Diff of the two buildlogs:

--
--- b1/build.log	2024-05-21 03:00:26.603897484 +0000
+++ b2/build.log	2024-05-21 03:02:30.410626006 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon May 20 14:55:27 -12 2024
-I: pbuilder-time-stamp: 1716260127
+I: Current time: Mon Jun 23 23:23:30 +14 2025
+I: pbuilder-time-stamp: 1750670610
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -27,52 +27,84 @@
 dpkg-source: info: applying 0001-update-test-fixture-paths.patch
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3200313/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3397450/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 Jun 23 09:23 /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/3397450/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3397450/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='unstable'
-  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=42 '
+  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='dc82c803775d402092354acf94b22c2c'
-  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='3200313'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=8f5f2acdf5ca410cb81ef67fe63ef4b3
+  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=3397450
   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.wt52F03i/pbuilderrc_Mo8N --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.wt52F03i/b1 --logfile b1/build.log golang-github-facebookgo-httpdown_0.0~git20160323.0.a3b1354-8.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://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.wt52F03i/pbuilderrc_5H9R --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.wt52F03i/b2 --logfile b2/build.log golang-github-facebookgo-httpdown_0.0~git20160323.0.a3b1354-8.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 ionos1-amd64 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 19 07:43 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3200313/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Jun 22 14:05 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3397450/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -168,7 +200,7 @@
 Get: 46 http://deb.debian.org/debian unstable/main amd64 golang-github-facebookgo-ensure-dev all 0.0~git20160127.0.b4ab57d-6 [7076 B]
 Get: 47 http://deb.debian.org/debian unstable/main amd64 golang-github-facebookgo-freeport-dev all 0.0~git20150612.0.d4adf43-7 [3520 B]
 Get: 48 http://deb.debian.org/debian unstable/main amd64 golang-github-facebookgo-stats-dev all 0.0~git20151006.0.1b76add-7 [6480 B]
-Fetched 62.9 MB in 6s (10.1 MB/s)
+Fetched 62.9 MB in 0s (128 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sensible-utils.
 (Reading database ... 
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(Reading database ... 100%
(Reading database ... 19718 files and directories currently installed.)
@@ -380,7 +412,11 @@
 fakeroot is already the newest version (1.34-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-facebookgo-httpdown-0.0~git20160323.0.a3b1354/ && 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-facebookgo-httpdown_0.0~git20160323.0.a3b1354-8_source.changes
+I: user script /srv/workspace/pbuilder/3397450/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/3397450/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-facebookgo-httpdown-0.0~git20160323.0.a3b1354/ && 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-facebookgo-httpdown_0.0~git20160323.0.a3b1354-8_source.changes
