Diff of the two buildlogs:

--
--- b1/build.log	2024-09-11 12:13:34.581338491 +0000
+++ b2/build.log	2024-09-11 12:15:42.619902654 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Sep 11 00:10:10 -12 2024
-I: pbuilder-time-stamp: 1726056610
+I: Current time: Thu Sep 12 02:13:43 +14 2024
+I: pbuilder-time-stamp: 1726056823
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking golang-github-docker-spdystream_0.5.0-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/23157/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/9775/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64z.
+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 Sep 11 12:13 /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/9775/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/9775/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='armhf'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=3 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='armhf'
+  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]="32" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
+  BASH_VERSION='5.2.32(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=4 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='65d89b5c270247fd983569f3de9905e7'
-  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='23157'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=786877144ddd42fab116e279d3639549
+  LANG=C
+  LANGUAGE=it_CH:it
+  LC_ALL=C
+  MACHTYPE=arm-unknown-linux-gnueabihf
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnueabihf
+  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=9775
   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.SehfAJcY/pbuilderrc_zcxV --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.SehfAJcY/b1 --logfile b1/build.log golang-github-docker-spdystream_0.5.0-1.dsc'
-  SUDO_GID='113'
-  SUDO_UID='107'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://10.0.0.15:3142/'
+  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.SehfAJcY/pbuilderrc_ks09 --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.SehfAJcY/b2 --logfile b2/build.log golang-github-docker-spdystream_0.5.0-1.dsc'
+  SUDO_GID=110
+  SUDO_UID=103
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://10.0.0.15:3142/
 I: uname -a
-  Linux ff4a 6.1.0-25-armmp-lpae #1 SMP Debian 6.1.106-3 (2024-08-26) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-25-arm64 #1 SMP Debian 6.1.106-3 (2024-08-26) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Aug  4 21:30 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/23157/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/9775/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -83,7 +115,7 @@
 Depends: debhelper-compat (= 13), dh-golang, golang-any
 dpkg-deb: building package 'pbuilder-satisfydepends-dummy' in '/tmp/satisfydepends-aptitude/pbuilder-satisfydepends-dummy.deb'.
 Selecting previously unselected package pbuilder-satisfydepends-dummy.
-(Reading database ... 19502 files and directories currently installed.)
+(Reading database ... 19456 files and directories currently installed.)
 Preparing to unpack .../pbuilder-satisfydepends-dummy.deb ...
 Unpacking pbuilder-satisfydepends-dummy (0.invalid.0) ...
 dpkg: pbuilder-satisfydepends-dummy: dependency problems, but configuring anyway as you requested:
@@ -145,10 +177,10 @@
 Get: 33 http://deb.debian.org/debian unstable/main armhf golang-src all 2:1.22~3 [5020 B]
 Get: 34 http://deb.debian.org/debian unstable/main armhf golang-go armhf 2:1.22~3 [44.2 kB]
 Get: 35 http://deb.debian.org/debian unstable/main armhf golang-any armhf 2:1.22~3 [5104 B]
-Fetched 59.5 MB in 4s (16.9 MB/s)
+Fetched 59.5 MB in 3s (21.7 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package sensible-utils.
-(Reading database ... 
(Reading database ... 5%
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(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19502 files and directories currently installed.)
+(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%
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(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19456 files and directories currently installed.)
 Preparing to unpack .../00-sensible-utils_0.0.24_all.deb ...
 Unpacking sensible-utils (0.0.24) ...
 Selecting previously unselected package libmagic-mgc.
