Diff of the two buildlogs:

--
--- b1/build.log	2024-12-15 17:06:58.790004812 +0000
+++ b2/build.log	2024-12-15 17:07:56.631374860 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Dec 15 05:04:31 -12 2024
-I: pbuilder-time-stamp: 1734282271
+I: Current time: Sun Jan 18 13:30:00 +14 2026
+I: pbuilder-time-stamp: 1768692600
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -27,54 +27,86 @@
 dpkg-source: info: unpacking golang-github-gorilla-websocket_1.5.3-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/10397/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/23424/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos6-i386.
+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 Jan 17 23:30 /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/23424/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/23424/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='i386'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=11 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='i386'
+  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]="i686-pc-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=i386
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=21 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=i686
+  HOST_ARCH=i386
   IFS=' 	
   '
-  INVOCATION_ID='d216c1e1b78943bb83a2adb2d3dfe0a8'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  LD_LIBRARY_PATH='/usr/lib/libeatmydata'
-  LD_PRELOAD='libeatmydata.so'
-  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='10397'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=80c88239e53d4524adb99101d6855779
+  LANG=C
+  LANGUAGE=de_CH:de
+  LC_ALL=C
+  LD_LIBRARY_PATH=/usr/lib/libeatmydata
+  LD_PRELOAD=libeatmydata.so
+  MACHTYPE=i686-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=23424
   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.UdXzPESP/pbuilderrc_6dUr --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.UdXzPESP/b1 --logfile b1/build.log golang-github-gorilla-websocket_1.5.3-1.dsc'
-  SUDO_GID='112'
-  SUDO_UID='107'
-  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.UdXzPESP/pbuilderrc_mln0 --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.UdXzPESP/b2 --logfile b2/build.log golang-github-gorilla-websocket_1.5.3-1.dsc'
+  SUDO_GID=112
+  SUDO_UID=107
+  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 ionos12-i386 6.1.0-28-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.119-1 (2024-11-22) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-28-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.119-1 (2024-11-22) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/10397/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/23424/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -156,7 +188,7 @@
 Get: 38 http://deb.debian.org/debian unstable/main i386 golang-golang-x-text-dev all 0.16.0-1 [4003 kB]
 Get: 39 http://deb.debian.org/debian unstable/main i386 golang-golang-x-crypto-dev all 1:0.25.0-1 [1682 kB]
 Get: 40 http://deb.debian.org/debian unstable/main i386 golang-golang-x-net-dev all 1:0.27.0-1 [898 kB]
-Fetched 71.4 MB in 3s (27.4 MB/s)
+Fetched 71.4 MB in 1s (49.8 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 ... 19952 files and directories currently installed.)
@@ -331,7 +363,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-gorilla-websocket-1.5.3/ && 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-gorilla-websocket_1.5.3-1_source.changes
+I: user script /srv/workspace/pbuilder/23424/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/23424/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-gorilla-websocket-1.5.3/ && 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-gorilla-websocket_1.5.3-1_source.changes
 dpkg-buildpackage: info: source package golang-github-gorilla-websocket
 dpkg-buildpackage: info: source version 1.5.3-1
 dpkg-buildpackage: info: source distribution unstable
@@ -349,144 +385,144 @@
    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 11 github.com/gorilla/websocket
-internal/profilerecord
-internal/godebugs
