Diff of the two buildlogs:

--
--- b1/build.log	2025-01-17 12:01:04.270656772 +0000
+++ b2/build.log	2025-01-17 12:04:11.182167400 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Jan 16 23:57:35 -12 2025
-I: pbuilder-time-stamp: 1737115055
+I: Current time: Sat Jan 18 02:01:19 +14 2025
+I: pbuilder-time-stamp: 1737115279
 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-github-emersion-go-pgpmail_0.2.2-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/29822/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/4196/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64b.
+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 17 12:01 /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/4196/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/4196/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='7bc80a10f2584840903a2456acc8db97'
-  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='29822'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=d653b03112c545a5a240adb197c5781f
+  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=4196
   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.BpqdEKVS/pbuilderrc_Oh5n --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.BpqdEKVS/b1 --logfile b1/build.log golang-github-emersion-go-pgpmail_0.2.2-1.dsc'
-  SUDO_GID='113'
-  SUDO_UID='107'
-  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.BpqdEKVS/pbuilderrc_iOC8 --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.BpqdEKVS/b2 --logfile b2/build.log golang-github-emersion-go-pgpmail_0.2.2-1.dsc'
+  SUDO_GID=113
+  SUDO_UID=107
+  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 ff4a 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/29822/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/4196/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -165,7 +197,7 @@
 Get: 50 http://deb.debian.org/debian unstable/main armhf golang-github-emersion-go-textwrapper-dev all 0.0~git20160606.d0e65e5-2 [3100 B]
 Get: 51 http://deb.debian.org/debian unstable/main armhf golang-github-emersion-go-message-dev all 0.17.0-1 [43.2 kB]
 Get: 52 http://deb.debian.org/debian unstable/main armhf golang-github-protonmail-go-crypto-dev all 1.1.5-1 [335 kB]
-Fetched 82.2 MB in 5s (17.1 MB/s)
+Fetched 82.2 MB in 1s (61.2 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.)
@@ -388,7 +420,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-emersion-go-pgpmail-0.2.2/ && 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-emersion-go-pgpmail_0.2.2-1_source.changes
+I: user script /srv/workspace/pbuilder/4196/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/4196/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-emersion-go-pgpmail-0.2.2/ && 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-emersion-go-pgpmail_0.2.2-1_source.changes
 dpkg-buildpackage: info: source package golang-github-emersion-go-pgpmail
 dpkg-buildpackage: info: source version 0.2.2-1
 dpkg-buildpackage: info: source distribution unstable
@@ -406,17 +442,17 @@
    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 github.com/emersion/go-pgpmail
+	cd _build && go install -trimpath -v -p 4 github.com/emersion/go-pgpmail
 internal/unsafeheader
+internal/byteorder
 internal/goarch
 internal/cpu
-internal/byteorder
-internal/abi
-internal/chacha8rand
-internal/bytealg
 internal/coverage/rtcov
+internal/abi
 internal/godebugs
+internal/chacha8rand
 internal/goexperiment
+internal/bytealg
 internal/goos
 internal/profilerecord
 internal/runtime/atomic
@@ -425,21 +461,21 @@
 runtime/internal/math
 runtime/internal/sys
 internal/race
-internal/runtime/exithook
 sync/atomic
 unicode
+internal/runtime/exithook
 unicode/utf8
 math/bits
-runtime
-math
 cmp
 internal/itoa
 internal/asan
+math
 internal/msan
 crypto/internal/alias
 crypto/internal/boring/sig
 github.com/ProtonMail/go-crypto/internal/byteutil
 unicode/utf16
+runtime
 vendor/golang.org/x/crypto/cryptobyte/asn1
 encoding
 image/color
@@ -447,84 +483,96 @@
 iter
 internal/reflectlite
 sync
-slices
 crypto/subtle
+slices
 internal/weak
 internal/bisect
-internal/testlog
 internal/singleflight
+internal/testlog
 runtime/cgo
 errors
+sort
 io
 strconv
+internal/oserror
+path
+internal/godebug
 bytes
 strings
 hash
 crypto
 reflect
-bufio
-internal/oserror
-path
-internal/godebug
 syscall
+bufio
 crypto/cipher
 crypto/internal/boring
 crypto/internal/randutil
 math/rand
-time
-internal/syscall/unix
-internal/syscall/execenv
 crypto/sha256
 crypto/sha512
-internal/fmtsort
-encoding/binary
 github.com/ProtonMail/go-crypto/openpgp/errors
-sort
-encoding/base64
 crypto/aes
-io/fs
-internal/poll
