Diff of the two buildlogs:

--
--- b1/build.log	2023-04-10 19:55:12.294187748 +0000
+++ b2/build.log	2023-04-10 19:57:49.668921583 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Apr 10 07:52:42 -12 2023
-I: pbuilder-time-stamp: 1681156362
+I: Current time: Mon May 13 16:18:16 +14 2024
+I: pbuilder-time-stamp: 1715566696
 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-pion-stun_0.4.0.orig.tar.gz]
 I: copying [./golang-github-pion-stun_0.4.0-1.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Fri Feb 24 22:48:51 2023 -12
+gpgv: Signature made Sun Feb 26 00:48:51 2023 +14
 gpgv:                using EDDSA key A095B66EE09024BEE6A2F0722A27904BD7243EDA
 gpgv: Can't check signature: No public key
 dpkg-source: warning: cannot verify inline signature for ./golang-github-pion-stun_0.4.0-1.dsc: no acceptable signature found
@@ -25,11 +25,20 @@
 dpkg-source: info: unpacking golang-github-pion-stun_0.4.0-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/4842/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2649/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink15-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  2023 /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/2649/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2649/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='4842'
+  PPID='2649'
   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.syGgoWeF/pbuilderrc_Md1R --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.syGgoWeF/b1 --logfile b1/build.log golang-github-pion-stun_0.4.0-1.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.syGgoWeF/pbuilderrc_J91w --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.syGgoWeF/b2 --logfile b2/build.log --extrapackages usrmerge golang-github-pion-stun_0.4.0-1.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 codethink10-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 Apr  7 22:25 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/4842/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 13 06:47 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2649/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -153,7 +162,7 @@
 Get: 39 http://deb.debian.org/debian bookworm/main arm64 golang-golang-x-text-dev all 0.7.0-1 [3863 kB]
 Get: 40 http://deb.debian.org/debian bookworm/main arm64 golang-golang-x-net-dev all 1:0.7.0+dfsg-1 [731 kB]
 Get: 41 http://deb.debian.org/debian bookworm/main arm64 golang-github-pion-transport-dev all 2.0.2-1 [57.6 kB]
-Fetched 98.4 MB in 2s (47.5 MB/s)
+Fetched 98.4 MB in 4s (22.6 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.)
@@ -331,8 +340,17 @@
 Writing extended state information...
 Building tag database...
  -> Finished parsing the build-deps
+Reading package lists...
+Building dependency tree...
+Reading state information...
+usrmerge is already the newest version (35).
+0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/golang-github-pion-stun-0.4.0/ && 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-pion-stun_0.4.0-1_source.changes
+I: user script /srv/workspace/pbuilder/2649/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/2649/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/golang-github-pion-stun-0.4.0/ && 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-pion-stun_0.4.0-1_source.changes
 dpkg-buildpackage: info: source package golang-github-pion-stun
 dpkg-buildpackage: info: source version 0.4.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -351,16 +369,16 @@
