Diff of the two buildlogs:

--
--- b1/build.log	2025-01-14 08:05:52.597209487 +0000
+++ b2/build.log	2025-01-14 08:07:27.516872122 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Feb 16 02:27:47 -12 2026
-I: pbuilder-time-stamp: 1771252067
+I: Current time: Tue Jan 14 22:05:56 +14 2025
+I: pbuilder-time-stamp: 1736841956
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -24,52 +24,84 @@
 dpkg-source: info: applying use-upstream-go-logger.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1996453/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/700781/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink04-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 Jan 14 08:06 /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/700781/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/700781/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='26f03623abe54b38ac42202ca0a7db17'
-  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='1996453'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=b3c626211e9340629d1feb11f25c6b19
+  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=700781
   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.KIhKLSFb/pbuilderrc_ztFd --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.KIhKLSFb/b1 --logfile b1/build.log unikmer_0.20.0-1.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.KIhKLSFb/pbuilderrc_438t --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.KIhKLSFb/b2 --logfile b2/build.log unikmer_0.20.0-1.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 codethink03-arm64 6.1.0-29-cloud-arm64 #1 SMP Debian 6.1.123-1 (2025-01-02) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-29-cloud-arm64 #1 SMP Debian 6.1.123-1 (2025-01-02) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1996453/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/700781/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -253,7 +285,7 @@
 Get: 104 http://deb.debian.org/debian trixie/main arm64 golang-github-tatsushid-go-prettytable-dev all 0.0~git20141013.ed2d14c-3 [5492 B]
 Get: 105 http://deb.debian.org/debian trixie/main arm64 golang-github-will-rowe-nthash-dev all 0.4.0-1 [5644 B]
 Get: 106 http://deb.debian.org/debian trixie/main arm64 golang-github-zeebo-wyhash-dev all 0.0.1-3 [23.5 kB]
-Fetched 108 MB in 1s (166 MB/s)
+Fetched 108 MB in 1s (193 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package tzdata.
 (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 ... 19968 files and directories currently installed.)
@@ -608,8 +640,8 @@
 Setting up tzdata (2024b-4) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Mon Feb 16 14:28:08 UTC 2026.
-Universal Time is now:  Mon Feb 16 14:28:08 UTC 2026.
+Local time is now:      Tue Jan 14 08:06:35 UTC 2025.
+Universal Time is now:  Tue Jan 14 08:06:35 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up golang-github-cespare-xxhash-dev (2.3.0-1) ...
@@ -698,7 +730,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/unikmer-0.20.0/ && 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  > ../unikmer_0.20.0-1_source.changes
+I: user script /srv/workspace/pbuilder/700781/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/700781/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/unikmer-0.20.0/ && 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  > ../unikmer_0.20.0-1_source.changes
 dpkg-buildpackage: info: source package unikmer
 dpkg-buildpackage: info: source version 0.20.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -717,121 +753,121 @@
    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 12 github.com/shenwei356/unikmer/unikmer github.com/shenwei356/unikmer/unikmer/cmd
-internal/coverage/rtcov
-internal/race
 internal/goarch
-internal/goos
-internal/byteorder
-internal/goexperiment
-internal/profilerecord
-internal/unsafeheader
 internal/godebugs
+internal/unsafeheader
 sync/atomic
+internal/cpu
+internal/race
+internal/goexperiment
+internal/byteorder
+internal/runtime/syscall
+internal/coverage/rtcov
+internal/profilerecord
+internal/goos
 internal/abi
 runtime/internal/math
-internal/cpu
 unicode
-internal/runtime/syscall
-runtime/internal/sys
 unicode/utf8
 math/bits
 internal/itoa
 cmp
+runtime/internal/sys
+internal/chacha8rand
 internal/asan
 internal/msan
 log/internal
-internal/chacha8rand
 internal/nettrace
-github.com/dsnet/compress/bzip2/internal/sais
 github.com/elliotwutingfeng/asciiset
-github.com/dsnet/compress/internal
+github.com/dsnet/compress/bzip2/internal/sais
+math
 crypto/internal/alias
+github.com/dsnet/compress/internal
 crypto/subtle
 crypto/internal/boring/sig
 github.com/ulikunitz/xz/internal/hash
 container/list
 unicode/utf16
 vendor/golang.org/x/crypto/cryptobyte/asn1
-math
-internal/bytealg
-internal/runtime/atomic
 vendor/golang.org/x/crypto/internal/alias
-github.com/rivo/uniseg
 encoding
+github.com/rivo/uniseg
+internal/bytealg
+internal/runtime/atomic