@@ -300,7 +332,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-docker-spdystream-0.5.0/ && 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-docker-spdystream_0.5.0-1_source.changes
+I: user script /srv/workspace/pbuilder/9775/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/9775/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-docker-spdystream-0.5.0/ && 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-docker-spdystream_0.5.0-1_source.changes
 dpkg-buildpackage: info: source package golang-github-docker-spdystream
 dpkg-buildpackage: info: source version 0.5.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -318,115 +354,104 @@
    dh_autoreconf -O--buildsystem=golang
    dh_auto_configure -O--buildsystem=golang
    dh_auto_build -O--buildsystem=golang
-	cd obj-arm-linux-gnueabihf && go install -trimpath -v -p 3 github.com/moby/spdystream github.com/moby/spdystream/spdy
-internal/unsafeheader
+	cd obj-arm-linux-gnueabihf && go install -trimpath -v -p 4 github.com/moby/spdystream github.com/moby/spdystream/spdy
 internal/goarch
-internal/cpu
 internal/coverage/rtcov
-internal/abi
-internal/chacha8rand
-internal/bytealg
+internal/cpu
+internal/unsafeheader
 internal/godebugs
 internal/goexperiment
+internal/abi
+internal/chacha8rand
 internal/goos
-runtime/internal/atomic
 runtime/internal/math
+internal/bytealg
+runtime/internal/atomic
 runtime/internal/sys
 runtime/internal/syscall
 math/bits
 cmp
 internal/itoa
-slices
-math
 unicode/utf8
 internal/race
+slices
+math
 sync/atomic
 unicode
-runtime
 container/list
 crypto/internal/alias
 crypto/internal/boring/sig
+runtime
 unicode/utf16
 vendor/golang.org/x/crypto/cryptobyte/asn1
 internal/nettrace
 vendor/golang.org/x/crypto/internal/alias
 log/internal
+sync
 crypto/subtle
 internal/reflectlite
-sync
 internal/testlog
-internal/bisect
 internal/singleflight
+internal/bisect
 runtime/cgo
+internal/godebug
 sort
 errors
 strconv
+math/rand
 container/heap
 io
 internal/oserror
 syscall
 reflect
-internal/syscall/unix
-time
 internal/safefilepath
-internal/syscall/execenv
 path
 bytes
 strings
-internal/fmtsort
-internal/poll
-io/fs
+internal/syscall/unix
+time
+internal/syscall/execenv
 bufio
-encoding/binary
 hash
+crypto/internal/randutil
+crypto/internal/nistec/fiat
 hash/adler32
-os
 hash/crc32
-context
 crypto
+crypto/rc4
+vendor/golang.org/x/net/dns/dnsmessage
+internal/poll
+internal/fmtsort
+io/fs
+encoding/binary
+context
+os
+internal/intern
+net/netip
 crypto/cipher
-crypto/internal/randutil
-internal/godebug
 crypto/internal/boring
-math/rand
 crypto/aes
 crypto/des
-fmt
 crypto/internal/edwards25519/field
-crypto/internal/nistec/fiat
 crypto/sha512
+fmt
+crypto/internal/nistec
 crypto/internal/edwards25519
 crypto/hmac
 crypto/md5
-compress/flate
-math/big
-compress/zlib
-compress/gzip
-crypto/rc4
 crypto/sha1
 crypto/sha256
-encoding/hex
 encoding/base64
+net
 encoding/pem
-vendor/golang.org/x/net/dns/dnsmessage
-crypto/rand
-crypto/internal/nistec
-crypto/internal/bigmod
-crypto/internal/boring/bbig
-encoding/asn1
-crypto/ed25519
-crypto/rsa
-crypto/dsa
 crypto/ecdh
-crypto/elliptic
-vendor/golang.org/x/crypto/cryptobyte
-crypto/x509/pkix
-internal/intern
-net/netip
+compress/flate
+math/big
+encoding/hex
 net/url
-crypto/ecdsa
 path/filepath
-net
+compress/zlib
+compress/gzip
 vendor/golang.org/x/crypto/chacha20
 vendor/golang.org/x/crypto/internal/poly1305
 vendor/golang.org/x/crypto/hkdf
@@ -435,10 +460,21 @@
 log
 vendor/golang.org/x/text/unicode/norm
 vendor/golang.org/x/text/unicode/bidi
+crypto/rand
+crypto/elliptic
+crypto/internal/bigmod
+crypto/internal/boring/bbig