    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 8 github.com/pion/stun github.com/pion/stun/cmd/stun-bench github.com/pion/stun/cmd/stun-client github.com/pion/stun/cmd/stun-decode github.com/pion/stun/cmd/stun-multiplex github.com/pion/stun/cmd/stun-nat-behaviour github.com/pion/stun/cmd/stun-traversal github.com/pion/stun/e2e github.com/pion/stun/internal/hmac github.com/pion/stun/internal/testutil github.com/pion/stun/stuntest
-internal/goarch
 internal/goexperiment
-internal/goos
 internal/unsafeheader
+internal/goarch
+internal/goos
 internal/race
 internal/cpu
-math/bits
 sync/atomic
-runtime/internal/syscall
+math/bits
 unicode/utf8
+runtime/internal/syscall
 internal/itoa
 internal/abi
 runtime/internal/math
@@ -368,29 +386,29 @@
 unicode
 crypto/internal/subtle
 crypto/subtle
-math
-github.com/pion/transport/utils/xor
 crypto/internal/boring/sig
+github.com/pion/transport/utils/xor
 internal/nettrace
 encoding
-internal/bytealg
 runtime/internal/atomic
+internal/bytealg
+math
 runtime
-internal/reflectlite
 sync
+internal/reflectlite
 internal/testlog
-math/rand
 internal/singleflight
 internal/sysinfo
+math/rand
 runtime/cgo
 errors
 sort
 io
 internal/oserror
-internal/safefilepath
+strconv
 path
+internal/safefilepath
 vendor/golang.org/x/net/dns/dnsmessage
-strconv
 syscall
 hash
 crypto/internal/randutil
@@ -402,23 +420,23 @@
 reflect
 bufio
 internal/syscall/unix
-internal/syscall/execenv
 time
+internal/syscall/execenv
 internal/poll
-context
 io/fs
+context
 os
 encoding/binary
 internal/fmtsort
+fmt
 internal/godebug
 os/signal
-fmt
 path/filepath
 internal/intern
-net/netip
 crypto/md5
 crypto/cipher
 encoding/base64
+net/netip
 crypto/internal/boring
 crypto/sha1
 crypto/sha256
@@ -426,24 +444,24 @@
 net
 log
 net/url
-math/big
 flag
 compress/flate
 runtime/trace
 runtime/debug
+math/big
 github.com/pion/logging
 testing
 compress/gzip
 runtime/pprof
-crypto/rand
 github.com/pion/stun/internal/testutil
+crypto/rand
 github.com/pion/stun/stuntest
 github.com/pion/stun
-github.com/pion/stun/cmd/stun-bench
 github.com/pion/stun/cmd/stun-client
 github.com/pion/stun/cmd/stun-decode
 github.com/pion/stun/cmd/stun-multiplex
 github.com/pion/stun/cmd/stun-nat-behaviour
+github.com/pion/stun/cmd/stun-bench
 github.com/pion/stun/cmd/stun-traversal
 github.com/pion/stun/e2e
    dh_auto_test -O--builddirectory=_build -O--buildsystem=golang
@@ -501,7 +519,7 @@
 === RUN   TestMessage_GetNoAllocs
 === RUN   TestMessage_GetNoAllocs/Default
 === RUN   TestMessage_GetNoAllocs/Not_found
---- PASS: TestMessage_GetNoAllocs (0.00s)
+--- PASS: TestMessage_GetNoAllocs (0.01s)
     --- PASS: TestMessage_GetNoAllocs/Default (0.00s)
     --- PASS: TestMessage_GetNoAllocs/Not_found (0.00s)
 === RUN   TestPadding
@@ -539,13 +557,13 @@
     client_test.go:173: waiting for read
 --- PASS: TestClient_Start (0.02s)
 === RUN   TestClient_Do
---- PASS: TestClient_Do (0.00s)
+--- PASS: TestClient_Do (0.01s)
 === RUN   TestCloseErr_Error
 --- PASS: TestCloseErr_Error (0.00s)
 === RUN   TestStopErr_Error
 --- PASS: TestStopErr_Error (0.00s)
 === RUN   TestClientAgentError
---- PASS: TestClientAgentError (0.01s)
+--- PASS: TestClientAgentError (0.00s)
 === RUN   TestClientConnErr
 --- PASS: TestClientConnErr (0.00s)
 === RUN   TestClientConnErrStopErr
@@ -563,15 +581,15 @@
 === RUN   TestClientCloseErr
 --- PASS: TestClientCloseErr (0.00s)
 === RUN   TestWithNoConnClose
---- PASS: TestWithNoConnClose (0.00s)
