Diff of the two buildlogs:

--
--- b1/build.log	2024-12-15 10:03:19.619103926 +0000
+++ b2/build.log	2024-12-15 10:03:51.477645179 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Dec 14 22:01:36 -12 2024
-I: pbuilder-time-stamp: 1734256896
+I: Current time: Sun Jan 18 06:26:21 +14 2026
+I: pbuilder-time-stamp: 1768667181
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -24,52 +24,84 @@
 dpkg-source: info: unpacking jetring_0.32.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1839470/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/147885/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos15-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 Jan 17 16:26 /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/147885/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/147885/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='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]="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=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='c737bdcc8f3a4219830f25775c423312'
-  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='1839470'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=30d21713cb3c42efad7c5ccba8c28f0e
+  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=147885
   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.13hgLMcX/pbuilderrc_mqNh --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.13hgLMcX/b1 --logfile b1/build.log jetring_0.32.dsc'
-  SUDO_GID='110'
-  SUDO_UID='105'
-  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.13hgLMcX/pbuilderrc_CSiq --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.13hgLMcX/b2 --logfile b2/build.log jetring_0.32.dsc'
+  SUDO_GID=111
+  SUDO_UID=106
+  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 ionos1-amd64 6.1.0-28-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.119-1 (2024-11-22) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.11.5+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.11.5-1~bpo12+1 (2024-11-11) 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/1839470/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/147885/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -152,7 +184,7 @@
 Get: 43 http://deb.debian.org/debian unstable/main amd64 gpg-agent amd64 2.2.45-2 [251 kB]
 Get: 44 http://deb.debian.org/debian unstable/main amd64 gpgsm amd64 2.2.45-2 [255 kB]
 Get: 45 http://deb.debian.org/debian unstable/main amd64 gnupg all 2.2.45-2 [376 kB]
-Fetched 23.2 MB in 6s (3874 kB/s)
+Fetched 23.2 MB in 0s (134 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package readline-common.
 (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 ... 19965 files and directories currently installed.)
@@ -351,7 +383,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/jetring-0.32/ && 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  > ../jetring_0.32_source.changes
+I: user script /srv/workspace/pbuilder/147885/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/147885/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/jetring-0.32/ && 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  > ../jetring_0.32_source.changes
 dpkg-buildpackage: info: source package jetring
 dpkg-buildpackage: info: source version 0.32
 dpkg-buildpackage: info: source distribution unstable
@@ -361,7 +397,7 @@
  debian/rules clean
 dh clean
    dh_auto_clean
-	make -j20 clean
+	make -j42 clean
 make[1]: Entering directory '/build/reproducible-path/jetring-0.32'
 make -C example clean
 make[2]: Entering directory '/build/reproducible-path/jetring-0.32'
@@ -376,7 +412,7 @@
    dh_autoreconf
    dh_auto_configure
    dh_auto_build
-	make -j20 "INSTALL=install --strip-program=true"
+	make -j42 "INSTALL=install --strip-program=true"
 make[1]: Entering directory '/build/reproducible-path/jetring-0.32'
 make -C example build
 make[2]: Entering directory '/build/reproducible-path/jetring-0.32'
@@ -384,7 +420,7 @@
 jetring-build -I debian-maintainers.gpg debian-maintainers
 gpg: Signature made Wed May  6 23:23:30 2009 
 gpg:                using DSA key DADA79CD788A3F4C
-gpg: /tmp/jetring.G1bOaAgO/trustdb.gpg: trustdb created
+gpg: /tmp/jetring.zaWiLYWP/trustdb.gpg: trustdb created
 gpg: Good signature from "Joey Hess <joeyh@debian.org>" [unknown]
 gpg:                 aka "Joey Hess <joey@kitenet.net>" [unknown]
 gpg:                 aka "Joey Hess <joeyh@master.debian.org>" [unknown]
@@ -395,7 +431,7 @@
 gpg --import 
 gpg: key 5072D036AC583520: 2 duplicate signatures removed
 gpg: key 5072D036AC583520: 1215 signatures not checked due to missing keys
-gpg: /tmp/jetring.M8Q1k0ZdB4/trustdb.gpg: trustdb created
+gpg: /tmp/jetring.B6aEAbTzC3/trustdb.gpg: trustdb created
 gpg: key 5072D036AC583520: public key "Holger Levsen <holger@layer-acht.org>" imported
 gpg: Total number processed: 1
 gpg:               imported: 1
@@ -404,7 +440,7 @@
 Applying debian-maintainers/add-fabo ...
 gpg --import 
 gpg: key 8CF535F66AA572F7: 20 signatures not checked due to missing keys
-gpg: /tmp/jetring.vXrOJegSyD/trustdb.gpg: trustdb created
+gpg: /tmp/jetring.l7DJJG_RrY/trustdb.gpg: trustdb created
 gpg: key 8CF535F66AA572F7: public key "Fathi Boudra <fboudra@free.fr>" imported
 gpg: Total number processed: 1
 gpg:               imported: 1
@@ -413,7 +449,7 @@
 Applying debian-maintainers/del-holger ...
 gpg --delete-key 5072D036AC583520
 >> y
-gpg: /tmp/jetring.W7DsLXd4Sz/trustdb.gpg: trustdb created
+gpg: /tmp/jetring.jsUjILbLko/trustdb.gpg: trustdb created
 gpg operation complete
 
 All changesets applied ok.
@@ -423,7 +459,7 @@
    create-stamp debian/debhelper-build-stamp
    dh_prep
    dh_auto_install --destdir=debian/jetring/
-	make -j20 install DESTDIR=/build/reproducible-path/jetring-0.32/debian/jetring AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true"
+	make -j42 install DESTDIR=/build/reproducible-path/jetring-0.32/debian/jetring AM_UPDATE_INFO_DIR=no "INSTALL=install --strip-program=true"
 make[1]: Entering directory '/build/reproducible-path/jetring-0.32'
 install -d /build/reproducible-path/jetring-0.32/debian/jetring/usr/bin/
 install jetring-accept jetring-apply jetring-build jetring-diff jetring-explode jetring-gen jetring-review jetring-signindex jetring-checksum /build/reproducible-path/jetring-0.32/debian/jetring/usr/bin/
@@ -456,12 +492,14 @@
 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/147885/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/147885/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/1839470 and its subdirectories
-I: Current time: Sat Dec 14 22:03:17 -12 2024
-I: pbuilder-time-stamp: 1734256997
+I: removing directory /srv/workspace/pbuilder/147885 and its subdirectories
+I: Current time: Sun Jan 18 06:26:50 +14 2026
+I: pbuilder-time-stamp: 1768667210