 dpkg-buildpackage: info: source package golang-github-facebookgo-httpdown
 dpkg-buildpackage: info: source version 0.0~git20160323.0.a3b1354-8
 dpkg-buildpackage: info: source distribution unstable
@@ -398,36 +434,36 @@
    dh_autoreconf -O--buildsystem=golang
    dh_auto_configure -O--buildsystem=golang
    dh_auto_build -O--buildsystem=golang
-	cd obj-x86_64-linux-gnu && go install -trimpath -v -p 20 github.com/facebookgo/httpdown
-internal/goarch
-internal/unsafeheader
+	cd obj-x86_64-linux-gnu && go install -trimpath -v -p 42 github.com/facebookgo/httpdown
 internal/coverage/rtcov
-internal/race
-cmp
-internal/godebugs
-internal/goexperiment
-internal/goos
-runtime/internal/atomic
-runtime/internal/syscall
+internal/unsafeheader
+crypto/internal/alias
+internal/itoa
+container/list
 crypto/internal/boring/sig
-internal/cpu
-internal/chacha8rand
-runtime/internal/math
+unicode/utf8
+runtime/internal/syscall
 unicode/utf16
 vendor/golang.org/x/crypto/cryptobyte/asn1
-internal/nettrace
 vendor/golang.org/x/crypto/internal/alias
-internal/itoa
-log/internal
 crypto/subtle
-container/list
-unicode/utf8
+log/internal
+internal/goarch
+internal/goos
+runtime/internal/atomic
+internal/nettrace
+cmp
+internal/godebugs
 sync/atomic
-crypto/internal/alias
-runtime/internal/sys
-unicode
+internal/cpu
 math/bits
+internal/goexperiment
+internal/race
+unicode
+runtime/internal/math
+internal/chacha8rand
 internal/abi
+runtime/internal/sys
 slices
 internal/bytealg
 math
@@ -435,95 +471,95 @@
 internal/reflectlite
 sync
 internal/testlog
-internal/bisect
 internal/singleflight
+internal/bisect
 runtime/cgo
+internal/godebug
 errors
 sort
-io
 internal/oserror
-internal/godebug
+io
 strconv
+crypto/internal/nistec/fiat
 internal/safefilepath
+internal/intern
 path
 vendor/golang.org/x/net/dns/dnsmessage
-crypto/internal/nistec/fiat
-internal/intern
-syscall
 math/rand
+crypto/internal/randutil
+crypto/rc4
 hash
 bytes
 strings
-crypto/internal/randutil
-hash/crc32
-crypto
-crypto/rc4
 reflect
+syscall
+crypto
+vendor/golang.org/x/text/transform
 net/netip
+hash/crc32
 net/http/internal/ascii
 bufio
-vendor/golang.org/x/text/transform
 internal/syscall/execenv
-time
 internal/syscall/unix
-encoding/binary
+time
 internal/fmtsort
+encoding/binary
 context
+github.com/facebookgo/clock
 io/fs
 internal/poll
-github.com/facebookgo/clock
 embed
-crypto/cipher
-crypto/internal/edwards25519/field
-encoding/base64
 crypto/md5
+encoding/base64
+crypto/internal/edwards25519/field
 vendor/golang.org/x/crypto/internal/poly1305
+crypto/cipher
 crypto/internal/nistec
-os
 encoding/pem
-crypto/internal/boring
+os
 crypto/des
 vendor/golang.org/x/crypto/chacha20
-crypto/aes
+crypto/internal/boring
 crypto/hmac
-crypto/sha512
 crypto/sha1
+crypto/aes
 crypto/sha256
-crypto/internal/edwards25519
+crypto/sha512
 vendor/golang.org/x/crypto/hkdf
+crypto/internal/edwards25519
 crypto/ecdh
-fmt
+os/signal
 path/filepath
 vendor/golang.org/x/sys/cpu
-os/signal
-net
-vendor/golang.org/x/crypto/chacha20poly1305
+fmt
 encoding/hex
 net/url
-github.com/facebookgo/stats
-compress/flate
 log
-vendor/golang.org/x/net/http2/hpack
 mime/quotedprintable
 net/http/internal
+github.com/facebookgo/stats
 mime
+vendor/golang.org/x/net/http2/hpack
+compress/flate
 vendor/golang.org/x/text/unicode/norm
 math/big
 vendor/golang.org/x/text/unicode/bidi
+vendor/golang.org/x/crypto/chacha20poly1305
 compress/gzip
