Diff of the two buildlogs:

--
--- b1/build.log	2025-02-28 01:09:36.052465345 +0000
+++ b2/build.log	2025-02-28 02:40:31.990577799 +0000
@@ -1,7 +1,6 @@
-W: cgroups are not available on the host, not using them.
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Apr  1 18:46:24 -12 2026
-I: pbuilder-time-stamp: 1775112384
+I: Current time: Fri Feb 28 15:09:48 +14 2025
+I: pbuilder-time-stamp: 1740704988
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -35,51 +34,84 @@
 dpkg-source: info: applying skip-test-on-armel.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/651584/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3628167/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink04-arm64.
+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 28 01:09 /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/3628167/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3628167/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='arm64'
-  DEBIAN_FRONTEND='noninteractive'
+  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]="aarch64-unknown-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=arm64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=12 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  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='651584'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=53d42d5402d440feba7d409c5742baa1
+  LANG=C
+  LANGUAGE=nl_BE:nl
+  LC_ALL=C
+  MACHTYPE=aarch64-unknown-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=3628167
   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.FolmRkNq/pbuilderrc_1Oft --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.FolmRkNq/b1 --logfile b1/build.log sympy_1.13.3-5.dsc'
-  SUDO_GID='109'
-  SUDO_UID='104'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/sbin/chroot'
-  http_proxy='http://192.168.101.4:3128'
+  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.FolmRkNq/pbuilderrc_rvJ0 --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.FolmRkNq/b2 --logfile b2/build.log sympy_1.13.3-5.dsc'
+  SUDO_GID=109
+  SUDO_UID=104
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://192.168.101.4:3128
 I: uname -a
-  Linux codethink03-arm64 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/651584/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3628167/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -478,7 +510,7 @@
 Get: 305 http://deb.debian.org/debian unstable/main arm64 texlive-latex-recommended all 2024.20250114-1 [8760 kB]
 Get: 306 http://deb.debian.org/debian unstable/main arm64 texlive-pictures all 2024.20250114-1 [17.1 MB]
 Get: 307 http://deb.debian.org/debian unstable/main arm64 texlive-latex-extra all 2024.20250114-1 [24.7 MB]
-Fetched 496 MB in 18s (27.5 MB/s)
+Fetched 496 MB in 9s (53.1 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libfftw3-double3:arm64.
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(Reading database ... 19893 files and directories currently installed.)
@@ -1468,8 +1500,8 @@
 Setting up tzdata (2025a-2) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Thu Apr  2 06:47:42 UTC 2026.
-Universal Time is now:  Thu Apr  2 06:47:42 UTC 2026.
+Local time is now:      Fri Feb 28 01:11:19 UTC 2025.
+Universal Time is now:  Fri Feb 28 01:11:19 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up unicode-data (15.1.0-1) ...
@@ -1793,7 +1825,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/sympy-1.13.3/ && 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  > ../sympy_1.13.3-5_source.changes
+I: user script /srv/workspace/pbuilder/3628167/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/3628167/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/sympy-1.13.3/ && 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  > ../sympy_1.13.3-5_source.changes
 dpkg-buildpackage: info: source package sympy
 dpkg-buildpackage: info: source version 1.13.3-5
 dpkg-buildpackage: info: source distribution unstable
@@ -1898,7 +1934,7 @@
 /build/reproducible-path/sympy-1.13.3/doc/src/conf.py:430: UserWarning: Failed to get the git commit hash as the command 'git rev-parse HEAD' is not working. The commit hash will be assumed as the SymPy master, but the lines may be misleading or nonexistent as it is not the correct branch the doc is built with. Check your installation of 'git' if you want to resolve this warning.
   warnings.warn(
 loading translations [en]... done
-Matplotlib created a temporary cache directory at /tmp/matplotlib-uoa3ft9l because the default path (/nonexistent/first-build/.config/matplotlib) is not a writable directory; it is highly recommended to set the MPLCONFIGDIR environment variable to a writable directory, in particular to speed up the import of Matplotlib and to better support multiprocessing.
+Matplotlib created a temporary cache directory at /tmp/matplotlib-8n1u5zzp because the default path (/nonexistent/second-build/.config/matplotlib) is not a writable directory; it is highly recommended to set the MPLCONFIGDIR environment variable to a writable directory, in particular to speed up the import of Matplotlib and to better support multiprocessing.
 Fontconfig error: No writable cache directories
 Fontconfig error: No writable cache directories
 Fontconfig error: No writable cache directories
@@ -1925,7 +1961,7 @@
 Fontconfig error: No writable cache directories
 Fontconfig error: No writable cache directories
 Converting `source_suffix = '.rst'` to `source_suffix = {'.rst': 'restructuredtext'}`.
-myst v4.0.1: MdParserConfig(commonmark_only=False, gfm_only=False, enable_extensions={'tasklist', 'linkify', 'dollarmath'}, disable_syntax=[], all_links_external=False, links_external_new_tab=False, url_schemes=('http', 'https', 'mailto', 'ftp'), ref_domains=None, fence_as_directive=set(), number_code_blocks=[], title_to_header=False, heading_anchors=6, heading_slug_func=None, html_meta={}, footnote_sort=True, footnote_transition=True, words_per_minute=200, substitutions={}, linkify_fuzzy_links=False, dmath_allow_labels=True, dmath_allow_space=True, dmath_allow_digits=True, dmath_double_inline=False, update_mathjax=True, mathjax_classes='tex2jax_process|mathjax_process|math|output_area', enable_checkboxes=False, suppress_warnings=[], highlight_code_blocks=True)
+myst v4.0.1: MdParserConfig(commonmark_only=False, gfm_only=False, enable_extensions={'linkify', 'dollarmath', 'tasklist'}, disable_syntax=[], all_links_external=False, links_external_new_tab=False, url_schemes=('http', 'https', 'mailto', 'ftp'), ref_domains=None, fence_as_directive=set(), number_code_blocks=[], title_to_header=False, heading_anchors=6, heading_slug_func=None, html_meta={}, footnote_sort=True, footnote_transition=True, words_per_minute=200, substitutions={}, linkify_fuzzy_links=False, dmath_allow_labels=True, dmath_allow_space=True, dmath_allow_digits=True, dmath_double_inline=False, update_mathjax=True, mathjax_classes='tex2jax_process|mathjax_process|math|output_area', enable_checkboxes=False, suppress_warnings=[], highlight_code_blocks=True)
 loading intersphinx inventory 'matplotlib' from /usr/share/doc/python-matplotlib-doc/html/objects.inv ...
 loading intersphinx inventory 'mpmath' from /usr/share/doc/python-mpmath-doc/html/objects.inv ...
 loading intersphinx inventory 'scipy' from /usr/share/doc/python-scipy-doc/html/objects.inv ...
@@ -1937,10 +1973,10 @@
 building [html]: targets for 309 source files that are out of date
 updating environment: [new config] 309 added, 0 changed, 0 removed
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/build/reproducible-path/sympy-1.13.3/sympy/physics/continuum_mechanics/beam.py:2382: UserWarning: Please, note that this schematic view might not be in agreement with the sign convention used by the Beam class for load-related computations, because it was not possible to determine the sign (hence, the direction) of the following loads:
-* Point load P1 located at 10
+* Moment M located at 15
 * Point load -P2 located at 40
 * Moment -M located at 30
-* Moment M located at 15
+* Point load P1 located at 10
 
