Diff of the two buildlogs:

--
--- b1/build.log	2020-06-16 11:42:47.454955438 +0000
+++ b2/build.log	2020-06-16 11:44:36.472789337 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Jun 15 23:35:30 -12 2020
-I: pbuilder-time-stamp: 1592307330
+I: Current time: Tue Jul 20 08:05:47 +14 2021
+I: pbuilder-time-stamp: 1626717947
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/buster-reproducible-base.tgz]
 I: copying local configuration
@@ -18,7 +18,7 @@
 I: Extracting source
 gpgv: unknown type of key resource 'trustedkeys.kbx'
 gpgv: keyblock resource '/root/.gnupg/trustedkeys.kbx': General error
-gpgv: Signature made Mon Jan  7 20:27:59 2019 -12
+gpgv: Signature made Tue Jan  8 22:27:59 2019 +14
 gpgv:                using RSA key 142421B19AD4A95996F95072EA2500B412C59ACF
 gpgv: Can't check signature: No public key
 dpkg-source: warning: failed to verify signature on ./golang-github-cznic-mathutil_0.0~git20181122.297441e-2.dsc
@@ -27,138 +27,172 @@
 dpkg-source: info: unpacking golang-github-cznic-mathutil_0.0~git20181122.297441e-2.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/27704/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/6947/tmp/hooks/D01_modify_environment starting
+debug: Running on profitbricks-build16-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
+Removing 'diversion of /bin/sh to /bin/sh.distrib by dash'
+Adding 'diversion of /bin/sh to /bin/sh.distrib by bash'
+Removing 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by dash'
+Adding 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by 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/6947/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/6947/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build'
-  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=10'
-  DISTRIBUTION=''
-  HOME='/root'
-  HOST_ARCH='i386'
+  BASH=/bin/sh
+  BASHOPTS=checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:hostcomplete:interactive_comments:progcomp:promptvars:sourcepath
+  BASH_ALIASES=()
+  BASH_ARGC=()
+  BASH_ARGV=()
+  BASH_CMDS=()
+  BASH_LINENO=([0]="12" [1]="0")
+  BASH_SOURCE=([0]="/tmp/hooks/D02_print_environment" [1]="/tmp/hooks/D02_print_environment")
+  BASH_VERSINFO=([0]="5" [1]="0" [2]="3" [3]="1" [4]="release" [5]="i686-pc-linux-gnu")
+  BASH_VERSION='5.0.3(1)-release'
+  BUILDDIR=/build
+  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=18'
+  DIRSTACK=()
+  DISTRIBUTION=
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=i686
+  HOST_ARCH=i386
   IFS=' 	
   '
-  INVOCATION_ID='df1ddee3152b45ea8133f2d08fea7919'
-  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='27704'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=271c3b0205ec43aabd6252ef661ae08d
+  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=6947
   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/tmp.chF6UP4KsM/pbuilderrc_jahi --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/buster-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/tmp.chF6UP4KsM/b1 --logfile b1/build.log golang-github-cznic-mathutil_0.0~git20181122.297441e-2.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://78.137.99.97:3128'
