Diff of the two buildlogs:

--
--- b1/build.log	2023-04-15 08:38:04.152163139 +0000
+++ b2/build.log	2023-04-15 08:40:41.325183094 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri May 17 02:54:14 -12 2024
-I: pbuilder-time-stamp: 1715957654
+I: Current time: Sat Apr 15 22:38:07 +14 2023
+I: pbuilder-time-stamp: 1681547887
 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 [./msgpack-java_0.9.3.orig.tar.xz]
 I: copying [./msgpack-java_0.9.3-1.debian.tar.xz]
 I: Extracting source
-gpgv: Signature made Wed Jun 29 18:59:13 2022 -12
+gpgv: Signature made Thu Jun 30 20:59:13 2022 +14
 gpgv:                using RSA key 772292F6F7AC85FAE041D41EE5F43F9C2734F287
 gpgv:                issuer "merkys@debian.org"
 gpgv: Can't check signature: No public key
@@ -30,11 +30,20 @@
 dpkg-source: info: applying ignore-failing-tests.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/6822/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/20547/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink10-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
+lrwxrwxrwx 1 root root 4 Jan  6 03:20 /bin/sh -> dash
+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/20547/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/20547/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'
+  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'
@@ -44,38 +53,38 @@
   IFS=' 	
   '
   LANG='C'
-  LANGUAGE='en_US:en'
+  LANGUAGE='nl_BE:nl'
   LC_ALL='C'
   MAIL='/var/mail/root'
   OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
+  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'
-  PPID='6822'
+  PPID='20547'
   PS1='# '
   PS2='> '
   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.9FVVtr8U/pbuilderrc_YhqS --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.9FVVtr8U/b1 --logfile b1/build.log msgpack-java_0.9.3-1.dsc'
+  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.9FVVtr8U/pbuilderrc_mZRK --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.9FVVtr8U/b2 --logfile b2/build.log --extrapackages usrmerge msgpack-java_0.9.3-1.dsc'
   SUDO_GID='117'
   SUDO_UID='110'
   SUDO_USER='jenkins'
   TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
+  TZ='/usr/share/zoneinfo/Etc/GMT-14'
   USER='root'
   USERNAME='root'
   _='/usr/bin/systemd-run'
   http_proxy='http://192.168.101.16:3128'
 I: uname -a
-  Linux codethink11-arm64 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
+  Linux i-capture-the-hostname 4.15.0-208-generic #220-Ubuntu SMP Mon Mar 20 14:28:12 UTC 2023 aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 15 05:13 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/6822/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr 15 02:48 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/20547/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -382,7 +391,7 @@
 Get: 259 http://deb.debian.org/debian bookworm/main arm64 maven all 3.8.7-1 [18.9 kB]
 Get: 260 http://deb.debian.org/debian bookworm/main arm64 maven-repo-helper all 1.11 [142 kB]
 Get: 261 http://deb.debian.org/debian bookworm/main arm64 maven-debian-helper all 2.6.2 [108 kB]
-Fetched 404 MB in 32s (12.5 MB/s)
+Fetched 404 MB in 28s (14.3 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sgml-base.
 (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 ... 19616 files and directories currently installed.)
@@ -1626,8 +1635,17 @@
 Writing extended state information...
 Building tag database...
  -> Finished parsing the build-deps
+Reading package lists...
+Building dependency tree...
+Reading state information...
+usrmerge is already the newest version (35).
+0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/msgpack-java-0.9.3/ && 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  > ../msgpack-java_0.9.3-1_source.changes
