Diff of the two buildlogs:

--
--- b1/build.log	2025-01-30 14:10:23.199180011 +0000
+++ b2/build.log	2025-01-30 14:12:31.465385474 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Jan 30 02:08:11 -12 2025
-I: pbuilder-time-stamp: 1738246091
+I: Current time: Fri Jan 31 04:10:32 +14 2025
+I: pbuilder-time-stamp: 1738246232
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking fuse-overlayfs_1.14-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/23244/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/9538/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64z.
+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 30 14:10 /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/9538/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/9538/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 parallel=3 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='armhf'
+  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]="arm-unknown-linux-gnueabihf")
+  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=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=4 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='44e3068192ba489da354481a26d22ea8'
-  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='23244'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=1d8510c7999b4f4e9f7b48180d863fca
+  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=9538
   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.u8CaZrmT/pbuilderrc_zmym --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.u8CaZrmT/b1 --logfile b1/build.log fuse-overlayfs_1.14-1.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.u8CaZrmT/pbuilderrc_YUae --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.u8CaZrmT/b2 --logfile b2/build.log fuse-overlayfs_1.14-1.dsc'
+  SUDO_GID=110
+  SUDO_UID=103
+  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 ff4a 6.1.0-30-armmp-lpae #1 SMP Debian 6.1.124-1 (2025-01-12) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-30-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/23244/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/9538/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -155,7 +187,7 @@
 Get: 39 http://deb.debian.org/debian unstable/main armhf libpkgconf3 armhf 1.8.1-4 [31.8 kB]
 Get: 40 http://deb.debian.org/debian unstable/main armhf pkgconf-bin armhf 1.8.1-4 [29.2 kB]
 Get: 41 http://deb.debian.org/debian unstable/main armhf pkgconf armhf 1.8.1-4 [26.1 kB]
-Fetched 22.3 MB in 2s (14.5 MB/s)
+Fetched 22.3 MB in 6s (3887 kB/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 ... 19567 files and directories currently installed.)
@@ -334,7 +366,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/fuse-overlayfs-1.14/ && 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  > ../fuse-overlayfs_1.14-1_source.changes
+I: user script /srv/workspace/pbuilder/9538/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/9538/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/fuse-overlayfs-1.14/ && 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  > ../fuse-overlayfs_1.14-1_source.changes
 dpkg-buildpackage: info: source package fuse-overlayfs
 dpkg-buildpackage: info: source version 1.14-1
 dpkg-buildpackage: info: source distribution unstable
@@ -459,7 +495,7 @@
 go-md2man -in /build/reproducible-path/fuse-overlayfs-1.14/fuse-overlayfs.1.md -out fuse-overlayfs.1
 make[2]: Leaving directory '/build/reproducible-path/fuse-overlayfs-1.14'
 dh_auto_build
-	make -j3
+	make -j4
 make[2]: Entering directory '/build/reproducible-path/fuse-overlayfs-1.14'
 make  all-recursive
 make[3]: Entering directory '/build/reproducible-path/fuse-overlayfs-1.14'
@@ -503,6 +539,7 @@
 gcc -DHAVE_CONFIG_H -I.  -DPKGLIBEXECDIR='"/usr/libexec/fuse-overlayfs"' -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2 -I . -I /build/reproducible-path/fuse-overlayfs-1.14/lib -I/usr/include/fuse3  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/fuse-overlayfs-1.14=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -c -o fuse_overlayfs-main.o `test -f 'main.c' || echo './'`main.c
 gcc -DHAVE_CONFIG_H -I.  -DPKGLIBEXECDIR='"/usr/libexec/fuse-overlayfs"' -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2 -I . -I /build/reproducible-path/fuse-overlayfs-1.14/lib -I/usr/include/fuse3  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/fuse-overlayfs-1.14=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -c -o fuse_overlayfs-direct.o `test -f 'direct.c' || echo './'`direct.c
 gcc -DHAVE_CONFIG_H -I.  -DPKGLIBEXECDIR='"/usr/libexec/fuse-overlayfs"' -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2 -I . -I /build/reproducible-path/fuse-overlayfs-1.14/lib -I/usr/include/fuse3  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/fuse-overlayfs-1.14=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -c -o fuse_overlayfs-utils.o `test -f 'utils.c' || echo './'`utils.c
+gcc -DHAVE_CONFIG_H -I.  -DPKGLIBEXECDIR='"/usr/libexec/fuse-overlayfs"' -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2 -I . -I /build/reproducible-path/fuse-overlayfs-1.14/lib -I/usr/include/fuse3  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/fuse-overlayfs-1.14=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -c -o fuse_overlayfs-plugin-manager.o `test -f 'plugin-manager.c' || echo './'`plugin-manager.c
 main.c: In function 'node_to_inode':
 main.c:281:10: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
   281 |   return (ino_t) n->ino;
@@ -625,7 +662,6 @@
       |                                              ~~~~~~~
       |                                              |
       |                                              off_t {aka long long int}
-gcc -DHAVE_CONFIG_H -I.  -DPKGLIBEXECDIR='"/usr/libexec/fuse-overlayfs"' -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_TIME_BITS=64 -Wdate-time -D_FORTIFY_SOURCE=2 -I . -I /build/reproducible-path/fuse-overlayfs-1.14/lib -I/usr/include/fuse3  -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/fuse-overlayfs-1.14=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -c -o fuse_overlayfs-plugin-manager.o `test -f 'plugin-manager.c' || echo './'`plugin-manager.c
 main.c:5463:116: note: format string is defined here
  5463 |     fprintf (stderr, "ovl_copy_file_range(ino_in=%" PRIu64 ", off_in=%lo, fi_in=%p, ino_out=%" PRIu64 ", off_out=%lo, fi_out=%p, size=%zu, flags=%d)\n",
       |                                                                                                                  ~~^
@@ -642,7 +678,7 @@
 make[2]: Leaving directory '/build/reproducible-path/fuse-overlayfs-1.14'
 make[1]: Leaving directory '/build/reproducible-path/fuse-overlayfs-1.14'
    dh_auto_test
-	make -j3 check "TESTSUITEFLAGS=-j3 --verbose" VERBOSE=1
+	make -j4 check "TESTSUITEFLAGS=-j4 --verbose" VERBOSE=1
 make[1]: Entering directory '/build/reproducible-path/fuse-overlayfs-1.14'
 Making check in lib
 make[2]: Entering directory '/build/reproducible-path/fuse-overlayfs-1.14/lib'
@@ -659,7 +695,7 @@
    create-stamp debian/debhelper-build-stamp
    dh_prep
    dh_auto_install --destdir=debian/fuse-overlayfs/
-	make -j3 install DESTDIR=/build/reproducible-path/fuse-overlayfs-1.14/debian/fuse-overlayfs AM_UPDATE_INFO_DIR=no
+	make -j4 install DESTDIR=/build/reproducible-path/fuse-overlayfs-1.14/debian/fuse-overlayfs AM_UPDATE_INFO_DIR=no
 make[1]: Entering directory '/build/reproducible-path/fuse-overlayfs-1.14'
 Making install in lib
 make[2]: Entering directory '/build/reproducible-path/fuse-overlayfs-1.14/lib'
@@ -712,12 +748,14 @@
 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/9538/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/9538/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/23244 and its subdirectories
-I: Current time: Thu Jan 30 02:10:19 -12 2025
-I: pbuilder-time-stamp: 1738246219
+I: removing directory /srv/workspace/pbuilder/9538 and its subdirectories
+I: Current time: Fri Jan 31 04:12:27 +14 2025
+I: pbuilder-time-stamp: 1738246347