Diff of the two buildlogs:

--
--- b1/build.log	2024-05-06 03:25:11.324937767 +0000
+++ b2/build.log	2024-05-06 03:31:30.664804355 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Jun  7 21:46:14 -12 2025
-I: pbuilder-time-stamp: 1749375974
+I: Current time: Mon May  6 17:25:14 +14 2024
+I: pbuilder-time-stamp: 1714965914
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -26,52 +26,84 @@
 dpkg-source: info: unpacking golang-github-pin-tftp_3.1.0-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3615954/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2066127/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos1-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 May  6 03:25 /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/2066127/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2066127/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=42 '
-  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]="21" [3]="1" [4]="release" [5]="x86_64-pc-linux-gnu")
+  BASH_VERSION='5.2.21(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=20 '
+  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='032401b62ba746c5ab9ce5b0e05cbd6c'
-  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='3615954'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=4aa01d97f1634d7993d02426a823d654
+  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=2066127
   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.YlRGZhVS/pbuilderrc_GY0T --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.YlRGZhVS/b1 --logfile b1/build.log golang-github-pin-tftp_3.1.0-1.dsc'
-  SUDO_GID='110'
-  SUDO_UID='105'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://213.165.73.152:3128'
+  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.YlRGZhVS/pbuilderrc_bALV --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.YlRGZhVS/b2 --logfile b2/build.log golang-github-pin-tftp_3.1.0-1.dsc'
+  SUDO_GID=110
+  SUDO_UID=105
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://46.16.76.132:3128
 I: uname -a
-  Linux ionos5-amd64 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-20-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.85-1 (2024-04-11) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Jun  7 17:46 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3615954/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May  5 11:24 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2066127/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -154,7 +186,7 @@
 Get: 39 http://deb.debian.org/debian trixie/main amd64 golang-golang-x-text-dev all 0.14.0-2 [4001 kB]
 Get: 40 http://deb.debian.org/debian trixie/main amd64 golang-golang-x-crypto-dev all 1:0.22.0-1 [1672 kB]
 Get: 41 http://deb.debian.org/debian trixie/main amd64 golang-golang-x-net-dev all 1:0.24.0+dfsg-1 [895 kB]
-Fetched 69.7 MB in 0s (154 MB/s)
+Fetched 69.7 MB in 5s (13.4 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 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 ... 19694 files and directories currently installed.)
@@ -333,7 +365,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-pin-tftp-3.1.0/ && 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  > ../golang-github-pin-tftp_3.1.0-1_source.changes
+I: user script /srv/workspace/pbuilder/2066127/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/2066127/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-pin-tftp-3.1.0/ && 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  > ../golang-github-pin-tftp_3.1.0-1_source.changes
 dpkg-buildpackage: info: source package golang-github-pin-tftp
 dpkg-buildpackage: info: source version 3.1.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -351,29 +387,29 @@
    dh_autoreconf -O--builddirectory=_build -O--buildsystem=golang
    dh_auto_configure -O--builddirectory=_build -O--buildsystem=golang
    dh_auto_build -O--builddirectory=_build -O--buildsystem=golang
-	cd _build && go install -trimpath -v -p 42 github.com/pin/tftp github.com/pin/tftp/netascii
+	cd _build && go install -trimpath -v -p 20 github.com/pin/tftp github.com/pin/tftp/netascii
 internal/unsafeheader
 internal/godebugs
-internal/goos
-internal/coverage/rtcov
+internal/nettrace
+math/bits
 internal/goarch
+unicode/utf8
 internal/itoa
 cmp
-internal/nettrace
-internal/goexperiment
-math/bits
+golang.org/x/net/internal/iana
+internal/cpu
 unicode
-unicode/utf8
+internal/goos
+internal/coverage/rtcov
+internal/goexperiment
+internal/abi
+sync/atomic
+internal/chacha8rand
+runtime/internal/math
 internal/race
 runtime/internal/syscall
-sync/atomic
-golang.org/x/net/internal/iana
-internal/cpu
 runtime/internal/atomic
-runtime/internal/math
-internal/chacha8rand
 runtime/internal/sys
-internal/abi
 slices
 internal/bytealg
 math
@@ -381,34 +417,34 @@
 internal/reflectlite
 sync
 internal/testlog
-internal/singleflight
 internal/bisect
+internal/singleflight
 runtime/cgo
-internal/godebug
 errors
-sort
-internal/oserror
 io
+internal/oserror
+sort
