Diff of the two buildlogs:

--
--- b1/build.log	2024-05-03 22:43:01.368323137 +0000
+++ b2/build.log	2024-05-03 22:45:36.377737664 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Thu Jun  5 17:02:47 -12 2025
-I: pbuilder-time-stamp: 1749186167
+I: Current time: Sat May  4 12:43:04 +14 2024
+I: pbuilder-time-stamp: 1714776184
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -26,51 +26,83 @@
 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/505320/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1710043/tmp/hooks/D01_modify_environment starting
+debug: Running on infom01-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  3 22:43 /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/1710043/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1710043/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'
+  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=12 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='amd64'
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='c6fb44fa7176440c83641962ca1b7657'
-  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='505320'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=034bcea54a354359bf327c959019dac6
+  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=1710043
   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.0hWHHqO5/pbuilderrc_vlfh --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.0hWHHqO5/b1 --logfile b1/build.log golang-github-pin-tftp_3.1.0-1.dsc'
-  SUDO_GID='109'
-  SUDO_UID='104'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
+  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.0hWHHqO5/pbuilderrc_uMaC --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.0hWHHqO5/b2 --logfile b2/build.log golang-github-pin-tftp_3.1.0-1.dsc'
+  SUDO_GID=109
+  SUDO_UID=104
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
 I: uname -a
-  Linux infom02-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-cloud-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  4 14:05 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/505320/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May  2 07:42 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/1710043/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -153,7 +185,7 @@
 Get: 39 http://deb.debian.org/debian unstable/main amd64 golang-golang-x-text-dev all 0.14.0-2 [4001 kB]
 Get: 40 http://deb.debian.org/debian unstable/main amd64 golang-golang-x-crypto-dev all 1:0.22.0-1 [1672 kB]
 Get: 41 http://deb.debian.org/debian unstable/main amd64 golang-golang-x-net-dev all 1:0.24.0+dfsg-1 [895 kB]
-Fetched 69.7 MB in 1s (125 MB/s)
+Fetched 69.7 MB in 2s (40.9 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 ... 19695 files and directories currently installed.)
@@ -332,7 +364,11 @@
 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/1710043/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/1710043/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
@@ -351,25 +387,25 @@
    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 12 github.com/pin/tftp github.com/pin/tftp/netascii
-internal/unsafeheader
 internal/godebugs
+internal/unsafeheader
+internal/race
+internal/goarch
 internal/goos
 internal/coverage/rtcov
 internal/goexperiment
-internal/goarch
-internal/race
-unicode
-runtime/internal/syscall
 sync/atomic
-runtime/internal/atomic
-unicode/utf8
+runtime/internal/syscall
+unicode
 internal/cpu
-internal/itoa
-math/bits
+unicode/utf8
+runtime/internal/atomic
 internal/abi
 internal/chacha8rand
 runtime/internal/math
 runtime/internal/sys
+internal/itoa
+math/bits
 cmp
 golang.org/x/net/internal/iana
 internal/nettrace
@@ -384,32 +420,32 @@
 internal/singleflight
 runtime/cgo
 errors
+internal/godebug
 sort
 io
-internal/oserror
-internal/godebug
-strconv