 vendor/golang.org/x/text/secure/bidirule
 vendor/golang.org/x/net/idna
-crypto/elliptic
 crypto/internal/boring/bbig
-crypto/rand
+crypto/elliptic
 crypto/dsa
-encoding/asn1
 crypto/internal/bigmod
+crypto/rand
+encoding/asn1
 crypto/ed25519
 crypto/rsa
-vendor/golang.org/x/crypto/cryptobyte
 crypto/x509/pkix
+vendor/golang.org/x/crypto/cryptobyte
 crypto/ecdsa
+net
 vendor/golang.org/x/net/http/httpproxy
 net/textproto
 crypto/x509
@@ -534,7 +570,7 @@
 net/http
 github.com/facebookgo/httpdown
    dh_auto_test -O--buildsystem=golang
-	cd obj-x86_64-linux-gnu && go test -vet=off -v -p 20 github.com/facebookgo/httpdown
+	cd obj-x86_64-linux-gnu && go test -vet=off -v -p 42 github.com/facebookgo/httpdown
 === RUN   TestHTTPStopWithNoRequest
 === PAUSE TestHTTPStopWithNoRequest
 === RUN   TestHTTPStopWithFinishedRequest
@@ -566,37 +602,37 @@
 === RUN   TestTLS
 === PAUSE TestTLS
 === CONT  TestHTTPStopWithNoRequest
+=== CONT  TestHTTPKillTimeout
 === CONT  TestTLS
-=== CONT  TestHTTPStopTimeoutMissed
-=== CONT  TestHTTPWithinStopTimeout
 === CONT  TestHTTPSDefaultListenError
-=== CONT  TestHTTPServeError
+=== CONT  TestHTTPStopWithFinishedRequest
+=== CONT  TestHTTPStopWithActiveRequest
+--- PASS: TestHTTPStopWithNoRequest (0.00s)
 === CONT  TestHTTPListenerCloseError
+=== CONT  TestHTTPStopTimeoutMissed
 === CONT  TestNewRequestAfterStop
-=== CONT  TestHTTPStopWithActiveRequest
-=== CONT  TestHTTPStopWithFinishedRequest
 --- PASS: TestHTTPSDefaultListenError (0.00s)
 === CONT  TestHTTPDefaultListenError
---- PASS: TestHTTPStopWithNoRequest (0.00s)
+=== CONT  TestHTTPWithinStopTimeout
 --- PASS: TestHTTPDefaultListenError (0.00s)
 === CONT  TestExistingConnState
-=== CONT  TestDoubleStop
---- PASS: TestHTTPServeError (0.00s)
+=== CONT  TestHTTPServeError
 --- PASS: TestHTTPListenerCloseError (0.00s)
+--- PASS: TestHTTPServeError (0.00s)
+=== CONT  TestDoubleStop
 === CONT  TestHTTPKillTimeoutMissed
-=== CONT  TestHTTPKillTimeout
 --- PASS: TestDoubleStop (0.00s)
---- PASS: TestHTTPStopWithFinishedRequest (0.13s)
---- PASS: TestHTTPStopWithActiveRequest (0.27s)
---- PASS: TestHTTPStopTimeoutMissed (0.27s)
---- PASS: TestHTTPWithinStopTimeout (0.27s)
---- PASS: TestHTTPKillTimeoutMissed (0.27s)
---- PASS: TestNewRequestAfterStop (0.27s)
---- PASS: TestExistingConnState (0.27s)
---- PASS: TestHTTPKillTimeout (0.27s)
---- PASS: TestTLS (0.28s)
+--- PASS: TestHTTPKillTimeout (0.00s)
+--- PASS: TestExistingConnState (0.00s)
+--- PASS: TestNewRequestAfterStop (0.00s)
+--- PASS: TestHTTPStopWithActiveRequest (0.00s)
+--- PASS: TestHTTPStopWithFinishedRequest (0.00s)
+--- PASS: TestHTTPWithinStopTimeout (0.00s)
+--- PASS: TestHTTPStopTimeoutMissed (0.00s)
+--- PASS: TestHTTPKillTimeoutMissed (0.01s)
+--- PASS: TestTLS (0.01s)
 PASS
-ok  	github.com/facebookgo/httpdown	0.319s
+ok  	github.com/facebookgo/httpdown	0.020s
    create-stamp debian/debhelper-build-stamp
  fakeroot debian/rules binary
 dh binary --buildsystem=golang --with=golang
@@ -628,12 +664,14 @@
 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/3397450/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3397450/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/3200313 and its subdirectories
-I: Current time: Mon May 20 15:00:23 -12 2024
-I: pbuilder-time-stamp: 1716260423
+I: removing directory /srv/workspace/pbuilder/3397450 and its subdirectories
+I: Current time: Mon Jun 23 23:25:29 +14 2025
+I: pbuilder-time-stamp: 1750670729