Diff of the two buildlogs:

--
--- b1/build.log	2025-02-19 09:54:33.046564690 +0000
+++ b2/build.log	2025-02-19 09:58:39.743475702 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Feb 18 21:53:07 -12 2025
-I: pbuilder-time-stamp: 1739958787
+I: Current time: Wed Feb 19 23:54:46 +14 2025
+I: pbuilder-time-stamp: 1739958886
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -35,52 +35,84 @@
 dpkg-source: info: applying clean-files.patch
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/6155/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/27303/tmp/hooks/D01_modify_environment starting
+debug: Running on cbxi4a.
+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 19 09:55 /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/27303/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/27303/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='498235f31b6548749b55712c47a37d1a'
-  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='6155'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=1f2a41a21fde4e30a8844071b142876c
+  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=27303
   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.xNd9snPc/pbuilderrc_TajG --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.xNd9snPc/b1 --logfile b1/build.log mbuffer_20241007+ds1-1.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.xNd9snPc/pbuilderrc_t4JO --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.xNd9snPc/b2 --logfile b2/build.log mbuffer_20241007+ds1-1.dsc'
+  SUDO_GID=113
+  SUDO_UID=107
+  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 6.1.0-31-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-23-armmp #1 SMP Debian 6.1.99-1 (2024-07-15) armv7l GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/6155/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/27303/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -158,7 +190,7 @@
 Get: 32 http://deb.debian.org/debian unstable/main armhf libgpg-error0 armhf 1.51-3 [71.9 kB]
 Get: 33 http://deb.debian.org/debian unstable/main armhf libgcrypt20 armhf 1.11.0-7 [727 kB]
 Get: 34 http://deb.debian.org/debian unstable/main armhf openssl armhf 3.4.1-1 [1393 kB]
-Fetched 22.0 MB in 0s (62.0 MB/s)
+Fetched 22.0 MB in 1s (18.0 MB/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 ... 19523 files and directories currently installed.)
@@ -314,7 +346,11 @@
 fakeroot is already the newest version (1.37-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/mbuffer-20241007+ds1/ && 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  > ../mbuffer_20241007+ds1-1_source.changes
+I: user script /srv/workspace/pbuilder/27303/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/27303/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/mbuffer-20241007+ds1/ && 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  > ../mbuffer_20241007+ds1-1_source.changes
 dpkg-buildpackage: info: source package mbuffer
 dpkg-buildpackage: info: source version 20241007+ds1-1
 dpkg-buildpackage: info: source distribution unstable
@@ -430,7 +466,7 @@
 config.status: creating Makefile
 config.status: creating config.h
    dh_auto_build
-	make -j3
+	make -j4
 make[1]: Entering directory '/build/reproducible-path/mbuffer-20241007+ds1'
 [ -d build ] || mkdir build
 touch build/created.stamp
@@ -459,7 +495,7 @@
 gcc -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/mbuffer-20241007+ds1=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -Wno-unused-result -DHAVE_CONFIG_H -DPREFIX=\"/usr\" -I. -I. -Wl,-z,relro -Wl,-z,now -Wl,-z,defs -specs=/usr/share/debhelper/dh_package_notes/debian-package-notes.specs build/log.o build/network.o build/mbuffer.o build/hashing.o build/input.o build/common.o build/settings.o build/globals.o -lm -lpthread  -o mbuffer
 make[1]: Leaving directory '/build/reproducible-path/mbuffer-20241007+ds1'
    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/mbuffer-20241007+ds1'
 bash mkversion.sh
 /usr/bin/tar cf test.tar --ignore-failed-read /bin /usr/bin
@@ -468,7 +504,8 @@
 version.h is up-to-date
 openssl md5 > mbuffer.md5 < mbuffer 
 LD_PRELOAD=./idev.so BSIZE=317 IDEV=mbuffer ./mbuffer -s256 -i mbuffer -f -o mbuffer2
-idev.so: d_open = 0xf7bacfd9
+./mbuffer -P90 --md5 -i INSTALL -o /dev/null
+idev.so: d_open = 0xb6e6cfd9
 idev.so: open(/proc/meminfo,0x0,...) = 3 (IDEV='mbuffer')
 idev.so: open(/etc/mbuffer.rc,0x0,...) = -1 (IDEV='mbuffer')
 idev.so: open(/usr/etc/mbuffer.rc,0x0,...) = -1 (IDEV='mbuffer')
@@ -479,22 +516,21 @@
 idev.so: open(/dev/tty,0x2,...) = -1 (IDEV='mbuffer')
 mbuffer: warning: No controlling terminal and no autoloader command specified.
 mbuffer: warning: Block size is not a multiple of native input size (317B).
-./mbuffer -P90 --md5 -i INSTALL -o /dev/null
-summary:  300 kiByte in  0.0sec - average of 12.3 MiB/s
 mbuffer: warning: No controlling terminal and no autoloader command specified.
