Diff of the two buildlogs:

--
--- b1/build.log	2024-11-11 22:28:25.265280738 +0000
+++ b2/build.log	2024-11-11 22:32:20.712906338 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Dec 14 16:50:46 -12 2025
-I: pbuilder-time-stamp: 1765774246
+I: Current time: Tue Nov 12 12:28:28 +14 2024
+I: pbuilder-time-stamp: 1731364108
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -28,52 +28,84 @@
 dpkg-source: info: applying disable_mtune_native.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/259331/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3237139/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos11-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 Nov 11 22:28 /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/3237139/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3237139/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]="32" [3]="1" [4]="release" [5]="x86_64-pc-linux-gnu")
+  BASH_VERSION='5.2.32(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='852b4cfcd0424265a5cbd0af53a85ee3'
-  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='259331'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=1e5ded6ea4eb4cb58618c600c939cc33
+  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=3237139
   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.lknSAW8b/pbuilderrc_23HK --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.lknSAW8b/b1 --logfile b1/build.log mptp_0.2.5-1.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://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.lknSAW8b/pbuilderrc_TuiO --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.lknSAW8b/b2 --logfile b2/build.log mptp_0.2.5-1.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://46.16.76.132:3128
 I: uname -a
-  Linux ionos5-amd64 6.10.11+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.10.11-1~bpo12+1 (2024-10-03) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-27-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.115-1 (2024-11-01) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Aug  4  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/259331/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Aug  4 21:30 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3237139/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -157,7 +189,7 @@
 Get: 36 http://deb.debian.org/debian unstable/main amd64 libpkgconf3 amd64 1.8.1-4 [36.4 kB]
 Get: 37 http://deb.debian.org/debian unstable/main amd64 pkgconf-bin amd64 1.8.1-4 [30.2 kB]
 Get: 38 http://deb.debian.org/debian unstable/main amd64 pkgconf amd64 1.8.1-4 [26.2 kB]
-Fetched 24.2 MB in 2s (9837 kB/s)
+Fetched 24.2 MB in 2s (14.2 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package m4.
 (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 ... 19969 files and directories currently installed.)
@@ -325,7 +357,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/mptp-0.2.5/ && 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  > ../mptp_0.2.5-1_source.changes
+I: user script /srv/workspace/pbuilder/3237139/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/3237139/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/mptp-0.2.5/ && 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  > ../mptp_0.2.5-1_source.changes
 dpkg-buildpackage: info: source package mptp
 dpkg-buildpackage: info: source version 0.2.5-1
 dpkg-buildpackage: info: source distribution unstable
@@ -483,7 +519,7 @@
 gcc -DHAVE_CONFIG_H -I. -I..   -Wdate-time -D_FORTIFY_SOURCE=2 -I. -O3 -Wall -Wsign-compare -g -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/mptp-0.2.5=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c -o utree.o utree.c
 gcc -DHAVE_CONFIG_H -I. -I..   -Wdate-time -D_FORTIFY_SOURCE=2 -I. -O3 -Wall -Wsign-compare -g -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/mptp-0.2.5=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c -o hash.o hash.c
 gcc -DHAVE_CONFIG_H -I. -I..   -Wdate-time -D_FORTIFY_SOURCE=2 -I. -O3 -Wall -Wsign-compare -g -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/mptp-0.2.5=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c -o list.o list.c
-/bin/bash ../ylwrap parse_utree.y y.tab.c parse_utree.c y.tab.h `echo parse_utree.c | sed -e s/cc$/hh/ -e s/cpp$/hpp/ -e s/cxx$/hxx/ -e s/c++$/h++/ -e s/c$/h/` y.output parse_utree.output -- bison -y -d -p `/usr/bin/sed -n 's/.*_\(.*\)/\1_/p' <<<"parse_utree"` 
+/bin/sh ../ylwrap parse_utree.y y.tab.c parse_utree.c y.tab.h `echo parse_utree.c | sed -e s/cc$/hh/ -e s/cpp$/hpp/ -e s/cxx$/hxx/ -e s/c++$/h++/ -e s/c$/h/` y.output parse_utree.output -- bison -y -d -p `/usr/bin/sed -n 's/.*_\(.*\)/\1_/p' <<<"parse_utree"` 
