Diff of the two buildlogs:

--
--- b1/build.log	2025-02-09 01:13:43.046082231 +0000
+++ b2/build.log	2025-02-09 01:14:59.618619761 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Feb  8 13:12:53 -12 2025
-I: pbuilder-time-stamp: 1739063573
+I: Current time: Sat Mar 14 21:36:45 +14 2026
+I: pbuilder-time-stamp: 1773473805
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 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/1144999/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/323459/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink03-arm64.
+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 Mar 14 07:36 /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/323459/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/323459/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='arm64'
-  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]="37" [3]="1" [4]="release" [5]="aarch64-unknown-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=arm64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=12 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='dd5b0a5ae1bd481c8c062e6a2568e9ad'
-  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='1144999'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=ca1ca483a280435b9bfd51bd8e77ca17
+  LANG=C
+  LANGUAGE=nl_BE:nl
+  LC_ALL=C
+  MACHTYPE=aarch64-unknown-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=323459
   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.F4i47HMb/pbuilderrc_5KaF --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.F4i47HMb/b1 --logfile b1/build.log golang-github-docker-spdystream_0.5.0-1.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'
-  http_proxy='http://192.168.101.4:3128'
+  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.F4i47HMb/pbuilderrc_1yUk --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.F4i47HMb/b2 --logfile b2/build.log golang-github-docker-spdystream_0.5.0-1.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'
+  http_proxy=http://192.168.101.4:3128
 I: uname -a
-  Linux codethink04-arm64 6.1.0-30-cloud-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-30-cloud-arm64 #1 SMP Debian 6.1.124-1 (2025-01-12) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1144999/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/323459/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -143,7 +175,7 @@
 Get: 34 http://deb.debian.org/debian trixie/main arm64 golang-src all 2:1.23~2 [5088 B]
 Get: 35 http://deb.debian.org/debian trixie/main arm64 golang-go arm64 2:1.23~2 [44.3 kB]
 Get: 36 http://deb.debian.org/debian trixie/main arm64 golang-any arm64 2:1.23~2 [5172 B]
-Fetched 62.8 MB in 0s (239 MB/s)
+Fetched 62.8 MB in 1s (120 MB/s)
 Preconfiguring packages ...
 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 ... 19956 files and directories currently installed.)
@@ -302,7 +334,11 @@
 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/323459/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/323459/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
@@ -321,126 +357,126 @@
    dh_auto_configure -O--buildsystem=golang
    dh_auto_build -O--buildsystem=golang
 	cd obj-aarch64-linux-gnu && go install -trimpath -v -p 12 github.com/moby/spdystream github.com/moby/spdystream/spdy
-internal/cpu
+cmp
+internal/byteorder
 internal/goarch
+math/bits
+internal/coverage/rtcov
+internal/unsafeheader
+internal/goexperiment
+internal/race
 internal/profilerecord
-internal/byteorder
 internal/runtime/syscall
-internal/goexperiment
-internal/unsafeheader
-internal/coverage/rtcov
-cmp
-internal/godebugs
-math/bits
+internal/cpu
 internal/goos
-internal/race
+internal/godebugs
+internal/chacha8rand
+internal/abi
+runtime/internal/math
 internal/itoa
 unicode/utf8
 sync/atomic
-internal/abi
-internal/chacha8rand
-runtime/internal/math
-runtime/internal/sys
-unicode
+math
 internal/asan
+unicode
 internal/msan
 container/list
 crypto/internal/alias
 crypto/subtle
 crypto/internal/boring/sig
-internal/runtime/atomic
-internal/bytealg
-math
 unicode/utf16
+runtime/internal/sys
 vendor/golang.org/x/crypto/cryptobyte/asn1
 vendor/golang.org/x/crypto/internal/alias
 internal/nettrace
 log/internal
+internal/bytealg
+internal/runtime/atomic
 internal/runtime/exithook
 internal/stringslite
 runtime
 internal/reflectlite
 iter
-internal/weak
 sync
+internal/weak
 slices
 maps
 internal/bisect
-internal/singleflight
 internal/testlog
+internal/singleflight
+runtime/cgo
+internal/godebug
 sort
 errors
-runtime/cgo
-internal/oserror
-crypto/internal/edwards25519/field
+strconv
 io
-vendor/golang.org/x/net/dns/dnsmessage
+math/rand/v2
+math/rand
+internal/oserror
 path
+crypto/internal/edwards25519/field
 crypto/internal/nistec/fiat
-strconv
-math/rand/v2
-internal/godebug
+vendor/golang.org/x/net/dns/dnsmessage
 container/heap
-reflect
-strings
+syscall
 bytes
+strings
 hash
-math/rand
-syscall
