Diff of the two buildlogs:

--
--- b1/build.log	2024-05-17 23:22:49.881385110 +0000
+++ b2/build.log	2024-05-17 23:26:06.057028328 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Jun 19 17:43:28 -12 2025
-I: pbuilder-time-stamp: 1750398208
+I: Current time: Sat May 18 13:22:52 +14 2024
+I: pbuilder-time-stamp: 1715988172
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-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/3889691/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2565817/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos11-amd64.
+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 17 23:23 /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/2565817/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2565817/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='amd64'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=42 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='amd64'
+  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]="x86_64-pc-linux-gnu")
+  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=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=20 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='c6258fa9cb814a678e33d03d1a7dffbb'
-  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='3889691'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=c96921b4c7dd4e9aa6feee8802a5f5db
+  LANG=C
+  LANGUAGE=et_EE:et
+  LC_ALL=C
+  MACHTYPE=x86_64-pc-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=2565817
   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.WRE1jfl0/pbuilderrc_Zl1A --distribution unstable --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.WRE1jfl0/b1 --logfile b1/build.log golang-golang-x-sys_0.19.0-1.dsc'
-  SUDO_GID='111'
-  SUDO_UID='106'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://213.165.73.152:3128'
+  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.WRE1jfl0/pbuilderrc_ZamY --distribution unstable --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.WRE1jfl0/b2 --logfile b2/build.log golang-golang-x-sys_0.19.0-1.dsc'
+  SUDO_GID=111
+  SUDO_UID=106
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://46.16.76.132:3128
 I: uname -a
-  Linux ionos15-amd64 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Jun 18 14:05 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3889691/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 17 07:43 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2565817/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -155,7 +187,7 @@
 Get: 39 http://deb.debian.org/debian unstable/main amd64 golang-src all 2:1.22~3 [5020 B]
 Get: 40 http://deb.debian.org/debian unstable/main amd64 golang-go amd64 2:1.22~3 [44.2 kB]
 Get: 41 http://deb.debian.org/debian unstable/main amd64 golang-any amd64 2:1.22~3 [5104 B]
-Fetched 62.8 MB in 11s (5593 kB/s)
+Fetched 62.8 MB in 3s (23.6 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 ... 19719 files and directories currently installed.)
@@ -334,7 +366,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-golang-x-sys-0.19.0/ && 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_0.19.0-1_source.changes
+I: user script /srv/workspace/pbuilder/2565817/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/2565817/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-golang-x-sys-0.19.0/ && 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_0.19.0-1_source.changes
 dpkg-buildpackage: info: source package golang-golang-x-sys
