Diff of the two buildlogs:

--
--- b1/build.log	2024-12-14 07:48:46.144180528 +0000
+++ b2/build.log	2024-12-14 07:50:15.152152091 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri Jan 16 02:10:33 -12 2026
-I: pbuilder-time-stamp: 1768572633
+I: Current time: Sat Jan 17 04:11:48 +14 2026
+I: pbuilder-time-stamp: 1768572708
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -29,52 +29,84 @@
 dpkg-source: info: applying 03-skip-TestOpenByHandleAt-if-openMountByID-fails.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3803113/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/666226/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink01-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 Jan 16 14:11 /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/666226/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/666226/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='033c9df845a94d1cacfe7ff8fd9fe010'
-  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='3803113'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=dc1b9a3ac56f4de3a4f4dc4b281b7490
+  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=666226
   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.DuMlAIjh/pbuilderrc_r4fl --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.DuMlAIjh/b1 --logfile b1/build.log golang-golang-x-sys_0.22.0-1.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.DuMlAIjh/pbuilderrc_QBrO --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.DuMlAIjh/b2 --logfile b2/build.log golang-golang-x-sys_0.22.0-1.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 codethink03-arm64 6.1.0-28-cloud-arm64 #1 SMP Debian 6.1.119-1 (2024-11-22) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-28-cloud-arm64 #1 SMP Debian 6.1.119-1 (2024-11-22) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3803113/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/666226/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -149,7 +181,7 @@
 Get: 33 http://deb.debian.org/debian trixie/main arm64 golang-src all 2:1.23~2 [5088 B]
 Get: 34 http://deb.debian.org/debian trixie/main arm64 golang-go arm64 2:1.23~2 [44.3 kB]
 Get: 35 http://deb.debian.org/debian trixie/main arm64 golang-any arm64 2:1.23~2 [5172 B]
-Fetched 62.1 MB in 0s (132 MB/s)
+Fetched 62.1 MB in 1s (109 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 ... 20082 files and directories currently installed.)
@@ -304,7 +336,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-golang-x-sys-0.22.0/ && 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-golang-x-sys_0.22.0-1_source.changes
+I: user script /srv/workspace/pbuilder/666226/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/666226/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-golang-x-sys-0.22.0/ && 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-golang-x-sys_0.22.0-1_source.changes
 dpkg-buildpackage: info: source package golang-golang-x-sys
 dpkg-buildpackage: info: source version 0.22.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -324,29 +360,29 @@
    dh_auto_build -O--builddirectory=_build -O--buildsystem=golang
 	cd _build && go install -trimpath -v -p 12 golang.org/x/sys/cpu golang.org/x/sys/execabs golang.org/x/sys/unix
 internal/goarch
-internal/coverage/rtcov
-internal/godebugs
-internal/byteorder
 internal/goos
-runtime/internal/math
+internal/godebugs
+internal/coverage/rtcov
+internal/profilerecord
 internal/goexperiment
 internal/race
-unicode/utf8
-internal/profilerecord
-runtime/internal/sys
+internal/byteorder
 internal/unsafeheader
-internal/abi
-cmp
+sync/atomic
+runtime/internal/math
 internal/runtime/syscall
 internal/cpu
+runtime/internal/sys
+unicode/utf8
+cmp
 math/bits
 internal/asan
 internal/itoa
+internal/abi
 internal/msan
