Diff of the two buildlogs:

--
--- b1/build.log	2023-04-11 04:03:20.445213731 +0000
+++ b2/build.log	2023-04-11 04:06:22.783137527 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun May 12 22:24:02 -12 2024
-I: pbuilder-time-stamp: 1715595842
+I: Current time: Tue Apr 11 18:03:24 +14 2023
+I: pbuilder-time-stamp: 1681185804
 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-svanharmelen-jsonapi_1.0.0+git20180618.0c0828c.orig.tar.xz]
 I: copying [./golang-github-svanharmelen-jsonapi_1.0.0+git20180618.0c0828c-4.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Wed Dec  7 23:15:55 2022 -12
+gpgv: Signature made Fri Dec  9 01:15:55 2022 +14
 gpgv:                using RSA key B23862C415D6565A4E86CBD7579C160D4C9E23E8
 gpgv: Can't check signature: No public key
 dpkg-source: warning: cannot verify inline signature for ./golang-github-svanharmelen-jsonapi_1.0.0+git20180618.0c0828c-4.dsc: no acceptable signature found
@@ -25,11 +25,20 @@
 dpkg-source: info: unpacking golang-github-svanharmelen-jsonapi_1.0.0+git20180618.0c0828c-4.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/23692/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/29092/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink16-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
+lrwxrwxrwx 1 root root 4 Jan  6 03:20 /bin/sh -> dash
+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/29092/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/29092/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'
+  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'
@@ -39,38 +48,38 @@
   IFS=' 	
   '
   LANG='C'
-  LANGUAGE='en_US:en'
+  LANGUAGE='nl_BE:nl'
   LC_ALL='C'
   MAIL='/var/mail/root'
   OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
+  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'
-  PPID='23692'
+  PPID='29092'
   PS1='# '
   PS2='> '
   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.YAI1UpDB/pbuilderrc_njBW --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.YAI1UpDB/b1 --logfile b1/build.log golang-github-svanharmelen-jsonapi_1.0.0+git20180618.0c0828c-4.dsc'
+  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.YAI1UpDB/pbuilderrc_Vawy --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.YAI1UpDB/b2 --logfile b2/build.log --extrapackages usrmerge golang-github-svanharmelen-jsonapi_1.0.0+git20180618.0c0828c-4.dsc'
   SUDO_GID='117'
   SUDO_UID='110'
   SUDO_USER='jenkins'
   TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
+  TZ='/usr/share/zoneinfo/Etc/GMT-14'
   USER='root'
   USERNAME='root'
   _='/usr/bin/systemd-run'
   http_proxy='http://192.168.101.16:3128'
 I: uname -a
-  Linux codethink15-arm64 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 12 04:47 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/23692/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr  9 00:25 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/29092/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -149,7 +158,7 @@
 Get: 35 http://deb.debian.org/debian bookworm/main arm64 golang-go arm64 2:1.19~1 [45.0 kB]
 Get: 36 http://deb.debian.org/debian bookworm/main arm64 golang-any arm64 2:1.19~1 [5876 B]
 Get: 37 http://deb.debian.org/debian bookworm/main arm64 golang-github-google-jsonapi-dev all 1.0.0-1 [24.9 kB]
-Fetched 93.3 MB in 2s (41.4 MB/s)
+Fetched 93.3 MB in 2s (54.7 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.)
@@ -314,10 +323,15 @@
 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-svanharmelen-jsonapi-1.0.0+git20180618.0c0828c/ && 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-svanharmelen-jsonapi_1.0.0+git20180618.0c0828c-4_source.changes
+I: user script /srv/workspace/pbuilder/29092/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/29092/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/golang-github-svanharmelen-jsonapi-1.0.0+git20180618.0c0828c/ && 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-svanharmelen-jsonapi_1.0.0+git20180618.0c0828c-4_source.changes
 dpkg-buildpackage: info: source package golang-github-svanharmelen-jsonapi
 dpkg-buildpackage: info: source version 1.0.0+git20180618.0c0828c-4
 dpkg-buildpackage: info: source distribution unstable
@@ -338,48 +352,48 @@
 	cd obj-aarch64-linux-gnu && go install -trimpath -v -p 8 github.com/svanharmelen/jsonapi github.com/svanharmelen/jsonapi/examples
 internal/goarch
 internal/unsafeheader
-internal/goexperiment
-internal/goos
 internal/race
-internal/cpu
+internal/goos
+internal/goexperiment
+runtime/internal/syscall
 internal/abi
-unicode
+internal/cpu
 runtime/internal/math
 sync/atomic
-runtime/internal/syscall
-runtime/internal/sys
 unicode/utf8
+runtime/internal/sys
+unicode
 math/bits
 crypto/internal/subtle
 crypto/subtle
 internal/itoa
 crypto/internal/boring/sig
 encoding
-math
+runtime/internal/atomic
+internal/bytealg
 unicode/utf16
 container/list
