Diff of the two buildlogs:

--
--- b1/build.log	2024-04-09 00:29:49.025932912 +0000
+++ b2/build.log	2024-04-09 00:32:34.942879116 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Apr  8 12:26:59 -12 2024
-I: pbuilder-time-stamp: 1712622419
+I: Current time: Tue Apr  9 14:29:58 +14 2024
+I: pbuilder-time-stamp: 1712622598
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking golang-github-google-jsonapi_1.0.0-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1843/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/18680/tmp/hooks/D01_modify_environment starting
+debug: Running on virt32c.
+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 Apr  9 00:30 /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/18680/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/18680/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='armhf'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=3 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='armhf'
+  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]="arm-unknown-linux-gnueabihf")
+  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=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=4 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='01142c7d552b47b1924f5d0d9417122e'
-  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='1843'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=17cca847ebed45c7831323e89e75ff2c
+  LANG=C
+  LANGUAGE=it_CH:it
+  LC_ALL=C
+  MACHTYPE=arm-unknown-linux-gnueabihf
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnueabihf
+  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=18680
   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.4K2ZlGOt/pbuilderrc_sEx8 --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.4K2ZlGOt/b1 --logfile b1/build.log golang-github-google-jsonapi_1.0.0-1.dsc'
-  SUDO_GID='113'
-  SUDO_UID='107'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://10.0.0.15:3142/'
+  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.4K2ZlGOt/pbuilderrc_exJ5 --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.4K2ZlGOt/b2 --logfile b2/build.log golang-github-google-jsonapi_1.0.0-1.dsc'
+  SUDO_GID=113
+  SUDO_UID=107
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://10.0.0.15:3142/
 I: uname -a
-  Linux virt64c 6.1.0-18-arm64 #1 SMP Debian 6.1.76-1 (2024-02-01) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-18-armmp-lpae #1 SMP Debian 6.1.76-1 (2024-02-01) armv7l GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Apr  7 11:25 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1843/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr  6 11:24 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/18680/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -146,7 +178,7 @@
 Get: 34 http://deb.debian.org/debian trixie/main armhf golang-src all 2:1.22~3 [5020 B]
 Get: 35 http://deb.debian.org/debian trixie/main armhf golang-go armhf 2:1.22~3 [44.2 kB]
 Get: 36 http://deb.debian.org/debian trixie/main armhf golang-any armhf 2:1.22~3 [5104 B]
-Fetched 58.7 MB in 1s (48.8 MB/s)
+Fetched 58.7 MB in 1s (52.0 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 ... 19636 files and directories currently installed.)
@@ -305,7 +337,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-google-jsonapi-1.0.0/ && 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-google-jsonapi_1.0.0-1_source.changes
+I: user script /srv/workspace/pbuilder/18680/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/18680/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-google-jsonapi-1.0.0/ && 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-google-jsonapi_1.0.0-1_source.changes
 dpkg-buildpackage: info: source package golang-github-google-jsonapi
 dpkg-buildpackage: info: source version 1.0.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -323,17 +359,17 @@
    dh_autoreconf -O--buildsystem=golang
    dh_auto_configure -O--buildsystem=golang
    dh_auto_build -O--buildsystem=golang
-	cd obj-arm-linux-gnueabihf && go install -trimpath -v -p 3 github.com/google/jsonapi github.com/google/jsonapi/examples
+	cd obj-arm-linux-gnueabihf && go install -trimpath -v -p 4 github.com/google/jsonapi github.com/google/jsonapi/examples
 internal/unsafeheader
 internal/goarch
 internal/cpu
 internal/coverage/rtcov
-internal/abi
 internal/chacha8rand
-internal/bytealg
+internal/abi
 internal/godebugs
 internal/goexperiment
 internal/goos
+internal/bytealg
 runtime/internal/atomic
 runtime/internal/math
 runtime/internal/sys
@@ -341,15 +377,15 @@
 internal/race
 sync/atomic
 unicode
-runtime
 unicode/utf8
 math/bits
-math
 crypto/internal/alias
 internal/itoa
 crypto/internal/boring/sig
+math
 cmp
 slices
+runtime
 encoding
 unicode/utf16
 container/list
@@ -357,99 +393,99 @@
 internal/nettrace
 vendor/golang.org/x/crypto/internal/alias
 log/internal
-crypto/subtle
 internal/reflectlite
+crypto/subtle
 sync
-internal/bisect