-sync/atomic
 unicode
-math
 internal/chacha8rand
+math
 internal/bytealg
 internal/runtime/atomic
 internal/runtime/exithook
@@ -370,14 +406,14 @@
 bytes
 reflect
 time
-internal/syscall/execenv
 internal/syscall/unix
+internal/syscall/execenv
 io/fs
-context
 internal/poll
+context
 internal/filepathlite
-internal/fmtsort
 encoding/binary
+internal/fmtsort
 os
 golang.org/x/sys/unix
 golang.org/x/sys/cpu
@@ -390,7 +426,7 @@
 === RUN   TestParseRelease
 --- PASS: TestParseRelease (0.00s)
 === RUN   TestAuxvFromRuntime
-    runtime_auxv_go121_test.go:16: got: [33 281473432702976 51 4720 16 1155071 6 4096 17 100 3 65600 4 56 5 6 7 0 8 0 9 547760 11 1111 12 1111 13 1111 14 1111 23 0 25 281474965497000 26 0 31 281474965503954 15 281474965497016]
+    runtime_auxv_go121_test.go:16: got: [33 281473785483264 51 4720 16 1155071 6 4096 17 100 3 65600 4 56 5 6 7 0 8 0 9 547760 11 2222 12 2222 13 2222 14 2222 23 0 25 281474432713448 26 0 31 281474432720850 15 281474432713464]
 --- PASS: TestAuxvFromRuntime (0.00s)
 === RUN   TestAMD64minimalFeatures
 --- PASS: TestAMD64minimalFeatures (0.00s)
@@ -407,7 +443,7 @@
 === RUN   TestIsBigEndian
 --- PASS: TestIsBigEndian (0.00s)
 PASS
-ok  	golang.org/x/sys/cpu	0.006s
+ok  	golang.org/x/sys/cpu	0.029s
 === RUN   TestFixCmd
 --- PASS: TestFixCmd (0.00s)
 === RUN   TestCommand
@@ -417,7 +453,7 @@
 === RUN   TestDoesNotExist
 --- PASS: TestDoesNotExist (0.00s)
 PASS
-ok  	golang.org/x/sys/execabs	0.006s
+ok  	golang.org/x/sys/execabs	0.030s
 === RUN   TestNewIfreq
 --- PASS: TestNewIfreq (0.00s)
 === RUN   TestIfreqSize
@@ -559,7 +595,7 @@
     --- PASS: TestDevices//dev/urandom_1:9 (0.00s)
     --- PASS: TestDevices//dev/tty_5:0 (0.00s)
 === RUN   TestDirent
-    dirent_test.go:31: tmpdir: /tmp/TestDirent663614377/001
+    dirent_test.go:31: tmpdir: /tmp/TestDirent2102931057/001
     dirent_test.go:62: ReadDirent: read 432 bytes
     dirent_test.go:69: ParseDirent: 10 new name(s)
     dirent_test.go:62: ReadDirent: read 0 bytes
@@ -625,7 +661,7 @@
 === RUN   TestClockNanosleep
 --- PASS: TestClockNanosleep (0.10s)
 === RUN   TestOpenByHandleAt
-    syscall_linux_test.go:796: mountID: 44, handle: size=12, type=1, bytes="\x90\xa6f*\xcf\n\xbe8\x00\x00\x00\x00"
+    syscall_linux_test.go:796: mountID: 44, handle: size=12, type=1, bytes="R'{\xdcL#\xb85\x00\x00\x00\x00"
     syscall_linux_test.go:801: openMountByID: mountID not found
 --- SKIP: TestOpenByHandleAt (0.00s)
 === RUN   TestEpoll
@@ -642,7 +678,7 @@
 === RUN   TestPwritevOffsets
 --- PASS: TestPwritevOffsets (0.00s)
 === RUN   TestReadvAllocate
---- PASS: TestReadvAllocate (0.00s)
+--- PASS: TestReadvAllocate (0.03s)
 === RUN   TestSockaddrALG
 --- PASS: TestSockaddrALG (0.00s)
 === RUN   TestEnv
@@ -681,7 +717,7 @@
 === RUN   TestFcntlFlock
 --- PASS: TestFcntlFlock (0.00s)
 === RUN   TestPassFD
---- PASS: TestPassFD (0.01s)
+--- PASS: TestPassFD (0.05s)
 === RUN   TestUnixRightsRoundtrip
 --- PASS: TestUnixRightsRoundtrip (0.00s)
 === RUN   TestRlimit
@@ -730,7 +766,7 @@
 === CONT  TestFcntlInt
 --- PASS: TestFcntlInt (0.00s)
 PASS
-ok  	golang.org/x/sys/unix	0.592s
+ok  	golang.org/x/sys/unix	0.680s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--builddirectory=_build -O--buildsystem=golang
    dh_prep -O--builddirectory=_build -O--buildsystem=golang
@@ -757,12 +793,14 @@
 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/666226/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/666226/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/3803113 and its subdirectories
-I: Current time: Fri Jan 16 02:11:44 -12 2026
-I: pbuilder-time-stamp: 1768572704
+I: removing directory /srv/workspace/pbuilder/666226 and its subdirectories
+I: Current time: Sat Jan 17 04:13:13 +14 2026
+I: pbuilder-time-stamp: 1768572793