 dpkg-buildpackage: info: source version 0.19.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -352,35 +388,35 @@
    dh_autoreconf -O--builddirectory=_build -O--buildsystem=golang
    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 42 golang.org/x/sys/cpu golang.org/x/sys/execabs golang.org/x/sys/unix
+	cd _build && go install -trimpath -v -p 20 golang.org/x/sys/cpu golang.org/x/sys/execabs golang.org/x/sys/unix
+internal/goarch
 internal/itoa
 internal/coverage/rtcov
-internal/goarch
-internal/unsafeheader
-internal/godebugs
-internal/goos
+internal/race
 unicode/utf8
-internal/cpu
+math/bits
 cmp
+unicode
+runtime/internal/math
+internal/chacha8rand
+internal/godebugs
+internal/unsafeheader
+internal/goos
+internal/goexperiment
 runtime/internal/atomic
-math/bits
 runtime/internal/syscall
-internal/goexperiment
+internal/cpu
 sync/atomic
-unicode
-internal/race
 internal/abi
-internal/chacha8rand
-runtime/internal/math
+slices
 runtime/internal/sys
 internal/bytealg
-slices
 math
 runtime
 internal/reflectlite
 sync
-internal/bisect
 internal/testlog
+internal/bisect
 internal/godebug
 errors
 sort
@@ -393,27 +429,27 @@
 strings
 bytes
 reflect
+internal/syscall/unix
 time
 internal/syscall/execenv
-internal/syscall/unix
 internal/fmtsort
 encoding/binary
+io/fs
 context
 internal/poll
-io/fs
 golang.org/x/sys/unix
 os
-golang.org/x/sys/cpu
-fmt
 path/filepath
+fmt
+golang.org/x/sys/cpu
 os/exec
 golang.org/x/sys/execabs
    dh_auto_test -O--builddirectory=_build -O--buildsystem=golang
-	cd _build && go test -vet=off -v -p 42 golang.org/x/sys/cpu golang.org/x/sys/execabs golang.org/x/sys/unix
+	cd _build && go test -vet=off -v -p 20 golang.org/x/sys/cpu golang.org/x/sys/execabs golang.org/x/sys/unix
 === RUN   TestParseRelease
 --- PASS: TestParseRelease (0.00s)
 === RUN   TestAuxvFromRuntime
-    runtime_auxv_go121_test.go:16: got: [33 140728036368384 51 1776 16 395049983 6 4096 17 100 3 4194368 4 56 5 6 7 0 8 0 9 4657440 11 1111 12 1111 13 1111 14 1111 23 0 25 140728036268009 26 2 31 140728036274130 15 140728036268025 27 28 28 32]
+    runtime_auxv_go121_test.go:16: got: [33 140733567410176 51 1776 16 126614527 6 4096 17 100 3 4194368 4 56 5 6 7 0 8 0 9 4657440 11 2222 12 2222 13 2222 14 2222 23 0 25 140733566857705 26 0 31 140733566869458 15 140733566857721]
 --- PASS: TestAuxvFromRuntime (0.00s)
 === RUN   TestAMD64minimalFeatures
 --- PASS: TestAMD64minimalFeatures (0.00s)
@@ -430,7 +466,7 @@
 === RUN   TestIsBigEndian
 --- PASS: TestIsBigEndian (0.00s)
 PASS
-ok  	golang.org/x/sys/cpu	0.009s
+ok  	golang.org/x/sys/cpu	0.044s
 === RUN   TestFixCmd
 --- PASS: TestFixCmd (0.00s)
 === RUN   TestCommand
@@ -440,7 +476,7 @@
 === RUN   TestDoesNotExist
 --- PASS: TestDoesNotExist (0.00s)
 PASS
-ok  	golang.org/x/sys/execabs	0.019s
+ok  	golang.org/x/sys/execabs	0.055s
 === RUN   TestNewIfreq
 --- PASS: TestNewIfreq (0.00s)
 === RUN   TestIfreqSize
@@ -582,14 +618,14 @@
     --- PASS: TestDevices//dev/urandom_1:9 (0.00s)
     --- PASS: TestDevices//dev/tty_5:0 (0.00s)
 === RUN   TestDirent
-    dirent_test.go:31: tmpdir: /tmp/TestDirent917955013/001
+    dirent_test.go:31: tmpdir: /tmp/TestDirent1435253185/001
     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
     dirent_test.go:76: names: ["00000000000" "111111111111" "2222222222222" "33333333333333" "444444444444444" "5555555555555555" "66666666666666666" "777777777777777777" "8888888888888888888" "99999999999999999999"]
