Diff of the two buildlogs:

--
--- b1/build.log	2024-01-13 02:05:46.309507929 +0000
+++ b2/build.log	2024-01-13 02:17:07.841052217 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri Jan 12 14:03:15 -12 2024
-I: pbuilder-time-stamp: 1705111395
+I: Current time: Sat Jan 13 16:05:58 +14 2024
+I: pbuilder-time-stamp: 1705111558
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bookworm-reproducible-base.tgz]
 I: copying local configuration
@@ -25,49 +25,81 @@
 dpkg-source: info: unpacking golang-github-xiang90-probing_0.0.2-2.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/20709/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3506/tmp/hooks/D01_modify_environment starting
+debug: Running on cbxi4a.
+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 13 02:07 /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/3506/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3506/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='bookworm'
-  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]="15" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
+  BASH_VERSION='5.2.15(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=bookworm
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='1cdacf02b25641ffa411cdb8cc6e4329'
-  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='20709'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=b553e797a83047db8a04739265750a69
+  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=3506
   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.IQj01XkR/pbuilderrc_5xo7 --distribution bookworm --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.IQj01XkR/b1 --logfile b1/build.log golang-github-xiang90-probing_0.0.2-2.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.IQj01XkR/pbuilderrc_xmJ4 --distribution bookworm --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bookworm-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.IQj01XkR/b2 --logfile b2/build.log golang-github-xiang90-probing_0.0.2-2.dsc'
+  SUDO_GID=113
+  SUDO_UID=107
+  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 virt64c 6.1.0-17-arm64 #1 SMP Debian 6.1.69-1 (2023-12-30) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-17-armmp #1 SMP Debian 6.1.69-1 (2023-12-30) armv7l GNU/Linux
 I: ls -l /bin
   total 4964
   -rwxr-xr-x 1 root root 838488 Apr 23  2023 bash
@@ -127,7 +159,7 @@
   -rwxr-xr-x 1 root root  67600 Sep 20  2022 rmdir
   -rwxr-xr-x 1 root root  14152 Jul 28 23:46 run-parts
   -rwxr-xr-x 1 root root 133372 Jan  5  2023 sed
-  lrwxrwxrwx 1 root root      4 Jan  5  2023 sh -> dash
+  lrwxrwxrwx 1 root root      9 Jan 13 02:07 sh -> /bin/bash
   -rwxr-xr-x 1 root root  67584 Sep 20  2022 sleep
   -rwxr-xr-x 1 root root  67644 Sep 20  2022 stty
   -rwsr-xr-x 1 root root  50800 Mar 23  2023 su
@@ -153,7 +185,7 @@
   -rwxr-xr-x 1 root root   2206 Apr 10  2022 zless
   -rwxr-xr-x 1 root root   1842 Apr 10  2022 zmore
   -rwxr-xr-x 1 root root   4577 Apr 10  2022 znew
-I: user script /srv/workspace/pbuilder/20709/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/3506/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -229,7 +261,7 @@
 Get: 34 http://deb.debian.org/debian bookworm/main armhf golang-src all 2:1.19~1 [5756 B]
 Get: 35 http://deb.debian.org/debian bookworm/main armhf golang-go armhf 2:1.19~1 [45.0 kB]
 Get: 36 http://deb.debian.org/debian bookworm/main armhf golang-any armhf 2:1.19~1 [5876 B]
-Fetched 93.3 MB in 2s (39.8 MB/s)
+Fetched 93.3 MB in 15s (6167 kB/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 ... 17881 files and directories currently installed.)