+	cd _build && go install -trimpath -v -p 21 github.com/gorilla/websocket
+crypto/internal/alias
+internal/itoa
 internal/byteorder
-internal/goarch
+internal/godebugs
 internal/goos
-internal/unsafeheader
+internal/profilerecord
 internal/coverage/rtcov
-internal/goexperiment
-internal/race
-runtime/internal/math
+cmp
+internal/unsafeheader
+internal/goarch
+internal/msan
+unicode/utf8
 internal/runtime/syscall
-runtime/internal/sys
-internal/runtime/atomic
+internal/race
+internal/asan
+internal/goexperiment
+math/bits
 internal/cpu
-internal/abi
 sync/atomic
-internal/chacha8rand
-unicode
-unicode/utf8
-cmp
-internal/itoa
-math/bits
-internal/asan
-internal/msan
-crypto/internal/alias
+internal/runtime/atomic
 crypto/internal/boring/sig
-internal/runtime/exithook
-container/list
+unicode
 unicode/utf16
-internal/bytealg
 vendor/golang.org/x/crypto/cryptobyte/asn1
+container/list
 vendor/golang.org/x/crypto/internal/alias
+runtime/internal/math
 internal/nettrace
+runtime/internal/sys
 encoding
 log/internal
+internal/abi
+internal/chacha8rand
 math
+internal/bytealg
+internal/runtime/exithook
 internal/stringslite
 runtime
+iter
 internal/weak
 crypto/subtle
-iter
 internal/reflectlite
 sync
 maps
 slices
-errors
+internal/singleflight
 internal/bisect
 internal/testlog
+runtime/cgo
+errors
+internal/godebug
 sort
-internal/singleflight
-internal/oserror
 io
-vendor/golang.org/x/net/dns/dnsmessage
+crypto/internal/edwards25519/field
+hash
 path
+internal/oserror
+crypto/internal/randutil
 math/rand/v2
-crypto/internal/edwards25519/field
-internal/godebug
-strconv
-crypto/internal/nistec/fiat
-runtime/cgo
 math/rand
-syscall
-hash
+vendor/golang.org/x/net/dns/dnsmessage
 strings
-crypto/internal/randutil
 bytes
-internal/concurrent
+strconv
+crypto/internal/nistec/fiat
+hash/crc32
+syscall
 crypto/internal/edwards25519
+internal/concurrent
 unique
-hash/crc32
-crypto
+vendor/golang.org/x/text/transform
+crypto/cipher
 bufio
+net/http/internal/ascii
 crypto/rc4
+crypto
+crypto/des
 net/netip
-crypto/cipher
 reflect
-crypto/md5
-vendor/golang.org/x/text/transform
-net/http/internal/ascii
-crypto/des
 crypto/internal/boring
-crypto/hmac
-crypto/sha512
-crypto/sha256
+crypto/md5
 crypto/sha1
+crypto/sha512
+crypto/hmac
 crypto/aes
+crypto/sha256
 vendor/golang.org/x/crypto/hkdf
 internal/syscall/execenv
-time
 internal/syscall/unix
+time
 crypto/internal/nistec
+crypto/ecdh
 context
 io/fs
 internal/poll
+internal/filepathlite
 internal/fmtsort
 encoding/binary
-internal/filepathlite
 os
-crypto/ecdh
-encoding/base64
 vendor/golang.org/x/crypto/internal/poly1305
+encoding/base64
 vendor/golang.org/x/crypto/chacha20
-vendor/golang.org/x/crypto/chacha20poly1305
 encoding/pem
-path/filepath
+vendor/golang.org/x/crypto/chacha20poly1305
+vendor/golang.org/x/sys/cpu
 io/ioutil
+path/filepath
 fmt
-vendor/golang.org/x/sys/cpu
-net
 vendor/golang.org/x/crypto/sha3
-encoding/hex
 log
+net/http/internal
 net/url
 mime
 compress/flate
-vendor/golang.org/x/text/unicode/norm
-encoding/json
 vendor/golang.org/x/net/http2/hpack
 mime/quotedprintable
+encoding/hex
+encoding/json
 math/big
-net/http/internal
+vendor/golang.org/x/text/unicode/norm
+net
 vendor/golang.org/x/text/unicode/bidi
 compress/gzip
 vendor/golang.org/x/text/secure/bidirule
 vendor/golang.org/x/net/idna
 crypto/internal/boring/bbig
-crypto/elliptic
 crypto/rand
-crypto/internal/bigmod
+crypto/elliptic
 crypto/dsa
+crypto/internal/bigmod
 encoding/asn1
+crypto/internal/hpke
 crypto/ed25519
 crypto/internal/mlkem768
-crypto/internal/hpke
-crypto/rsa
 crypto/x509/pkix
 vendor/golang.org/x/crypto/cryptobyte
+crypto/rsa
 crypto/ecdsa
 vendor/golang.org/x/net/http/httpproxy
 net/textproto
@@ -498,7 +534,7 @@
 net/http
 github.com/gorilla/websocket
    dh_auto_test -O--builddirectory=_build -O--buildsystem=golang
-	cd _build && go test -vet=off -v -p 11 github.com/gorilla/websocket
+	cd _build && go test -vet=off -v -p 21 github.com/gorilla/websocket
 === RUN   TestProxyDial
 --- PASS: TestProxyDial (0.00s)
 === RUN   TestProxyAuthorizationDial
@@ -508,10 +544,11 @@