 internal/runtime/exithook
 internal/stringslite
 runtime
 github.com/klauspost/compress
 internal/reflectlite
+sync
 iter
 internal/weak
-sync
 slices
 maps
 internal/bisect
-internal/singleflight
 internal/testlog
+internal/singleflight
 runtime/cgo
 errors
 sort
-io
 internal/godebug
-internal/oserror
+io
 strconv
-syscall
+internal/oserror
+path
 vendor/golang.org/x/net/dns/dnsmessage
 crypto/internal/edwards25519/field
 math/rand/v2
 crypto/internal/nistec/fiat
-path
-container/heap
 math/rand
-bytes
+reflect
+internal/concurrent
 strings
+syscall
+bytes
+unique
 hash
+crypto/internal/edwards25519
 crypto/internal/randutil
-internal/concurrent
+container/heap
+crypto/rc4
 hash/crc32
-unique
-hash/crc64
-crypto/internal/edwards25519
-reflect
 crypto
-crypto/rc4
 crypto/cipher
-crypto/md5
-vendor/golang.org/x/text/transform
-github.com/twotwotwo/sorts
-net/netip
-github.com/shenwei356/kmers
 regexp/syntax
 bufio
 github.com/dsnet/compress/internal/errors
+hash/crc64
+crypto/md5
+vendor/golang.org/x/text/transform
+net/netip
 net/http/internal/ascii
 crypto/internal/boring
+github.com/twotwotwo/sorts
+github.com/shenwei356/kmers
 crypto/des
-github.com/twotwotwo/sorts/sortutil
 crypto/sha256
 crypto/aes
-crypto/sha512
 github.com/dsnet/compress
+crypto/sha512
 crypto/hmac
 crypto/sha1
 vendor/golang.org/x/crypto/hkdf
+github.com/twotwotwo/sorts/sortutil
 regexp
+time
 internal/syscall/execenv
 internal/syscall/unix
-time
 github.com/shenwei356/natsort
 io/fs
 internal/poll
 context
 internal/filepathlite
 embed
+os
 encoding/binary
 internal/fmtsort
 crypto/internal/nistec
-os
 golang.org/x/sys/unix
 github.com/cespare/xxhash
 github.com/klauspost/compress/internal/snapref
@@ -840,87 +876,87 @@
 encoding/base64
 github.com/zeebo/wyhash
 encoding/pem
-vendor/golang.org/x/crypto/chacha20poly1305
 crypto/ecdh
+vendor/golang.org/x/crypto/chacha20poly1305
 fmt
-net
-path/filepath
 vendor/golang.org/x/sys/cpu
+path/filepath
 github.com/mattn/go-runewidth
-os/exec
+net
 vendor/golang.org/x/crypto/sha3
+os/exec
 github.com/mitchellh/go-homedir
 log
-compress/flate
 math/big
+encoding/hex
+compress/flate
+runtime/debug
+github.com/klauspost/compress/fse
 github.com/pkg/errors
 github.com/shenwei356/util/byteutil
 github.com/dsnet/compress/internal/prefix
-github.com/klauspost/compress/fse
-encoding/hex
-runtime/debug
 github.com/ulikunitz/xz/internal/xlog
 net/url
 vendor/golang.org/x/text/unicode/norm
 github.com/shenwei356/bio/seq
-github.com/ulikunitz/xz/lzma
 vendor/golang.org/x/text/unicode/bidi
-vendor/golang.org/x/net/http2/hpack
-github.com/klauspost/compress/huff0
+github.com/ulikunitz/xz/lzma
 github.com/dsnet/compress/bzip2
 github.com/klauspost/compress/flate
 compress/gzip
+github.com/klauspost/compress/huff0
+vendor/golang.org/x/text/secure/bidirule
+vendor/golang.org/x/net/http2/hpack
 mime
 mime/quotedprintable
 net/http/internal
 os/user
 github.com/will-rowe/nthash
 github.com/shenwei356/unik/v5
-vendor/golang.org/x/text/secure/bidirule
 github.com/shenwei356/bio/sketches
 github.com/shenwei356/util/pathutil
 github.com/shenwei356/util/stringutil
+vendor/golang.org/x/net/idna
 encoding/csv
 flag
 text/template/parse
-github.com/mattn/go-isatty
 github.com/ulikunitz/xz
-vendor/golang.org/x/net/idna
-github.com/mattn/go-colorable
+github.com/mattn/go-isatty
 github.com/dustin/go-humanize
 crypto/rand
 crypto/elliptic
 crypto/internal/bigmod
 crypto/internal/boring/bbig
-github.com/klauspost/compress/zstd
 encoding/asn1
-crypto/ed25519
+github.com/mattn/go-colorable
+crypto/dsa
+github.com/klauspost/compress/zstd
 crypto/internal/hpke
+crypto/ed25519
 crypto/internal/mlkem768
-crypto/dsa
 github.com/shenwei356/stable
+github.com/klauspost/pgzip
 crypto/rsa
 text/template
 vendor/golang.org/x/crypto/cryptobyte
 crypto/x509/pkix
-github.com/klauspost/pgzip
 crypto/ecdsa
 log/syslog
-crypto/x509
 net/textproto
+crypto/x509
 vendor/golang.org/x/net/http/httpproxy
 github.com/spf13/pflag
 github.com/op/go-logging
 vendor/golang.org/x/net/http/httpguts
 mime/multipart
-github.com/spf13/cobra
 crypto/tls
+github.com/spf13/cobra
 net/http/httptrace
 net/http
 github.com/shenwei356/xopen
 github.com/shenwei356/bio/seqio/fastx
-github.com/shenwei356/bio/taxdump
 github.com/shenwei356/breader
+github.com/shenwei356/bio/taxdump
 github.com/shenwei356/unikmer/unikmer/cmd
 github.com/shenwei356/unikmer/unikmer
    dh_auto_test -O--builddirectory=_build -O--buildsystem=golang
@@ -965,12 +1001,14 @@
 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/700781/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/700781/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/1996453 and its subdirectories
-I: Current time: Mon Feb 16 02:28:50 -12 2026
-I: pbuilder-time-stamp: 1771252130
+I: removing directory /srv/workspace/pbuilder/700781 and its subdirectories
+I: Current time: Tue Jan 14 22:07:26 +14 2025
+I: pbuilder-time-stamp: 1736842046