Diff of the two buildlogs:

--
--- b1/build.log	2025-02-13 12:36:13.297453366 +0000
+++ b2/build.log	2025-02-13 12:37:05.911077723 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Feb 13 00:34:42 -12 2025
-I: pbuilder-time-stamp: 1739450082
+I: Current time: Thu Mar 19 08:59:15 +14 2026
+I: pbuilder-time-stamp: 1773860355
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking rust-rgb_0.8.50-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/614447/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/190883/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos5-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 Mar 18 18:59 /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/190883/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/190883/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=20 '
-  DISTRIBUTION='trixie'
-  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]="37" [3]="1" [4]="release" [5]="x86_64-pc-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=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=42 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='0637bd6d91844d30b3743493166519ab'
-  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='614447'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=261938c12c114e3481173c9faea0954a
+  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=190883
   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.yLFTB3Z0/pbuilderrc_bjnV --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.yLFTB3Z0/b1 --logfile b1/build.log rust-rgb_0.8.50-1.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://46.16.76.132:3128'
+  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.yLFTB3Z0/pbuilderrc_kR0S --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.yLFTB3Z0/b2 --logfile b2/build.log rust-rgb_0.8.50-1.dsc'
+  SUDO_GID=110
+  SUDO_UID=105
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://213.165.73.152:3128
 I: uname -a
-  Linux ionos11-amd64 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.12.9+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.9-1~bpo12+1 (2025-01-19) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/614447/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/190883/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -193,7 +225,7 @@
 Get: 80 http://deb.debian.org/debian trixie/main amd64 librust-syn-dev amd64 2.0.96-2 [228 kB]
 Get: 81 http://deb.debian.org/debian trixie/main amd64 librust-bytemuck-derive-dev amd64 1.5.0-2+b1 [19.9 kB]
 Get: 82 http://deb.debian.org/debian trixie/main amd64 librust-bytemuck-dev amd64 1.21.0-1 [54.2 kB]
-Fetched 137 MB in 9s (15.0 MB/s)
+Fetched 137 MB in 4s (33.2 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.13-minimal:amd64.
 (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 ... 19808 files and directories currently installed.)
@@ -474,8 +506,8 @@
 Setting up tzdata (2024b-6) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Thu Feb 13 12:35:48 UTC 2025.
-Universal Time is now:  Thu Feb 13 12:35:48 UTC 2025.
+Local time is now:      Wed Mar 18 18:59:54 UTC 2026.
+Universal Time is now:  Wed Mar 18 18:59:54 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -548,7 +580,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/rust-rgb-0.8.50/ && 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-rgb_0.8.50-1_source.changes
+I: user script /srv/workspace/pbuilder/190883/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/190883/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/rust-rgb-0.8.50/ && 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-rgb_0.8.50-1_source.changes
 dpkg-buildpackage: info: source package rust-rgb
 dpkg-buildpackage: info: source version 0.8.50-1
 dpkg-buildpackage: info: source distribution unstable
@@ -558,7 +594,7 @@
  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=20'] [] ['-j20'] 
+debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=42'] [] ['-j42'] 
