Diff of the two buildlogs:

--
--- b1/build.log	2024-05-13 03:47:01.238245060 +0000
+++ b2/build.log	2024-05-13 03:58:12.425694131 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Jun 14 22:06:03 -12 2025
-I: pbuilder-time-stamp: 1749981963
+I: Current time: Mon May 13 17:47:04 +14 2024
+I: pbuilder-time-stamp: 1715572024
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking httpx_0.27.0-1.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/907525/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1135297/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos1-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 13 03:47 /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/1135297/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1135297/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=42 '
-  DISTRIBUTION='unstable'
-  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=20 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='e8ecabe2aaa045e4a25363ff882c3282'
-  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='907525'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=ad192c6ba2a143aea858041b184122df
+  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=1135297
   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.dVcADe3s/pbuilderrc_Vv4X --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.dVcADe3s/b1 --logfile b1/build.log httpx_0.27.0-1.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://213.165.73.152:3128'
+  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.dVcADe3s/pbuilderrc_VlUe --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.dVcADe3s/b2 --logfile b2/build.log httpx_0.27.0-1.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://46.16.76.132:3128
 I: uname -a
-  Linux ionos15-amd64 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Jun 14 14:05 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/907525/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 11 07:43 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/1135297/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -272,7 +304,7 @@
 Get: 110 http://deb.debian.org/debian unstable/main amd64 python3-wsproto all 1.2.0-1 [25.4 kB]
 Get: 111 http://deb.debian.org/debian unstable/main amd64 python3-uvloop amd64 0.19.0+ds1-2.1 [938 kB]
 Get: 112 http://deb.debian.org/debian unstable/main amd64 python3-uvicorn all 0.29.0-1 [46.1 kB]
-Fetched 39.5 MB in 1s (57.4 MB/s)
+Fetched 39.5 MB in 2s (21.0 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libjs-jquery.
 (Reading database ... 
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(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19699 files and directories currently installed.)
@@ -639,8 +671,8 @@
 Setting up tzdata (2024a-4) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Sun Jun 15 10:07:04 UTC 2025.
-Universal Time is now:  Sun Jun 15 10:07:04 UTC 2025.
+Local time is now:      Mon May 13 03:49:20 UTC 2024.
+Universal Time is now:  Mon May 13 03:49:20 UTC 2024.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -760,7 +792,11 @@
 fakeroot is already the newest version (1.34-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/httpx-0.27.0/ && 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  > ../httpx_0.27.0-1_source.changes
+I: user script /srv/workspace/pbuilder/1135297/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/1135297/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/httpx-0.27.0/ && 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  > ../httpx_0.27.0-1_source.changes
 dpkg-buildpackage: info: source package httpx
 dpkg-buildpackage: info: source version 0.27.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -799,7 +835,7 @@
 cachedir: .pytest_cache
 rootdir: /build/reproducible-path/httpx-0.27.0
 configfile: pyproject.toml
-plugins: cov-5.0.0, anyio-4.3.0, asyncio-0.20.3
+plugins: asyncio-0.20.3, cov-5.0.0, anyio-4.3.0
 asyncio: mode=Mode.STRICT
 collecting ... collected 728 items / 3 deselected / 725 selected
 
@@ -1531,13 +1567,13 @@
 
 =========================== short test summary info ============================
 SKIPPED [1] tests/client/test_auth.py:295: netrc files without a password are valid from Python >= 3.11
-================ 724 passed, 1 skipped, 3 deselected in 12.68s =================
+=========== 724 passed, 1 skipped, 3 deselected in 89.77s (0:01:29) ============
 ============================= test session starts ==============================
 platform linux -- Python 3.11.9, pytest-8.1.2, pluggy-1.5.0 -- /usr/bin/python3.11
 cachedir: .pytest_cache
 rootdir: /build/reproducible-path/httpx-0.27.0
 configfile: pyproject.toml
-plugins: cov-5.0.0, anyio-4.3.0, asyncio-0.20.3
+plugins: asyncio-0.20.3, cov-5.0.0, anyio-4.3.0
 asyncio: mode=Mode.STRICT
 collecting ... collected 728 items / 3 deselected / 725 selected
 
@@ -2269,7 +2305,7 @@
 
 =========================== short test summary info ============================
 SKIPPED [1] tests/client/test_auth.py:295: netrc files without a password are valid from Python >= 3.11
-================ 724 passed, 1 skipped, 3 deselected in 10.31s =================
+=========== 724 passed, 1 skipped, 3 deselected in 83.55s (0:01:23) ============
 make[1]: Leaving directory '/build/reproducible-path/httpx-0.27.0'
    create-stamp debian/debhelper-build-stamp
  fakeroot debian/rules binary
@@ -2306,12 +2342,14 @@
 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/1135297/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1135297/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/907525 and its subdirectories
-I: Current time: Sat Jun 14 22:10:00 -12 2025
-I: pbuilder-time-stamp: 1749982200
+I: removing directory /srv/workspace/pbuilder/1135297 and its subdirectories
+I: Current time: Mon May 13 17:58:11 +14 2024
+I: pbuilder-time-stamp: 1715572691