Diff of the two buildlogs:

--
--- b1/build.log	2025-01-01 11:41:38.692302088 +0000
+++ b2/build.log	2025-01-01 11:48:46.752755314 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Dec 31 23:34:52 -12 2024
-I: pbuilder-time-stamp: 1735731292
+I: Current time: Wed Feb  4 08:04:52 +14 2026
+I: pbuilder-time-stamp: 1770141892
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -25,54 +25,86 @@
 dpkg-source: info: applying 0001-Remove-enable_if-directive.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/57592/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/65822/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos16-i386.
+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 Feb  3 18:05 /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/65822/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/65822/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='i386'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=11 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='i386'
+  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]="i686-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=i386
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=21 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=i686
+  HOST_ARCH=i386
   IFS=' 	
   '
-  INVOCATION_ID='35a454870ae64e459b1fb14c10fbb11b'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  LD_LIBRARY_PATH='/usr/lib/libeatmydata'
-  LD_PRELOAD='libeatmydata.so'
-  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='57592'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=5180203465574a0585567c05c11bc1ee
+  LANG=C
+  LANGUAGE=de_CH:de
+  LC_ALL=C
+  LD_LIBRARY_PATH=/usr/lib/libeatmydata
+  LD_PRELOAD=libeatmydata.so
+  MACHTYPE=i686-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=65822
   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.WjR6Nc5Z/pbuilderrc_yTK6 --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.WjR6Nc5Z/b1 --logfile b1/build.log ocaml-mm_0.8.6-1.dsc'
-  SUDO_GID='112'
-  SUDO_UID='107'
-  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.WjR6Nc5Z/pbuilderrc_D3ik --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.WjR6Nc5Z/b2 --logfile b2/build.log ocaml-mm_0.8.6-1.dsc'
+  SUDO_GID=112
+  SUDO_UID=107
+  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 ionos2-i386 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 6.1.0-28-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.119-1 (2024-11-22) 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/57592/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/65822/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -421,7 +453,7 @@
 Get: 151 http://deb.debian.org/debian unstable/main i386 libtheora-ocaml i386 0.4.1-1 [10.2 kB]
 Get: 152 http://deb.debian.org/debian unstable/main i386 libtheora-ocaml-dev i386 0.4.1-1 [93.2 kB]
 Get: 153 http://deb.debian.org/debian unstable/main i386 ocaml-dune i386 3.17.1-1 [1018 kB]
-Fetched 188 MB in 6s (33.9 MB/s)
+Fetched 188 MB in 6s (29.9 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.12-minimal:i386.
 (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 ... 19844 files and directories currently installed.)
@@ -932,8 +964,8 @@
 Setting up tzdata (2024b-4) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Wed Jan  1 11:37:17 UTC 2025.
-Universal Time is now:  Wed Jan  1 11:37:17 UTC 2025.
+Local time is now:      Tue Feb  3 18:07:10 UTC 2026.
+Universal Time is now:  Tue Feb  3 18:07:10 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up libsysprof-capture-4-dev:i386 (47.2-1) ...
@@ -1065,7 +1097,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/ocaml-mm-0.8.6/ && 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  > ../ocaml-mm_0.8.6-1_source.changes
+I: user script /srv/workspace/pbuilder/65822/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/65822/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/ocaml-mm-0.8.6/ && 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  > ../ocaml-mm_0.8.6-1_source.changes
 dpkg-buildpackage: info: source package ocaml-mm
 dpkg-buildpackage: info: source version 0.8.6-1
 dpkg-buildpackage: info: source distribution unstable
@@ -1086,9 +1122,9 @@
    dh_ocamlinit -O--buildsystem=ocaml_dune
    dh_auto_configure -O--buildsystem=ocaml_dune
    dh_auto_build -O--buildsystem=ocaml_dune
-	dune build -j 11 -p mm
+	dune build -j 21 -p mm
    dh_auto_test -O--buildsystem=ocaml_dune
-	dune runtest -j 11 -p mm
+	dune runtest -j 21 -p mm
 (cd _build/default/examples && ./test.exe)
 
 # Testing MM library
@@ -1102,15 +1138,15 @@
 ## Testing audio
 
 - basic functions... ok
-- adding many buffers... 94.87 s
-- u8 conversion... 12.09 s
-- s16le conversion... 13.20 s
-- s16be conversion... 12.01 s
-- s24le conversion... 14.83 s
-- s32le conversion... 12.08 s
+- adding many buffers... 50.70 s
+- u8 conversion... 8.88 s
+- s16le conversion... 6.80 s
+- s16be conversion... 7.07 s
+- s24le conversion... 7.18 s
+- s32le conversion... 7.32 s
 - s16le with offset... ok
 - generate sine... ok
-- compute replaygain... 4.85 s
+- compute replaygain... 2.75 s
 
 ## Testing images
 
@@ -1131,14 +1167,14 @@
 - color to alpha... ok
 - is_opaque... ok
 - add... ok
-- many adds... 0.54 s
+- many adds... 0.67 s
 - mean cannot clip... ok
-- many adds with alpha... 4.27 s
-- scale... 0.22 s
+- many adds with alpha... 2.80 s
+- scale... 0.10 s
 - font... ok
-- sliding font... 1.88 s
+- sliding font... 2.52 s
 - empty text... ok
-- increasing saw... 8.86 s
+- increasing saw... 6.15 s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=ocaml_dune
    dh_prep -O--buildsystem=ocaml_dune
@@ -1170,8 +1206,8 @@
 dpkg-gencontrol: warning: Depends field of package libmm-ocaml-dev: substitution variable ${shlibs:Depends} used, but is not defined
    dh_md5sums -O--buildsystem=ocaml_dune
    dh_builddeb -O--buildsystem=ocaml_dune
-dpkg-deb: building package 'libmm-ocaml-dev' in '../libmm-ocaml-dev_0.8.6-1_i386.deb'.
 dpkg-deb: building package 'libmm-ocaml-dbgsym' in '../libmm-ocaml-dbgsym_0.8.6-1_i386.deb'.
+dpkg-deb: building package 'libmm-ocaml-dev' in '../libmm-ocaml-dev_0.8.6-1_i386.deb'.
 dpkg-deb: building package 'libmm-ocaml' in '../libmm-ocaml_0.8.6-1_i386.deb'.
  dpkg-genbuildinfo --build=binary -O../ocaml-mm_0.8.6-1_i386.buildinfo
  dpkg-genchanges --build=binary -O../ocaml-mm_0.8.6-1_i386.changes
@@ -1180,12 +1216,14 @@
 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/65822/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/65822/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/57592 and its subdirectories
-I: Current time: Tue Dec 31 23:41:37 -12 2024
-I: pbuilder-time-stamp: 1735731697
+I: removing directory /srv/workspace/pbuilder/65822 and its subdirectories
+I: Current time: Wed Feb  4 08:11:36 +14 2026
+I: pbuilder-time-stamp: 1770142296