Diff of the two buildlogs:

--
--- b1/build.log	2024-04-25 23:38:44.516820504 +0000
+++ b2/build.log	2024-04-25 23:39:56.437754240 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Apr 25 11:33:53 -12 2024
-I: pbuilder-time-stamp: 1714088033
+I: Current time: Thu May 29 20:01:47 +14 2025
+I: pbuilder-time-stamp: 1748498507
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking rust-termios_0.3.3-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2388486/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1743891/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 May 29 06:01 /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/1743891/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1743891/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]="21" [3]="1" [4]="release" [5]="x86_64-pc-linux-gnu")
+  BASH_VERSION='5.2.21(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='101fad8de2e0466dbd1fc57337e21263'
-  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='2388486'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=faae5cd046674b8a96eacbebb9ad7bbf
+  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=1743891
   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.7ctMPEQI/pbuilderrc_mUeB --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.7ctMPEQI/b1 --logfile b1/build.log rust-termios_0.3.3-1.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.7ctMPEQI/pbuilderrc_fgkZ --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.7ctMPEQI/b2 --logfile b2/build.log rust-termios_0.3.3-1.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 6.1.0-20-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.85-1 (2024-04-11) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Apr 22 12:43 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/2388486/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 25 19:07 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/1743891/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -243,7 +275,7 @@
 Get: 69 http://deb.debian.org/debian trixie/main amd64 debhelper all 13.15.3 [901 kB]
 Get: 70 http://deb.debian.org/debian trixie/main amd64 dh-cargo all 31 [10.3 kB]
 Get: 71 http://deb.debian.org/debian trixie/main amd64 librust-libc-dev amd64 0.2.153-1 [340 kB]
-Fetched 127 MB in 16s (8013 kB/s)
+Fetched 127 MB in 2s (68.9 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 dpkg: libnettle8:amd64: dependency problems, but removing anyway as you requested:
  libhogweed6:amd64 depends on libnettle8.
@@ -519,8 +551,8 @@
 Setting up tzdata (2024a-3) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Thu Apr 25 23:37:26 UTC 2024.
-Universal Time is now:  Thu Apr 25 23:37:26 UTC 2024.
+Local time is now:      Thu May 29 06:02:43 UTC 2025.
+Universal Time is now:  Thu May 29 06:02:43 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -580,7 +612,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/rust-termios-0.3.3/ && 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-termios_0.3.3-1_source.changes
+I: user script /srv/workspace/pbuilder/1743891/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/1743891/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/rust-termios-0.3.3/ && 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-termios_0.3.3-1_source.changes
 dpkg-buildpackage: info: source package rust-termios
 dpkg-buildpackage: info: source version 0.3.3-1
 dpkg-buildpackage: info: source distribution unstable
@@ -590,7 +626,7 @@
  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'] 0
+debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=42'] [] ['-j42'] 0
 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}
    dh_autoreconf_clean -O--buildsystem=cargo
@@ -600,16 +636,16 @@
    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'] 0
+debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=42'] [] ['-j42'] 0
 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-termios-0.3.3/debian/cargo_registry/
    dh_auto_build -O--buildsystem=cargo
    debian/rules override_dh_auto_test
 make[1]: Entering directory '/build/reproducible-path/rust-termios-0.3.3'
 dh_auto_test -- test --all
-debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=20'] [] ['-j20'] 0
+debian cargo wrapper: options, profiles, parallel, lto: ['buildinfo=+all', 'reproducible=+all', 'parallel=42'] [] ['-j42'] 0
 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', 'test', '--verbose', '--verbose', '-j20', '--target', 'x86_64-unknown-linux-gnu', '--all'],) {}
+debian cargo wrapper: running subprocess (['env', 'RUST_BACKTRACE=1', '/usr/bin/cargo', '-Zavoid-dev-deps', 'test', '--verbose', '--verbose', '-j42', '--target', 'x86_64-unknown-linux-gnu', '--all'],) {}
    Compiling libc v0.2.153
      Running `CARGO=/usr/bin/cargo CARGO_CRATE_NAME=build_script_build CARGO_MANIFEST_DIR=/build/reproducible-path/rust-termios-0.3.3/debian/cargo_registry/libc-0.2.153 CARGO_PKG_AUTHORS='The Rust Project Developers' CARGO_PKG_DESCRIPTION='Raw FFI bindings to platform libraries like libc.
 ' CARGO_PKG_HOMEPAGE='https://github.com/rust-lang/libc' CARGO_PKG_LICENSE='MIT OR Apache-2.0' CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=libc CARGO_PKG_REPOSITORY='https://github.com/rust-lang/libc' CARGO_PKG_RUST_VERSION='' CARGO_PKG_VERSION=0.2.153 CARGO_PKG_VERSION_MAJOR=0 CARGO_PKG_VERSION_MINOR=2 CARGO_PKG_VERSION_PATCH=153 CARGO_PKG_VERSION_PRE='' LD_LIBRARY_PATH='/build/reproducible-path/rust-termios-0.3.3/target/debug/deps:/usr/lib' rustc --crate-name build_script_build /build/reproducible-path/rust-termios-0.3.3/debian/cargo_registry/libc-0.2.153/build.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=d827e89eab0a3baf -C extra-filename=-d827e89eab0a3baf --out-dir /build/reproducible-path/rust-termios-0.3.3/target/debug/build/libc-d827e89eab0a3baf -L dependency=/build/reproducible-path/rust-termios-0.3.3/target/debug/deps --cap-lints warn`
@@ -665,7 +701,7 @@
 
