Diff of the two buildlogs:

--
--- b1/build.log	2025-03-26 03:05:23.135022444 +0000
+++ b2/build.log	2025-03-26 03:06:51.239061804 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Mar 25 15:04:12 -12 2025
-I: pbuilder-time-stamp: 1742958252
+I: Current time: Tue Apr 28 23:28:25 +14 2026
+I: pbuilder-time-stamp: 1777368505
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -27,52 +27,84 @@
 dpkg-source: info: applying relax-deps.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3082896/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3585727/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink03-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 Apr 28 09:28 /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/3585727/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3585727/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='unstable'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='f04510f8aa4e4c05a22c96316898410f'
-  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='3082896'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=42a91e35632c43a7a06d9f646cf85a7c
+  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=3585727
   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.P7dRD3RU/pbuilderrc_KRE2 --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.P7dRD3RU/b1 --logfile b1/build.log rust-flate2_1.1.0-1.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.P7dRD3RU/pbuilderrc_YLEE --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.P7dRD3RU/b2 --logfile b2/build.log rust-flate2_1.1.0-1.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 codethink04-arm64 6.1.0-32-cloud-arm64 #1 SMP Debian 6.1.129-1 (2025-03-06) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-32-cloud-arm64 #1 SMP Debian 6.1.129-1 (2025-03-06) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Mar  4 11:20 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3082896/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar  4  2025 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3585727/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -199,7 +231,7 @@
 Get: 79 http://deb.debian.org/debian unstable/main arm64 librust-cfg-if-dev arm64 1.0.0-1+b2 [10.7 kB]
 Get: 80 http://deb.debian.org/debian unstable/main arm64 librust-crc32fast-dev arm64 1.4.2-1 [35.4 kB]
 Get: 81 http://deb.debian.org/debian unstable/main arm64 librust-miniz-oxide-dev arm64 0.7.1-1+b2 [50.8 kB]
-Fetched 127 MB in 1s (152 MB/s)
+Fetched 127 MB in 1s (215 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.13-minimal:arm64.
 (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 ... 19919 files and directories currently installed.)
@@ -478,8 +510,8 @@
 Setting up tzdata (2025b-1) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Wed Mar 26 03:04:58 UTC 2025.
-Universal Time is now:  Wed Mar 26 03:04:58 UTC 2025.
+Local time is now:      Tue Apr 28 09:29:22 UTC 2026.
+Universal Time is now:  Tue Apr 28 09:29:22 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20240727.1) ...
@@ -550,7 +582,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/rust-flate2-1.1.0/ && 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  > ../rust-flate2_1.1.0-1_source.changes
+I: user script /srv/workspace/pbuilder/3585727/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/3585727/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/rust-flate2-1.1.0/ && 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  > ../rust-flate2_1.1.0-1_source.changes
 dpkg-buildpackage: info: source package rust-flate2
 dpkg-buildpackage: info: source version 1.1.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -580,8 +616,8 @@
 debian cargo wrapper: rust_type = aarch64-unknown-linux-gnu, gnu_type = aarch64-linux-gnu
 debian cargo wrapper: running subprocess (['env', 'RUST_BACKTRACE=1', '/usr/bin/cargo', '-Zavoid-dev-deps', 'build', '--verbose', '--verbose', '-j12', '--target', 'aarch64-unknown-linux-gnu'],) {}
 warning: unused manifest key: disabled
-   Compiling cfg-if v1.0.0
    Compiling adler v1.0.2
+   Compiling cfg-if v1.0.0