   warnings.warn(warning_head + warning_body)
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/usr/lib/python3.13/importlib/__init__.py:88: SymPyDeprecationWarning: 
@@ -2026,7 +2062,7 @@
 
 Encoding error:
 'ascii' codec can't decode byte 0xe8 in position 1584: ordinal not in range(128)
-The full traceback has been saved in /tmp/sphinx-err-9fwr_f8f.log, if you want to report the issue to the developers.
+The full traceback has been saved in /tmp/sphinx-err-7vlu1fyj.log, if you want to report the issue to the developers.
 make[3]: *** [Makefile:69: _html] Error 2
 The docs build failed with the following errors:
 WARNING: failed to reach any of the inventories with the following issues:
@@ -2086,7 +2122,7 @@
 
 Encoding error:
 'ascii' codec can't decode byte 0xe8 in position 1584: ordinal not in range(128)
-The full traceback has been saved in /tmp/sphinx-err-9fwr_f8f.log, if you want to report the issue to the developers.
+The full traceback has been saved in /tmp/sphinx-err-7vlu1fyj.log, if you want to report the issue to the developers.
 make[2]: Leaving directory '/build/reproducible-path/sympy-1.13.3/doc'
 make[1]: Leaving directory '/build/reproducible-path/sympy-1.13.3'
    dh_auto_build -O--buildsystem=pybuild
@@ -4630,7 +4666,7 @@
 ../../../sympy/vector/tests/test_printing.py .x....                      [ 99%]
 ../../../sympy/vector/tests/test_vector.py .............                 [100%]
 
-= 12568 passed, 362 skipped, 214 deselected, 327 xfailed, 6 xpassed in 1890.34s (0:31:30) =
+= 12568 passed, 362 skipped, 214 deselected, 327 xfailed, 6 xpassed in 3958.49s (1:05:58) =
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=pybuild
    dh_prep -O--buildsystem=pybuild
@@ -8441,10 +8477,10 @@
 dpkg-gencontrol: warning: Depends field of package python-sympy-doc: substitution variable ${sphinxdoc:Depends} used, but is not defined
    dh_md5sums -O--buildsystem=pybuild
    dh_builddeb -O--buildsystem=pybuild
+dpkg-deb: building package 'isympy3' in '../isympy3_1.13.3-5_all.deb'.
 dpkg-deb: building package 'isympy-common' in '../isympy-common_1.13.3-5_all.deb'.
-dpkg-deb: building package 'python3-sympy' in '../python3-sympy_1.13.3-5_all.deb'.
 dpkg-deb: building package 'python-sympy-doc' in '../python-sympy-doc_1.13.3-5_all.deb'.
-dpkg-deb: building package 'isympy3' in '../isympy3_1.13.3-5_all.deb'.
+dpkg-deb: building package 'python3-sympy' in '../python3-sympy_1.13.3-5_all.deb'.
  dpkg-genbuildinfo --build=binary -O../sympy_1.13.3-5_arm64.buildinfo
  dpkg-genchanges --build=binary -O../sympy_1.13.3-5_arm64.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -8452,12 +8488,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: not including original source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/3628167/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3628167/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/651584 and its subdirectories
-I: Current time: Wed Apr  1 19:32:33 -12 2026
-I: pbuilder-time-stamp: 1775115153
+I: removing directory /srv/workspace/pbuilder/3628167 and its subdirectories
+I: Current time: Fri Feb 28 16:40:30 +14 2025
+I: pbuilder-time-stamp: 1740710430