 warning: `termios` (lib) generated 2 warnings
 warning: `termios` (lib test) generated 2 warnings (2 duplicates)
-    Finished test [unoptimized + debuginfo] target(s) in 18.75s
+    Finished test [unoptimized + debuginfo] target(s) in 3.02s
      Running `/build/reproducible-path/rust-termios-0.3.3/target/x86_64-unknown-linux-gnu/debug/deps/termios-c2d6cd9102d71257`
 
 running 0 tests
@@ -676,18 +712,18 @@
      Running `rustdoc --crate-type lib --crate-name termios --test /build/reproducible-path/rust-termios-0.3.3/src/lib.rs --target x86_64-unknown-linux-gnu -L dependency=/build/reproducible-path/rust-termios-0.3.3/target/x86_64-unknown-linux-gnu/debug/deps -L dependency=/build/reproducible-path/rust-termios-0.3.3/target/debug/deps --extern libc=/build/reproducible-path/rust-termios-0.3.3/target/x86_64-unknown-linux-gnu/debug/deps/liblibc-7bcc970d38dc0c1a.rlib --extern termios=/build/reproducible-path/rust-termios-0.3.3/target/x86_64-unknown-linux-gnu/debug/deps/libtermios-f029d5074de4541e.rlib -C embed-bitcode=no --error-format human`
 
 running 10 tests
-test src/lib.rs - (line 44) - compile ... ok
-test src/lib.rs - (line 28) - compile ... ok
 test src/lib.rs - (line 19) - compile ... ok
-test src/lib.rs - Termios (line 162) - compile ... ok
+test src/lib.rs - (line 28) - compile ... ok
 test src/lib.rs - (line 78) - compile ... ok
+test src/lib.rs - Termios (line 162) - compile ... ok
+test src/lib.rs - (line 44) - compile ... ok
+test src/lib.rs - cfgetospeed (line 246) ... ok
 test src/lib.rs - cfsetospeed (line 331) ... ok
+test src/lib.rs - cfsetspeed (line 371) ... ok
 test src/lib.rs - cfgetispeed (line 231) ... ok
 test src/lib.rs - cfsetispeed (line 288) ... ok
-test src/lib.rs - cfgetospeed (line 246) ... ok
-test src/lib.rs - cfsetspeed (line 371) ... ok
 
-test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.83s
+test result: ok. 10 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.92s
 
 librust-libc-dev:amd64 0.2.153-1 0
 rustc 1.70.0+dfsg1-7 1
@@ -722,12 +758,14 @@
 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/1743891/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1743891/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/2388486 and its subdirectories
-I: Current time: Thu Apr 25 11:38:43 -12 2024
-I: pbuilder-time-stamp: 1714088323
+I: removing directory /srv/workspace/pbuilder/1743891 and its subdirectories
+I: Current time: Thu May 29 20:02:55 +14 2025
+I: pbuilder-time-stamp: 1748498575