+summary:  300 kiByte in  0.1sec - average of 5157 kiB/s
 MD5 hash: 8bb45d9574a827d338e06f010f00c8c1
 summary:  0.0 kiByte in  0.0sec - average of  0.0 kiB/s
 openssl md5 < test.tar > test.md5
 ./mbuffer -v 5 -i /etc/hostname
-mbuffer: available memory: 18014398507543140kB / -484711 pages
-mbuffer: Cannot allocate that many blocks (4096 * 4294943061 > 2147483647)
+mbuffer: available memory: 18014398508959824kB / -130540 pages
+mbuffer: Cannot allocate that many blocks (4096 * 4294960769 > 2147483647)
 mbuffer: default Numblocks = 1023, default Blocksize = 2097152, buffer size 2095104kiB
 mbuffer: no config file /etc/mbuffer.rc
 mbuffer: no config file /usr/etc/mbuffer.rc
 mbuffer: no config file /build/reproducible-path/mbuffer-20241007+ds1/debian/.debhelper/generated/_source/home/.mbuffer.rc
 mbuffer: default buffer set to 1023 blocks of 2MiB
 mbuffer: Infile = /etc/hostname
-mbuffer: available: 18014398507543140kiB, buffer: 2095104kiB
+mbuffer: available: 18014398508959824kiB, buffer: 2095104kiB
 mbuffer: 1023 blocks with 2MiB
 mbuffer: allocating 2046MiB as buffer
 mbuffer: creating semaphores...
@@ -512,11 +548,11 @@
 mbuffer: 0 senders, 0 hashers
 mbuffer: outputThread: starting output on <stdout>...
 mbuffer: timeout init: 0.500000 => 0 : 500000
-mbuffer: inputThread: starting with threadid 0x7742c420...
-mbuffer: inputThread: last block has 51791722132275200 bytes
+mbuffer: inputThread: starting with threadid 0x3674c420...
+mbuffer: inputThread: last block has 23081274507788288 bytes
 mbuffer: inputThread: exiting...
-mbuffer: outputThread: last block has 8 bytes
-virt64b
+mbuffer: outputThread: last block has 7 bytes
+cbxi4a
 mbuffer: outputThread: syncing <stdout>...
 mbuffer: syncing unsupported on <stdout>: omitted.
 mbuffer: outputThread: finished - exiting...
@@ -536,22 +572,6 @@
 	cp test.tar test2.tar; \
 	cp test.md5 test2.md5; \
 fi
-SKIPPING the IPv4-only test!
-mbuffer: warning: No controlling terminal and no autoloader command specified.
-sync
-
in @ 17.0 MiB/s, out @ 17.0 MiB/s, 12.0 MiB total, buffer   0% full,  21% done
in @ 17.0 MiB/s, out @ 34.1 MiB/s, 2 x 12.0 MiB total, buffer   0% full,  21% donediff test2.md5 test.md5
-rm test2.md5
-openssl md5 < test2.tar > test2.md5 
-
-summary: 56.7 MiByte in  1.2sec - average of 49.1 MiB/s
-
in @ 79.7 MiB/s, out @  127 MiB/s, 2 x 44.0 MiB total, buffer   0% full,  78% done
-MD5 hash: 0cde7af39bd2ec62a8cca00398e8b7ec
-summary: 2x 56.7 MiByte in  1.3sec - average of 87.9 MiB/s
-openssl md5 < test1.tar > test1.md5
-rm -f test2.tar
-sync
-diff test2.md5 test.md5
-touch test2
 if ./have-af inet6; then \
 	./mbuffer --pid -q -6 -I :7002 | openssl md5 > test3.md5 & \
 		sleep 1; \
@@ -564,23 +584,49 @@
 	cp test.md5 test3.md5; \
 fi
 SKIPPING the IPv6-only test!
+SKIPPING the IPv4-only test!
+mbuffer: warning: No controlling terminal and no autoloader command specified.
+
in @ 2255 kiB/s, out @ 4510 kiB/s, 2 x 2048 kiB total, buffer   0% full,   4% done
in @ 2256 kiB/s, out @ 2256 kiB/s, 2048 kiB total, buffer   0% full,   4% donesync
 sync
-sync
-diff test0.md5 test.md5
-diff test3.md5 test.md5
-touch test0
+
in @  0.0 kiB/s, out @  0.0 kiB/s, 2 x 2048 kiB total, buffer   0% full,   4% done
in @  0.0 kiB/s, out @  0.0 kiB/s, 2048 kiB total, buffer   0% full,   4% done
in @ 35.4 MiB/s, out @ 63.0 MiB/s, 2 x 18.0 MiB total, buffer   0% full,  32% done
in @ 35.8 MiB/s, out @ 31.8 MiB/s, 18.0 MiB total, buffer   0% full,  32% donediff test3.md5 test.md5
+diff test2.md5 test.md5
 rm test3.md5
 openssl md5 < test3.tar > test3.md5 
+
in @ 31.6 MiB/s, out @ 71.0 MiB/s, 2 x 36.0 MiB total, buffer   0% full,  64% donerm test2.md5
+
in @ 31.7 MiB/s, out @ 27.8 MiB/s, 32.0 MiB total, buffer   0% full,  56% doneopenssl md5 < test2.tar > test2.md5 
+
in @ 31.8 MiB/s, out @ 63.6 MiB/s, 2 x 52.0 MiB total, buffer   0% full,  92% done
in @ 35.9 MiB/s, out @ 31.9 MiB/s, 48.0 MiB total, buffer   0% full,  85% done
+MD5 hash: 027954d1470e4da14c3fedb9b9367206
+summary: 2x 56.7 MiByte in  3.1sec - average of 36.6 MiB/s
+
+openssl md5 < test1.tar > test1.md5
+summary: 56.7 MiByte in  3.1sec - average of 18.2 MiB/s
+rm -f test2.tar
+sync
+diff test2.md5 test.md5
+touch test2
 rm -f output-test4.tar.*
 cat mbuffer | LD_PRELOAD=./tapetest.so ./mbuffer -s10k -f -o output-test4 -H -A "echo '[test4] Replacing tape'"
+rm -f test3.tar
+
 [test4] Replacing tape
+
 [test4] Replacing tape
+sync
+
 [test4] Replacing tape
+diff test3.md5 test.md5
+
 [test4] Replacing tape
+touch test3
+rm -f output-test5.tar.*
+
 [test4] Replacing tape
+cat mbuffer | LD_PRELOAD=./tapetest.so ./mbuffer -s10k -f -o output-test5 -H -A "echo '[test5] Replacing tape'" --tapeaware
+
 [test4] Replacing tape
+
 MD5 hash: b1f724e198247767873545e33b0d42e7
-summary:  300 kiByte in  0.0sec - average of 6495 kiB/s
+summary:  300 kiByte in  0.3sec - average of 1108 kiB/s
 