+  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/tmp.chF6UP4KsM/pbuilderrc_fFZD --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/buster-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/tmp.chF6UP4KsM/b2 --logfile b2/build.log golang-github-cznic-mathutil_0.0~git20181122.297441e-2.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://85.184.249.68:3128
 I: uname -a
-  Linux profitbricks-build2-i386 4.19.0-9-686-pae #1 SMP Debian 4.19.118-2+deb10u1 (2020-06-07) i686 GNU/Linux
+  Linux i-capture-the-hostname 4.19.0-9-amd64 #1 SMP Debian 4.19.118-2+deb10u1 (2020-06-07) x86_64 GNU/Linux
 I: ls -l /bin
-  total 5500
-  -rwxr-xr-x 1 root root 1302248 Apr 17  2019 bash
-  -rwxr-xr-x 3 root root   38280 Jul 10  2019 bunzip2
-  -rwxr-xr-x 3 root root   38280 Jul 10  2019 bzcat
-  lrwxrwxrwx 1 root root       6 Jul 10  2019 bzcmp -> bzdiff
-  -rwxr-xr-x 1 root root    2227 Jul 10  2019 bzdiff
-  lrwxrwxrwx 1 root root       6 Jul 10  2019 bzegrep -> bzgrep
-  -rwxr-xr-x 1 root root    4877 Jun 24  2019 bzexe
-  lrwxrwxrwx 1 root root       6 Jul 10  2019 bzfgrep -> bzgrep
-  -rwxr-xr-x 1 root root    3641 Jul 10  2019 bzgrep
-  -rwxr-xr-x 3 root root   38280 Jul 10  2019 bzip2
-  -rwxr-xr-x 1 root root   17768 Jul 10  2019 bzip2recover
-  lrwxrwxrwx 1 root root       6 Jul 10  2019 bzless -> bzmore
-  -rwxr-xr-x 1 root root    1297 Jul 10  2019 bzmore
-  -rwxr-xr-x 1 root root   38692 Feb 28  2019 cat
-  -rwxr-xr-x 1 root root   75588 Feb 28  2019 chgrp
-  -rwxr-xr-x 1 root root   63268 Feb 28  2019 chmod
-  -rwxr-xr-x 1 root root   75588 Feb 28  2019 chown
-  -rwxr-xr-x 1 root root  153732 Feb 28  2019 cp
-  -rwxr-xr-x 1 root root  132820 Jan 17  2019 dash
-  -rwxr-xr-x 1 root root  120676 Feb 28  2019 date
-  -rwxr-xr-x 1 root root   92040 Feb 28  2019 dd
-  -rwxr-xr-x 1 root root  100620 Feb 28  2019 df
-  -rwxr-xr-x 1 root root  149736 Feb 28  2019 dir
-  -rwxr-xr-x 1 root root   79412 Jan  9  2019 dmesg
-  lrwxrwxrwx 1 root root       8 Sep 26  2018 dnsdomainname -> hostname
-  lrwxrwxrwx 1 root root       8 Sep 26  2018 domainname -> hostname
-  -rwxr-xr-x 1 root root   34532 Feb 28  2019 echo
-  -rwxr-xr-x 1 root root      28 Jan  7  2019 egrep
-  -rwxr-xr-x 1 root root   34532 Feb 28  2019 false
-  -rwxr-xr-x 1 root root      28 Jan  7  2019 fgrep
-  -rwxr-xr-x 1 root root   67700 Jan  9  2019 findmnt
-  -rwsr-xr-x 1 root root   30112 Apr 22 07:38 fusermount
-  -rwxr-xr-x 1 root root  206392 Jan  7  2019 grep
-  -rwxr-xr-x 2 root root    2345 Jan  5  2019 gunzip
-  -rwxr-xr-x 1 root root    6375 Jan  5  2019 gzexe
-  -rwxr-xr-x 1 root root  100952 Jan  5  2019 gzip
-  -rwxr-xr-x 1 root root   21916 Sep 26  2018 hostname
-  -rwxr-xr-x 1 root root   79752 Feb 28  2019 ln
-  -rwxr-xr-x 1 root root   55400 Jul 26  2018 login
-  -rwxr-xr-x 1 root root  149736 Feb 28  2019 ls
-  -rwxr-xr-x 1 root root  112032 Jan  9  2019 lsblk
-  -rwxr-xr-x 1 root root   87972 Feb 28  2019 mkdir
-  -rwxr-xr-x 1 root root   79748 Feb 28  2019 mknod
-  -rwxr-xr-x 1 root root   46916 Feb 28  2019 mktemp