 debian cargo wrapper: rust_type, gnu_type: x86_64-unknown-linux-gnu, x86_64-linux-gnu
 debian cargo wrapper: running subprocess (['env', 'RUST_BACKTRACE=1', '/usr/bin/cargo', 'clean', '--verbose', '--verbose'],) {'check': True}
      Removed 0 files
@@ -569,20 +605,20 @@
    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=20'] [] ['-j20'] 
+debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=42'] [] ['-j42'] 
 debian cargo wrapper: rust_type, gnu_type: x86_64-unknown-linux-gnu, x86_64-linux-gnu
 debian cargo wrapper: linking /usr/share/cargo/registry/* into /build/reproducible-path/rust-rgb-0.8.50/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=20'] [] ['-j20'] 
+debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=42'] [] ['-j42'] 
 debian cargo wrapper: rust_type, gnu_type: x86_64-unknown-linux-gnu, x86_64-linux-gnu
-debian cargo wrapper: running subprocess (['env', 'RUST_BACKTRACE=1', '/usr/bin/cargo', '-Zavoid-dev-deps', 'build', '--verbose', '--verbose', '-j20', '--target', 'x86_64-unknown-linux-gnu'],) {}
+debian cargo wrapper: running subprocess (['env', 'RUST_BACKTRACE=1', '/usr/bin/cargo', '-Zavoid-dev-deps', 'build', '--verbose', '--verbose', '-j42', '--target', 'x86_64-unknown-linux-gnu'],) {}
    Compiling bytemuck v1.21.0
      Running `CARGO=/usr/bin/cargo CARGO_CRATE_NAME=bytemuck CARGO_MANIFEST_DIR=/build/reproducible-path/rust-rgb-0.8.50/debian/cargo_registry/bytemuck-1.21.0 CARGO_MANIFEST_PATH=/build/reproducible-path/rust-rgb-0.8.50/debian/cargo_registry/bytemuck-1.21.0/Cargo.toml CARGO_PKG_AUTHORS='Lokathor <zefria@gmail.com>' CARGO_PKG_DESCRIPTION='A crate for mucking around with piles of bytes.' CARGO_PKG_HOMEPAGE='' CARGO_PKG_LICENSE='Zlib OR Apache-2.0 OR MIT' CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=bytemuck CARGO_PKG_README=README.md CARGO_PKG_REPOSITORY='https://github.com/Lokathor/bytemuck' CARGO_PKG_RUST_VERSION='' CARGO_PKG_VERSION=1.21.0 CARGO_PKG_VERSION_MAJOR=1 CARGO_PKG_VERSION_MINOR=21 CARGO_PKG_VERSION_PATCH=0 CARGO_PKG_VERSION_PRE='' LD_LIBRARY_PATH=/build/reproducible-path/rust-rgb-0.8.50/target/debug/deps rustc --crate-name bytemuck --edition=2018 /build/reproducible-path/rust-rgb-0.8.50/debian/cargo_registry/bytemuck-1.21.0/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 --deny=unexpected_cfgs --check-cfg 'cfg(target_arch, values("spirv"))' --check-cfg 'cfg(docsrs)' --check-cfg 'cfg(feature, values("aarch64_simd", "align_offset", "alloc_uninit", "avx512_simd", "bytemuck_derive", "const_zeroed", "derive", "extern_crate_alloc", "extern_crate_std", "latest_stable_rust", "min_const_generics", "must_cast", "must_cast_extra", "nightly_docs", "nightly_float", "nightly_portable_simd", "nightly_stdsimd", "track_caller", "transparentwrapper_extra", "unsound_ptr_pod_impl", "wasm_simd", "zeroable_atomics", "zeroable_maybe_uninit"))' -C metadata=b45b6e0d7eccee74 -C extra-filename=-b45b6e0d7eccee74 --out-dir /build/reproducible-path/rust-rgb-0.8.50/target/x86_64-unknown-linux-gnu/debug/deps --target x86_64-unknown-linux-gnu -L dependency=/build/reproducible-path/rust-rgb-0.8.50/target/x86_64-unknown-linux-gnu/debug/deps -L dependency=/build/reproducible-path/rust-rgb-0.8.50/target/debug/deps --cap-lints warn -C debuginfo=2 -C strip=none --cap-lints warn -C linker=x86_64-linux-gnu-gcc -C link-arg=-Wl,-z,relro --remap-path-prefix /build/reproducible-path/rust-rgb-0.8.50=/usr/share/cargo/registry/rgb-0.8.50 --remap-path-prefix /build/reproducible-path/rust-rgb-0.8.50/debian/cargo_registry=/usr/share/cargo/registry`
    Compiling rgb v0.8.50 (/build/reproducible-path/rust-rgb-0.8.50)
      Running `CARGO=/usr/bin/cargo CARGO_CRATE_NAME=rgb CARGO_MANIFEST_DIR=/build/reproducible-path/rust-rgb-0.8.50 CARGO_MANIFEST_PATH=/build/reproducible-path/rust-rgb-0.8.50/Cargo.toml CARGO_PKG_AUTHORS='Kornel LesiƄski <kornel@geekhood.net>:James Forster <james.forsterer@gmail.com>' CARGO_PKG_DESCRIPTION='`struct RGB/RGBA/etc.` for sharing pixels between crates + convenience methods for color manipulation.