+encoding/asn1
+crypto/ed25519
+crypto/rsa
+crypto/dsa
 vendor/golang.org/x/text/secure/bidirule
+vendor/golang.org/x/net/idna
 vendor/golang.org/x/net/http2/hpack
+vendor/golang.org/x/crypto/cryptobyte
+crypto/x509/pkix
 mime
-vendor/golang.org/x/net/idna
+crypto/ecdsa
 mime/quotedprintable
 net/http/internal
 net/http/internal/ascii
@@ -453,7 +489,7 @@
 github.com/moby/spdystream/spdy
 github.com/moby/spdystream
    dh_auto_test -O--buildsystem=golang
-	cd obj-arm-linux-gnueabihf && go test -vet=off -v -p 3 github.com/moby/spdystream github.com/moby/spdystream/spdy
+	cd obj-arm-linux-gnueabihf && go test -vet=off -v -p 4 github.com/moby/spdystream github.com/moby/spdystream/spdy
 === RUN   TestPriorityQueueOrdering
 --- PASS: TestPriorityQueueOrdering (0.00s)
 === RUN   TestPriorityQueueSync
@@ -465,7 +501,7 @@
 === RUN   TestPing
 --- PASS: TestPing (0.00s)
 === RUN   TestHalfClose
---- PASS: TestHalfClose (0.01s)
+--- PASS: TestHalfClose (0.00s)
 === RUN   TestUnexpectedRemoteConnectionClosed
 --- PASS: TestUnexpectedRemoteConnectionClosed (0.01s)
 === RUN   TestCloseNotification
@@ -479,27 +515,27 @@
 === RUN   TestIdleNoData
 --- PASS: TestIdleNoData (0.01s)
 === RUN   TestIdleWithData
---- PASS: TestIdleWithData (0.13s)
+--- PASS: TestIdleWithData (0.12s)
 === RUN   TestIdleRace
---- PASS: TestIdleRace (0.03s)
+--- PASS: TestIdleRace (0.02s)
 === RUN   TestHalfClosedIdleTimeout
 --- PASS: TestHalfClosedIdleTimeout (0.02s)
 === RUN   TestStreamReset
---- PASS: TestStreamReset (0.01s)
+--- PASS: TestStreamReset (0.00s)
 === RUN   TestStreamResetWithDataRemaining
---- PASS: TestStreamResetWithDataRemaining (0.01s)
+--- PASS: TestStreamResetWithDataRemaining (0.00s)
 === RUN   TestFramingAfterRemoteConnectionClosed
 --- PASS: TestFramingAfterRemoteConnectionClosed (0.00s)
 === RUN   TestGoAwayRace
---- PASS: TestGoAwayRace (0.01s)
+--- PASS: TestGoAwayRace (0.00s)
 === RUN   TestSetIdleTimeoutAfterRemoteConnectionClosed
 --- PASS: TestSetIdleTimeoutAfterRemoteConnectionClosed (0.00s)
 === RUN   TestClientConnectionStopsServingAfterGoAway
 --- PASS: TestClientConnectionStopsServingAfterGoAway (0.00s)
 === RUN   TestStreamReadUnblocksAfterCloseThenReset
---- PASS: TestStreamReadUnblocksAfterCloseThenReset (0.01s)
+--- PASS: TestStreamReadUnblocksAfterCloseThenReset (0.00s)
 PASS
-ok  	github.com/moby/spdystream	0.337s
+ok  	github.com/moby/spdystream	0.269s
 === RUN   TestHeaderParsing
 --- PASS: TestHeaderParsing (0.00s)
 === RUN   TestCreateParseSynStreamFrameCompressionDisable
@@ -529,14 +565,14 @@
 === RUN   TestCompressionContextAcrossFrames
 --- PASS: TestCompressionContextAcrossFrames (0.00s)
 === RUN   TestMultipleSPDYFrames
---- PASS: TestMultipleSPDYFrames (0.01s)
+--- PASS: TestMultipleSPDYFrames (0.00s)
 === RUN   TestReadMalformedZlibHeader
 --- PASS: TestReadMalformedZlibHeader (0.00s)
 === RUN   TestNoZeroStreamId
     spdy_test.go:633: TODO: update to work with SPDY3
 --- SKIP: TestNoZeroStreamId (0.00s)
 PASS
-ok  	github.com/moby/spdystream/spdy	0.028s
+ok  	github.com/moby/spdystream/spdy	0.018s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=golang
    dh_prep -O--buildsystem=golang
@@ -563,12 +599,14 @@
 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/9775/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/9775/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/23157 and its subdirectories
-I: Current time: Wed Sep 11 00:13:30 -12 2024
-I: pbuilder-time-stamp: 1726056810
+I: removing directory /srv/workspace/pbuilder/9775 and its subdirectories
+I: Current time: Thu Sep 12 02:15:39 +14 2024
+I: pbuilder-time-stamp: 1726056939