Diff of the two buildlogs:

--
--- b1/build.log	2025-02-18 12:05:44.084289552 +0000
+++ b2/build.log	2025-02-18 12:07:39.875089262 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Feb 18 00:02:23 -12 2025
-I: pbuilder-time-stamp: 1739880143
+I: Current time: Tue Mar 24 08:28:46 +14 2026
+I: pbuilder-time-stamp: 1774290526
 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: applying 0001-Add-delay-in-timer_check.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/186749/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/934519/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 Mar 23 18:28 /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/934519/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/934519/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='1cd73b57725741d1af35bc5a01aedab3'
-  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='186749'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=7bf808f4b83742dc9ce7eb4388fcbc38
+  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=934519
   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.iNMjjwoh/pbuilderrc_Msra --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.iNMjjwoh/b1 --logfile b1/build.log ocaml-mirage-crypto_2.0.0-1.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://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.iNMjjwoh/pbuilderrc_Ihdh --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.iNMjjwoh/b2 --logfile b2/build.log ocaml-mirage-crypto_2.0.0-1.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://213.165.73.152:3128
 I: uname -a
-  Linux ionos11-amd64 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.12.9+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.9-1~bpo12+1 (2025-01-19) 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/186749/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/934519/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -376,7 +408,7 @@
 Get: 118 http://deb.debian.org/debian unstable/main amd64 ocaml-dune amd64 3.17.2-1 [4834 kB]
 Get: 119 http://deb.debian.org/debian unstable/main amd64 pkgconf-bin amd64 1.8.1-4 [30.2 kB]
 Get: 120 http://deb.debian.org/debian unstable/main amd64 pkgconf amd64 1.8.1-4 [26.2 kB]
-Fetched 211 MB in 16s (12.8 MB/s)
+Fetched 211 MB in 3s (74.3 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package sensible-utils.
 (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 ... 19798 files and directories currently installed.)
@@ -871,7 +903,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/ocaml-mirage-crypto-2.0.0/ && 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  > ../ocaml-mirage-crypto_2.0.0-1_source.changes
+I: user script /srv/workspace/pbuilder/934519/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/934519/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/ocaml-mirage-crypto-2.0.0/ && 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  > ../ocaml-mirage-crypto_2.0.0-1_source.changes
 dpkg-buildpackage: info: source package ocaml-mirage-crypto
 dpkg-buildpackage: info: source version 2.0.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -892,11 +928,10 @@
    dh_ocamlinit -O--buildsystem=ocaml_dune
    dh_auto_configure -O--buildsystem=ocaml_dune
    dh_auto_build -O--buildsystem=ocaml_dune
-	dune build -j 20 -p mirage-crypto,mirage-crypto-rng,mirage-crypto-pk,mirage-crypto-ec
+	dune build -j 42 -p mirage-crypto,mirage-crypto-rng,mirage-crypto-pk,mirage-crypto-ec
    dh_auto_test -O--buildsystem=ocaml_dune
-	dune runtest -j 20 -p mirage-crypto,mirage-crypto-rng,mirage-crypto-pk,mirage-crypto-ec
+	dune runtest -j 42 -p mirage-crypto,mirage-crypto-rng,mirage-crypto-pk,mirage-crypto-ec
 (cd _build/default/tests && ./test_entropy.exe)
-no CPU RNG available
 test entropy OK
 (cd _build/default/tests && ./test_random_runner.exe)
 .........
@@ -904,7 +939,7 @@
 OK
 (cd _build/default/tests && ./test_ec.exe)
 Testing `EC'.
-This run has ID `MPSXF2PK'.
+This run has ID `P9NU962W'.
 
   [OK]          P256 Key exchange                               0   b*A.
   [OK]          P256 Key exchange                               1   a*B.
@@ -972,19 +1007,19 @@
   [OK]          ECDSA P521 regression                           0   regreesion1.
 
 Full test results in `/build/reproducible-path/ocaml-mirage-crypto-2.0.0/_build/default/tests/_build/_tests/EC'.
-Test Successful in 0.141s. 64 tests run.
+Test Successful in 0.057s. 64 tests run.
 (cd _build/default/tests && ./test_symmetric_runner.exe)
 accel: XOR AES GHASH 
 ................................................................
-Ran: 64 tests in: 0.16 seconds.
+Ran: 64 tests in: 0.13 seconds.
 OK
 (cd _build/default/tests && ./test_pk_runner.exe)
 .......................................................................................................................................................................................................................................................................................................................................................................
-Ran: 359 tests in: 4.48 seconds.
+Ran: 359 tests in: 1.59 seconds.
 OK
 (cd _build/default/tests && ./test_ec_wycheproof.exe)
 Testing `Wycheproof NIST curves'.
-This run has ID `3DZIORM8'.
+This run has ID `OKAFL8W0'.
 
   [OK]          ECDH P256 test vectors                    0   1 - normal case.
   [OK]          ECDH P256 test vectors                    1   2 - compressed ...
@@ -2000,7 +2035,7 @@
   [OK]          ED25519 test vectors                    144   145 - regressio...
 
 Full test results in `/build/reproducible-path/ocaml-mirage-crypto-2.0.0/_build/default/tests/_build/_tests/Wycheproof NIST curves'.
-Test Successful in 22.923s. 3502 tests run.
+Test Successful in 7.384s. 3502 tests run.
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=ocaml_dune
    dh_prep -O--buildsystem=ocaml_dune
@@ -2034,9 +2069,9 @@
 dpkg-gencontrol: warning: Depends field of package libmirage-crypto-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 'libmirage-crypto-ocaml-dev' in '../libmirage-crypto-ocaml-dev_2.0.0-1_amd64.deb'.
 dpkg-deb: building package 'libmirage-crypto-ocaml' in '../libmirage-crypto-ocaml_2.0.0-1_amd64.deb'.
 dpkg-deb: building package 'libmirage-crypto-ocaml-dbgsym' in '../libmirage-crypto-ocaml-dbgsym_2.0.0-1_amd64.deb'.
+dpkg-deb: building package 'libmirage-crypto-ocaml-dev' in '../libmirage-crypto-ocaml-dev_2.0.0-1_amd64.deb'.
  dpkg-genbuildinfo --build=binary -O../ocaml-mirage-crypto_2.0.0-1_amd64.buildinfo
  dpkg-genchanges --build=binary -O../ocaml-mirage-crypto_2.0.0-1_amd64.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -2044,12 +2079,14 @@
 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/934519/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/934519/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/186749 and its subdirectories
-I: Current time: Tue Feb 18 00:05:43 -12 2025
-I: pbuilder-time-stamp: 1739880343
+I: removing directory /srv/workspace/pbuilder/934519 and its subdirectories
+I: Current time: Tue Mar 24 08:30:39 +14 2026
+I: pbuilder-time-stamp: 1774290639