 internal/safefilepath
 path
-internal/intern
 vendor/golang.org/x/net/dns/dnsmessage
-math/rand
+internal/godebug
 strconv
 syscall
+internal/intern
+math/rand
 github.com/pin/tftp/netascii
-bytes
 strings
+bytes
 net/netip
 reflect
-internal/syscall/execenv
-internal/syscall/unix
 time
+internal/syscall/unix
+internal/syscall/execenv
 context
-io/fs
 internal/poll
-internal/fmtsort
+io/fs
 encoding/binary
+internal/fmtsort
 os
 golang.org/x/sys/unix
 fmt
@@ -419,77 +455,77 @@
 golang.org/x/net/ipv6
 github.com/pin/tftp
    dh_auto_test -O--builddirectory=_build -O--buildsystem=golang
-	cd _build && go test -vet=off -v -p 42 github.com/pin/tftp github.com/pin/tftp/netascii
+	cd _build && go test -vet=off -v -p 20 github.com/pin/tftp github.com/pin/tftp/netascii
 === RUN   TestZeroLengthSinglePort
 --- PASS: TestZeroLengthSinglePort (0.00s)
 === RUN   TestSendReceiveSinglePort
---- PASS: TestSendReceiveSinglePort (1.08s)
+--- PASS: TestSendReceiveSinglePort (5.18s)
 === RUN   TestSendReceiveSinglePortWithBlockSize
---- PASS: TestSendReceiveSinglePortWithBlockSize (0.83s)
+--- PASS: TestSendReceiveSinglePortWithBlockSize (4.34s)
 === RUN   TestServerSendTimeoutSinglePort
---- PASS: TestServerSendTimeoutSinglePort (8.02s)
+--- PASS: TestServerSendTimeoutSinglePort (8.01s)
 === RUN   TestServerReceiveTimeoutSinglePort
 --- PASS: TestServerReceiveTimeoutSinglePort (8.02s)
 === RUN   TestAnticipateWindow900
---- PASS: TestAnticipateWindow900 (2.56s)
+--- PASS: TestAnticipateWindow900 (17.31s)
 === RUN   TestPackUnpack
 --- PASS: TestPackUnpack (0.00s)
 === RUN   TestZeroLength
---- PASS: TestZeroLength (0.00s)
+--- PASS: TestZeroLength (0.01s)
 === RUN   Test900
---- PASS: Test900 (3.42s)
+--- PASS: Test900 (19.34s)
 === RUN   Test1000
---- PASS: Test1000 (1.60s)
+--- PASS: Test1000 (8.70s)
 === RUN   Test1810
---- PASS: Test1810 (0.00s)
+--- PASS: Test1810 (0.01s)
 === RUN   TestHookSuccess
---- PASS: TestHookSuccess (0.00s)
+--- PASS: TestHookSuccess (0.02s)
 === RUN   TestHookFailure
 File test-not-exists not found
     tftp_test.go:213: receiving file that does not exist: code: 1, message: file not found
---- PASS: TestHookFailure (0.00s)
+--- PASS: TestHookFailure (0.01s)
 === RUN   TestTSize
 Transfer size: 640
---- PASS: TestTSize (0.00s)
+--- PASS: TestTSize (0.01s)
 === RUN   TestNearBlockLength
---- PASS: TestNearBlockLength (0.03s)
+--- PASS: TestNearBlockLength (0.16s)
 === RUN   TestBlockWrapsAround
---- PASS: TestBlockWrapsAround (9.61s)
+--- PASS: TestBlockWrapsAround (56.48s)
 === RUN   TestRandomLength
---- PASS: TestRandomLength (0.42s)
+--- PASS: TestRandomLength (2.36s)
 === RUN   TestBigFile
---- PASS: TestBigFile (0.21s)
+--- PASS: TestBigFile (1.24s)
 === RUN   TestByOneByte
---- PASS: TestByOneByte (0.01s)
+--- PASS: TestByOneByte (0.06s)
 === RUN   TestDuplicate
 File test-duplicate already exists
     tftp_test.go:318: sending file that already exists: sending block 0: code=1, error: file already exists
---- PASS: TestDuplicate (0.00s)
+--- PASS: TestDuplicate (0.01s)
 === RUN   TestNotFound
 File test-not-exists not found
     tftp_test.go:330: receiving file that does not exist: code: 1, message: file not found
 --- PASS: TestNotFound (0.00s)
 === RUN   TestSendTsizeFromSeek
 Transfer size: 100
---- PASS: TestSendTsizeFromSeek (0.00s)
+--- PASS: TestSendTsizeFromSeek (0.03s)
 === RUN   TestNoHandlers
 --- PASS: TestNoHandlers (0.00s)
 === RUN   TestServerSendTimeout
 --- PASS: TestServerSendTimeout (8.02s)
 === RUN   TestServerReceiveTimeout
---- PASS: TestServerReceiveTimeout (8.02s)
+--- PASS: TestServerReceiveTimeout (8.03s)
 === RUN   TestClientReceiveTimeout
---- PASS: TestClientReceiveTimeout (8.02s)
+--- PASS: TestClientReceiveTimeout (8.04s)
 === RUN   TestClientSendTimeout
---- PASS: TestClientSendTimeout (8.02s)
+--- PASS: TestClientSendTimeout (8.04s)
 === RUN   TestRequestPacketInfo
 Done 127.0.0.1
 Done ::1
---- PASS: TestRequestPacketInfo (0.00s)
+--- PASS: TestRequestPacketInfo (0.01s)
 === RUN   TestReadWriteErrors
 --- PASS: TestReadWriteErrors (0.00s)
 PASS
-ok  	github.com/pin/tftp	67.892s
+ok  	github.com/pin/tftp	163.548s
 === RUN   TestTo
 --- PASS: TestTo (0.00s)
 === RUN   TestFrom
@@ -499,7 +535,7 @@
 === RUN   TestOneByte
 --- PASS: TestOneByte (0.00s)
 PASS
-ok  	github.com/pin/tftp/netascii	0.003s
+ok  	github.com/pin/tftp/netascii	0.040s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--builddirectory=_build -O--buildsystem=golang
    dh_prep -O--builddirectory=_build -O--buildsystem=golang
@@ -526,12 +562,14 @@
 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/2066127/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2066127/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/3615954 and its subdirectories
-I: Current time: Sat Jun  7 21:48:09 -12 2025
-I: pbuilder-time-stamp: 1749376089
+I: removing directory /srv/workspace/pbuilder/2066127 and its subdirectories
+I: Current time: Mon May  6 17:31:29 +14 2024
+I: pbuilder-time-stamp: 1714966289