 vendor/golang.org/x/crypto/cryptobyte/asn1
-internal/bytealg
-runtime/internal/atomic
 internal/nettrace
+math
 vendor/golang.org/x/crypto/internal/subtle
 runtime
 internal/reflectlite
 sync
-math/rand
-internal/singleflight
 internal/testlog
+internal/singleflight
+math/rand
 runtime/cgo
 errors
 sort
-strconv
+io
 internal/oserror
 internal/safefilepath
 path
-io
+strconv
 crypto/internal/nistec/fiat
-syscall
 vendor/golang.org/x/net/dns/dnsmessage
+syscall
 bytes
 hash
 crypto/internal/randutil
@@ -389,76 +403,76 @@
 reflect
 crypto/rc4
 vendor/golang.org/x/text/transform
-net/http/internal/ascii
 bufio
+net/http/internal/ascii
 net/http/internal/testcert
 internal/syscall/unix
-internal/syscall/execenv
 time
+internal/syscall/execenv
 internal/poll
-context
 io/fs
+context
 embed
+os
 encoding/binary
 internal/fmtsort
-os
+fmt
+io/ioutil
+internal/godebug
+path/filepath
 crypto/cipher
 encoding/base64
-crypto/md5
 crypto/internal/edwards25519/field
-vendor/golang.org/x/crypto/internal/poly1305
-vendor/golang.org/x/crypto/curve25519/internal/field
 crypto/internal/nistec
+crypto/md5
+internal/intern
+net/netip
 encoding/pem
-crypto/internal/edwards25519
-crypto/internal/boring
+vendor/golang.org/x/crypto/internal/poly1305
 crypto/des
-vendor/golang.org/x/crypto/chacha20
+crypto/internal/boring
+crypto/internal/edwards25519
 crypto/aes
 crypto/sha512
 crypto/hmac
 crypto/sha1
 crypto/sha256
-fmt
-io/ioutil
-internal/godebug
-path/filepath
-internal/intern
-vendor/golang.org/x/crypto/chacha20poly1305
+vendor/golang.org/x/crypto/chacha20
+vendor/golang.org/x/crypto/curve25519/internal/field
 vendor/golang.org/x/crypto/hkdf
-net/netip
 net
+vendor/golang.org/x/crypto/chacha20poly1305
+encoding/json
 compress/flate
+net/url
 encoding/hex
-vendor/golang.org/x/crypto/curve25519
 log
 math/big
-encoding/json
-net/url
+vendor/golang.org/x/crypto/curve25519
 vendor/golang.org/x/text/unicode/norm
 vendor/golang.org/x/net/http2/hpack
 vendor/golang.org/x/text/unicode/bidi
 mime
-compress/gzip
 mime/quotedprintable
+compress/gzip
 net/http/internal
 flag
 vendor/golang.org/x/text/secure/bidirule
 vendor/golang.org/x/net/idna
 crypto/rand
 crypto/elliptic
-crypto/internal/boring/bbig
-crypto/dsa
 encoding/asn1
+crypto/dsa
+crypto/internal/boring/bbig
 github.com/svanharmelen/jsonapi
-github.com/google/jsonapi
 crypto/ed25519
+github.com/google/jsonapi
 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
 vendor/golang.org/x/net/http/httpguts
 mime/multipart
@@ -516,7 +530,7 @@
 === RUN   TestUnmarshal_nonNumericID
 --- PASS: TestUnmarshal_nonNumericID (0.00s)
 === RUN   TestUnmarshalSetsAttrs
---- PASS: TestUnmarshalSetsAttrs (0.00s)
+--- PASS: TestUnmarshalSetsAttrs (0.01s)
 === RUN   TestUnmarshalParsesISO8601
 --- PASS: TestUnmarshalParsesISO8601 (0.00s)
 === RUN   TestUnmarshalParsesISO8601TimePointer
@@ -538,7 +552,7 @@
 === RUN   TestUnmarshalNestedRelationshipsEmbedded
 --- PASS: TestUnmarshalNestedRelationshipsEmbedded (0.00s)
 === RUN   TestUnmarshalRelationshipsSideloaded
---- PASS: TestUnmarshalRelationshipsSideloaded (0.00s)
+--- PASS: TestUnmarshalRelationshipsSideloaded (0.01s)
 === RUN   TestUnmarshalNestedRelationshipsSideloaded
 --- PASS: TestUnmarshalNestedRelationshipsSideloaded (0.00s)
 === RUN   TestUnmarshalNestedRelationshipsEmbedded_withClientIDs
@@ -552,7 +566,7 @@
 === RUN   TestUnmarshalNestedStructPtr
 --- PASS: TestUnmarshalNestedStructPtr (0.00s)
 === RUN   TestUnmarshalNestedStruct
---- PASS: TestUnmarshalNestedStruct (0.00s)
+--- PASS: TestUnmarshalNestedStruct (0.01s)
 === RUN   TestUnmarshalNestedStructSlice
 --- PASS: TestUnmarshalNestedStructSlice (0.00s)
 === RUN   TestMarshalPayload
@@ -602,7 +616,7 @@
 === RUN   TestMarshalPayload_many
 --- PASS: TestMarshalPayload_many (0.00s)
 === RUN   TestMarshalMany_WithSliceOfStructPointers
---- PASS: TestMarshalMany_WithSliceOfStructPointers (0.01s)
+--- PASS: TestMarshalMany_WithSliceOfStructPointers (0.00s)
 === RUN   TestMarshalManyWithoutIncluded
 --- PASS: TestMarshalManyWithoutIncluded (0.00s)
 === RUN   TestMarshalMany_SliceOfInterfaceAndSliceOfStructsSameJSON
@@ -610,7 +624,7 @@
 === RUN   TestMarshal_InvalidIntefaceArgument
 --- PASS: TestMarshal_InvalidIntefaceArgument (0.00s)
 PASS
-ok  	github.com/svanharmelen/jsonapi	0.046s
+ok  	github.com/svanharmelen/jsonapi	0.068s
 === RUN   TestExampleHandler_post
 --- PASS: TestExampleHandler_post (0.00s)
 === RUN   TestExampleHandler_put
@@ -660,12 +674,14 @@
 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/29092/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/29092/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/23692 and its subdirectories
-I: Current time: Sun May 12 22:26:19 -12 2024
-I: pbuilder-time-stamp: 1715595979
+I: removing directory /srv/workspace/pbuilder/29092 and its subdirectories
+I: Current time: Tue Apr 11 18:06:21 +14 2023
+I: pbuilder-time-stamp: 1681185981