Diff of the two buildlogs:

--
--- b1/build.log	2023-04-20 12:59:47.123451018 +0000
+++ b2/build.log	2023-04-20 13:00:49.928664745 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Apr 20 00:58:39 -12 2023
-I: pbuilder-time-stamp: 1681995519
+I: Current time: Thu May 23 09:22:49 +14 2024
+I: pbuilder-time-stamp: 1716405769
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bookworm-reproducible-base.tgz]
 I: copying local configuration
@@ -16,7 +16,7 @@
 I: copying [./flowgrind_0.8.2.orig.tar.gz]
 I: copying [./flowgrind_0.8.2-2.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Sun Jan 17 01:14:24 2021 -12
+gpgv: Signature made Mon Jan 18 03:14:24 2021 +14
 gpgv:                using RSA key 5C48FE6157F49179597087C64C5A6BAB12D2A7AE
 gpgv: Can't check signature: No public key
 dpkg-source: warning: cannot verify inline signature for ./flowgrind_0.8.2-2.dsc: no acceptable signature found
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking flowgrind_0.8.2-2.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/23463/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1977/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink9-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 May 23 09:22 /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/1977/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1977/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build'
-  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]="15" [3]="1" [4]="release" [5]="aarch64-unknown-linux-gnu")
+  BASH_VERSION='5.2.15(1)-release'
+  BUILDDIR=/build
+  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=8'
-  DISTRIBUTION='bookworm'
-  HOME='/var/lib/jenkins'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=bookworm
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/var/lib/jenkins
+  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='23463'
-  PS1='# '
-  PS2='> '
+  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=1977
   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.SLnpKcK8/pbuilderrc_OFFO --distribution bookworm --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.SLnpKcK8/b1 --logfile b1/build.log flowgrind_0.8.2-2.dsc'
-  SUDO_GID='117'
-  SUDO_UID='110'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  USERNAME='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.16:3128'
+  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.SLnpKcK8/pbuilderrc_sSFm --distribution bookworm --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.SLnpKcK8/b2 --logfile b2/build.log --extrapackages usrmerge flowgrind_0.8.2-2.dsc'
+  SUDO_GID=117
+  SUDO_UID=110
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  USERNAME=root
+  _='I: set'
+  http_proxy=http://192.168.101.16:3128
 I: uname -a
-  Linux codethink16-arm64 4.15.0-209-generic #220-Ubuntu SMP Tue Mar 21 19:52:44 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-209-generic #220-Ubuntu SMP Tue Mar 21 19:52:44 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Apr 19 22:25 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/23463/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 21 06:48 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/1977/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -177,7 +209,7 @@
 Get: 56 http://deb.debian.org/debian bookworm/main arm64 libxmlrpc-core-c3 arm64 1.33.14-11 [140 kB]
 Get: 57 http://deb.debian.org/debian bookworm/main arm64 libxmlrpc-core-c3-dev arm64 1.33.14-11 [213 kB]
 Get: 58 http://deb.debian.org/debian bookworm/main arm64 uuid-dev arm64 2.38.1-5+b1 [40.5 kB]
-Fetched 23.8 MB in 1s (17.5 MB/s)
+Fetched 23.8 MB in 1s (41.9 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sgml-base.
 (Reading database ... 
(Reading database ... 5%
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(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
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(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 ... 19616 files and directories currently installed.)
@@ -427,10 +459,15 @@
 Reading package lists...
 Building dependency tree...
 Reading state information...
+usrmerge is already the newest version (35).
 fakeroot is already the newest version (1.31-1.2).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/flowgrind-0.8.2/ && 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  > ../flowgrind_0.8.2-2_source.changes
+I: user script /srv/workspace/pbuilder/1977/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/1977/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/flowgrind-0.8.2/ && 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  > ../flowgrind_0.8.2-2_source.changes
 dpkg-buildpackage: info: source package flowgrind
 dpkg-buildpackage: info: source version 0.8.2-2
 dpkg-buildpackage: info: source distribution unstable
@@ -616,7 +653,6 @@
 cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline  -I/usr/include  -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrind-fg_argparser.o `test -f 'src/fg_argparser.c' || echo './'`src/fg_argparser.c
 cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline  -I/usr/include  -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrind-fg_rpc_client.o `test -f 'src/fg_rpc_client.c' || echo './'`src/fg_rpc_client.c
 cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline  -I/usr/include  -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrind-fg_log.o `test -f 'src/fg_log.c' || echo './'`src/fg_log.c
-cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline  -I/usr/include  -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrind-fg_list.o `test -f 'src/fg_list.c' || echo './'`src/fg_list.c
 src/fg_rpc_client.c: In function 'parse_rpc_address':
 src/fg_rpc_client.c:51:28: warning: comparison between pointer and zero character constant [-Wpointer-compare]
    51 |                 if (sepptr != '\0' && *sepptr == ':')
@@ -624,6 +660,7 @@
 src/fg_rpc_client.c:51:21: note: did you mean to dereference the pointer?
