Diff of the two buildlogs:

--
--- b1/build.log	2025-01-05 17:42:15.756888361 +0000
+++ b2/build.log	2025-01-05 17:45:00.681350836 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Jan  5 05:40:15 -12 2025
-I: pbuilder-time-stamp: 1736098815
+I: Current time: Mon Jan  6 07:42:26 +14 2025
+I: pbuilder-time-stamp: 1736098946
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -28,52 +28,84 @@
 dpkg-source: info: applying debian-auto-cross-compile.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/16187/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/20901/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  5 17:42 /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/20901/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/20901/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='trixie'
-  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=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='3a552a55f5e84aea87c7e17977f9e469'
-  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='16187'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=b37983b0ad6d4fe1be8f10148d522072
+  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=20901
   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.tePGvvMz/pbuilderrc_jskH --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.tePGvvMz/b1 --logfile b1/build.log rust-pkg-config_0.3.31-1.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.tePGvvMz/pbuilderrc_vf0E --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.tePGvvMz/b2 --logfile b2/build.log rust-pkg-config_0.3.31-1.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 6.1.0-28-armmp-lpae #1 SMP Debian 6.1.119-1 (2024-11-22) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-28-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 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/16187/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/20901/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -86,7 +118,7 @@
 Depends: debhelper-compat (= 13), dh-sequence-cargo, cargo:native, rustc:native (>= 1.31), libstd-rust-dev, pkgconf
 dpkg-deb: building package 'pbuilder-satisfydepends-dummy' in '/tmp/satisfydepends-aptitude/pbuilder-satisfydepends-dummy.deb'.
 Selecting previously unselected package pbuilder-satisfydepends-dummy.
-(Reading database ... 19679 files and directories currently installed.)
+(Reading database ... 19675 files and directories currently installed.)
 Preparing to unpack .../pbuilder-satisfydepends-dummy.deb ...
 Unpacking pbuilder-satisfydepends-dummy (0.invalid.0) ...
 dpkg: pbuilder-satisfydepends-dummy: dependency problems, but configuring anyway as you requested:
@@ -193,10 +225,10 @@
 Get: 74 http://deb.debian.org/debian trixie/main armhf libpkgconf3 armhf 1.8.1-4 [31.8 kB]
 Get: 75 http://deb.debian.org/debian trixie/main armhf pkgconf-bin armhf 1.8.1-4 [29.2 kB]
 Get: 76 http://deb.debian.org/debian trixie/main armhf pkgconf armhf 1.8.1-4 [26.1 kB]
-Fetched 121 MB in 25s (4858 kB/s)
+Fetched 121 MB in 2s (50.0 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.12-minimal:armhf.
-(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 ... 19679 files and directories currently installed.)
+(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 ... 19675 files and directories currently installed.)
 Preparing to unpack .../libpython3.12-minimal_3.12.8-3_armhf.deb ...
 Unpacking libpython3.12-minimal:armhf (3.12.8-3) ...
 Selecting previously unselected package libexpat1:armhf.
@@ -209,7 +241,7 @@
 Setting up libexpat1:armhf (2.6.4-1) ...
 Setting up python3.12-minimal (3.12.8-3) ...
 Selecting previously unselected package python3-minimal.
-(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 ... 19999 files and directories currently installed.)
+(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 ... 19995 files and directories currently installed.)
 Preparing to unpack .../00-python3-minimal_3.12.8-1_armhf.deb ...
 Unpacking python3-minimal (3.12.8-1) ...
 Selecting previously unselected package media-types.
@@ -271,7 +303,7 @@
 Unpacking libpython3-stdlib:armhf (3.12.8-1) ...
 Setting up python3-minimal (3.12.8-1) ...
 Selecting previously unselected package python3.
-(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 ... 21062 files and directories currently installed.)
+(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 ... 21058 files and directories currently installed.)
 Preparing to unpack .../00-python3_3.12.8-1_armhf.deb ...
 Unpacking python3 (3.12.8-1) ...
 Selecting previously unselected package sensible-utils.
@@ -460,8 +492,8 @@
 Setting up tzdata (2024b-4) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Sun Jan  5 17:41:40 UTC 2025.
