Diff of the two buildlogs:

--
--- b1/build.log	2024-12-25 11:29:51.936971535 +0000
+++ b2/build.log	2024-12-25 11:34:22.232655117 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue Jan 27 05:52:04 -12 2026
-I: pbuilder-time-stamp: 1769536324
+I: Current time: Thu Dec 26 01:29:55 +14 2024
+I: pbuilder-time-stamp: 1735126195
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -26,52 +26,84 @@
 dpkg-source: info: unpacking golang-github-nats-io-go-nats_1.38.0-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2073778/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/808146/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos11-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 Dec 25 11:30 /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/808146/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/808146/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=42 '
-  DISTRIBUTION='trixie'
-  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]="37" [3]="1" [4]="release" [5]="x86_64-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=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=20 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='4d91d623843a478b9ac1a656bf527e56'
-  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='2073778'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=d564d303cfb24100a5db49468fd02655
+  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=808146
   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.ktBDj8d8/pbuilderrc_vhyP --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.ktBDj8d8/b1 --logfile b1/build.log golang-github-nats-io-go-nats_1.38.0-1.dsc'
-  SUDO_GID='111'
-  SUDO_UID='106'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://213.165.73.152:3128'
+  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.ktBDj8d8/pbuilderrc_FerQ --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.ktBDj8d8/b2 --logfile b2/build.log golang-github-nats-io-go-nats_1.38.0-1.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://46.16.76.132:3128
 I: uname -a
-  Linux ionos15-amd64 6.11.10+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.11.10-1~bpo12+1 (2024-12-19) 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  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/2073778/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/808146/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -169,7 +201,7 @@
 Get: 44 http://deb.debian.org/debian trixie/main amd64 golang-golang-x-crypto-dev all 1:0.25.0-1 [1682 kB]
 Get: 45 http://deb.debian.org/debian trixie/main amd64 golang-github-nats-io-nkeys-dev all 0.4.8-1 [16.7 kB]
 Get: 46 http://deb.debian.org/debian trixie/main amd64 golang-github-nats-io-nuid-dev all 1.0.1-1 [4452 B]
-Fetched 106 MB in 2s (59.5 MB/s)
+Fetched 106 MB in 5s (20.0 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 ... 19966 files and directories currently installed.)
@@ -368,7 +400,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-nats-io-go-nats-1.38.0/ && 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-nats-io-go-nats_1.38.0-1_source.changes
+I: user script /srv/workspace/pbuilder/808146/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/808146/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-nats-io-go-nats-1.38.0/ && 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-nats-io-go-nats_1.38.0-1_source.changes
 dpkg-buildpackage: info: source package golang-github-nats-io-go-nats
 dpkg-buildpackage: info: source version 1.38.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -389,190 +425,190 @@
 dh_auto_build: warning: github.com/nats-io/nats.go/jetstream/test contains no non-test Go files, removing it from build