-github.com/ProtonMail/go-crypto/openpgp/armor
-github.com/ProtonMail/go-crypto/openpgp/aes/keywrap
+time
+internal/syscall/unix
+internal/syscall/execenv
 crypto/des
-internal/filepathlite
 github.com/ProtonMail/go-crypto/eax
 golang.org/x/crypto/cast5
 crypto/internal/edwards25519/field
 crypto/internal/nistec/fiat
-os
 crypto/internal/edwards25519
 github.com/cloudflare/circl/sign
-github.com/cloudflare/circl/internal/sha3
 compress/bzip2
-fmt
 hash/adler32
+internal/fmtsort
+encoding/binary
+io/fs
+internal/poll
+internal/filepathlite
 crypto/sha1
+os
+encoding/base64
+github.com/ProtonMail/go-crypto/openpgp/aes/keywrap
+github.com/cloudflare/circl/internal/sha3
+github.com/ProtonMail/go-crypto/openpgp/armor
 golang.org/x/crypto/blake2b
-golang.org/x/crypto/argon2
 crypto/hmac
 golang.org/x/crypto/hkdf
 image
-math/big
+golang.org/x/crypto/argon2
+context
+crypto/internal/nistec
+vendor/golang.org/x/net/dns/dnsmessage
+image/internal/imageutil
+image/jpeg
+fmt
+golang.org/x/sys/cpu
+crypto/ecdh
+golang.org/x/crypto/sha3
+io/ioutil
+math/rand/v2
+golang.org/x/text/transform
+internal/concurrent
 encoding/hex
+compress/flate
+math/big
+unique
 github.com/ProtonMail/go-crypto/ocb
-crypto/internal/nistec
+net/netip
 github.com/ProtonMail/go-crypto/openpgp/internal/algorithm
-compress/flate
-compress/zlib
-crypto/ecdh
 github.com/ProtonMail/go-crypto/openpgp/s2k
-image/internal/imageutil
-golang.org/x/sys/cpu
+compress/zlib
+mime
+net
 crypto/rand
 crypto/internal/bigmod
 crypto/internal/boring/bbig
 crypto/elliptic
 encoding/asn1
 crypto/rsa
-github.com/ProtonMail/go-crypto/openpgp/internal/encoding
 github.com/ProtonMail/go-crypto/bitcurves
 github.com/ProtonMail/go-crypto/brainpool
+github.com/ProtonMail/go-crypto/openpgp/internal/encoding
 github.com/cloudflare/circl/internal/conv
 crypto/ed25519
 vendor/golang.org/x/crypto/cryptobyte
@@ -537,40 +585,28 @@
 github.com/cloudflare/circl/sign/ed25519
 github.com/cloudflare/circl/math/mlsbset
 crypto/dsa
-github.com/ProtonMail/go-crypto/openpgp/elgamal
 github.com/cloudflare/circl/ecc/goldilocks
-github.com/ProtonMail/go-crypto/openpgp/x25519
+github.com/ProtonMail/go-crypto/openpgp/elgamal
 github.com/ProtonMail/go-crypto/openpgp/ed25519
+github.com/ProtonMail/go-crypto/openpgp/x25519
 github.com/ProtonMail/go-crypto/openpgp/x448
-image/jpeg
-golang.org/x/crypto/sha3
-io/ioutil
 github.com/cloudflare/circl/sign/ed448
-context
-vendor/golang.org/x/net/dns/dnsmessage
-github.com/ProtonMail/go-crypto/openpgp/internal/ecc
 github.com/ProtonMail/go-crypto/openpgp/ed448
-math/rand/v2
+github.com/ProtonMail/go-crypto/openpgp/internal/ecc
 github.com/ProtonMail/go-crypto/openpgp/ecdh
 github.com/ProtonMail/go-crypto/openpgp/ecdsa
 github.com/ProtonMail/go-crypto/openpgp/eddsa
-internal/concurrent
-unique
 github.com/ProtonMail/go-crypto/openpgp/packet
-golang.org/x/text/transform
-net/netip
-mime
-net
 github.com/ProtonMail/go-crypto/openpgp
 net/textproto
 github.com/emersion/go-message/textproto
 github.com/emersion/go-pgpmail
    dh_auto_test -O--builddirectory=_build -O--buildsystem=golang
-	cd _build && go test -vet=off -v -p 3 github.com/emersion/go-pgpmail
+	cd _build && go test -vet=off -v -p 4 github.com/emersion/go-pgpmail
 === RUN   TestReader_encryptedSignedPGPMIME
---- PASS: TestReader_encryptedSignedPGPMIME (0.04s)
+--- PASS: TestReader_encryptedSignedPGPMIME (0.03s)
 === RUN   TestReader_encryptedSignedEncapsulatedPGPMIME
---- PASS: TestReader_encryptedSignedEncapsulatedPGPMIME (0.05s)
+--- PASS: TestReader_encryptedSignedEncapsulatedPGPMIME (0.03s)
 === RUN   TestReader_signedPGPMIME
 --- PASS: TestReader_signedPGPMIME (0.00s)
 === RUN   TestReader_signedPGPMIMEInvalid
@@ -580,11 +616,11 @@
 === RUN   TestReader_plaintext
 --- PASS: TestReader_plaintext (0.00s)
 === RUN   TestEncrypt
---- PASS: TestEncrypt (0.16s)
+--- PASS: TestEncrypt (0.09s)
 === RUN   TestSign
---- PASS: TestSign (0.06s)
+--- PASS: TestSign (0.03s)
 PASS
-ok  	github.com/emersion/go-pgpmail	0.345s
+ok  	github.com/emersion/go-pgpmail	0.199s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--builddirectory=_build -O--buildsystem=golang
    dh_prep -O--builddirectory=_build -O--buildsystem=golang
@@ -611,12 +647,14 @@
 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/4196/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/4196/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/29822 and its subdirectories
-I: Current time: Fri Jan 17 00:00:57 -12 2025
-I: pbuilder-time-stamp: 1737115257
+I: removing directory /srv/workspace/pbuilder/4196 and its subdirectories
+I: Current time: Sat Jan 18 02:04:02 +14 2025
+I: pbuilder-time-stamp: 1737115442