 Allows no-copy high-level interoperability. Also adds common convenience methods and implements standard Rust traits to make `RGB`/`RGBA` pixels and slices first-class Rust objects.' CARGO_PKG_HOMEPAGE='https://lib.rs/crates/rgb' CARGO_PKG_LICENSE=MIT CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=rgb CARGO_PKG_README=README.md CARGO_PKG_REPOSITORY='https://github.com/kornelski/rust-rgb' CARGO_PKG_RUST_VERSION=1.63 CARGO_PKG_VERSION=0.8.50 CARGO_PKG_VERSION_MAJOR=0 CARGO_PKG_VERSION_MINOR=8 CARGO_PKG_VERSION_PATCH=50 CARGO_PKG_VERSION_PRE='' CARGO_PRIMARY_PACKAGE=1 LD_LIBRARY_PATH=/build/reproducible-path/rust-rgb-0.8.50/target/debug/deps rustc --crate-name rgb --edition=2021 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="argb"' --cfg 'feature="as-bytes"' --cfg 'feature="bytemuck"' --cfg 'feature="default"' --cfg 'feature="grb"' --check-cfg 'cfg(docsrs)' --check-cfg 'cfg(feature, values("argb", "as-bytes", "bytemuck", "checked_fns", "default", "defmt-03", "grb", "serde", "unstable-experimental"))' -C metadata=2761a1a799e0a911 -C extra-filename=-2761a1a799e0a911 --out-dir /build/reproducible-path/rust-rgb-0.8.50/target/x86_64-unknown-linux-gnu/debug/deps --target x86_64-unknown-linux-gnu -C incremental=/build/reproducible-path/rust-rgb-0.8.50/target/x86_64-unknown-linux-gnu/debug/incremental -L dependency=/build/reproducible-path/rust-rgb-0.8.50/target/x86_64-unknown-linux-gnu/debug/deps -L dependency=/build/reproducible-path/rust-rgb-0.8.50/target/debug/deps --extern bytemuck=/build/reproducible-path/rust-rgb-0.8.50/target/x86_64-unknown-linux-gnu/debug/deps/libbytemuck-b45b6e0d7eccee74.rmeta -C debuginfo=2 -C strip=none --cap-lints warn -C linker=x86_64-linux-gnu-gcc -C link-arg=-Wl,-z,relro --remap-path-prefix /build/reproducible-path/rust-rgb-0.8.50=/usr/share/cargo/registry/rgb-0.8.50 --remap-path-prefix /build/reproducible-path/rust-rgb-0.8.50/debian/cargo_registry=/usr/share/cargo/registry`
-    Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.32s
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.44s
 librust-bytemuck-dev:amd64 1.21.0-1 0
 rustc 1.84.0+dfsg1-2 1
    create-stamp debian/debhelper-build-stamp
@@ -614,12 +650,14 @@
 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/190883/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/190883/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/614447 and its subdirectories
-I: Current time: Thu Feb 13 00:36:12 -12 2025
-I: pbuilder-time-stamp: 1739450172
+I: removing directory /srv/workspace/pbuilder/190883 and its subdirectories
+I: Current time: Thu Mar 19 09:00:05 +14 2026
+I: pbuilder-time-stamp: 1773860405