 === RUN   TestDialCookieJar
 --- PASS: TestDialCookieJar (0.00s)
 === RUN   TestDialTLS
---- PASS: TestDialTLS (0.03s)
+--- PASS: TestDialTLS (0.02s)
 === RUN   TestDialTimeout
 --- PASS: TestDialTimeout (0.00s)
 === RUN   TestHandshakeTimeout
+    client_server_test.go:109: NextReader: websocket: close 1006 (abnormal closure): unexpected EOF
 --- PASS: TestHandshakeTimeout (0.00s)
 === RUN   TestHandshakeTimeoutInContext
     client_server_test.go:109: NextReader: websocket: close 1006 (abnormal closure): unexpected EOF
@@ -527,7 +564,7 @@
     client_server_test.go:97: Upgrade: websocket: request origin not allowed by Upgrader.CheckOrigin
     client_server_test.go:97: Upgrade: websocket: request origin not allowed by Upgrader.CheckOrigin
     client_server_test.go:97: Upgrade: websocket: request origin not allowed by Upgrader.CheckOrigin
---- PASS: TestDialBadHeader (0.01s)
+--- PASS: TestDialBadHeader (0.00s)
 === RUN   TestBadMethod
 --- PASS: TestBadMethod (0.00s)
 === RUN   TestDialExtraTokensInRespHeaders
@@ -537,22 +574,22 @@
 === RUN   TestRespOnBadHandshake
 --- PASS: TestRespOnBadHandshake (0.00s)
 === RUN   TestHost
-    client_server_test.go:567: http: TLS handshake error from 127.0.0.1:41806: remote error: tls: bad certificate
-    client_server_test.go:567: http: TLS handshake error from 127.0.0.1:41818: remote error: tls: bad certificate
---- PASS: TestHost (0.31s)
+    client_server_test.go:567: http: TLS handshake error from 127.0.0.1:51322: remote error: tls: bad certificate
+    client_server_test.go:567: http: TLS handshake error from 127.0.0.1:51326: remote error: tls: bad certificate
+--- PASS: TestHost (0.18s)
 === RUN   TestDialCompression
 --- PASS: TestDialCompression (0.00s)
 === RUN   TestSocksProxyDial
 --- PASS: TestSocksProxyDial (0.00s)
 === RUN   TestTracingDialWithContext
---- PASS: TestTracingDialWithContext (0.03s)
+--- PASS: TestTracingDialWithContext (0.02s)
 === RUN   TestEmptyTracingDialWithContext
---- PASS: TestEmptyTracingDialWithContext (0.03s)
+--- PASS: TestEmptyTracingDialWithContext (0.01s)
 === RUN   TestNetDialConnect
---- PASS: TestNetDialConnect (0.14s)
+--- PASS: TestNetDialConnect (0.07s)
 === RUN   TestNextProtos
-2024/12/15 17:06:45 http2: server: error reading preface from client 127.0.0.1:46300: bogus greeting "GET / HTTP/1.1\r\nHost: 12"
---- PASS: TestNextProtos (0.06s)
+2026/01/17 23:30:51 http2: server: error reading preface from client 127.0.0.1:32878: bogus greeting "GET / HTTP/1.1\r\nHost: 12"
+--- PASS: TestNextProtos (0.03s)
 === RUN   TestHostPortNoPort
 --- PASS: TestHostPortNoPort (0.00s)
 === RUN   TestTruncWriter
@@ -956,7 +993,7 @@
     conn_test.go:127: frame size: 65535
     conn_test.go:127: frame size: 65535
     conn_test.go:127: frame size: 65535
---- PASS: TestFraming (0.17s)
+--- PASS: TestFraming (0.09s)
 === RUN   TestControl
 --- PASS: TestControl (0.00s)
 === RUN   TestWriteBufferPool
@@ -1004,9 +1041,9 @@
 === RUN   TestDeprecatedJSON
 --- PASS: TestDeprecatedJSON (0.00s)
 === RUN   TestMaskBytes
---- PASS: TestMaskBytes (0.06s)
+--- PASS: TestMaskBytes (0.03s)
 === RUN   TestPreparedMessage
---- PASS: TestPreparedMessage (0.01s)
+--- PASS: TestPreparedMessage (0.00s)
 === RUN   TestSubprotocols
 --- PASS: TestSubprotocols (0.00s)
 === RUN   TestIsWebSocketUpgrade
@@ -1026,7 +1063,7 @@
 === RUN   TestX
 --- PASS: TestX (0.00s)
 PASS
-ok  	github.com/gorilla/websocket	0.876s
+ok  	github.com/gorilla/websocket	0.458s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--builddirectory=_build -O--buildsystem=golang
    dh_prep -O--builddirectory=_build -O--buildsystem=golang
@@ -1054,12 +1091,14 @@
 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/23424/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/23424/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/10397 and its subdirectories
-I: Current time: Sun Dec 15 05:06:57 -12 2024
-I: pbuilder-time-stamp: 1734282417
+I: removing directory /srv/workspace/pbuilder/23424 and its subdirectories
+I: Current time: Sun Jan 18 13:30:55 +14 2026
+I: pbuilder-time-stamp: 1768692655