 dh_auto_build: warning: github.com/nats-io/nats.go/micro/test contains no non-test Go files, removing it from build
 dh_auto_build: warning: github.com/nats-io/nats.go/test contains no non-test Go files, removing it from build
-	cd obj-x86_64-linux-gnu && go install -trimpath -v -p 42 github.com/nats-io/nats.go github.com/nats-io/nats.go/bench github.com/nats-io/nats.go/encoders/builtin github.com/nats-io/nats.go/encoders/protobuf github.com/nats-io/nats.go/internal/parser github.com/nats-io/nats.go/internal/syncx github.com/nats-io/nats.go/jetstream github.com/nats-io/nats.go/micro github.com/nats-io/nats.go/util
-internal/goos
-internal/byteorder
-golang.org/x/crypto/internal/alias
-crypto/internal/alias
-internal/coverage/rtcov
-internal/nettrace
-unicode/utf16
+	cd obj-x86_64-linux-gnu && go install -trimpath -v -p 20 github.com/nats-io/nats.go github.com/nats-io/nats.go/bench github.com/nats-io/nats.go/encoders/builtin github.com/nats-io/nats.go/encoders/protobuf github.com/nats-io/nats.go/internal/parser github.com/nats-io/nats.go/internal/syncx github.com/nats-io/nats.go/jetstream github.com/nats-io/nats.go/micro github.com/nats-io/nats.go/util
 internal/unsafeheader
-google.golang.org/protobuf/internal/flags
+math/bits
 internal/goarch
+unicode/utf8
 unicode
-container/list
-log/internal
+crypto/internal/alias
+internal/race
+internal/itoa
+internal/byteorder
+internal/coverage/rtcov
 internal/msan
-vendor/golang.org/x/crypto/internal/alias
-encoding
-crypto/subtle
+sync/atomic
+internal/runtime/atomic
+internal/profilerecord
 internal/godebugs
-vendor/golang.org/x/crypto/cryptobyte/asn1
 internal/asan
-cmp
-unicode/utf8
-internal/itoa
-internal/goexperiment
-crypto/internal/boring/sig
-internal/cpu
-math/bits
-internal/profilerecord
-internal/runtime/atomic
-internal/race
 internal/runtime/syscall
-sync/atomic
 runtime/internal/math
-runtime/internal/sys
+crypto/subtle
+internal/goexperiment
 internal/abi
-internal/chacha8rand
+internal/goos
+internal/cpu
+crypto/internal/boring/sig
+cmp
+container/list
+unicode/utf16
+vendor/golang.org/x/crypto/cryptobyte/asn1
+runtime/internal/sys
+vendor/golang.org/x/crypto/internal/alias
+internal/nettrace
+encoding
+golang.org/x/crypto/internal/alias
+log/internal
 golang.org/x/crypto/salsa20/salsa
+google.golang.org/protobuf/internal/flags
+internal/chacha8rand
 internal/bytealg
 math
 internal/runtime/exithook
 internal/stringslite
 runtime
-internal/weak
 internal/reflectlite
-iter
 sync
-maps
+iter
+internal/weak
 slices
+maps
 internal/bisect
+internal/singleflight
+internal/testlog
 google.golang.org/protobuf/internal/pragma
 github.com/nats-io/nats.go/internal/syncx
-internal/testlog
-internal/singleflight
 runtime/cgo
 errors
 internal/godebug
-internal/oserror
-io
 sort
-crypto/internal/edwards25519/field
+io
+internal/oserror
 path
+strconv
+math/rand
 vendor/golang.org/x/net/dns/dnsmessage
+crypto/internal/edwards25519/field
 math/rand/v2
-math/rand
-strconv
 crypto/internal/nistec/fiat
 syscall
+bytes
 hash
-internal/saferio
 crypto/internal/randutil
-bytes
+internal/saferio
 strings
+golang.org/x/text/internal/tag
 internal/concurrent
-hash/fnv
 hash/crc32
+hash/fnv
 crypto/internal/edwards25519
 unique
-golang.org/x/text/internal/tag
-crypto/cipher
-golang.org/x/text/transform
-vendor/golang.org/x/text/transform
 crypto
+reflect
+crypto/rc4
 encoding/base32
-net/http/internal/ascii
+crypto/md5
 net/netip
+vendor/golang.org/x/text/transform
+golang.org/x/text/transform
+crypto/cipher
 bufio
-crypto/rc4
+net/http/internal/ascii
 regexp/syntax
-reflect
-crypto/md5
 crypto/internal/boring
 crypto/des