 /build/reproducible-path/mptp-0.2.5/src/parse_utree.y:84.1-14: warning: POSIX Yacc does not support %error-verbose [-Wyacc]
    84 | %error-verbose
       | ^~~~~~~~~~~~~~
@@ -497,13 +533,13 @@
 /build/reproducible-path/mptp-0.2.5/src/parse_utree.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
 updating parse_utree.h
 gcc -DHAVE_CONFIG_H -I. -I..   -Wdate-time -D_FORTIFY_SOURCE=2 -I. -O3 -Wall -Wsign-compare -g -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/mptp-0.2.5=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c -o parse_utree.o parse_utree.c
-/bin/bash ../ylwrap lex_utree.l lex.yy.c lex_utree.c -- flex -o lex.yy.c 
+/bin/sh ../ylwrap lex_utree.l lex.yy.c lex_utree.c -- flex -o lex.yy.c 
 gcc -DHAVE_CONFIG_H -I. -I..   -Wdate-time -D_FORTIFY_SOURCE=2 -I. -O3 -Wall -Wsign-compare -g -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/mptp-0.2.5=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c -o lex_utree.o lex_utree.c
 rm -f libparse_utree.a
 ar cru libparse_utree.a parse_utree.o lex_utree.o 
 ar: `u' modifier ignored since `D' is the default (see `U')
 ranlib libparse_utree.a
-/bin/bash ../ylwrap parse_rtree.y y.tab.c parse_rtree.c y.tab.h `echo parse_rtree.c | sed -e s/cc$/hh/ -e s/cpp$/hpp/ -e s/cxx$/hxx/ -e s/c++$/h++/ -e s/c$/h/` y.output parse_rtree.output -- bison -y -d -p `/usr/bin/sed -n 's/.*_\(.*\)/\1_/p' <<<"parse_rtree"` 
+/bin/sh ../ylwrap parse_rtree.y y.tab.c parse_rtree.c y.tab.h `echo parse_rtree.c | sed -e s/cc$/hh/ -e s/cpp$/hpp/ -e s/cxx$/hxx/ -e s/c++$/h++/ -e s/c$/h/` y.output parse_rtree.output -- bison -y -d -p `/usr/bin/sed -n 's/.*_\(.*\)/\1_/p' <<<"parse_rtree"` 
 /build/reproducible-path/mptp-0.2.5/src/parse_rtree.y:56.1-14: warning: POSIX Yacc does not support %error-verbose [-Wyacc]
    56 | %error-verbose
       | ^~~~~~~~~~~~~~
@@ -526,7 +562,7 @@
 /build/reproducible-path/mptp-0.2.5/src/parse_rtree.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
 updating parse_rtree.h
 gcc -DHAVE_CONFIG_H -I. -I..   -Wdate-time -D_FORTIFY_SOURCE=2 -I. -O3 -Wall -Wsign-compare -g -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/mptp-0.2.5=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c -o parse_rtree.o parse_rtree.c
-/bin/bash ../ylwrap lex_rtree.l lex.yy.c lex_rtree.c -- flex -o lex.yy.c 
+/bin/sh ../ylwrap lex_rtree.l lex.yy.c lex_rtree.c -- flex -o lex.yy.c 
 gcc -DHAVE_CONFIG_H -I. -I..   -Wdate-time -D_FORTIFY_SOURCE=2 -I. -O3 -Wall -Wsign-compare -g -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/mptp-0.2.5=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c -o lex_rtree.o lex_rtree.c
 rm -f libparse_rtree.a
 ar cru libparse_rtree.a parse_rtree.o lex_rtree.o 
@@ -548,7 +584,7 @@
 make[2]: Leaving directory '/build/reproducible-path/mptp-0.2.5'
 make[1]: Leaving directory '/build/reproducible-path/mptp-0.2.5'
    dh_auto_test
-	make -j42 check "TESTSUITEFLAGS=-j42 --verbose" VERBOSE=1
+	make -j20 check "TESTSUITEFLAGS=-j20 --verbose" VERBOSE=1
 make[1]: Entering directory '/build/reproducible-path/mptp-0.2.5'
 Making check in src
 make[2]: Entering directory '/build/reproducible-path/mptp-0.2.5/src'
@@ -572,7 +608,7 @@
 sed -i 's/Supress/Suppress/' man/mptp.1
 sed -i 's/conjuction/conjunction/' man/mptp.1
 dh_auto_install
-	make -j42 install DESTDIR=/build/reproducible-path/mptp-0.2.5/debian/mptp AM_UPDATE_INFO_DIR=no
+	make -j20 install DESTDIR=/build/reproducible-path/mptp-0.2.5/debian/mptp AM_UPDATE_INFO_DIR=no
 make[2]: Entering directory '/build/reproducible-path/mptp-0.2.5'
 Making install in src
 make[3]: Entering directory '/build/reproducible-path/mptp-0.2.5/src'
@@ -624,8 +660,8 @@
    dh_gencontrol
    dh_md5sums
    dh_builddeb
-dpkg-deb: building package 'mptp' in '../mptp_0.2.5-1_amd64.deb'.
 dpkg-deb: building package 'mptp-dbgsym' in '../mptp-dbgsym_0.2.5-1_amd64.deb'.
+dpkg-deb: building package 'mptp' in '../mptp_0.2.5-1_amd64.deb'.
  dpkg-genbuildinfo --build=binary -O../mptp_0.2.5-1_amd64.buildinfo
  dpkg-genchanges --build=binary -O../mptp_0.2.5-1_amd64.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -633,12 +669,14 @@
 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/3237139/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3237139/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/259331 and its subdirectories
-I: Current time: Sun Dec 14 16:51:24 -12 2025
-I: pbuilder-time-stamp: 1765774284
+I: removing directory /srv/workspace/pbuilder/3237139 and its subdirectories
+I: Current time: Tue Nov 12 12:32:19 +14 2024
+I: pbuilder-time-stamp: 1731364339