@@ -393,7 +425,11 @@
 fakeroot is already the newest version (1.31-1.2).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-xiang90-probing-0.0.2/ && 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-xiang90-probing_0.0.2-2_source.changes
+I: user script /srv/workspace/pbuilder/3506/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for bookworm
+I: user script /srv/workspace/pbuilder/3506/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-xiang90-probing-0.0.2/ && 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-xiang90-probing_0.0.2-2_source.changes
 dpkg-buildpackage: info: source package golang-github-xiang90-probing
 dpkg-buildpackage: info: source version 0.0.2-2
 dpkg-buildpackage: info: source distribution unstable
@@ -411,31 +447,31 @@
    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/xiang90/probing
+	cd obj-arm-linux-gnueabihf && go install -trimpath -v -p 4 github.com/xiang90/probing
 internal/goarch
 internal/unsafeheader
+internal/goexperiment
 internal/cpu
 internal/abi
-internal/goexperiment
 internal/goos
 runtime/internal/math
 runtime/internal/sys
 runtime/internal/syscall
 internal/race
-internal/bytealg
-runtime/internal/atomic
 sync/atomic
 unicode
 unicode/utf8
-runtime
+internal/bytealg
+runtime/internal/atomic
 encoding
 math/bits
-math
 internal/itoa
 unicode/utf16
 container/list
+math
 crypto/internal/subtle
 crypto/subtle
+runtime
 crypto/internal/boring/sig
 vendor/golang.org/x/crypto/cryptobyte/asn1
 internal/nettrace
@@ -443,87 +479,87 @@
 internal/reflectlite
 sync
 internal/testlog
-math/rand
 internal/singleflight
+math/rand
 runtime/cgo
 errors
-sort
 io
+sort
 strconv
-bytes
 internal/oserror
 syscall
-reflect
+bytes
 internal/safefilepath
+reflect
 path
+strings
+bufio
 internal/syscall/unix
 time
 internal/syscall/execenv
-strings
-bufio
 hash
 hash/crc32
-encoding/binary
-internal/fmtsort
+crypto
+crypto/internal/randutil
+crypto/internal/nistec/fiat
+crypto/rc4
+vendor/golang.org/x/net/dns/dnsmessage
 internal/poll
 io/fs
-encoding/base64
+encoding/binary
+internal/fmtsort
 context
-crypto
-crypto/cipher
-crypto/internal/randutil
 os
-crypto/internal/nistec/fiat
+vendor/golang.org/x/text/transform
+encoding/base64
+crypto/cipher
+crypto/internal/edwards25519/field
+crypto/internal/edwards25519
 crypto/internal/boring
 crypto/aes
-crypto/des
 fmt
+crypto/des
 crypto/sha512
-crypto/internal/edwards25519/field
-crypto/internal/edwards25519
-encoding/json
-compress/flate
-math/big
-compress/gzip
-crypto/internal/nistec
 crypto/hmac
 crypto/md5
-crypto/rc4
 crypto/sha1
+crypto/internal/nistec
 crypto/sha256
-encoding/hex
 encoding/pem
 internal/godebug
-vendor/golang.org/x/net/dns/dnsmessage
 internal/intern
+path/filepath
 net/netip
-crypto/rand
-crypto/elliptic
-crypto/internal/boring/bbig
-encoding/asn1
-crypto/ed25519
-crypto/rsa
-crypto/dsa
+encoding/json
+compress/flate
+math/big
+encoding/hex
 net
+compress/gzip
 net/url
-vendor/golang.org/x/crypto/cryptobyte
-crypto/x509/pkix
-path/filepath
-crypto/ecdsa
 vendor/golang.org/x/crypto/chacha20
 vendor/golang.org/x/crypto/internal/poly1305
 vendor/golang.org/x/crypto/curve25519/internal/field
 vendor/golang.org/x/crypto/chacha20poly1305
 vendor/golang.org/x/crypto/hkdf
-vendor/golang.org/x/crypto/curve25519
-vendor/golang.org/x/text/transform
 log
+vendor/golang.org/x/crypto/curve25519
 vendor/golang.org/x/text/unicode/norm
