkix
 vendor/golang.org/x/crypto/cryptobyte
+crypto/x509/pkix
 crypto/ecdsa
 vendor/golang.org/x/net/http/httpproxy
 net/textproto
@@ -489,7 +526,7 @@
 === RUN   TestGzipHandlerAlreadyCompressed
 --- PASS: TestGzipHandlerAlreadyCompressed (0.00s)
 === RUN   TestNewGzipLevelHandler
---- PASS: TestNewGzipLevelHandler (0.01s)
+--- PASS: TestNewGzipLevelHandler (0.06s)
 === RUN   TestNewGzipLevelHandlerReturnsErrorForInvalidLevels
 --- PASS: TestNewGzipLevelHandlerReturnsErrorForInvalidLevels (0.00s)
 === RUN   TestMustNewGzipLevelHandlerWillPanic
@@ -509,7 +546,7 @@
 === RUN   TestStatusCodes
 --- PASS: TestStatusCodes (0.00s)
 === RUN   TestFlushBeforeWrite
---- PASS: TestFlushBeforeWrite (0.00s)
+--- PASS: TestFlushBeforeWrite (0.01s)
 === RUN   TestImplementCloseNotifier
 --- PASS: TestImplementCloseNotifier (0.00s)
 === RUN   TestImplementFlusherAndCloseNotifier
@@ -523,7 +560,7 @@
 === RUN   TestContentTypes
 --- PASS: TestContentTypes (0.00s)
 PASS
-ok  	github.com/NYTimes/gziphandler	0.030s
+ok  	github.com/NYTimes/gziphandler	0.160s
    create-stamp debian/debhelper-build-stamp
  fakeroot debian/rules binary
 dh binary --buildsystem=golang --with=golang
@@ -554,12 +591,14 @@
 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/10279/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/10279/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/30936 and its subdirectories
-I: Current time: Thu Jun 13 10:32:26 -12 2024
-I: pbuilder-time-stamp: 1718317946
+I: removing directory /srv/workspace/pbuilder/10279 and its subdirectories
+I: Current time: Sat May 13 06:12:16 +14 2023
+I: pbuilder-time-stamp: 1683907936