-  -rwxr-xr-x 1 root root   42348 Jan  9  2019 more
-  -rwsr-xr-x 1 root root   50592 Jan  9  2019 mount
-  -rwxr-xr-x 1 root root   13724 Jan  9  2019 mountpoint
-  -rwxr-xr-x 1 root root  157832 Feb 28  2019 mv
-  lrwxrwxrwx 1 root root       8 Sep 26  2018 nisdomainname -> hostname
-  lrwxrwxrwx 1 root root      14 Feb 14  2019 pidof -> /sbin/killall5
-  -rwxr-xr-x 1 root root   38660 Feb 28  2019 pwd
-  lrwxrwxrwx 1 root root       4 Apr 17  2019 rbash -> bash
-  -rwxr-xr-x 1 root root   46852 Feb 28  2019 readlink
-  -rwxr-xr-x 1 root root   75588 Feb 28  2019 rm
-  -rwxr-xr-x 1 root root   42756 Feb 28  2019 rmdir
-  -rwxr-xr-x 1 root root   22276 Jan 21  2019 run-parts
-  -rwxr-xr-x 1 root root  125036 Dec 22  2018 sed
-  lrwxrwxrwx 1 root root       4 Jun 14 20:33 sh -> dash
-  -rwxr-xr-x 1 root root   34532 Feb 28  2019 sleep
-  -rwxr-xr-x 1 root root   79652 Feb 28  2019 stty
-  -rwsr-xr-x 1 root root   71072 Jan  9  2019 su
-  -rwxr-xr-x 1 root root   34564 Feb 28  2019 sync
-  -rwxr-xr-x 1 root root  504024 Apr 23  2019 tar
-  -rwxr-xr-x 1 root root   13860 Jan 21  2019 tempfile
-  -rwxr-xr-x 1 root root  104292 Feb 28  2019 touch
-  -rwxr-xr-x 1 root root   34532 Feb 28  2019 true
-  -rwxr-xr-x 1 root root   17768 Apr 22 07:38 ulockmgr_server
-  -rwsr-xr-x 1 root root   30108 Jan  9  2019 umount
-  -rwxr-xr-x 1 root root   34532 Feb 28  2019 uname
-  -rwxr-xr-x 2 root root    2345 Jan  5  2019 uncompress
-  -rwxr-xr-x 1 root root  149736 Feb 28  2019 vdir
-  -rwxr-xr-x 1 root root   34208 Jan  9  2019 wdctl
-  -rwxr-xr-x 1 root root     946 Jan 21  2019 which
-  lrwxrwxrwx 1 root root       8 Sep 26  2018 ypdomainname -> hostname
-  -rwxr-xr-x 1 root root    1983 Jan  5  2019 zcat
-  -rwxr-xr-x 1 root root    1677 Jan  5  2019 zcmp
-  -rwxr-xr-x 1 root root    5879 Jan  5  2019 zdiff
-  -rwxr-xr-x 1 root root      29 Jan  5  2019 zegrep
-  -rwxr-xr-x 1 root root      29 Jan  5  2019 zfgrep
-  -rwxr-xr-x 1 root root    2080 Jan  5  2019 zforce
-  -rwxr-xr-x 1 root root    7584 Jan  5  2019 zgrep
-  -rwxr-xr-x 1 root root    2205 Jan  5  2019 zless
-  -rwxr-xr-x 1 root root    1841 Jan  5  2019 zmore
-  -rwxr-xr-x 1 root root    4552 Jan  5  2019 znew
-I: user script /srv/workspace/pbuilder/27704/tmp/hooks/D02_print_environment finished
+  total 5476
+  -rwxr-xr-x 1 root root 1302248 Apr 18  2019 bash
+  -rwxr-xr-x 3 root root   38280 Jul 11  2019 bunzip2
+  -rwxr-xr-x 3 root root   38280 Jul 11  2019 bzcat
+  lrwxrwxrwx 1 root root       6 Jul 11  2019 bzcmp -> bzdiff
+  -rwxr-xr-x 1 root root    2227 Jul 11  2019 bzdiff
+  lrwxrwxrwx 1 root root       6 Jul 11  2019 bzegrep -> bzgrep
+  -rwxr-xr-x 1 root root    4877 Jun 25  2019 bzexe
+  lrwxrwxrwx 1 root root       6 Jul 11  2019 bzfgrep -> bzgrep
+  -rwxr-xr-x 1 root root    3641 Jul 11  2019 bzgrep
+  -rwxr-xr-x 3 root root   38280 Jul 11  2019 bzip2
+  -rwxr-xr-x 1 root root   17768 Jul 11  2019 bzip2recover
+  lrwxrwxrwx 1 root root       6 Jul 11  2019 bzless -> bzmore
+  -rwxr-xr-x 1 root root    1297 Jul 11  2019 bzmore
+  -rwxr-xr-x 1 root root   38692 Mar  1  2019 cat
