Diff of the two buildlogs:

--
--- b1/build.log	2025-01-19 04:16:47.700935222 +0000
+++ b2/build.log	2025-01-19 04:20:27.515019414 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Jan 18 16:12:49 -12 2025
-I: pbuilder-time-stamp: 1737259969
+I: Current time: Sun Jan 19 18:16:56 +14 2025
+I: pbuilder-time-stamp: 1737260216
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking golang-ptutil_0.0~git20240710.6c4d8ed-2.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/20468/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/11066/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64a.
+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 19 04:17 /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/11066/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/11066/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='unstable'
-  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]="37" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
+  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=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=4 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='a28fc031e94d4316b0d602c8eb522e93'
-  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='20468'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=f5d1122c49684d84ab6a03c797d72d89
+  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=11066
   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.preaUpMf/pbuilderrc_EZd4 --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.preaUpMf/b1 --logfile b1/build.log golang-ptutil_0.0~git20240710.6c4d8ed-2.dsc'
-  SUDO_GID='110'
-  SUDO_UID='103'
-  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.preaUpMf/pbuilderrc_5Att --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.preaUpMf/b2 --logfile b2/build.log golang-ptutil_0.0~git20240710.6c4d8ed-2.dsc'
+  SUDO_GID=114
+  SUDO_UID=108
+  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 virt32z 6.1.0-30-armmp-lpae #1 SMP Debian 6.1.124-1 (2025-01-12) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-30-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/20468/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/11066/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -185,7 +217,7 @@
 Get: 70 http://deb.debian.org/debian unstable/main armhf golang-github-prometheus-procfs-dev all 0.14.0-1 [183 kB]
 Get: 71 http://deb.debian.org/debian unstable/main armhf golang-github-prometheus-client-golang-dev all 1.20.5-1 [188 kB]
 Get: 72 http://deb.debian.org/debian unstable/main armhf golang-github-mwitkow-go-conntrack-dev all 0.0~git20190716.2f06839-3 [14.6 kB]
-Fetched 118 MB in 10s (11.6 MB/s)
+Fetched 118 MB in 2s (73.0 MB/s)
 Preconfiguring packages ...
 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 ... 19564 files and directories currently installed.)
@@ -488,7 +520,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-ptutil-0.0~git20240710.6c4d8ed/ && 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-ptutil_0.0~git20240710.6c4d8ed-2_source.changes
+I: user script /srv/workspace/pbuilder/11066/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/11066/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-ptutil-0.0~git20240710.6c4d8ed/ && 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-ptutil_0.0~git20240710.6c4d8ed-2_source.changes
 dpkg-buildpackage: info: source package golang-ptutil
 dpkg-buildpackage: info: source version 0.0~git20240710.6c4d8ed-2
 dpkg-buildpackage: info: source distribution unstable
@@ -506,40 +542,40 @@
    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 3 gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safelog gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safeprom
+	cd _build && go install -trimpath -v -p 4 gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safelog gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safeprom
+internal/byteorder
 internal/unsafeheader