+--- PASS: TestWithNoConnClose (0.01s)
 === RUN   TestClientGC
---- PASS: TestClientGC (0.00s)
+--- PASS: TestClientGC (0.01s)
 === RUN   TestClientCheckInit
 --- PASS: TestClientCheckInit (0.00s)
 === RUN   TestClientFinalizer
 --- PASS: TestClientFinalizer (0.01s)
 === RUN   TestCallbackWaitHandler
---- PASS: TestCallbackWaitHandler (0.27s)
+--- PASS: TestCallbackWaitHandler (0.11s)
 === RUN   TestClientRetransmission
 --- PASS: TestClientRetransmission (0.00s)
 === RUN   TestClient_DoConcurrent
@@ -581,12 +599,12 @@
 === RUN   TestClient_DoConcurrent/25
 === RUN   TestClient_DoConcurrent/100
 === RUN   TestClient_DoConcurrent/500
---- PASS: TestClient_DoConcurrent (0.25s)
+--- PASS: TestClient_DoConcurrent (0.27s)
     --- PASS: TestClient_DoConcurrent/1 (0.01s)
-    --- PASS: TestClient_DoConcurrent/5 (0.02s)
+    --- PASS: TestClient_DoConcurrent/5 (0.03s)
     --- PASS: TestClient_DoConcurrent/10 (0.00s)
     --- PASS: TestClient_DoConcurrent/25 (0.01s)
-    --- PASS: TestClient_DoConcurrent/100 (0.02s)
+    --- PASS: TestClient_DoConcurrent/100 (0.04s)
     --- PASS: TestClient_DoConcurrent/500 (0.19s)
 === RUN   TestNewClient
 === RUN   TestNewClient/SetCallbackError
@@ -601,7 +619,7 @@
 === RUN   TestClientDefaultHandler
 --- PASS: TestClientDefaultHandler (0.00s)
 === RUN   TestClientClosedStart
---- PASS: TestClientClosedStart (0.00s)
+--- PASS: TestClientClosedStart (0.01s)
 === RUN   TestWithNoRetransmit
 --- PASS: TestWithNoRetransmit (0.00s)
 === RUN   TestClientRTOStartErr
@@ -620,7 +638,7 @@
     client_test.go:1133: client closed, unlocking clock
     client_test.go:1135: clock unlocked
     client_test.go:1096: clock returned after waiting
---- PASS: TestClientRTOStartErr (0.35s)
+--- PASS: TestClientRTOStartErr (0.34s)
 === RUN   TestClientRTOWriteErr
     client_test.go:1287: starting
     client_test.go:1204: waiting: false
@@ -638,7 +656,7 @@
     client_test.go:1255: clock unlocked
     client_test.go:1212: clock returned after waiting
     client_test.go:1230: start 1
---- PASS: TestClientRTOWriteErr (0.34s)
+--- PASS: TestClientRTOWriteErr (0.38s)
 === RUN   TestClientRTOAgentErr
     client_test.go:1367: starting
     client_test.go:1335: start 0
@@ -668,19 +686,19 @@
 === RUN   TestHelpersErrorHandling
 === RUN   TestHelpersErrorHandling/MustBuild
 === RUN   TestHelpersErrorHandling/MustBuild/Positive
---- PASS: TestHelpersErrorHandling (0.00s)
-    --- PASS: TestHelpersErrorHandling/MustBuild (0.00s)
+--- PASS: TestHelpersErrorHandling (0.04s)
+    --- PASS: TestHelpersErrorHandling/MustBuild (0.04s)
         --- PASS: TestHelpersErrorHandling/MustBuild/Positive (0.00s)
 === RUN   TestMessage_ForEach
 === RUN   TestMessage_ForEach/NoResults
 === RUN   TestMessage_ForEach/ReturnOnError
 === RUN   TestMessage_ForEach/Positive
 === RUN   TestMessage_ForEach/Positive/ZeroAlloc
---- PASS: TestMessage_ForEach (0.01s)
+--- PASS: TestMessage_ForEach (0.03s)
     --- PASS: TestMessage_ForEach/NoResults (0.00s)
     --- PASS: TestMessage_ForEach/ReturnOnError (0.00s)
-    --- PASS: TestMessage_ForEach/Positive (0.01s)
-        --- PASS: TestMessage_ForEach/Positive/ZeroAlloc (0.01s)
+    --- PASS: TestMessage_ForEach/Positive (0.03s)
+        --- PASS: TestMessage_ForEach/Positive/ZeroAlloc (0.03s)
 === RUN   TestIANA
 === RUN   TestIANA/Methods
     iana_test.go:41: value: 0x0, name: Reserved
@@ -856,9 +874,9 @@
 === RUN   TestMessage_Contains
 --- PASS: TestMessage_Contains (0.00s)
 === RUN   TestAllocations