+  -rwxr-xr-x 1 root root   75588 Mar  1  2019 chgrp
+  -rwxr-xr-x 1 root root   63268 Mar  1  2019 chmod
+  -rwxr-xr-x 1 root root   75588 Mar  1  2019 chown
+  -rwxr-xr-x 1 root root  153732 Mar  1  2019 cp
+  -rwxr-xr-x 1 root root  132820 Jan 18  2019 dash
+  -rwxr-xr-x 1 root root  120676 Mar  1  2019 date
+  -rwxr-xr-x 1 root root   92040 Mar  1  2019 dd
+  -rwxr-xr-x 1 root root  100620 Mar  1  2019 df
+  -rwxr-xr-x 1 root root  149736 Mar  1  2019 dir
+  -rwxr-xr-x 1 root root   79412 Jan 10  2019 dmesg
+  lrwxrwxrwx 1 root root       8 Sep 27  2018 dnsdomainname -> hostname
+  lrwxrwxrwx 1 root root       8 Sep 27  2018 domainname -> hostname
+  -rwxr-xr-x 1 root root   34532 Mar  1  2019 echo
+  -rwxr-xr-x 1 root root      28 Jan  8  2019 egrep
+  -rwxr-xr-x 1 root root   34532 Mar  1  2019 false
+  -rwxr-xr-x 1 root root      28 Jan  8  2019 fgrep
+  -rwxr-xr-x 1 root root   67700 Jan 10  2019 findmnt
+  -rwsr-xr-x 1 root root   30112 Apr 23  2020 fusermount
+  -rwxr-xr-x 1 root root  206392 Jan  8  2019 grep
+  -rwxr-xr-x 2 root root    2345 Jan  6  2019 gunzip
+  -rwxr-xr-x 1 root root    6375 Jan  6  2019 gzexe
+  -rwxr-xr-x 1 root root  100952 Jan  6  2019 gzip
+  -rwxr-xr-x 1 root root   21916 Sep 27  2018 hostname
+  -rwxr-xr-x 1 root root   79752 Mar  1  2019 ln
+  -rwxr-xr-x 1 root root   55400 Jul 27  2018 login
+  -rwxr-xr-x 1 root root  149736 Mar  1  2019 ls
+  -rwxr-xr-x 1 root root  112032 Jan 10  2019 lsblk
+  -rwxr-xr-x 1 root root   87972 Mar  1  2019 mkdir
+  -rwxr-xr-x 1 root root   79748 Mar  1  2019 mknod
+  -rwxr-xr-x 1 root root   46916 Mar  1  2019 mktemp
+  -rwxr-xr-x 1 root root   42348 Jan 10  2019 more
+  -rwsr-xr-x 1 root root   50592 Jan 10  2019 mount
+  -rwxr-xr-x 1 root root   13724 Jan 10  2019 mountpoint
+  -rwxr-xr-x 1 root root  157832 Mar  1  2019 mv
+  lrwxrwxrwx 1 root root       8 Sep 27  2018 nisdomainname -> hostname
+  lrwxrwxrwx 1 root root      14 Feb 15  2019 pidof -> /sbin/killall5
+  -rwxr-xr-x 1 root root   38660 Mar  1  2019 pwd
+  lrwxrwxrwx 1 root root       4 Apr 18  2019 rbash -> bash
+  -rwxr-xr-x 1 root root   46852 Mar  1  2019 readlink
+  -rwxr-xr-x 1 root root   75588 Mar  1  2019 rm
+  -rwxr-xr-x 1 root root   42756 Mar  1  2019 rmdir
+  -rwxr-xr-x 1 root root   22276 Jan 22  2019 run-parts
+  -rwxr-xr-x 1 root root  125036 Dec 23  2018 sed
+  lrwxrwxrwx 1 root root       4 Jul 20 08:05 sh -> bash
+  lrwxrwxrwx 1 root root       4 Jul 20 04:48 sh.distrib -> dash
+  -rwxr-xr-x 1 root root   34532 Mar  1  2019 sleep
+  -rwxr-xr-x 1 root root   79652 Mar  1  2019 stty
+  -rwsr-xr-x 1 root root   71072 Jan 10  2019 su
+  -rwxr-xr-x 1 root root   34564 Mar  1  2019 sync
+  -rwxr-xr-x 1 root root  504024 Apr 24  2019 tar
+  -rwxr-xr-x 1 root root   13860 Jan 22  2019 tempfile
+  -rwxr-xr-x 1 root root  104292 Mar  1  2019 touch
+  -rwxr-xr-x 1 root root   34532 Mar  1  2019 true
+  -rwxr-xr-x 1 root root   17768 Apr 23  2020 ulockmgr_server
+  -rwsr-xr-x 1 root root   30108 Jan 10  2019 umount
+  -rwxr-xr-x 1 root root   34532 Mar  1  2019 uname
+  -rwxr-xr-x 2 root root    2345 Jan  6  2019 uncompress
