Diff of the two buildlogs:

--
--- b1/build.log	2025-02-26 21:17:11.928490035 +0000
+++ b2/build.log	2025-02-26 22:14:44.100490757 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Mar 31 15:35:13 -12 2026
-I: pbuilder-time-stamp: 1775014513
+I: Current time: Thu Feb 27 11:17:14 +14 2025
+I: pbuilder-time-stamp: 1740604634
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking mathcomp-algebra-tactics_1.2.4-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/736050/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/702907/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 Feb 26 21:17 /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/702907/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/702907/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='trixie'
-  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=20 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='9bdb1571c11a475cb861b2050f2cf721'
-  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='736050'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=53aa007fe58d4ea784b8686499883b51
+  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=702907
   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.MXiMNclZ/pbuilderrc_xyi5 --distribution trixie --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.MXiMNclZ/b1 --logfile b1/build.log mathcomp-algebra-tactics_1.2.4-1.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.MXiMNclZ/pbuilderrc_91EB --distribution trixie --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.MXiMNclZ/b2 --logfile b2/build.log mathcomp-algebra-tactics_1.2.4-1.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 ionos15-amd64 6.12.9+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.9-1~bpo12+1 (2025-01-19) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-31-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.128-1 (2025-02-07) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/736050/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/702907/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -202,7 +234,7 @@
 Get: 83 http://deb.debian.org/debian trixie/main amd64 libcoq-mathcomp-fingroup amd64 2.3.0-1+b5 [2300 kB]
 Get: 84 http://deb.debian.org/debian trixie/main amd64 libcoq-mathcomp-algebra amd64 2.3.0-1+b5 [12.0 MB]
 Get: 85 http://deb.debian.org/debian trixie/main amd64 libcoq-mathcomp-zify amd64 1.5.0+2.0+8.16-4+b5 [273 kB]
-Fetched 386 MB in 11s (35.8 MB/s)
+Fetched 386 MB in 42s (9295 kB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.13-minimal:amd64.
 (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
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(Reading database ... 20%
(Reading database ... 25%
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(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 ... 19799 files and directories currently installed.)
@@ -488,8 +520,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Wed Apr  1 03:36:02 UTC 2026.
-Universal Time is now:  Wed Apr  1 03:36:02 UTC 2026.
+Local time is now:      Wed Feb 26 21:23:45 UTC 2025.
+Universal Time is now:  Wed Feb 26 21:23:45 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -569,7 +601,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/mathcomp-algebra-tactics-1.2.4/ && 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  > ../mathcomp-algebra-tactics_1.2.4-1_source.changes
+I: user script /srv/workspace/pbuilder/702907/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/702907/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/mathcomp-algebra-tactics-1.2.4/ && 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  > ../mathcomp-algebra-tactics_1.2.4-1_source.changes
 dpkg-buildpackage: info: source package mathcomp-algebra-tactics
 dpkg-buildpackage: info: source version 1.2.4-1
 dpkg-buildpackage: info: source distribution unstable
@@ -967,22 +1003,22 @@
 New coercion path [GRing.divalg_closedBdiv; GRing.divring_closedBM] : GRing.divalg_closed >-> GRing.subring_closed is ambiguous with existing 
 [GRing.divalg_closedZ; GRing.subalg_closedBM] : GRing.divalg_closed >-> GRing.subring_closed.
 [ambiguous-paths,coercions,default]
-Reification: 0.004582 sec.
-Reflection: 0.003433 sec.
+Reification: 0.116672 sec.
+Reflection: 0.077806 sec.
 File "./examples/ring_examples_check.v", line 4, characters 0-23:
 Warning: To avoid stack overflow, large numbers in nat are interpreted as
 applications of Nat.of_num_uint. [abstract-large-number,numbers,default]
-Finished transaction in 0.006 secs (0.006u,0.s) (successful)
+Finished transaction in 0.133 secs (0.016u,0.s) (successful)
 File "./examples/ring_examples_check.v", line 4, characters 0-23:
 Warning: To avoid stack overflow, large numbers in nat are interpreted as
 applications of Nat.of_num_uint. [abstract-large-number,numbers,default]
-Finished transaction in 0.005 secs (0.005u,0.s) (successful)
-Finished transaction in 0.005 secs (0.005u,0.s) (successful)
+Finished transaction in 0.131 secs (0.015u,0.s) (successful)
+Finished transaction in 0.174 secs (0.013u,0.s) (successful)
 File "./examples/ring_examples_check.v", line 4, characters 0-23:
 Warning: To avoid stack overflow, large numbers in nat are interpreted as
 applications of Nat.of_num_uint. [abstract-large-number,numbers,default]
-Finished transaction in 0.005 secs (0.005u,0.s) (successful)
-Finished transaction in 0.029 secs (0.029u,0.s) (successful)
+Finished transaction in 0.172 secs (0.016u,0.s) (successful)
+Finished transaction in 0.444 secs (0.086u,0.s) (successful)
 COQC examples/ring_examples_no_check.v
 File "./examples/ring_examples_no_check.v", line 1, characters 0-68:
 Warning:
@@ -1016,22 +1052,22 @@
 New coercion path [GRing.divalg_closedBdiv; GRing.divring_closedBM] : GRing.divalg_closed >-> GRing.subring_closed is ambiguous with existing 
 [GRing.divalg_closedZ; GRing.subalg_closedBM] : GRing.divalg_closed >-> GRing.subring_closed.