      Running `CARGO=/usr/bin/cargo CARGO_CRATE_NAME=adler CARGO_MANIFEST_DIR=/build/reproducible-path/rust-flate2-1.1.0/debian/cargo_registry/adler-1.0.2 CARGO_MANIFEST_PATH=/build/reproducible-path/rust-flate2-1.1.0/debian/cargo_registry/adler-1.0.2/Cargo.toml CARGO_PKG_AUTHORS='Jonas Schievink <jonasschievink@gmail.com>' CARGO_PKG_DESCRIPTION='A simple clean-room implementation of the Adler-32 checksum' CARGO_PKG_HOMEPAGE='' CARGO_PKG_LICENSE='0BSD OR MIT OR Apache-2.0' CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=adler CARGO_PKG_README=README.md CARGO_PKG_REPOSITORY='https://github.com/jonas-schievink/adler.git' CARGO_PKG_RUST_VERSION='' CARGO_PKG_VERSION=1.0.2 CARGO_PKG_VERSION_MAJOR=1 CARGO_PKG_VERSION_MINOR=0 CARGO_PKG_VERSION_PATCH=2 CARGO_PKG_VERSION_PRE='' LD_LIBRARY_PATH=/build/reproducible-path/rust-flate2-1.1.0/target/debug/deps rustc --crate-name adler --edition=2015 /build/reproducible-path/rust-flate2-1.1.0/debian/cargo_registry/adler-1.0.2/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("compiler_builtins", "core", "default", "rustc-dep-of-std", "std"))' -C metadata=3cc16622327e59cd -C extra-filename=-919d125c2d8e01f7 --out-dir /build/reproducible-path/rust-flate2-1.1.0/target/aarch64-unknown-linux-gnu/debug/deps --target aarch64-unknown-linux-gnu -L dependency=/build/reproducible-path/rust-flate2-1.1.0/target/aarch64-unknown-linux-gnu/debug/deps -L dependency=/build/reproducible-path/rust-flate2-1.1.0/target/debug/deps --cap-lints warn -C debuginfo=2 -C strip=none --cap-lints warn -C linker=aarch64-linux-gnu-gcc -C link-arg=-Wl,-z,relro --remap-path-prefix /build/reproducible-path/rust-flate2-1.1.0=/usr/share/cargo/registry/flate2-1.1.0 --remap-path-prefix /build/reproducible-path/rust-flate2-1.1.0/debian/cargo_registry=/usr/share/cargo/registry`
      Running `CARGO=/usr/bin/cargo CARGO_CRATE_NAME=cfg_if CARGO_MANIFEST_DIR=/build/reproducible-path/rust-flate2-1.1.0/debian/cargo_registry/cfg-if-1.0.0 CARGO_MANIFEST_PATH=/build/reproducible-path/rust-flate2-1.1.0/debian/cargo_registry/cfg-if-1.0.0/Cargo.toml CARGO_PKG_AUTHORS='Alex Crichton <alex@alexcrichton.com>' CARGO_PKG_DESCRIPTION='A macro to ergonomically define an item depending on a large number of #[cfg]
 parameters. Structured like an if-else chain, the first matching branch is the
@@ -655,7 +691,7 @@
 and raw deflate streams.
 ' CARGO_PKG_HOMEPAGE='https://github.com/rust-lang/flate2-rs' CARGO_PKG_LICENSE='MIT OR Apache-2.0' CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=flate2 CARGO_PKG_README=README.md CARGO_PKG_REPOSITORY='https://github.com/rust-lang/flate2-rs' CARGO_PKG_RUST_VERSION=1.67.0 CARGO_PKG_VERSION=1.1.0 CARGO_PKG_VERSION_MAJOR=1 CARGO_PKG_VERSION_MINOR=1 CARGO_PKG_VERSION_PATCH=0 CARGO_PKG_VERSION_PRE='' CARGO_PRIMARY_PACKAGE=1 LD_LIBRARY_PATH=/build/reproducible-path/rust-flate2-1.1.0/target/debug/deps rustc --crate-name flate2 --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="any_impl"' --cfg 'feature="default"' --cfg 'feature="miniz_oxide"' --cfg 'feature="rust_backend"' --check-cfg 'cfg(docsrs,test)' --check-cfg 'cfg(feature, values("any_impl", "any_zlib", "default", "libz-sys", "miniz-sys", "miniz_oxide", "rust_backend", "zlib", "zlib-default"))' -C metadata=688a4d2cc21e705e -C extra-filename=-153da9a2b78633a9 --out-dir /build/reproducible-path/rust-flate2-1.1.0/target/aarch64-unknown-linux-gnu/debug/deps --target aarch64-unknown-linux-gnu -C incremental=/build/reproducible-path/rust-flate2-1.1.0/target/aarch64-unknown-linux-gnu/debug/incremental -L dependency=/build/reproducible-path/rust-flate2-1.1.0/target/aarch64-unknown-linux-gnu/debug/deps -L dependency=/build/reproducible-path/rust-flate2-1.1.0/target/debug/deps --extern crc32fast=/build/reproducible-path/rust-flate2-1.1.0/target/aarch64-unknown-linux-gnu/debug/deps/libcrc32fast-dc206bd9e219de32.rmeta --extern miniz_oxide=/build/reproducible-path/rust-flate2-1.1.0/target/aarch64-unknown-linux-gnu/debug/deps/libminiz_oxide-fefa841bb80ed69e.rmeta -C debuginfo=2 -C strip=none --cap-lints warn -C linker=aarch64-linux-gnu-gcc -C link-arg=-Wl,-z,relro --remap-path-prefix /build/reproducible-path/rust-flate2-1.1.0=/usr/share/cargo/registry/flate2-1.1.0 --remap-path-prefix /build/reproducible-path/rust-flate2-1.1.0/debian/cargo_registry=/usr/share/cargo/registry`
 warning: `miniz_oxide` (lib) generated 5 warnings
-    Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.78s
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.34s
 librust-adler-dev:arm64 1.0.2-2+b2 0
 librust-cfg-if-dev:arm64 1.0.0-1+b2 0
 librust-crc32fast-dev:arm64 1.4.2-1 0
@@ -691,12 +727,14 @@
 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/3585727/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3585727/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/3082896 and its subdirectories
-I: Current time: Tue Mar 25 15:05:22 -12 2025
-I: pbuilder-time-stamp: 1742958322
+I: removing directory /srv/workspace/pbuilder/3585727 and its subdirectories
+I: Current time: Tue Apr 28 23:29:49 +14 2026
+I: pbuilder-time-stamp: 1777368589