+  -rwxr-xr-x 1 root root  149736 Mar  1  2019 vdir
+  -rwxr-xr-x 1 root root   34208 Jan 10  2019 wdctl
+  -rwxr-xr-x 1 root root     946 Jan 22  2019 which
+  lrwxrwxrwx 1 root root       8 Sep 27  2018 ypdomainname -> hostname
+  -rwxr-xr-x 1 root root    1983 Jan  6  2019 zcat
+  -rwxr-xr-x 1 root root    1677 Jan  6  2019 zcmp
+  -rwxr-xr-x 1 root root    5879 Jan  6  2019 zdiff
+  -rwxr-xr-x 1 root root      29 Jan  6  2019 zegrep
+  -rwxr-xr-x 1 root root      29 Jan  6  2019 zfgrep
+  -rwxr-xr-x 1 root root    2080 Jan  6  2019 zforce
+  -rwxr-xr-x 1 root root    7584 Jan  6  2019 zgrep
+  -rwxr-xr-x 1 root root    2205 Jan  6  2019 zless
+  -rwxr-xr-x 1 root root    1841 Jan  6  2019 zmore
+  -rwxr-xr-x 1 root root    4552 Jan  6  2019 znew
+I: user script /srv/workspace/pbuilder/6947/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -240,7 +274,7 @@
 Get: 38 http://deb.debian.org/debian buster/main i386 golang-go i386 2:1.11~1 [23.4 kB]
 Get: 39 http://deb.debian.org/debian buster/main i386 golang-any i386 2:1.11~1 [4472 B]
 Get: 40 http://deb.debian.org/debian buster/main i386 golang-github-remyoudompheng-bigfft-dev all 0.0~git20170806.52369c6-1 [15.7 kB]
-Fetched 74.3 MB in 11s (6600 kB/s)
+Fetched 74.3 MB in 1s (78.7 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libbsd0:i386.
 (Reading database ... 
(Reading database ... 5%
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(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19234 files and directories currently installed.)
@@ -423,7 +457,7 @@
 fakeroot is already the newest version (1.23-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/golang-github-cznic-mathutil-0.0~git20181122.297441e/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b
+I: Running cd /build/golang-github-cznic-mathutil-0.0~git20181122.297441e/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b
 dpkg-buildpackage: info: source package golang-github-cznic-mathutil
 dpkg-buildpackage: info: source version 0.0~git20181122.297441e-2
 dpkg-buildpackage: info: source distribution unstable
@@ -441,19 +475,19 @@
    dh_autoreconf -O--buildsystem=golang
    dh_auto_configure -O--buildsystem=golang
    dh_auto_build -O--buildsystem=golang
-	cd obj-i686-linux-gnu && go install -gcflags=all=\"-trimpath=/build/golang-github-cznic-mathutil-0.0\~git20181122.297441e/obj-i686-linux-gnu/src\" -asmflags=all=\"-trimpath=/build/golang-github-cznic-mathutil-0.0\~git20181122.297441e/obj-i686-linux-gnu/src\" -v -p 10 github.com/cznic/mathutil github.com/cznic/mathutil/mersenne
-internal/race
-math/bits
+	cd obj-i686-linux-gnu && go install -gcflags=all=\"-trimpath=/build/golang-github-cznic-mathutil-0.0\~git20181122.297441e/obj-i686-linux-gnu/src\" -asmflags=all=\"-trimpath=/build/golang-github-cznic-mathutil-0.0\~git20181122.297441e/obj-i686-linux-gnu/src\" -v -p 18 github.com/cznic/mathutil github.com/cznic/mathutil/mersenne
 unicode/utf8
 errors
+internal/race
 unicode
 internal/cpu
 runtime/internal/atomic
 runtime/internal/sys
 sync/atomic
+math/bits
 math
-internal/bytealg
 internal/testlog
+internal/bytealg