 [ambiguous-paths,coercions,default]
-Reification: 0.009008 sec.
-Reflection: 0.002905 sec.
+Reification: 0.217791 sec.
+Reflection: 0.079290 sec.
 File "./examples/ring_examples_no_check.v", line 6, characters 0-23:
 Warning: To avoid stack overflow, large numbers in nat are interpreted as
 applications of Nat.of_num_uint. [abstract-large-number,numbers,default]
-Finished transaction in 0.006 secs (0.006u,0.s) (successful)
+Finished transaction in 0.119 secs (0.015u,0.s) (successful)
 File "./examples/ring_examples_no_check.v", line 6, characters 0-23:
 Warning: To avoid stack overflow, large numbers in nat are interpreted as
 applications of Nat.of_num_uint. [abstract-large-number,numbers,default]
-Finished transaction in 0.005 secs (0.005u,0.s) (successful)
-Finished transaction in 0.005 secs (0.005u,0.s) (successful)
+Finished transaction in 0.114 secs (0.013u,0.s) (successful)
+Finished transaction in 0.091 secs (0.011u,0.s) (successful)
 File "./examples/ring_examples_no_check.v", line 6, characters 0-23:
 Warning: To avoid stack overflow, large numbers in nat are interpreted as
 applications of Nat.of_num_uint. [abstract-large-number,numbers,default]
-Finished transaction in 0.005 secs (0.005u,0.s) (successful)
-Finished transaction in 0.024 secs (0.024u,0.s) (successful)
+Finished transaction in 0.111 secs (0.015u,0.s) (successful)
+Finished transaction in 0.492 secs (0.068u,0.s) (successful)
 COQC examples/from_sander.v
 File "./examples/from_sander.v", line 1, characters 0-68:
 Warning:
@@ -1065,18 +1101,18 @@
 New coercion path [GRing.divalg_closedBdiv; GRing.divring_closedBM] : GRing.divalg_closed >-> GRing.subring_closed is ambiguous with existing 
 [GRing.divalg_closedZ; GRing.subalg_closedBM] : GRing.divalg_closed >-> GRing.subring_closed.
 [ambiguous-paths,coercions,default]
-Finished transaction in 7.214 secs (7.132u,0.079s) (successful)
-Finished transaction in 1.651 secs (1.595u,0.055s) (successful)
-Finished transaction in 6.351 secs (6.259u,0.084s) (successful)
-Finished transaction in 1.403 secs (1.383u,0.019s) (successful)
-Finished transaction in 6.126 secs (6.033u,0.091s) (successful)
-Finished transaction in 1.428 secs (1.395u,0.032s) (successful)
-Finished transaction in 6.395 secs (6.319u,0.074s) (successful)
-Finished transaction in 1.831 secs (1.81u,0.019s) (successful)
-Finished transaction in 5.635 secs (5.53u,0.103s) (successful)
-Finished transaction in 1.41 secs (1.397u,0.012s) (successful)
-Finished transaction in 5.689 secs (5.664u,0.019s) (successful)
-Finished transaction in 1.541 secs (1.536u,0.s) (successful)
+Finished transaction in 154.962 secs (21.24u,0.352s) (successful)
+Finished transaction in 42.989 secs (4.201u,0.102s) (successful)
+Finished transaction in 157.861 secs (17.54u,0.294s) (successful)
+Finished transaction in 39.781 secs (4.031u,0.06s) (successful)
+Finished transaction in 175.627 secs (17.905u,0.3s) (successful)
+Finished transaction in 38.043 secs (4.02u,0.103s) (successful)
+Finished transaction in 154.996 secs (17.456u,0.185s) (successful)
+Finished transaction in 39.415 secs (4.69u,0.05s) (successful)
+Finished transaction in 155.456 secs (16.599u,0.216s) (successful)
+Finished transaction in 36.754 secs (3.985u,0.018s) (successful)
+Finished transaction in 146.88 secs (16.716u,0.048s) (successful)
+Finished transaction in 38.713 secs (4.276u,0.s) (successful)
 COQC examples/lra_examples.v
 File "./examples/lra_examples.v", line 1, characters 0-68:
 Warning:
@@ -1173,12 +1209,14 @@
 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/702907/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/702907/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/736050 and its subdirectories
-I: Current time: Tue Mar 31 15:40:11 -12 2026
-I: pbuilder-time-stamp: 1775014811
+I: removing directory /srv/workspace/pbuilder/702907 and its subdirectories
+I: Current time: Thu Feb 27 12:14:43 +14 2025
+I: pbuilder-time-stamp: 1740608083