 --- PASS: TestDirent (0.00s)
 === RUN   TestDirentRepeat
---- PASS: TestDirentRepeat (0.01s)
+--- PASS: TestDirentRepeat (0.03s)
 === RUN   TestDup3
 --- PASS: TestDup3 (0.00s)
 === RUN   TestFdSet
@@ -599,11 +635,11 @@
 === RUN   TestMremap
 --- PASS: TestMremap (0.00s)
 === RUN   TestPipe2
---- PASS: TestPipe2 (0.00s)
+--- PASS: TestPipe2 (0.01s)
 === RUN   TestNonblockingPipe2
 --- PASS: TestNonblockingPipe2 (0.00s)
 === RUN   TestSendfile
---- PASS: TestSendfile (0.00s)
+--- PASS: TestSendfile (0.01s)
 === RUN   TestIoctlGetEthtoolDrvinfo
 --- PASS: TestIoctlGetEthtoolDrvinfo (0.00s)
 === RUN   TestIoctlGetInt
@@ -620,7 +656,7 @@
 === RUN   TestIoctlIfreq
 --- PASS: TestIoctlIfreq (0.00s)
 === RUN   TestPidfd
---- PASS: TestPidfd (0.01s)
+--- PASS: TestPidfd (0.03s)
 === RUN   TestPpoll
 --- PASS: TestPpoll (0.10s)
 === RUN   TestTime
@@ -644,7 +680,7 @@
 === RUN   TestClockNanosleep
 --- PASS: TestClockNanosleep (0.10s)
 === RUN   TestOpenByHandleAt
-    syscall_linux_test.go:790: mountID: 95, handle: size=8, type=1, bytes="\xa2\x87\x88\x00|\x9bۤ"
+    syscall_linux_test.go:790: mountID: 94, handle: size=8, type=1, bytes="1H\xc6\x00-\xbdʿ"
     syscall_linux_test.go:795: openMountByID: mountID not found
 --- SKIP: TestOpenByHandleAt (0.00s)
 === RUN   TestEpoll
@@ -661,13 +697,13 @@
 === RUN   TestPwritevOffsets
 --- PASS: TestPwritevOffsets (0.00s)
 === RUN   TestReadvAllocate
---- PASS: TestReadvAllocate (0.01s)
+--- PASS: TestReadvAllocate (0.05s)
 === RUN   TestSockaddrALG
 --- PASS: TestSockaddrALG (0.00s)
 === RUN   TestEnv
 --- PASS: TestEnv (0.00s)
 === RUN   TestUname
-    syscall_test.go:42: OS: Linux/x86_64 6.6.13+bpo-amd64
+    syscall_test.go:42: OS: Linux/x86_64 6.1.0-21-amd64
 --- PASS: TestUname (0.00s)
 === RUN   TestStatFieldNames
 --- PASS: TestStatFieldNames (0.00s)
@@ -700,7 +736,7 @@
 === RUN   TestFcntlFlock
 --- PASS: TestFcntlFlock (0.00s)
 === RUN   TestPassFD
---- PASS: TestPassFD (0.01s)
+--- PASS: TestPassFD (0.06s)
 === RUN   TestUnixRightsRoundtrip
 --- PASS: TestUnixRightsRoundtrip (0.00s)
 === RUN   TestRlimit
@@ -713,9 +749,9 @@
 === RUN   TestDup
 --- PASS: TestDup (0.00s)
 === RUN   TestPoll
---- PASS: TestPoll (0.11s)
+--- PASS: TestPoll (0.10s)
 === RUN   TestSelect
---- PASS: TestSelect (0.25s)
+--- PASS: TestSelect (0.26s)
 === RUN   TestGetwd
 --- PASS: TestGetwd (0.00s)
 === RUN   TestFstatat
@@ -735,7 +771,7 @@
 === RUN   TestSendmsgBuffers
 --- PASS: TestSendmsgBuffers (0.00s)
 === RUN   TestRecvmsgControl
---- PASS: TestRecvmsgControl (0.00s)
+--- PASS: TestRecvmsgControl (0.01s)
 === RUN   TestSysvSharedMemory
 --- PASS: TestSysvSharedMemory (0.00s)
 === RUN   TestTimeToTimespec
@@ -747,7 +783,7 @@
 === CONT  TestFcntlInt
 --- PASS: TestFcntlInt (0.00s)
 PASS
-ok  	golang.org/x/sys/unix	0.657s
+ok  	golang.org/x/sys/unix	0.841s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--builddirectory=_build -O--buildsystem=golang
    dh_prep -O--builddirectory=_build -O--buildsystem=golang
@@ -774,12 +810,14 @@
 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/2565817/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2565817/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/3889691 and its subdirectories
-I: Current time: Thu Jun 19 17:45:49 -12 2025
-I: pbuilder-time-stamp: 1750398349
+I: removing directory /srv/workspace/pbuilder/2565817 and its subdirectories
+I: Current time: Sat May 18 13:26:05 +14 2024
+I: pbuilder-time-stamp: 1715988365