 internal/goarch
-internal/byteorder
 internal/cpu
-internal/abi
-internal/chacha8rand
-internal/bytealg
 internal/coverage/rtcov
+internal/abi
 internal/godebugs
-internal/goos
+internal/chacha8rand
 internal/goexperiment
+internal/goos
+internal/bytealg
 internal/profilerecord
 internal/runtime/atomic
 internal/runtime/syscall
-internal/stringslite
 runtime/internal/math
-internal/runtime/exithook
+internal/stringslite
 runtime/internal/sys
 internal/race
 sync/atomic
 unicode
-runtime
+internal/runtime/exithook
 unicode/utf8
 cmp
-math/bits
-math
 encoding
+math/bits
 internal/itoa
 internal/asan
 internal/msan
+math
 unicode/utf16
 log/internal
 container/list
+runtime
 crypto/internal/alias
 crypto/internal/boring/sig
 vendor/golang.org/x/crypto/cryptobyte/asn1
@@ -547,76 +583,92 @@
 internal/nettrace
 google.golang.org/protobuf/internal/flags
 google.golang.org/protobuf/internal/set
+iter
+crypto/subtle
 internal/reflectlite
 sync
-iter
 slices
-crypto/subtle
 internal/weak
 maps
+runtime/metrics
+internal/singleflight
+internal/testlog
+internal/bisect
+google.golang.org/protobuf/internal/pragma
 errors
+runtime/cgo
 sort
-internal/bisect
 io
 strconv
-internal/oserror
-path
 bytes
 strings
-internal/godebug
-syscall
 reflect
+internal/oserror
+path
 regexp/syntax
+internal/godebug
+syscall
 regexp
-time
 gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safelog
+bufio
+time
 internal/syscall/unix
 internal/syscall/execenv
-internal/testlog
-bufio
 hash
+crypto/cipher
 hash/crc32
 crypto
-io/fs
-encoding/binary
-internal/fmtsort
-internal/poll
-internal/filepathlite
-context
-encoding/base64
-crypto/cipher
 crypto/internal/randutil
 math/rand
-os
 crypto/internal/boring
 crypto/aes
 crypto/des
 crypto/internal/edwards25519/field
 crypto/internal/nistec/fiat
+encoding/binary
+internal/fmtsort
 crypto/sha512
+io/fs
+internal/poll
+encoding/base64
+context
+internal/filepathlite
 crypto/internal/edwards25519
-fmt
 crypto/hmac
 vendor/golang.org/x/crypto/chacha20
+os
 vendor/golang.org/x/crypto/internal/poly1305
 vendor/golang.org/x/crypto/chacha20poly1305
 vendor/golang.org/x/crypto/hkdf
+crypto/md5
+crypto/rc4
+crypto/sha1
+crypto/sha256
+encoding/pem
+vendor/golang.org/x/net/dns/dnsmessage
+math/rand/v2
+internal/concurrent
+unique
+fmt
+crypto/internal/nistec
 vendor/golang.org/x/sys/cpu
+net/netip
 vendor/golang.org/x/crypto/sha3
+path/filepath
+vendor/golang.org/x/text/transform
+crypto/ecdh
 encoding/json
 log
 compress/flate
 math/big
-compress/gzip
-crypto/internal/nistec
-crypto/md5
-crypto/rc4
-crypto/sha1
-crypto/sha256
-crypto/ecdh
 encoding/hex
-encoding/pem
-vendor/golang.org/x/net/dns/dnsmessage
+net
+compress/gzip
+net/url
+vendor/golang.org/x/text/unicode/bidi
+vendor/golang.org/x/text/unicode/norm
+vendor/golang.org/x/text/secure/bidirule
+vendor/golang.org/x/net/http2/hpack
 crypto/rand
 crypto/elliptic
 crypto/internal/bigmod
@@ -627,46 +679,33 @@
 crypto/internal/mlkem768
 crypto/rsa
 crypto/dsa
-internal/singleflight
-math/rand/v2
+vendor/golang.org/x/net/idna
+mime
 vendor/golang.org/x/crypto/cryptobyte
 crypto/x509/pkix
-internal/concurrent
-runtime/cgo
-unique
 crypto/ecdsa
-net/netip
-net/url
-path/filepath
-vendor/golang.org/x/text/transform
-vendor/golang.org/x/text/unicode/bidi
-vendor/golang.org/x/text/unicode/norm
-vendor/golang.org/x/text/secure/bidirule
-vendor/golang.org/x/net/http2/hpack
-mime
-vendor/golang.org/x/net/idna
 mime/quotedprintable
 net/http/internal
 net/http/internal/ascii
 github.com/beorn7/perks/quantile
-net
 github.com/cespare/xxhash
 hash/fnv
-google.golang.org/protobuf/internal/pragma
 embed
-google.golang.org/protobuf/internal/detrand
-google.golang.org/protobuf/internal/errors
-google.golang.org/protobuf/internal/editiondefaults
 go/token
-google.golang.org/protobuf/encoding/protowire
-google.golang.org/protobuf/reflect/protoreflect
+google.golang.org/protobuf/internal/editiondefaults
+google.golang.org/protobuf/internal/detrand