 runtime
 strconv
 sync
@@ -466,8 +500,8 @@
 internal/syscall/unix
 time
 internal/poll
-sort
 encoding/binary
+sort
 os
 fmt
 math/big
@@ -475,53 +509,53 @@
 github.com/cznic/mathutil
 github.com/cznic/mathutil/mersenne
    dh_auto_test -O--buildsystem=golang
-	cd obj-i686-linux-gnu && go test -vet=off -v -p 10 github.com/cznic/mathutil github.com/cznic/mathutil/mersenne
+	cd obj-i686-linux-gnu && go test -vet=off -v -p 18 github.com/cznic/mathutil github.com/cznic/mathutil/mersenne
 === RUN   Test0
---- PASS: Test0 (0.52s)
+--- PASS: Test0 (0.22s)
 === RUN   Test1
---- PASS: Test1 (0.82s)
+--- PASS: Test1 (0.59s)
 === RUN   Test2
---- PASS: Test2 (0.89s)
+--- PASS: Test2 (0.58s)
 === RUN   TestBig0
---- PASS: TestBig0 (0.53s)
+--- PASS: TestBig0 (0.27s)
 === RUN   TestBig1
---- PASS: TestBig1 (0.56s)
+--- PASS: TestBig1 (0.35s)
 === RUN   TestBig2
---- PASS: TestBig2 (0.60s)
+--- PASS: TestBig2 (0.35s)
 === RUN   TestPermutations
 --- PASS: TestPermutations (0.00s)
 === RUN   TestIsPrime
---- PASS: TestIsPrime (0.46s)
+--- PASS: TestIsPrime (0.36s)
     all_test.go:579: 283146
 === RUN   TestNextPrime
---- PASS: TestNextPrime (0.44s)
+--- PASS: TestNextPrime (0.35s)
     all_test.go:653: 283146
 === RUN   TestNextPrime2
 --- PASS: TestNextPrime2 (0.00s)
 === RUN   TestNextPrimeUint64
---- PASS: TestNextPrimeUint64 (2.33s)
+--- PASS: TestNextPrimeUint64 (1.28s)
 === RUN   TestISqrt
---- PASS: TestISqrt (2.37s)
+--- PASS: TestISqrt (2.59s)
 === RUN   TestSqrtUint64
---- PASS: TestSqrtUint64 (30.92s)
+--- PASS: TestSqrtUint64 (31.97s)
 === RUN   TestSqrtBig
---- PASS: TestSqrtBig (1.01s)
+--- PASS: TestSqrtBig (0.52s)
 === RUN   TestFactorInt
---- PASS: TestFactorInt (2.09s)
+--- PASS: TestFactorInt (1.40s)
 === RUN   TestFactorIntB
---- PASS: TestFactorIntB (0.43s)
+--- PASS: TestFactorIntB (0.19s)
 === RUN   TestIsPrimeUint16
 --- PASS: TestIsPrimeUint16 (0.00s)
 === RUN   TestNextPrimeUint16
 --- PASS: TestNextPrimeUint16 (0.00s)
 === RUN   TestPopCount
---- PASS: TestPopCount (0.75s)
+--- PASS: TestPopCount (0.45s)
 === RUN   TestGCD
 --- PASS: TestGCD (0.00s)
 === RUN   TestLog2
---- PASS: TestLog2 (1.69s)
+--- PASS: TestLog2 (1.02s)
 === RUN   TestBitLen
---- PASS: TestBitLen (1.98s)
+--- PASS: TestBitLen (1.21s)
 === RUN   TestUintptrBits
 --- PASS: TestUintptrBits (0.00s)
     all_test.go:1576: 32
@@ -536,29 +570,29 @@
 === RUN   TestModPowBigInt
 --- PASS: TestModPowBigInt (0.00s)
 === RUN   TestAdd128
---- PASS: TestAdd128 (0.45s)
+--- PASS: TestAdd128 (0.21s)
 === RUN   TestMul128
---- PASS: TestMul128 (0.81s)
+--- PASS: TestMul128 (0.39s)
 === RUN   TestIsPrimeUint64
---- PASS: TestIsPrimeUint64 (1.87s)
+--- PASS: TestIsPrimeUint64 (0.91s)
 === RUN   TestProbablyPrimeUint32
---- PASS: TestProbablyPrimeUint32 (17.05s)
+--- PASS: TestProbablyPrimeUint32 (11.83s)
 === RUN   TestProbablyPrimeUint64_32
---- PASS: TestProbablyPrimeUint64_32 (7.18s)
+--- PASS: TestProbablyPrimeUint64_32 (3.02s)
 === RUN   TestProbablyPrimeBigInt_32
---- PASS: TestProbablyPrimeBigInt_32 (7.85s)
+--- PASS: TestProbablyPrimeBigInt_32 (3.10s)
 === RUN   TestProbablyPrimeBigInt