-Universal Time is now:  Sun Jan  5 17:41:40 UTC 2025.
+Local time is now:      Sun Jan  5 17:44:25 UTC 2025.
+Universal Time is now:  Sun Jan  5 17:44:25 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -526,7 +558,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/rust-pkg-config-0.3.31/ && 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  > ../rust-pkg-config_0.3.31-1_source.changes
+I: user script /srv/workspace/pbuilder/20901/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/20901/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/rust-pkg-config-0.3.31/ && 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  > ../rust-pkg-config_0.3.31-1_source.changes
 dpkg-buildpackage: info: source package rust-pkg-config
 dpkg-buildpackage: info: source version 0.3.31-1
 dpkg-buildpackage: info: source distribution unstable
@@ -536,7 +572,7 @@
  debian/rules clean
 dh clean --buildsystem cargo
    dh_auto_clean -O--buildsystem=cargo
-debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=3'] [] ['-j3'] 
+debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=4'] [] ['-j4'] 
 debian cargo wrapper: rust_type, gnu_type: armv7-unknown-linux-gnueabihf, arm-linux-gnueabihf
 debian cargo wrapper: running subprocess (['env', 'RUST_BACKTRACE=1', '/usr/bin/cargo', 'clean', '--verbose', '--verbose'],) {'check': True}
      Removed 0 files
@@ -547,14 +583,14 @@
    dh_update_autotools_config -O--buildsystem=cargo
    dh_autoreconf -O--buildsystem=cargo
    dh_auto_configure -O--buildsystem=cargo
-debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=3'] [] ['-j3'] 
+debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=4'] [] ['-j4'] 
 debian cargo wrapper: rust_type, gnu_type: armv7-unknown-linux-gnueabihf, arm-linux-gnueabihf
 debian cargo wrapper: linking /usr/share/cargo/registry/* into /build/reproducible-path/rust-pkg-config-0.3.31/debian/cargo_registry/
    dh_auto_build -O--buildsystem=cargo
    dh_auto_test -O--buildsystem=cargo
-debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=3'] [] ['-j3'] 
+debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=4'] [] ['-j4'] 
 debian cargo wrapper: rust_type, gnu_type: armv7-unknown-linux-gnueabihf, arm-linux-gnueabihf
-debian cargo wrapper: running subprocess (['env', 'RUST_BACKTRACE=1', '/usr/bin/cargo', '-Zavoid-dev-deps', 'build', '--verbose', '--verbose', '-j3', '--target', 'armv7-unknown-linux-gnueabihf'],) {}
+debian cargo wrapper: running subprocess (['env', 'RUST_BACKTRACE=1', '/usr/bin/cargo', '-Zavoid-dev-deps', 'build', '--verbose', '--verbose', '-j4', '--target', 'armv7-unknown-linux-gnueabihf'],) {}
    Compiling pkg-config v0.3.31 (/build/reproducible-path/rust-pkg-config-0.3.31)
      Running `CARGO=/usr/bin/cargo CARGO_CRATE_NAME=pkg_config CARGO_MANIFEST_DIR=/build/reproducible-path/rust-pkg-config-0.3.31 CARGO_MANIFEST_PATH=/build/reproducible-path/rust-pkg-config-0.3.31/Cargo.toml CARGO_PKG_AUTHORS='Alex Crichton <alex@alexcrichton.com>' CARGO_PKG_DESCRIPTION='A library to run the pkg-config system tool at build time in order to be used in
 Cargo build scripts.
@@ -577,7 +613,7 @@
     = note: `#[warn(unreachable_code)]` on by default
 
 warning: `pkg-config` (lib) generated 1 warning
-    Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.65s
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.34s
 rustc 1.83.0+dfsg1-1 1
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=cargo
@@ -608,12 +644,14 @@
 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/20901/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/20901/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/16187 and its subdirectories
-I: Current time: Sun Jan  5 05:42:12 -12 2025
-I: pbuilder-time-stamp: 1736098932
+I: removing directory /srv/workspace/pbuilder/20901 and its subdirectories
+I: Current time: Mon Jan  6 07:44:53 +14 2025
+I: pbuilder-time-stamp: 1736099093