 vendor/golang.org/x/text/unicode/bidi
+crypto/rand
+crypto/elliptic
+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
+crypto/ecdsa
 mime
-vendor/golang.org/x/net/idna
 mime/quotedprintable
 net/http/internal
 net/http/internal/ascii
@@ -537,51 +573,33 @@
 net/http
 github.com/xiang90/probing
    dh_auto_test -O--buildsystem=golang
-	cd obj-arm-linux-gnueabihf && go test -vet=off -v -p 3 github.com/xiang90/probing
+	cd obj-arm-linux-gnueabihf && go test -vet=off -v -p 4 github.com/xiang90/probing
 === RUN   TestProbe
---- PASS: TestProbe (0.20s)
+    prober_test.go:26: total = 26, want around 100
+--- FAIL: TestProbe (0.11s)
 === RUN   TestProbeReset
---- PASS: TestProbeReset (0.20s)
+    prober_test.go:61: total = 29, want around 100
+--- FAIL: TestProbeReset (0.11s)
 === RUN   TestProbeRemove
 --- PASS: TestProbeRemove (0.00s)
-PASS
-ok  	github.com/xiang90/probing	0.414s
-   create-stamp debian/debhelper-build-stamp
- fakeroot debian/rules binary
-dh binary --buildsystem=golang --with=golang
-   dh_testroot -O--buildsystem=golang
-   dh_prep -O--buildsystem=golang
-   dh_auto_install --destdir=debian/golang-github-xiang90-probing-dev/ -O--buildsystem=golang
-   dh_installdocs -O--buildsystem=golang
-   dh_installchangelogs -O--buildsystem=golang
-   dh_installinit -O--buildsystem=golang
-   dh_installsystemduser -O--buildsystem=golang
-   dh_perl -O--buildsystem=golang
-   dh_link -O--buildsystem=golang
-   dh_strip_nondeterminism -O--buildsystem=golang
-   dh_compress -O--buildsystem=golang
-   dh_fixperms -O--buildsystem=golang
-   dh_missing -O--buildsystem=golang
-   dh_installdeb -O--buildsystem=golang
-   dh_golang -O--buildsystem=golang
-   dh_gencontrol -O--buildsystem=golang
-dpkg-gencontrol: warning: Depends field of package golang-github-xiang90-probing-dev: substitution variable ${shlibs:Depends} used, but is not defined
-   dh_md5sums -O--buildsystem=golang
-   dh_builddeb -O--buildsystem=golang
-dpkg-deb: building package 'golang-github-xiang90-probing-dev' in '../golang-github-xiang90-probing-dev_0.0.2-2_all.deb'.
- dpkg-genbuildinfo --build=binary -O../golang-github-xiang90-probing_0.0.2-2_armhf.buildinfo
- dpkg-genchanges --build=binary -O../golang-github-xiang90-probing_0.0.2-2_armhf.changes
-dpkg-genchanges: info: binary-only upload (no source code included)
- dpkg-source --after-build .
-dpkg-buildpackage: info: binary-only upload (no source included)
-dpkg-genchanges: info: not including original source code in upload
+FAIL
+FAIL	github.com/xiang90/probing	0.302s
+FAIL
+dh_auto_test: error: cd obj-arm-linux-gnueabihf && go test -vet=off -v -p 4 github.com/xiang90/probing returned exit code 1
+make: *** [debian/rules:4: build] Error 25
+dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
 I: copying local configuration
+E: Failed autobuilding of package
+I: user script /srv/workspace/pbuilder/3506/tmp/hooks/C01_cleanup starting
+debug output: disk usage on i-capture-the-hostname at Sat Jan 13 02:16:47 UTC 2024
+Filesystem      Size  Used Avail Use% Mounted on
+tmpfs           1.9G     0  1.9G   0% /dev/shm
+
+I: user script /srv/workspace/pbuilder/3506/tmp/hooks/C01_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/20709 and its subdirectories
-I: Current time: Fri Jan 12 14:05:40 -12 2024
-I: pbuilder-time-stamp: 1705111540
+I: removing directory /srv/workspace/pbuilder/3506 and its subdirectories