 
 
@@ -632,16 +678,18 @@
 [INTERCEPT] write(block 0): OK
 [INTERCEPT] write(block 1): OK
 cat output-test4* | openssl md5 > test4.md5
+
+[test5] Replacing tape
 rm -f output-test4 output-test4.*
 sync
-diff test4.md5 mbuffer.md5 > test4
-rm -f output-test5.tar.*
-cat mbuffer | LD_PRELOAD=./tapetest.so ./mbuffer -s10k -f -o output-test5 -H -A "echo '[test5] Replacing tape'" --tapeaware
-[test5] Replacing tape
+
 [test5] Replacing tape
+diff test4.md5 mbuffer.md5 > test4
+
 [test5] Replacing tape
+
 MD5 hash: b1f724e198247767873545e33b0d42e7
-summary:  300 kiByte in  0.1sec - average of 5703 kiB/s
+summary:  300 kiByte in  0.2sec - average of 1266 kiB/s
 
 
 
@@ -705,22 +753,21 @@
 [INTERCEPT] write(block 0): OK
 [INTERCEPT] write(block 1): OK
 cat output-test5* | openssl md5 > test5.md5
-rm -f test3.tar
-rm -f output-test5 output-test5.*
 sync
-rm -f test1.tar
+rm -f output-test5 output-test5.*
 sync
+diff test0.md5 test.md5
+touch test0
 diff test5.md5 mbuffer.md5 > test5
+rm -f test1.tar
 sync
-diff test3.md5 test.md5
-touch test3
 diff test1.md5 test.md5
 touch test1
 make[1]: Leaving directory '/build/reproducible-path/mbuffer-20241007+ds1'
    create-stamp debian/debhelper-build-stamp
    dh_prep
    dh_auto_install --destdir=debian/mbuffer/
-	make -j3 install DESTDIR=/build/reproducible-path/mbuffer-20241007\+ds1/debian/mbuffer AM_UPDATE_INFO_DIR=no
+	make -j4 install DESTDIR=/build/reproducible-path/mbuffer-20241007\+ds1/debian/mbuffer AM_UPDATE_INFO_DIR=no
 make[1]: Entering directory '/build/reproducible-path/mbuffer-20241007+ds1'
 bash mkversion.sh
 /usr/bin/install -c -d -m 755 /build/reproducible-path/mbuffer-20241007+ds1/debian/mbuffer/etc
@@ -762,8 +809,8 @@
    dh_gencontrol
    dh_md5sums
    dh_builddeb
-dpkg-deb: building package 'mbuffer' in '../mbuffer_20241007+ds1-1_armhf.deb'.
 dpkg-deb: building package 'mbuffer-dbgsym' in '../mbuffer-dbgsym_20241007+ds1-1_armhf.deb'.
+dpkg-deb: building package 'mbuffer' in '../mbuffer_20241007+ds1-1_armhf.deb'.
  dpkg-genbuildinfo --build=binary -O../mbuffer_20241007+ds1-1_armhf.buildinfo
  dpkg-genchanges --build=binary -O../mbuffer_20241007+ds1-1_armhf.changes
 dpkg-genchanges: info: binary-only upload (no source code included)
@@ -771,12 +818,14 @@
 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/27303/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/27303/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/6155 and its subdirectories
-I: Current time: Tue Feb 18 21:54:29 -12 2025
-I: pbuilder-time-stamp: 1739958869
+I: removing directory /srv/workspace/pbuilder/27303 and its subdirectories
+I: Current time: Wed Feb 19 23:58:35 +14 2025
+I: pbuilder-time-stamp: 1739959115