Diff of the two buildlogs:

--
--- b1/build.log	2025-03-22 05:58:39.784337618 +0000
+++ b2/build.log	2025-03-22 06:01:42.540101960 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri Mar 21 17:47:27 -12 2025
-I: pbuilder-time-stamp: 1742622447
+I: Current time: Sat Apr 25 02:21:42 +14 2026
+I: pbuilder-time-stamp: 1777033302
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: applying no-wildfly.patch
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/221931/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/569167/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos15-amd64.
+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 Apr 24 12:22 /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/569167/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/569167/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='amd64'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=20 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='amd64'
+  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]="x86_64-pc-linux-gnu")
+  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=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=42 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='c19945637c3745d38d4aeb2f4348d080'
-  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='221931'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=faf7965fe9e24f6ba5c1c48f6d956ecc
+  LANG=C
+  LANGUAGE=et_EE:et
+  LC_ALL=C
+  MACHTYPE=x86_64-pc-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=569167
   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.e9hQzQGR/pbuilderrc_KD8D --distribution trixie --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.e9hQzQGR/b1 --logfile b1/build.log undertow_2.3.18-2.dsc'
-  SUDO_GID='111'
-  SUDO_UID='106'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://46.16.76.132:3128'
+  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.e9hQzQGR/pbuilderrc_QefK --distribution trixie --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.e9hQzQGR/b2 --logfile b2/build.log undertow_2.3.18-2.dsc'
+  SUDO_GID=111
+  SUDO_UID=106
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://213.165.73.152:3128
 I: uname -a
-  Linux ionos11-amd64 6.1.0-32-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.129-1 (2025-03-06) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.12.12+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.12-1~bpo12+1 (2025-02-23) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Mar  4 11:20 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/221931/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar  4  2025 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/569167/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -501,7 +533,7 @@
 Get: 351 http://deb.debian.org/debian trixie/main amd64 maven all 3.9.9-1 [19.7 kB]
 Get: 352 http://deb.debian.org/debian trixie/main amd64 maven-repo-helper all 1.11 [142 kB]
 Get: 353 http://deb.debian.org/debian trixie/main amd64 maven-debian-helper all 2.6.7 [108 kB]
-Fetched 319 MB in 18s (17.4 MB/s)
+Fetched 319 MB in 12s (25.8 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libsystemd-shared:amd64.
 (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 ... 19785 files and directories currently installed.)
@@ -2150,7 +2182,11 @@
 fakeroot is already the newest version (1.37.1-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/undertow-2.3.18/ && 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  > ../undertow_2.3.18-2_source.changes
+I: user script /srv/workspace/pbuilder/569167/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/569167/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/undertow-2.3.18/ && 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  > ../undertow_2.3.18-2_source.changes
 dpkg-buildpackage: info: source package undertow
 dpkg-buildpackage: info: source version 2.3.18-2
 dpkg-buildpackage: info: source distribution unstable
@@ -2349,28 +2385,26 @@
 [INFO] Recompiling the module because of changed dependency.
 [INFO] Compiling 43 source files with javac [forked debug target 1.9] to target/classes
 [WARNING] Unable to autodetect 'javac' path, using 'javac' from the environment.
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[40,30] error: cannot find symbol
-  symbol:   class ClassIntrospecter
-  location: package io.undertow.servlet.api
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[42,31] error: package io.undertow.servlet.util does not exist
 [ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/ServerWebSocketContainer.java:[23,30] error: cannot find symbol
   symbol:   class ClassIntrospecter
   location: package io.undertow.servlet.api
 [ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/ServerWebSocketContainer.java:[28,31] error: package io.undertow.servlet.util does not exist
 [ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/ServerWebSocketContainer.java:[29,31] error: package io.undertow.servlet.util does not exist
 [ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/ServerWebSocketContainer.java:[30,37] error: package io.undertow.servlet.websockets does not exist
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[147,64] error: cannot find symbol
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/JsrWebSocketFilter.java:[52,37] error: package io.undertow.servlet.websockets does not exist
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/EncodingFactory.java:[41,30] error: cannot find symbol
   symbol:   class ClassIntrospecter
-  location: class UndertowContainerProvider
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[134,44] error: cannot find symbol
+  location: package io.undertow.servlet.api
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/EncodingFactory.java:[146,54] error: cannot find symbol
   symbol:   class ClassIntrospecter
-  location: class UndertowContainerProvider
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[149,25] error: cannot find symbol
+  location: class EncodingFactory
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/EncodingFactory.java:[150,54] error: cannot find symbol
   symbol:   class ClassIntrospecter
-  location: class SwitchableClassIntrospector
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[156,36] error: cannot find symbol
+  location: class EncodingFactory