+I: user script /srv/workspace/pbuilder/20547/tmp/hooks/A99_set_merged_usr starting
+Re-configuring usrmerge...
+I: user script /srv/workspace/pbuilder/20547/tmp/hooks/A99_set_merged_usr finished
+hostname: Temporary failure in name resolution
+I: Running cd /build/msgpack-java-0.9.3/ && 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  > ../msgpack-java_0.9.3-1_source.changes
 dpkg-buildpackage: info: source package msgpack-java
 dpkg-buildpackage: info: source version 0.9.3-1
 dpkg-buildpackage: info: source distribution unstable
@@ -1741,14 +1759,14 @@
 [INFO] ------------------------------------------------------------------------
 [INFO] Reactor Summary for jackson-dataformat-msgpack 0.9.3:
 [INFO] 
-[INFO] jackson-dataformat-msgpack ......................... SUCCESS [  0.005 s]
-[INFO] msgpack-core ....................................... SUCCESS [ 47.813 s]
-[INFO] msgpack-jackson .................................... SUCCESS [ 20.631 s]
+[INFO] jackson-dataformat-msgpack ......................... SUCCESS [  0.004 s]
+[INFO] msgpack-core ....................................... SUCCESS [  7.137 s]
+[INFO] msgpack-jackson .................................... SUCCESS [  2.983 s]
 [INFO] ------------------------------------------------------------------------
 [INFO] BUILD SUCCESS
 [INFO] ------------------------------------------------------------------------
-[INFO] Total time:  01:10 min
-[INFO] Finished at: 2024-05-17T02:58:59-12:00
+[INFO] Total time:  10.354 s
+[INFO] Finished at: 2023-04-15T22:39:53+14:00
 [INFO] ------------------------------------------------------------------------
    dh_auto_test
 	/usr/lib/jvm/default-java/bin/java -noverify -cp /usr/share/maven/boot/plexus-classworlds-2.x.jar -Dmaven.home=/usr/share/maven -Dmaven.multiModuleProjectDirectory=/build/msgpack-java-0.9.3 -Dclassworlds.conf=/etc/maven/m2-debian.conf -Dproperties.file.manual=/build/msgpack-java-0.9.3/debian/maven.properties org.codehaus.plexus.classworlds.launcher.Launcher -s/etc/maven/settings-debian.xml -Ddebian.dir=/build/msgpack-java-0.9.3/debian -Dmaven.repo.local=/build/msgpack-java-0.9.3/debian/maven-repo --batch-mode test
@@ -1807,65 +1825,65 @@
 [INFO]  T E S T S
 [INFO] -------------------------------------------------------
 [INFO] Running org.msgpack.jackson.dataformat.MessagePackGeneratorTest
-[WARNING] Tests run: 20, Failures: 0, Errors: 0, Skipped: 3, Time elapsed: 5.301 s - in org.msgpack.jackson.dataformat.MessagePackGeneratorTest
+[WARNING] Tests run: 20, Failures: 0, Errors: 0, Skipped: 3, Time elapsed: 1.057 s - in org.msgpack.jackson.dataformat.MessagePackGeneratorTest
 [INFO] Running org.msgpack.jackson.dataformat.MessagePackParserTest
-[INFO] Tests run: 28, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.115 s - in org.msgpack.jackson.dataformat.MessagePackParserTest
+[INFO] Tests run: 28, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.152 s - in org.msgpack.jackson.dataformat.MessagePackParserTest
 [INFO] Running org.msgpack.jackson.dataformat.MessagePackDataformatForPojoTest
-[INFO] Tests run: 7, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.386 s - in org.msgpack.jackson.dataformat.MessagePackDataformatForPojoTest
+[INFO] Tests run: 7, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.087 s - in org.msgpack.jackson.dataformat.MessagePackDataformatForPojoTest
 [INFO] Running org.msgpack.jackson.dataformat.benchmark.MessagePackDataformatPojoBenchmarkTest
 serialize(pojo) with JSON:
-  mean :  363.987
-  min  :  354.305
-  max  :  370.790
-  stdev:    7.004
+  mean :  297.970
+  min  :  291.420
+  max  :  300.482
+  stdev:    4.380
 
