Diff of the two buildlogs:

--
--- b1/build.log	2024-01-09 13:48:30.977772625 +0000
+++ b2/build.log	2024-01-09 13:51:06.087283008 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Jan  9 01:45:03 -12 2024
-I: pbuilder-time-stamp: 1704807903
+I: Current time: Wed Jan 10 03:48:40 +14 2024
+I: pbuilder-time-stamp: 1704808120
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bullseye-reproducible-base.tgz]
 I: copying local configuration
@@ -17,7 +17,7 @@
 I: copying [./android-platform-external-libunwind_10.0.0+r36-4.debian.tar.xz]
 I: Extracting source
 gpgv: unknown type of key resource 'trustedkeys.kbx'
-gpgv: keyblock resource '/tmp/dpkg-verify-sig.O5yPkuwt/trustedkeys.kbx': General error
+gpgv: keyblock resource '/tmp/dpkg-verify-sig.effsspue/trustedkeys.kbx': General error
 gpgv: Signature made Tue Dec  8 10:07:39 2020 
 gpgv:                using RSA key 972239DBE68699F526C06A053E177817BA1B9BFA
 gpgv: Can't check signature: No public key
@@ -31,49 +31,80 @@
 dpkg-source: info: applying 20150704-CVE-2015-3239_dwarf_i.h.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/22577/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/4074/tmp/hooks/D01_modify_environment starting
+debug: Running on virt32b.
+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 Jan  9 13:49 /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/4074/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/4074/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='armhf'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all,-fixfilepath parallel=3 '
-  DISTRIBUTION='bullseye'
-  HOME='/root'
-  HOST_ARCH='armhf'
+  BASH=/bin/sh
+  BASHOPTS=checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:hostcomplete:interactive_comments:progcomp:promptvars:sourcepath
+  BASH_ALIASES=()
+  BASH_ARGC=()
+  BASH_ARGV=()
+  BASH_CMDS=()
+  BASH_LINENO=([0]="12" [1]="0")
+  BASH_SOURCE=([0]="/tmp/hooks/D02_print_environment" [1]="/tmp/hooks/D02_print_environment")
+  BASH_VERSINFO=([0]="5" [1]="1" [2]="4" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
+  BASH_VERSION='5.1.4(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all,-fixfilepath parallel=4 '
+  DIRSTACK=()
+  DISTRIBUTION=bullseye
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='5712eec7e46f4d8e8d9c5bad56d4288c'
-  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='22577'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=4f4e5be14d9c4ae5aedca5e258688e7f
+  LANG=C
+  LANGUAGE=it_CH:it
+  LC_ALL=C
+  MACHTYPE=arm-unknown-linux-gnueabihf
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnueabihf
+  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=4074
   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.9lDDPGcQ/pbuilderrc_O7A1 --distribution bullseye --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bullseye-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.9lDDPGcQ/b1 --logfile b1/build.log android-platform-external-libunwind_10.0.0+r36-4.dsc'
-  SUDO_GID='113'
-  SUDO_UID='107'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://10.0.0.15:3142/'
+  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.9lDDPGcQ/pbuilderrc_pdQO --distribution bullseye --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bullseye-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.9lDDPGcQ/b2 --logfile b2/build.log android-platform-external-libunwind_10.0.0+r36-4.dsc'
+  SUDO_GID=112
+  SUDO_UID=106
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://10.0.0.15:3142/
 I: uname -a
-  Linux virt64b 6.1.0-17-arm64 #1 SMP Debian 6.1.69-1 (2023-12-30) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-17-armmp-lpae #1 SMP Debian 6.1.69-1 (2023-12-30) armv7l GNU/Linux
 I: ls -l /bin
   total 3580
   -rwxr-xr-x 1 root root 816764 Mar 27  2022 bash
@@ -133,7 +164,7 @@