---- PASS: TestAllocations (0.05s)
+--- PASS: TestAllocations (0.03s)
 === RUN   TestAllocationsGetters
---- PASS: TestAllocationsGetters (0.02s)
+--- PASS: TestAllocationsGetters (0.01s)
 === RUN   TestMessageFullSize
 --- PASS: TestMessageFullSize (0.00s)
 === RUN   TestMessage_CloneTo
@@ -868,9 +886,9 @@
 === RUN   TestDecode
 === RUN   TestDecode/Nil
 === RUN   TestDecode/ZeroAlloc
---- PASS: TestDecode (0.01s)
+--- PASS: TestDecode (0.00s)
     --- PASS: TestDecode/Nil (0.00s)
-    --- PASS: TestDecode/ZeroAlloc (0.01s)
+    --- PASS: TestDecode/ZeroAlloc (0.00s)
 === RUN   TestMessage_MarshalBinary
 --- PASS: TestMessage_MarshalBinary (0.00s)
 === RUN   TestMessage_GobDecode
@@ -985,7 +1003,7 @@
 === RUN   FuzzMessage/9f92a54747b065e4b2df1cc3203e82b43853533fb2c2ae9155f31568235f143e
 === RUN   FuzzMessage/bea9013452ffd1e80cd8c4b372b2149c1bf8c77b81c754a9ba35e0720bda0fba
 === RUN   FuzzMessage/d40a98862ed393eb712e47a91bcef18e6f24cf368bb4bd248c7a7101ef8e178d
---- PASS: FuzzMessage (0.00s)
+--- PASS: FuzzMessage (0.06s)
     --- PASS: FuzzMessage/0e2295391b7f3eb958c9f4d01172dbfb7a521ae80b57ef7742534c4629439160 (0.00s)
     --- PASS: FuzzMessage/245b929694bde0bb71c22ec2591f9355b891c85fd8b955034c53b453413a8a1e (0.00s)
     --- PASS: FuzzMessage/27e983676cba4e3d4c6b268de4dc3c2a4962db616979175fdf675d438afb3c8a (0.00s)
@@ -1029,7 +1047,7 @@
 === RUN   FuzzSetters/dbf9c906416f494d427c7268f4d3c5be67d82281443e7ae68f9acfb5b0069b7d
 === RUN   FuzzSetters/eccfde8fecaeceec3a9b7967ec3533321b1cf9865e938546b35e3b9ad8e8d6bb
 === RUN   FuzzSetters/fd0cec4a969fa1eb5d8ba153dc60ee11ca5b7ccfcc446ebc90f659eb9977cb0b
---- PASS: FuzzSetters (0.00s)
+--- PASS: FuzzSetters (0.05s)
     --- PASS: FuzzSetters/337822ea9b278f300ec686794913e39fbb540cb4f216da38283b08b85b4fdfa3 (0.00s)
     --- PASS: FuzzSetters/651f4211e426e9bc0b4ed8fecdcd545d3bec97850fad9cf19c06a0294b1c62c3 (0.00s)
     --- PASS: FuzzSetters/8d3066943508ff56500191c92915039470fdda0830ff3e3f5d1dd88c6fb8550a (0.00s)
@@ -1046,7 +1064,7 @@
 === RUN   ExampleMessage
 --- PASS: ExampleMessage (0.00s)
 PASS
-ok  	github.com/pion/stun	1.569s
+ok  	github.com/pion/stun	1.543s
 ?   	github.com/pion/stun/cmd/stun-bench	[no test files]
 ?   	github.com/pion/stun/cmd/stun-client	[no test files]
 ?   	github.com/pion/stun/cmd/stun-decode	[no test files]
@@ -1063,7 +1081,7 @@
 === RUN   TestHMACPool_SHA1
 --- PASS: TestHMACPool_SHA1 (0.00s)
 === RUN   TestHMACPool_SHA256
---- PASS: TestHMACPool_SHA256 (0.00s)
+--- PASS: TestHMACPool_SHA256 (0.01s)
 === RUN   TestAssertBlockSize
 === RUN   TestAssertBlockSize/Positive
 === RUN   TestAssertBlockSize/Negative
@@ -1071,7 +1089,7 @@
     --- PASS: TestAssertBlockSize/Positive (0.00s)
     --- PASS: TestAssertBlockSize/Negative (0.00s)
 PASS
-ok  	github.com/pion/stun/internal/hmac	0.030s
+ok  	github.com/pion/stun/internal/hmac	0.034s
 ?   	github.com/pion/stun/internal/testutil	[no test files]
 ?   	github.com/pion/stun/stuntest	[no test files]
    create-stamp debian/debhelper-build-stamp
@@ -1103,12 +1121,14 @@
 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/2649/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2649/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/4842 and its subdirectories
-I: Current time: Mon Apr 10 07:55:11 -12 2023
-I: pbuilder-time-stamp: 1681156511
+I: removing directory /srv/workspace/pbuilder/2649 and its subdirectories
+I: Current time: Mon May 13 16:20:48 +14 2024
+I: pbuilder-time-stamp: 1715566848