 serialize(pojo) with MessagePack:
-  mean :  660.576
-  min  :  597.108
-  max  :  716.434
-  stdev:   56.174
+  mean :  455.280
+  min  :  448.313
+  max  :  462.352
+  stdev:    5.732
 
 deserialize(pojo) with JSON:
-  mean : 1010.037
-  min  :  913.759
-  max  : 1259.493
-  stdev:  166.804
+  mean :  764.924
+  min  :  762.268
+  max  :  768.438
+  stdev:    2.710
 
 deserialize(pojo) with MessagePack:
-  mean :  448.820
-  min  :  381.547
-  max  :  523.176
-  stdev:   69.286
+  mean :  313.522
+  min  :  310.285
+  max  :  316.700
+  stdev:    2.701
 
-[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 38.998 s - in org.msgpack.jackson.dataformat.benchmark.MessagePackDataformatPojoBenchmarkTest
+[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 20.497 s - in org.msgpack.jackson.dataformat.benchmark.MessagePackDataformatPojoBenchmarkTest
 [INFO] Running org.msgpack.jackson.dataformat.benchmark.MessagePackDataformatHugeDataBenchmarkTest
 serialize(huge) with JSON:
-  mean :   48.344
-  min  :   46.848
-  max  :   52.273
-  stdev:    2.628
+  mean :   43.892
+  min  :   43.276
+  max  :   44.223
+  stdev:    0.422
 
 serialize(huge) with MessagePack:
-  mean :   53.162
-  min  :   50.652
-  max  :   55.996
-  stdev:    2.777
+  mean :   45.070
+  min  :   43.023
+  max  :   45.816
+  stdev:    1.367
 
 deserialize(huge) with JSON:
-  mean :   58.188
-  min  :   55.716
-  max  :   62.143
-  stdev:    3.007
+  mean :   56.380
+  min  :   55.573
+  max  :   57.228
+  stdev:    0.800
 
 deserialize(huge) with MessagePack:
-  mean :   63.994
-  min  :   51.376
-  max  :   85.710
-  stdev:   15.949
+  mean :   53.146
+  min  :   52.935
+  max  :   53.566
+  stdev:    0.287
 
-[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 8.447 s - in org.msgpack.jackson.dataformat.benchmark.MessagePackDataformatHugeDataBenchmarkTest
+[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 3.137 s - in org.msgpack.jackson.dataformat.benchmark.MessagePackDataformatHugeDataBenchmarkTest
 [INFO] Running org.msgpack.jackson.dataformat.MessagePackFactoryTest
-[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.043 s - in org.msgpack.jackson.dataformat.MessagePackFactoryTest
+[INFO] Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.012 s - in org.msgpack.jackson.dataformat.MessagePackFactoryTest
 [INFO] 
 [INFO] Results:
 [INFO] 
@@ -1874,14 +1892,14 @@
 [INFO] ------------------------------------------------------------------------
 [INFO] Reactor Summary for jackson-dataformat-msgpack 0.9.3:
 [INFO] 
-[INFO] jackson-dataformat-msgpack ......................... SUCCESS [  0.007 s]
-[INFO] msgpack-core ....................................... SUCCESS [  7.489 s]
-[INFO] msgpack-jackson .................................... SUCCESS [01:02 min]
+[INFO] jackson-dataformat-msgpack ......................... SUCCESS [  0.004 s]
+[INFO] msgpack-core ....................................... SUCCESS [  1.314 s]
+[INFO] msgpack-jackson .................................... SUCCESS [ 30.424 s]
 [INFO] ------------------------------------------------------------------------
 [INFO] BUILD SUCCESS
 [INFO] ------------------------------------------------------------------------
-[INFO] Total time:  01:11 min
-[INFO] Finished at: 2024-05-17T03:00:23-12:00
+[INFO] Total time:  32.005 s
+[INFO] Finished at: 2023-04-15T22:40:28+14:00
 [INFO] ------------------------------------------------------------------------
    create-stamp debian/debhelper-build-stamp
    dh_prep
@@ -1933,14 +1951,14 @@
 [INFO] ------------------------------------------------------------------------
 [INFO] Reactor Summary for jackson-dataformat-msgpack 0.9.3:
 [INFO] 
-[INFO] jackson-dataformat-msgpack ......................... SUCCESS [  3.172 s]
-[INFO] msgpack-core ....................................... SUCCESS [  0.505 s]
-[INFO] msgpack-jackson .................................... SUCCESS [  0.289 s]
+[INFO] jackson-dataformat-msgpack ......................... SUCCESS [  0.813 s]
+[INFO] msgpack-core ....................................... SUCCESS [  0.083 s]
+[INFO] msgpack-jackson .................................... SUCCESS [  0.051 s]
 [INFO] ------------------------------------------------------------------------
 [INFO] BUILD SUCCESS
 [INFO] ------------------------------------------------------------------------
-[INFO] Total time:  5.189 s
-[INFO] Finished at: 2024-05-17T03:00:39-12:00
+[INFO] Total time:  1.263 s
+[INFO] Finished at: 2023-04-15T22:40:32+14:00
 [INFO] ------------------------------------------------------------------------
 	mh_resolve_dependencies --non-interactive --offline --build -plibmsgpack-java --base-directory=/build/msgpack-java-0.9.3 --non-explore
 Analysing pom.xml...
@@ -1965,12 +1983,14 @@
 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/20547/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/20547/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/6822 and its subdirectories
-I: Current time: Fri May 17 03:01:02 -12 2024
-I: pbuilder-time-stamp: 1715958062
+I: removing directory /srv/workspace/pbuilder/20547 and its subdirectories
+I: Current time: Sat Apr 15 22:40:40 +14 2023
+I: pbuilder-time-stamp: 1681548040