 crypto/internal/randutil
+crypto/internal/edwards25519
+internal/concurrent
+reflect
 hash/adler32
 hash/crc32
-crypto/internal/edwards25519
+bufio
 crypto
-crypto/rc4
-crypto/md5
-internal/concurrent
 crypto/cipher
 vendor/golang.org/x/text/transform
+crypto/rc4
 unique
-bufio
 net/http/internal/ascii
+crypto/md5
 crypto/internal/boring
 crypto/des
 net/netip
 crypto/aes
+crypto/hmac
 crypto/sha1
 crypto/sha256
 crypto/sha512
-crypto/hmac
 vendor/golang.org/x/crypto/hkdf
-internal/syscall/execenv
 time
 internal/syscall/unix
-internal/fmtsort
-encoding/binary
-context
+internal/syscall/execenv
 io/fs
+context
 internal/poll
-vendor/golang.org/x/crypto/internal/poly1305
-vendor/golang.org/x/crypto/chacha20
-encoding/base64
 internal/filepathlite
 embed
-encoding/pem
-vendor/golang.org/x/crypto/chacha20poly1305
+internal/fmtsort
+encoding/binary
 crypto/internal/nistec
 os
+vendor/golang.org/x/crypto/chacha20
+vendor/golang.org/x/crypto/internal/poly1305
+encoding/base64
+encoding/pem
 crypto/ecdh
-vendor/golang.org/x/sys/cpu
-path/filepath
+vendor/golang.org/x/crypto/chacha20poly1305
 fmt
+path/filepath
+vendor/golang.org/x/sys/cpu
 net
 vendor/golang.org/x/crypto/sha3
-encoding/hex
 compress/flate
-net/url
-log
-mime/quotedprintable
 math/big
-net/http/internal
+encoding/hex
+log
 vendor/golang.org/x/net/http2/hpack
 mime
+net/http/internal
+mime/quotedprintable
+net/url
 vendor/golang.org/x/text/unicode/norm
 vendor/golang.org/x/text/unicode/bidi
 compress/zlib
@@ -448,21 +484,21 @@
 vendor/golang.org/x/text/secure/bidirule
 vendor/golang.org/x/net/idna
 crypto/rand
+crypto/elliptic
 crypto/internal/bigmod
 crypto/internal/boring/bbig
-crypto/dsa
 encoding/asn1
-crypto/elliptic
+crypto/dsa
 crypto/ed25519
 crypto/internal/hpke
 crypto/internal/mlkem768
 crypto/rsa
-crypto/x509/pkix
 vendor/golang.org/x/crypto/cryptobyte
+crypto/x509/pkix
 crypto/ecdsa
-vendor/golang.org/x/net/http/httpproxy
-net/textproto
 crypto/x509
+net/textproto
+vendor/golang.org/x/net/http/httpproxy
 vendor/golang.org/x/net/http/httpguts
 mime/multipart
 crypto/tls
@@ -483,9 +519,9 @@
 === RUN   TestPing
 --- PASS: TestPing (0.00s)
 === RUN   TestHalfClose
---- PASS: TestHalfClose (0.00s)
+--- PASS: TestHalfClose (0.01s)
 === RUN   TestUnexpectedRemoteConnectionClosed
---- PASS: TestUnexpectedRemoteConnectionClosed (0.01s)
+--- PASS: TestUnexpectedRemoteConnectionClosed (0.06s)
 === RUN   TestCloseNotification
 --- PASS: TestCloseNotification (0.00s)
 === RUN   TestIdleShutdownRace
@@ -497,19 +533,19 @@
 === RUN   TestIdleNoData
 --- PASS: TestIdleNoData (0.01s)
 === RUN   TestIdleWithData
---- PASS: TestIdleWithData (0.12s)
+--- PASS: TestIdleWithData (0.14s)
 === RUN   TestIdleRace
---- PASS: TestIdleRace (0.01s)
+--- PASS: TestIdleRace (0.03s)
 === RUN   TestHalfClosedIdleTimeout
---- PASS: TestHalfClosedIdleTimeout (0.02s)
+--- PASS: TestHalfClosedIdleTimeout (0.03s)
 === RUN   TestStreamReset
---- PASS: TestStreamReset (0.00s)
+--- PASS: TestStreamReset (0.03s)
 === RUN   TestStreamResetWithDataRemaining
---- PASS: TestStreamResetWithDataRemaining (0.00s)
+--- PASS: TestStreamResetWithDataRemaining (0.02s)
 === RUN   TestFramingAfterRemoteConnectionClosed
 --- PASS: TestFramingAfterRemoteConnectionClosed (0.00s)
 === RUN   TestGoAwayRace
---- PASS: TestGoAwayRace (0.00s)
+--- PASS: TestGoAwayRace (0.03s)
 === RUN   TestSetIdleTimeoutAfterRemoteConnectionClosed
 --- PASS: TestSetIdleTimeoutAfterRemoteConnectionClosed (0.00s)
 === RUN   TestClientConnectionStopsServingAfterGoAway
@@ -517,7 +553,7 @@
 === RUN   TestStreamReadUnblocksAfterCloseThenReset
 --- PASS: TestStreamReadUnblocksAfterCloseThenReset (0.00s)
 PASS
-ok  	github.com/moby/spdystream	0.275s
+ok  	github.com/moby/spdystream	0.488s
 === RUN   TestHeaderParsing
 --- PASS: TestHeaderParsing (0.00s)
 === RUN   TestCreateParseSynStreamFrameCompressionDisable
@@ -545,16 +581,16 @@
 === RUN   TestCreateParseDataFrame
 --- PASS: TestCreateParseDataFrame (0.00s)
 === RUN   TestCompressionContextAcrossFrames
---- PASS: TestCompressionContextAcrossFrames (0.00s)
+--- PASS: TestCompressionContextAcrossFrames (0.02s)
 === RUN   TestMultipleSPDYFrames
---- PASS: TestMultipleSPDYFrames (0.00s)
+--- PASS: TestMultipleSPDYFrames (0.01s)
 === 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	0.025s
+ok  	github.com/moby/spdystream/spdy	0.083s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=golang
    dh_prep -O--buildsystem=golang
@@ -581,12 +617,14 @@
 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/323459/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/323459/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/1144999 and its subdirectories
-I: Current time: Sat Feb  8 13:13:42 -12 2025
-I: pbuilder-time-stamp: 1739063622
+I: removing directory /srv/workspace/pbuilder/323459 and its subdirectories
+I: Current time: Sat Mar 14 21:37:58 +14 2026
+I: pbuilder-time-stamp: 1773473878