    51 |                 if (sepptr != '\0' && *sepptr == ':')
       |                     ^
+cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline  -I/usr/include  -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrind-fg_list.o `test -f 'src/fg_list.c' || echo './'`src/fg_list.c
 cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline  -I/usr/include  -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrind_stop-fg_error.o `test -f 'src/fg_error.c' || echo './'`src/fg_error.c
 cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline  -I/usr/include  -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrind_stop-fg_progname.o `test -f 'src/fg_progname.c' || echo './'`src/fg_progname.c
 cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline  -I/usr/include  -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrind_stop-flowgrind_stop.o `test -f 'src/flowgrind_stop.c' || echo './'`src/flowgrind_stop.c
@@ -640,6 +677,7 @@
       |                     ^
 cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline -I/usr/include   -I/usr/include -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrindd-destination.o `test -f 'src/destination.c' || echo './'`src/destination.c
 cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline -I/usr/include   -I/usr/include -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrindd-fg_error.o `test -f 'src/fg_error.c' || echo './'`src/fg_error.c
+cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline -I/usr/include   -I/usr/include -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrindd-fg_math.o `test -f 'src/fg_math.c' || echo './'`src/fg_math.c
 src/flowgrind.c: In function 'report_flow':
 src/flowgrind.c:1526:35: warning: dangling pointer 'i' to an unnamed temporary may be used [-Wdangling-pointer=]
  1526 |         print_interval_report(id, *i, report);
@@ -651,9 +689,9 @@
 src/flowgrind.c:1498:17: note: in expansion of macro 'foreach'
  1498 |                 foreach(i, SOURCE, DESTINATION)
       |                 ^~~~~~~
-cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline -I/usr/include   -I/usr/include -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrindd-fg_math.o `test -f 'src/fg_math.c' || echo './'`src/fg_math.c
 cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline -I/usr/include   -I/usr/include -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrindd-fg_progname.o `test -f 'src/fg_progname.c' || echo './'`src/fg_progname.c
 cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline -I/usr/include   -I/usr/include -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrindd-fg_socket.o `test -f 'src/fg_socket.c' || echo './'`src/fg_socket.c
+cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline -I/usr/include   -I/usr/include -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrindd-fg_string.o `test -f 'src/fg_string.c' || echo './'`src/fg_string.c
 src/daemon.c: In function 'report_flow':
 src/daemon.c:598:64: warning: the comparison will always evaluate as 'true' for the address of 'finished' will never be NULL [-Waddress]
   598 |                 if (!flow_sending(&report->end, flow, READ) && !flow->finished)
@@ -669,7 +707,6 @@
 src/daemon.h:112:14: note: 'finished' declared here
   112 |         char finished[2];
       |              ^~~~~~~~
-cc -DHAVE_CONFIG_H -I. -I./src   -Wdate-time -D_FORTIFY_SOURCE=2 -Wall -Wextra -Werror=implicit -std=gnu99 -fgnu89-inline -I/usr/include   -I/usr/include -I/usr/include -g -O2 -ffile-prefix-map=/build/flowgrind-0.8.2=. -fstack-protector-strong -Wformat -Werror=format-security -c -o src/flowgrindd-fg_string.o `test -f 'src/fg_string.c' || echo './'`src/fg_string.c
 src/destination.c: In function 'create_listen_socket':
 src/destination.c:127:13: warning: the comparison will always evaluate as 'true' for the address of 'cc_alg' will never be NULL [-Waddress]
   127 |         if (flow->settings.cc_alg)
@@ -767,12 +804,14 @@
 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/1977/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1977/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/23463 and its subdirectories
-I: Current time: Thu Apr 20 00:59:46 -12 2023
-I: pbuilder-time-stamp: 1681995586
+I: removing directory /srv/workspace/pbuilder/1977 and its subdirectories
+I: Current time: Thu May 23 09:23:49 +14 2024
+I: pbuilder-time-stamp: 1716405829