---- PASS: TestProbablyPrimeBigInt (10.08s)
+--- PASS: TestProbablyPrimeBigInt (3.08s)
 === RUN   TestQCmpUint32
---- PASS: TestQCmpUint32 (0.15s)
+--- PASS: TestQCmpUint32 (0.08s)
 === RUN   TestQScaleUint32
---- PASS: TestQScaleUint32 (0.21s)
+--- PASS: TestQScaleUint32 (0.09s)
 === RUN   TestPrimorialProductsUint32
---- PASS: TestPrimorialProductsUint32 (0.54s)
+--- PASS: TestPrimorialProductsUint32 (0.13s)
 === RUN   TestPowerizeUint32BigInt
---- PASS: TestPowerizeUint32BigInt (2.15s)
+--- PASS: TestPowerizeUint32BigInt (0.46s)
 === RUN   TestPowerizeBigInt
---- PASS: TestPowerizeBigInt (0.88s)
+--- PASS: TestPowerizeBigInt (0.39s)
 === RUN   TestEnvelope
 --- PASS: TestEnvelope (0.00s)
 === RUN   TestMaxInt
@@ -711,7 +745,7 @@
 === RUN   TestClampInt64
 --- PASS: TestClampInt64 (0.00s)
 === RUN   TestPopCountBigInt
---- PASS: TestPopCountBigInt (0.19s)
+--- PASS: TestPopCountBigInt (0.15s)
 === RUN   TestToBase
 --- PASS: TestToBase (0.00s)
 === RUN   TestBug
@@ -720,7 +754,7 @@
 === RUN   TestQuadPolyDiscriminantBig
 --- PASS: TestQuadPolyDiscriminantBig (0.00s)
 === RUN   TestQuadPolyFactorsBig
---- PASS: TestQuadPolyFactorsBig (14.40s)
+--- PASS: TestQuadPolyFactorsBig (3.36s)
     all_test.go:5328: 0: 404153945743547657(3440579354231278675x+608747136543856411)(5571782338101878760x+1926012586526624009) = 7747695513036590874160580452610747249070874699923051000x^2+4048978187635461401700698616878049656747118240631996795x+473852171788593203136603087723066289885075485406159243 -> 404153945743547657(3440579354231278675x+608747136543856411)(5571782338101878760x+1926012586526624009) = 7747695513036590874160580452610747249070874699923051000x^2+4048978187635461401700698616878049656747118240631996795x+473852171788593203136603087723066289885075485406159243
     all_test.go:5328: 1: 5961769557461764184(3534334367214237261x+7497468244883513247)(3545887102062614208x+3532963341805492868) = 74714986571207295362048106684982398414367316912019220992x^2+232937364123247719548118154447926589496446900266191234016x+157917024108871423942300285207552737383222905238198664864 -> 71541234689541170208(886471775515653552x+883240835451373217)(1178111455738079087x+2499156081627837749) = 74714986571207295362048106684982398414367316912019220992x^2+232937364123247719548118154447926589496446900266191234016x+157917024108871423942300285207552737383222905238198664864
     all_test.go:5328: 2: 6124420007038740542(6784982874943501314x+2010156224608899041)(3335934666146214990x+1118224062840270781) = 138621712226870440290270830317383565791100195810147698120x^2+87535606053078302613099290253926573305569933635752666608x+13766502283994835432023315092659898734304727481675333382 -> 6124420007038740542(6784982874943501314x+2010156224608899041)(3335934666146214990x+1118224062840270781) = 138621712226870440290270830317383565791100195810147698120x^2+87535606053078302613099290253926573305569933635752666608x+13766502283994835432023315092659898734304727481675333382
@@ -111974,7 +112008,7 @@
 === RUN   TestQuadPolyDiscriminant
 --- PASS: TestQuadPolyDiscriminant (0.00s)
 === RUN   TestQuadPolyFactors