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/EncodingFactory.java:[287,80] error: cannot find symbol
   symbol:   class ClassIntrospecter
-  location: class SwitchableClassIntrospector
+  location: class EncodingFactory
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/EndpointSessionHandler.java:[23,31] error: package io.undertow.servlet.util does not exist
 [ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/ServerWebSocketContainer.java:[105,18] error: cannot find symbol
   symbol:   class ClassIntrospecter
   location: class ServerWebSocketContainer
@@ -2386,20 +2420,22 @@
 [ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/ServerWebSocketContainer.java:[153,42] error: cannot find symbol
   symbol:   class ClassIntrospecter
   location: class ServerWebSocketContainer
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/EncodingFactory.java:[41,30] error: cannot find symbol
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[40,30] error: cannot find symbol
   symbol:   class ClassIntrospecter
   location: package io.undertow.servlet.api
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/EncodingFactory.java:[146,54] error: cannot find symbol
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[42,31] error: package io.undertow.servlet.util does not exist
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[147,64] error: cannot find symbol
   symbol:   class ClassIntrospecter
-  location: class EncodingFactory
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/EncodingFactory.java:[150,54] error: cannot find symbol
+  location: class UndertowContainerProvider
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[134,44] error: cannot find symbol
   symbol:   class ClassIntrospecter
-  location: class EncodingFactory
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/EncodingFactory.java:[287,80] error: cannot find symbol
+  location: class UndertowContainerProvider
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[149,25] error: cannot find symbol
   symbol:   class ClassIntrospecter
-  location: class EncodingFactory
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/EndpointSessionHandler.java:[23,31] error: package io.undertow.servlet.util does not exist
-[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/JsrWebSocketFilter.java:[52,37] error: package io.undertow.servlet.websockets does not exist
+  location: class SwitchableClassIntrospector
+[ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/UndertowContainerProvider.java:[156,36] error: cannot find symbol
+  symbol:   class ClassIntrospecter
+  location: class SwitchableClassIntrospector
 [ERROR] /build/reproducible-path/undertow-2.3.18/websockets-jsr/src/main/java/io/undertow/websockets/jsr/Bootstrap.java:[21,26] error: cannot find symbol
   symbol:   class ServletExtension
   location: package io.undertow.servlet
@@ -2435,16 +2471,16 @@
 [INFO] ------------------------------------------------------------------------
 [INFO] Reactor Summary for Undertow 2.3.18.Final:
 [INFO] 
-[INFO] Undertow ........................................... SUCCESS [  3.489 s]
-[INFO] Undertow Parser Generator .......................... SUCCESS [ 10.057 s]
-[INFO] Undertow Core ...................................... SUCCESS [01:05 min]
-[INFO] Undertow Servlet ................................... SUCCESS [ 27.158 s]
-[INFO] Undertow WebSockets JSR356 implementations ......... SUCCESS [ 13.343 s]
+[INFO] Undertow ........................................... SUCCESS [  0.961 s]
+[INFO] Undertow Parser Generator .......................... SUCCESS [  2.213 s]
+[INFO] Undertow Core ...................................... SUCCESS [ 23.120 s]
+[INFO] Undertow Servlet ................................... SUCCESS [  3.832 s]
+[INFO] Undertow WebSockets JSR356 implementations ......... SUCCESS [  1.723 s]
 [INFO] ------------------------------------------------------------------------
 [INFO] BUILD SUCCESS
 [INFO] ------------------------------------------------------------------------
-[INFO] Total time:  01:59 min
-[INFO] Finished at: 2025-03-22T05:57:38Z
+[INFO] Total time:  33.139 s
+[INFO] Finished at: 2026-04-24T12:24:31Z
 [INFO] ------------------------------------------------------------------------
    debian/rules override_dh_auto_test
 make[1]: Entering directory '/build/reproducible-path/undertow-2.3.18'
@@ -2534,16 +2570,16 @@
 [INFO] ------------------------------------------------------------------------
 [INFO] Reactor Summary for Undertow 2.3.18.Final:
 [INFO] 
-[INFO] Undertow ........................................... SUCCESS [  1.924 s]
-[INFO] Undertow Parser Generator .......................... SUCCESS [  0.303 s]
-[INFO] Undertow Core ...................................... SUCCESS [  0.808 s]
-[INFO] Undertow Servlet ................................... SUCCESS [  0.253 s]
-[INFO] Undertow WebSockets JSR356 implementations ......... SUCCESS [  0.267 s]
+[INFO] Undertow ........................................... SUCCESS [  0.333 s]
+[INFO] Undertow Parser Generator .......................... SUCCESS [  0.036 s]
+[INFO] Undertow Core ...................................... SUCCESS [  0.033 s]
+[INFO] Undertow Servlet ................................... SUCCESS [  0.026 s]
+[INFO] Undertow WebSockets JSR356 implementations ......... SUCCESS [  0.029 s]
 [INFO] ------------------------------------------------------------------------
 [INFO] BUILD SUCCESS
 [INFO] ------------------------------------------------------------------------
-[INFO] Total time:  4.663 s
-[INFO] Finished at: 2025-03-22T05:57:51Z
+[INFO] Total time:  0.622 s
+[INFO] Finished at: 2026-04-24T12:24:33Z
 [INFO] ------------------------------------------------------------------------
 	mh_resolve_dependencies --non-interactive --offline --build -plibundertow-java --base-directory=/build/reproducible-path/undertow-2.3.18 --non-explore
 Analysing pom.xml...
@@ -2578,12 +2614,14 @@
 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/569167/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/569167/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/221931 and its subdirectories
-I: Current time: Fri Mar 21 17:58:39 -12 2025
-I: pbuilder-time-stamp: 1742623119
+I: removing directory /srv/workspace/pbuilder/569167 and its subdirectories
+I: Current time: Sat Apr 25 02:24:41 +14 2026
+I: pbuilder-time-stamp: 1777033481