   -rwxr-xr-x 1 root root  30732 Sep 22  2020 rmdir
   -rwxr-xr-x 1 root root  14144 Sep 27  2020 run-parts
   -rwxr-xr-x 1 root root  76012 Dec 22  2018 sed
-  lrwxrwxrwx 1 root root      4 Jan  7 09:26 sh -> dash
+  lrwxrwxrwx 1 root root      9 Jan  9 13:49 sh -> /bin/bash
   -rwxr-xr-x 1 root root  22532 Sep 22  2020 sleep
   -rwxr-xr-x 1 root root  55360 Sep 22  2020 stty
   -rwsr-xr-x 1 root root  46704 Jan 20  2022 su
@@ -159,7 +190,7 @@
   -rwxr-xr-x 1 root root   2206 Apr 10  2022 zless
   -rwxr-xr-x 1 root root   1842 Apr 10  2022 zmore
   -rwxr-xr-x 1 root root   4577 Apr 10  2022 znew
-I: user script /srv/workspace/pbuilder/22577/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/4074/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -233,7 +264,7 @@
 Get: 32 http://deb.debian.org/debian bullseye/main armhf dh-exec armhf 0.23.2 [25.1 kB]
 Get: 33 http://deb.debian.org/debian bullseye/main armhf p7zip armhf 16.02+dfsg-8 [317 kB]
 Get: 34 http://deb.debian.org/debian bullseye/main armhf p7zip-full armhf 16.02+dfsg-8 [956 kB]
-Fetched 19.0 MB in 7s (2538 kB/s)
+Fetched 19.0 MB in 2s (10.9 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package bsdextrautils.
 (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 ... 17486 files and directories currently installed.)
@@ -385,7 +416,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/android-platform-external-libunwind-10.0.0+r36/ && 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  > ../android-platform-external-libunwind_10.0.0+r36-4_source.changes
+I: user script /srv/workspace/pbuilder/4074/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for bullseye
+I: user script /srv/workspace/pbuilder/4074/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/android-platform-external-libunwind-10.0.0+r36/ && 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  > ../android-platform-external-libunwind_10.0.0+r36-4_source.changes
 dpkg-buildpackage: info: source package android-platform-external-libunwind
 dpkg-buildpackage: info: source version 10.0.0+r36-4
 dpkg-buildpackage: info: source distribution unstable
@@ -401,7 +436,7 @@
    debian/rules override_dh_auto_build
 make[1]: Entering directory '/build/reproducible-path/android-platform-external-libunwind-10.0.0+r36'
 dh_auto_build --buildsystem=makefile -- -f debian/libunwind.mk
-	make -j3 "INSTALL=install --strip-program=true" -f debian/libunwind.mk
+	make -j4 "INSTALL=install --strip-program=true" -f debian/libunwind.mk
 make[2]: Entering directory '/build/reproducible-path/android-platform-external-libunwind-10.0.0+r36'
 mkdir --parents debian/out
 ln -s /usr/lib/p7zip/7z.so debian/out/lib7z.so
@@ -432,9 +467,9 @@
    dh_gencontrol
    dh_md5sums
    dh_builddeb
-dpkg-deb: building package 'android-libunwind-dev' in '../android-libunwind-dev_10.0.0+r36-4_armhf.deb'.
 dpkg-deb: building package 'android-libunwind' in '../android-libunwind_10.0.0+r36-4_armhf.deb'.
 dpkg-deb: building package 'android-libunwind-dbgsym' in '../android-libunwind-dbgsym_10.0.0+r36-4_armhf.deb'.
+dpkg-deb: building package 'android-libunwind-dev' in '../android-libunwind-dev_10.0.0+r36-4_armhf.deb'.
  dpkg-genbuildinfo --build=binary
  dpkg-genchanges --build=binary >../android-platform-external-libunwind_10.0.0+r36-4_armhf.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -442,12 +477,14 @@
 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/4074/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/4074/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/22577 and its subdirectories
-I: Current time: Tue Jan  9 01:48:26 -12 2024
-I: pbuilder-time-stamp: 1704808106
+I: removing directory /srv/workspace/pbuilder/4074 and its subdirectories
+I: Current time: Wed Jan 10 03:50:46 +14 2024
+I: pbuilder-time-stamp: 1704808246