 crypto/sha1
 crypto/sha256
 crypto/aes
-crypto/hmac
 crypto/sha512
+crypto/hmac
 vendor/golang.org/x/crypto/hkdf
+time
 internal/syscall/execenv
 internal/syscall/unix
-time
 regexp
-context
 io/fs
 internal/poll
-embed
+context
+internal/fmtsort
+encoding/binary
 internal/filepathlite
+embed
 crypto/internal/nistec
 os
-internal/fmtsort
-encoding/binary
 vendor/golang.org/x/crypto/chacha20
-vendor/golang.org/x/crypto/internal/poly1305
 encoding/base64
+vendor/golang.org/x/crypto/internal/poly1305
 golang.org/x/crypto/internal/poly1305
-crypto/ecdh
 encoding/pem
 golang.org/x/crypto/nacl/secretbox
+crypto/ecdh
 golang.org/x/crypto/curve25519
-google.golang.org/protobuf/internal/detrand
+fmt
 vendor/golang.org/x/sys/cpu
 path/filepath
-fmt
 golang.org/x/sys/cpu
+google.golang.org/protobuf/internal/detrand
 net
-vendor/golang.org/x/crypto/sha3
 vendor/golang.org/x/crypto/chacha20poly1305
+vendor/golang.org/x/crypto/sha3
 golang.org/x/crypto/blake2b
-net/url
+encoding/hex
 github.com/nats-io/nats.go/internal/parser
 log
-mime/quotedprintable
+net/url
 google.golang.org/protobuf/internal/errors
-vendor/golang.org/x/net/http2/hpack
-net/http/internal
-encoding/csv
 compress/flate
-go/token
-encoding/hex
-mime
-encoding/json
 encoding/gob
+vendor/golang.org/x/net/http2/hpack
+mime
+math/big
+go/token
 golang.org/x/text/internal/language
+encoding/json
+mime/quotedprintable
+encoding/csv
+net/http/internal
 vendor/golang.org/x/text/unicode/norm
-math/big
 golang.org/x/text/unicode/norm
 google.golang.org/protobuf/encoding/protowire
 google.golang.org/protobuf/reflect/protoreflect
 vendor/golang.org/x/text/unicode/bidi
 compress/gzip
 github.com/klauspost/compress/flate
+vendor/golang.org/x/text/secure/bidirule
+golang.org/x/text/internal/language/compact
+golang.org/x/text/language
 google.golang.org/protobuf/internal/encoding/messageset
 google.golang.org/protobuf/internal/order
-google.golang.org/protobuf/runtime/protoiface
 google.golang.org/protobuf/internal/strs
+google.golang.org/protobuf/runtime/protoiface
 google.golang.org/protobuf/internal/genid
-vendor/golang.org/x/text/secure/bidirule
-golang.org/x/text/internal/language/compact
 google.golang.org/protobuf/reflect/protoregistry
-vendor/golang.org/x/net/idna
-golang.org/x/text/language
-google.golang.org/protobuf/proto
 crypto/rand
-crypto/internal/boring/bbig
-crypto/dsa
 crypto/elliptic
 crypto/internal/bigmod
+crypto/internal/boring/bbig
 encoding/asn1
-github.com/nats-io/nats.go/encoders/builtin
-golang.org/x/text/internal
-golang.org/x/text/cases
-crypto/internal/mlkem768
-golang.org/x/crypto/nacl/box
+crypto/dsa
+vendor/golang.org/x/net/idna
 crypto/ed25519
 crypto/internal/hpke
+crypto/internal/mlkem768
+golang.org/x/crypto/nacl/box
 github.com/nats-io/nuid
-crypto/rsa
+google.golang.org/protobuf/proto
+golang.org/x/text/internal
 github.com/nats-io/nkeys
-crypto/x509/pkix
+golang.org/x/text/cases
+github.com/nats-io/nats.go/encoders/builtin
+crypto/rsa
 vendor/golang.org/x/crypto/cryptobyte
+crypto/x509/pkix
 crypto/ecdsa
-vendor/golang.org/x/net/http/httpproxy
 net/textproto
+vendor/golang.org/x/net/http/httpproxy
 crypto/x509
 vendor/golang.org/x/net/http/httpguts
 mime/multipart
@@ -612,12 +648,14 @@
 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/808146/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/808146/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/2073778 and its subdirectories
-I: Current time: Tue Jan 27 05:52:48 -12 2026
-I: pbuilder-time-stamp: 1769536368
+I: removing directory /srv/workspace/pbuilder/808146 and its subdirectories
+I: Current time: Thu Dec 26 01:34:21 +14 2024
+I: pbuilder-time-stamp: 1735126461