---- PASS: TestQuadPolyFactors (2.62s)
+--- PASS: TestQuadPolyFactors (0.87s)
     all_test.go:5465: 0: 9(83x+27)(104x+9) = 77688x^2+31995x+2187 -> 9(104x+9)(83x+27) = 77688x^2+31995x+2187
     all_test.go:5465: 1: 88(77x+31)(64x+4) = 433664x^2+201696x+10912 -> 352(16x+1)(77x+31) = 433664x^2+201696x+10912
     all_test.go:5465: 2: 62(2x+97)(78x+61) = 9672x^2+476656x+366854 -> 62(78x+61)(2x+97) = 9672x^2+476656x+366854
@@ -223226,7 +223260,7 @@
     all_test.go:5465: 111248: -(7x+7)(7x+7) = -49x^2-98x-49 -> -49(x+1)(x+1) = -49x^2-98x-49
     all_test.go:5465: 111249: (7x+7)(7x+7) = 49x^2+98x+49 -> 49(x+1)(x+1) = 49x^2+98x+49
 === RUN   TestFCPRNG
---- PASS: TestFCPRNG (0.08s)
+--- PASS: TestFCPRNG (0.05s)
     all_test.go:5550: [43690 43691 43691]
 === RUN   TestNewFloat
 --- PASS: TestNewFloat (0.00s)
@@ -223249,29 +223283,29 @@
 === RUN   TestInt128Add
 --- PASS: TestInt128Add (0.00s)
 === RUN   TestInt128Add2
---- PASS: TestInt128Add2 (2.21s)
+--- PASS: TestInt128Add2 (0.83s)
 === RUN   TestInt128BigInt
 --- PASS: TestInt128BigInt (0.00s)
 === RUN   TestInt128BigInt2
---- PASS: TestInt128BigInt2 (2.89s)
+--- PASS: TestInt128BigInt2 (0.88s)
 === RUN   TestInt128Cmp
 --- PASS: TestInt128Cmp (0.00s)
 === RUN   TestInt128Cmp2
---- PASS: TestInt128Cmp2 (2.99s)
+--- PASS: TestInt128Cmp2 (1.13s)
 === RUN   TestInt128Neg
 --- PASS: TestInt128Neg (0.00s)
 === RUN   TestInt128Neg2
---- PASS: TestInt128Neg2 (2.44s)
+--- PASS: TestInt128Neg2 (0.92s)
 === RUN   TestInt128SetInt64
---- PASS: TestInt128SetInt64 (2.19s)
+--- PASS: TestInt128SetInt64 (0.83s)
 === RUN   TestInt128SetUint64
---- PASS: TestInt128SetUint64 (2.11s)
+--- PASS: TestInt128SetUint64 (0.82s)
 === RUN   ExampleBinaryLog
 --- PASS: ExampleBinaryLog (0.00s)
 PASS
-ok  	github.com/cznic/mathutil	129.871s
+ok  	github.com/cznic/mathutil	77.236s
 === RUN   TestNew
---- PASS: TestNew (1.06s)
+--- PASS: TestNew (0.47s)
 === RUN   TestHasFactorUint32
 --- PASS: TestHasFactorUint32 (0.00s)
 === RUN   TestHasFactorUint64
@@ -223281,13 +223315,13 @@
 === RUN   TestFromFactorBigInt
 --- PASS: TestFromFactorBigInt (0.02s)
 === RUN   TestMod
---- PASS: TestMod (1.78s)
+--- PASS: TestMod (0.61s)
 === RUN   TestModPow
---- PASS: TestModPow (1.30s)
+--- PASS: TestModPow (0.76s)
 === RUN   TestModPow2
 --- PASS: TestModPow2 (0.00s)
 PASS
-ok  	github.com/cznic/mathutil/mersenne	4.171s
+ok  	github.com/cznic/mathutil/mersenne	1.859s
    create-stamp debian/debhelper-build-stamp
  fakeroot debian/rules binary
 dh binary --buildsystem=golang --with=golang
@@ -223315,12 +223349,14 @@
  dpkg-source --after-build .
 dpkg-buildpackage: info: binary-only upload (no source included)
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/6947/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/6947/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/27704 and its subdirectories
-I: Current time: Mon Jun 15 23:42:46 -12 2020
-I: pbuilder-time-stamp: 1592307766
+I: removing directory /srv/workspace/pbuilder/6947 and its subdirectories
+I: Current time: Tue Jul 20 08:07:34 +14 2021
+I: pbuilder-time-stamp: 1626718054