 io/ioutil
+google.golang.org/protobuf/internal/errors
 google.golang.org/protobuf/internal/version
-runtime/metrics
+google.golang.org/protobuf/encoding/protowire
 github.com/munnerz/goautoneg
 github.com/prometheus/procfs/internal/fs
-google.golang.org/protobuf/internal/descfmt
+github.com/prometheus/procfs/internal/util
+google.golang.org/protobuf/reflect/protoreflect
+golang.org/x/sys/unix
+runtime/debug
 google.golang.org/protobuf/internal/descopts
+google.golang.org/protobuf/internal/descfmt
 google.golang.org/protobuf/internal/strs
 google.golang.org/protobuf/internal/encoding/text
 google.golang.org/protobuf/internal/encoding/messageset
@@ -675,50 +714,47 @@
 google.golang.org/protobuf/internal/encoding/defval
 google.golang.org/protobuf/reflect/protoregistry
 google.golang.org/protobuf/runtime/protoiface
-github.com/prometheus/procfs/internal/util
 google.golang.org/protobuf/proto
-golang.org/x/sys/unix
-google.golang.org/protobuf/internal/filedesc
 google.golang.org/protobuf/encoding/prototext
-google.golang.org/protobuf/internal/encoding/tag
-google.golang.org/protobuf/internal/impl
+google.golang.org/protobuf/internal/filedesc
 google.golang.org/protobuf/encoding/protodelim
-runtime/debug
-net/textproto
 crypto/x509
-vendor/golang.org/x/net/http/httpguts
+net/textproto
 vendor/golang.org/x/net/http/httpproxy
-mime/multipart
 github.com/prometheus/procfs
-google.golang.org/protobuf/internal/filetype
+vendor/golang.org/x/net/http/httpguts
+mime/multipart
+google.golang.org/protobuf/internal/encoding/tag
+google.golang.org/protobuf/internal/impl
 crypto/tls
+net/http/httptrace
+net/http
+google.golang.org/protobuf/internal/filetype
 google.golang.org/protobuf/runtime/protoimpl
 google.golang.org/protobuf/types/known/timestamppb
 github.com/prometheus/client_model/go
 github.com/prometheus/common/model
 github.com/prometheus/client_golang/prometheus/internal
-net/http/httptrace
-net/http
 expvar
 github.com/prometheus/common/expfmt
 github.com/prometheus/client_golang/prometheus
 gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safeprom
    dh_auto_test -O--builddirectory=_build -O--buildsystem=golang
-	cd _build && go test -vet=off -v -p 3 gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safelog gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safeprom
+	cd _build && go test -vet=off -v -p 4 gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safelog gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safeprom
 === RUN   TestLogScrubberSplit
 --- PASS: TestLogScrubberSplit (0.00s)
 === RUN   TestLogScrubberMessages
 --- PASS: TestLogScrubberMessages (0.01s)
 === RUN   TestLogScrubberGoodFormats
---- PASS: TestLogScrubberGoodFormats (0.01s)
+--- PASS: TestLogScrubberGoodFormats (0.00s)
 PASS
-ok  	gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safelog	0.073s
+ok  	gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safelog	0.039s
 === RUN   TestIncVecWithLabelValues
---- PASS: TestIncVecWithLabelValues (0.06s)
+--- PASS: TestIncVecWithLabelValues (0.04s)
 === RUN   TestIncVecWith
---- PASS: TestIncVecWith (0.06s)
+--- PASS: TestIncVecWith (0.04s)
 PASS
-ok  	gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safeprom	0.147s
+ok  	gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safeprom	0.084s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--builddirectory=_build -O--buildsystem=golang
    dh_prep -O--builddirectory=_build -O--buildsystem=golang
@@ -745,12 +781,14 @@
 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/11066/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/11066/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/20468 and its subdirectories
-I: Current time: Sat Jan 18 16:16:44 -12 2025
-I: pbuilder-time-stamp: 1737260204
+I: removing directory /srv/workspace/pbuilder/11066 and its subdirectories
+I: Current time: Sun Jan 19 18:20:23 +14 2025
+I: pbuilder-time-stamp: 1737260423