 internal/testlog
+internal/bisect
 internal/singleflight
 runtime/cgo
-internal/godebug
 errors
-io
+internal/godebug
 sort
+io
+strconv
 bytes
 hash
-strconv
 crypto/internal/randutil
 internal/oserror
 syscall
+internal/safefilepath
+path
 crypto
 reflect
+math/rand
+strings
+bufio
+hash/crc32
 internal/syscall/unix
 time
-internal/safefilepath
 internal/syscall/execenv
-path
-math/rand
-strings
-encoding/binary
-crypto/cipher
-internal/fmtsort
+crypto/internal/nistec/fiat
+crypto/rc4
+vendor/golang.org/x/net/dns/dnsmessage
 internal/poll
-crypto/internal/boring
 io/fs
-encoding/base64
-bufio
-hash/crc32
-os
+encoding/binary
+internal/fmtsort
 context
+crypto/cipher
+os
+encoding/base64
+crypto/internal/boring
 crypto/aes
 crypto/des
 crypto/internal/edwards25519/field
-crypto/internal/nistec/fiat
 crypto/sha512
-fmt
-io/ioutil
-crypto/internal/edwards25519
 crypto/hmac
-crypto/md5
-math/big
-encoding/json
-compress/flate
+crypto/internal/edwards25519
 crypto/internal/nistec
-compress/gzip
-crypto/rc4
+crypto/md5
 crypto/sha1
-crypto/rand
-github.com/google/jsonapi
-crypto/internal/bigmod
-crypto/internal/boring/bbig
-encoding/asn1
-crypto/ecdh
-crypto/elliptic
-crypto/ed25519
-crypto/rsa
-vendor/golang.org/x/crypto/cryptobyte
+fmt
+io/ioutil
 crypto/sha256
-crypto/dsa
-encoding/hex
 encoding/pem
-crypto/x509/pkix
-vendor/golang.org/x/net/dns/dnsmessage
 internal/intern
-crypto/ecdsa
-net/netip
-net/url
 path/filepath
-net
+crypto/ecdh
+net/netip
 vendor/golang.org/x/crypto/chacha20
 vendor/golang.org/x/crypto/internal/poly1305
 vendor/golang.org/x/crypto/hkdf
-vendor/golang.org/x/text/transform
 vendor/golang.org/x/crypto/chacha20poly1305
+vendor/golang.org/x/text/transform
+encoding/json
+math/big
+compress/flate
+encoding/hex
+net
+compress/gzip
+net/url
 log
 vendor/golang.org/x/text/unicode/norm
 vendor/golang.org/x/text/unicode/bidi
+crypto/rand
+crypto/elliptic
+github.com/google/jsonapi
+crypto/internal/bigmod
+crypto/internal/boring/bbig
+encoding/asn1
+crypto/ed25519
+crypto/rsa
+crypto/dsa
 vendor/golang.org/x/text/secure/bidirule
-vendor/golang.org/x/net/http2/hpack
 vendor/golang.org/x/net/idna
+vendor/golang.org/x/net/http2/hpack
+vendor/golang.org/x/crypto/cryptobyte
+crypto/x509/pkix
+crypto/ecdsa
 mime
 mime/quotedprintable
 net/http/internal
 net/http/internal/ascii
-net/http/internal/testcert
 flag
+net/http/internal/testcert
 vendor/golang.org/x/net/http/httpproxy
 net/textproto
 crypto/x509
@@ -461,7 +497,7 @@
 net/http/httptest
 github.com/google/jsonapi/examples
    dh_auto_test -O--buildsystem=golang
-	cd obj-arm-linux-gnueabihf && go test -vet=off -v -p 3 github.com/google/jsonapi github.com/google/jsonapi/examples
+	cd obj-arm-linux-gnueabihf && go test -vet=off -v -p 4 github.com/google/jsonapi github.com/google/jsonapi/examples
 === RUN   TestErrorObjectWritesExpectedErrorMessage
 --- PASS: TestErrorObjectWritesExpectedErrorMessage (0.00s)
 === RUN   TestMarshalErrorsWritesTheExpectedPayload
@@ -545,7 +581,7 @@
 === RUN   TestUnmarshalRelationshipsSerializedEmbedded
 --- PASS: TestUnmarshalRelationshipsSerializedEmbedded (0.00s)
 === RUN   TestUnmarshalNestedRelationshipsEmbedded
---- PASS: TestUnmarshalNestedRelationshipsEmbedded (0.00s)
+--- PASS: TestUnmarshalNestedRelationshipsEmbedded (0.01s)
 === RUN   TestUnmarshalRelationshipsSideloaded
 --- PASS: TestUnmarshalRelationshipsSideloaded (0.00s)
 === RUN   TestUnmarshalNestedRelationshipsSideloaded
@@ -621,7 +657,7 @@
 === RUN   TestMarshalPayloadWithoutIncluded
 --- PASS: TestMarshalPayloadWithoutIncluded (0.00s)
 === RUN   TestMarshalPayload_many
---- PASS: TestMarshalPayload_many (0.00s)
+--- PASS: TestMarshalPayload_many (0.01s)
 === RUN   TestMarshalMany_WithSliceOfStructPointers
 --- PASS: TestMarshalMany_WithSliceOfStructPointers (0.00s)
 === RUN   TestMarshalManyWithoutIncluded
@@ -631,7 +667,7 @@
 === RUN   TestMarshal_InvalidIntefaceArgument
 --- PASS: TestMarshal_InvalidIntefaceArgument (0.00s)
 PASS
-ok  	github.com/google/jsonapi	0.035s
+ok  	github.com/google/jsonapi	0.084s
 === RUN   TestExampleHandler_post
 --- PASS: TestExampleHandler_post (0.00s)
 === RUN   TestExampleHandler_put
@@ -645,7 +681,7 @@
 === RUN   TestHttpErrorWhenMethodDoesNotMatch
 --- PASS: TestHttpErrorWhenMethodDoesNotMatch (0.00s)
 PASS
-ok  	github.com/google/jsonapi/examples	0.016s
+ok  	github.com/google/jsonapi/examples	0.022s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=golang
    dh_prep -O--buildsystem=golang
@@ -676,12 +712,14 @@
 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/18680/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/18680/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/1843 and its subdirectories
-I: Current time: Mon Apr  8 12:29:44 -12 2024
-I: pbuilder-time-stamp: 1712622584
+I: removing directory /srv/workspace/pbuilder/18680 and its subdirectories
+I: Current time: Tue Apr  9 14:32:30 +14 2024
+I: pbuilder-time-stamp: 1712622750