-vendor/golang.org/x/net/dns/dnsmessage
 internal/safefilepath
+strconv
+internal/oserror
 path
-syscall
+vendor/golang.org/x/net/dns/dnsmessage
 internal/intern
 math/rand
+syscall
 bytes
 github.com/pin/tftp/netascii
 strings
 reflect
 net/netip
 internal/syscall/execenv
-internal/syscall/unix
 time
-internal/poll
+internal/syscall/unix
 context
+internal/poll
 io/fs
+os
 encoding/binary
 internal/fmtsort
 golang.org/x/sys/unix
-os
 fmt
 net
 golang.org/x/net/bpf
@@ -422,23 +458,23 @@
 === RUN   TestZeroLengthSinglePort
 --- PASS: TestZeroLengthSinglePort (0.00s)
 === RUN   TestSendReceiveSinglePort
---- PASS: TestSendReceiveSinglePort (1.22s)
+--- PASS: TestSendReceiveSinglePort (1.09s)
 === RUN   TestSendReceiveSinglePortWithBlockSize
---- PASS: TestSendReceiveSinglePortWithBlockSize (0.97s)
+--- PASS: TestSendReceiveSinglePortWithBlockSize (0.78s)
 === RUN   TestServerSendTimeoutSinglePort
---- PASS: TestServerSendTimeoutSinglePort (8.00s)
+--- PASS: TestServerSendTimeoutSinglePort (8.01s)
 === RUN   TestServerReceiveTimeoutSinglePort
---- PASS: TestServerReceiveTimeoutSinglePort (8.01s)
+--- PASS: TestServerReceiveTimeoutSinglePort (8.02s)
 === RUN   TestAnticipateWindow900
---- PASS: TestAnticipateWindow900 (2.95s)
+--- PASS: TestAnticipateWindow900 (2.77s)
 === RUN   TestPackUnpack
 --- PASS: TestPackUnpack (0.00s)
 === RUN   TestZeroLength
 --- PASS: TestZeroLength (0.00s)
 === RUN   Test900
---- PASS: Test900 (3.39s)
+--- PASS: Test900 (3.14s)
 === RUN   Test1000
---- PASS: Test1000 (1.71s)
+--- PASS: Test1000 (1.36s)
 === RUN   Test1810
 --- PASS: Test1810 (0.00s)
 === RUN   TestHookSuccess
@@ -451,13 +487,13 @@
 Transfer size: 640
 --- PASS: TestTSize (0.00s)
 === RUN   TestNearBlockLength
---- PASS: TestNearBlockLength (0.04s)
+--- PASS: TestNearBlockLength (0.02s)
 === RUN   TestBlockWrapsAround
---- PASS: TestBlockWrapsAround (12.09s)
+--- PASS: TestBlockWrapsAround (7.80s)
 === RUN   TestRandomLength
---- PASS: TestRandomLength (0.47s)
+--- PASS: TestRandomLength (0.30s)
 === RUN   TestBigFile
---- PASS: TestBigFile (0.25s)
+--- PASS: TestBigFile (0.15s)
 === RUN   TestByOneByte
 --- PASS: TestByOneByte (0.01s)
 === RUN   TestDuplicate
@@ -474,13 +510,13 @@
 === RUN   TestNoHandlers
 --- PASS: TestNoHandlers (0.00s)
 === RUN   TestServerSendTimeout
---- PASS: TestServerSendTimeout (8.01s)
+--- PASS: TestServerSendTimeout (8.02s)
 === RUN   TestServerReceiveTimeout
 --- PASS: TestServerReceiveTimeout (8.01s)
 === RUN   TestClientReceiveTimeout
---- PASS: TestClientReceiveTimeout (8.01s)
+--- PASS: TestClientReceiveTimeout (8.02s)
 === RUN   TestClientSendTimeout
---- PASS: TestClientSendTimeout (8.01s)
+--- PASS: TestClientSendTimeout (8.00s)
 === RUN   TestRequestPacketInfo
 Done 127.0.0.1
 Done ::1
@@ -488,7 +524,7 @@
 === RUN   TestReadWriteErrors
 --- PASS: TestReadWriteErrors (0.00s)
 PASS
-ok  	github.com/pin/tftp	71.186s
+ok  	github.com/pin/tftp	65.512s
 === RUN   TestTo
 --- PASS: TestTo (0.00s)
 === RUN   TestFrom
@@ -498,7 +534,7 @@
 === RUN   TestOneByte
 --- PASS: TestOneByte (0.00s)
 PASS
-ok  	github.com/pin/tftp/netascii	0.004s
+ok  	github.com/pin/tftp/netascii	0.003s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--builddirectory=_build -O--buildsystem=golang
    dh_prep -O--builddirectory=_build -O--buildsystem=golang
@@ -525,12 +561,14 @@
 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/1710043/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1710043/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/505320 and its subdirectories
-I: Current time: Thu Jun  5 17:06:00 -12 2025
-I: pbuilder-time-stamp: 1749186360
+I: removing directory /srv/workspace/pbuilder/1710043 and its subdirectories
+I: Current time: Sat May  4 12:45:35 +14 2024
+I: pbuilder-time-stamp: 1714776335