Diff of the two buildlogs:

--
--- b1/build.log	2021-08-02 20:54:29.165333157 +0000
+++ b2/build.log	2021-08-02 20:56:28.668832621 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Aug  2 08:51:23 -12 2021
-I: pbuilder-time-stamp: 1627937483
+I: Current time: Tue Aug  3 10:54:37 +14 2021
+I: pbuilder-time-stamp: 1627937677
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bullseye-reproducible-base.tgz]
 I: copying local configuration
@@ -16,8 +16,8 @@
 I: copying [./golang-golang-x-sync_0.0~git20210220.036812b-1.debian.tar.xz]
 I: Extracting source
 gpgv: unknown type of key resource 'trustedkeys.kbx'
-gpgv: keyblock resource '/tmp/dpkg-verify-sig.vCQTl9Pw/trustedkeys.kbx': General error
-gpgv: Signature made Tue Feb 23 05:32:58 2021 -12
+gpgv: keyblock resource '/tmp/dpkg-verify-sig.oUADT4qE/trustedkeys.kbx': General error
+gpgv: Signature made Wed Feb 24 07:32:58 2021 +14
 gpgv:                using RSA key 142421B19AD4A95996F95072EA2500B412C59ACF
 gpgv:                issuer "foka@debian.org"
 gpgv: Can't check signature: No public key
@@ -27,135 +27,169 @@
 dpkg-source: info: unpacking golang-golang-x-sync_0.0~git20210220.036812b-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3429/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/7163/tmp/hooks/D01_modify_environment starting
+debug: Running on virt32c.
+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/7163/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/7163/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='armhf'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all,-fixfilepath parallel=3'
-  DISTRIBUTION=''
-  HOME='/root'
-  HOST_ARCH='armhf'
+  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]="1" [2]="4" [3]="1" [4]="release" [5]="arm-unknown-linux-gnueabihf")
+  BASH_VERSION='5.1.4(1)-release'
+  BUILDDIR=/build
+  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,-fixfilepath parallel=4'
+  DIRSTACK=()
+  DISTRIBUTION=
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='f33a2d5d5db5496884b897b52f7665e5'
-  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='3429'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=bb5d35847b8b4182be621e58f211ba8b
+  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=7163
   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.jEB3YNcysc/pbuilderrc_CGtP --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bullseye-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/tmp.jEB3YNcysc/b1 --logfile b1/build.log golang-golang-x-sync_0.0~git20210220.036812b-1.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://10.0.0.15:8000/'
+  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.jEB3YNcysc/pbuilderrc_ilAJ --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bullseye-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/tmp.jEB3YNcysc/b2 --logfile b2/build.log --extrapackages usrmerge golang-golang-x-sync_0.0~git20210220.036812b-1.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://10.0.0.15:8000/
 I: uname -a
-  Linux virt64c 5.10.0-8-arm64 #1 SMP Debian 5.10.46-3 (2021-07-28) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 5.10.0-8-armmp-lpae #1 SMP Debian 5.10.46-3 (2021-07-28) armv7l GNU/Linux
 I: ls -l /bin
   total 3580
-  -rwxr-xr-x 1 root root 816764 Jun 21 14:26 bash
-  -rwxr-xr-x 3 root root  26052 Jul 20  2020 bunzip2
-  -rwxr-xr-x 3 root root  26052 Jul 20  2020 bzcat
-  lrwxrwxrwx 1 root root      6 Jul 20  2020 bzcmp -> bzdiff
-  -rwxr-xr-x 1 root root   2225 Jul 20  2020 bzdiff
-  lrwxrwxrwx 1 root root      6 Jul 20  2020 bzegrep -> bzgrep
-  -rwxr-xr-x 1 root root   4877 Sep  4  2019 bzexe
-  lrwxrwxrwx 1 root root      6 Jul 20  2020 bzfgrep -> bzgrep
-  -rwxr-xr-x 1 root root   3775 Jul 20  2020 bzgrep
-  -rwxr-xr-x 3 root root  26052 Jul 20  2020 bzip2
-  -rwxr-xr-x 1 root root   9636 Jul 20  2020 bzip2recover
-  lrwxrwxrwx 1 root root      6 Jul 20  2020 bzless -> bzmore
-  -rwxr-xr-x 1 root root   1297 Jul 20  2020 bzmore
-  -rwxr-xr-x 1 root root  26668 Sep 22  2020 cat
-  -rwxr-xr-x 1 root root  43104 Sep 22  2020 chgrp
-  -rwxr-xr-x 1 root root  38984 Sep 22  2020 chmod
-  -rwxr-xr-x 1 root root  43112 Sep 22  2020 chown
-  -rwxr-xr-x 1 root root  92616 Sep 22  2020 cp
-  -rwxr-xr-x 1 root root  75524 Dec 10  2020 dash
-  -rwxr-xr-x 1 root root  75880 Sep 22  2020 date
-  -rwxr-xr-x 1 root root  55436 Sep 22  2020 dd
-  -rwxr-xr-x 1 root root  59912 Sep 22  2020 df
-  -rwxr-xr-x 1 root root  96764 Sep 22  2020 dir
-  -rwxr-xr-x 1 root root  55012 Jul 28 07:09 dmesg
-  lrwxrwxrwx 1 root root      8 Nov  6  2019 dnsdomainname -> hostname
-  lrwxrwxrwx 1 root root      8 Nov  6  2019 domainname -> hostname
-  -rwxr-xr-x 1 root root  22508 Sep 22  2020 echo
-  -rwxr-xr-x 1 root root     28 Nov  9  2020 egrep
-  -rwxr-xr-x 1 root root  22496 Sep 22  2020 false
-  -rwxr-xr-x 1 root root     28 Nov  9  2020 fgrep
-  -rwxr-xr-x 1 root root  47492 Jul 28 07:09 findmnt
-  -rwsr-xr-x 1 root root  26076 Feb 26 04:12 fusermount
-  -rwxr-xr-x 1 root root 124508 Nov  9  2020 grep
-  -rwxr-xr-x 2 root root   2346 Mar  2 11:30 gunzip
-  -rwxr-xr-x 1 root root   6376 Mar  2 11:30 gzexe
-  -rwxr-xr-x 1 root root  64212 Mar  2 11:30 gzip
-  -rwxr-xr-x 1 root root  13784 Nov  6  2019 hostname
-  -rwxr-xr-x 1 root root  43180 Sep 22  2020 ln
-  -rwxr-xr-x 1 root root  35068 Feb  7  2020 login
-  -rwxr-xr-x 1 root root  96764 Sep 22  2020 ls
-  -rwxr-xr-x 1 root root  99940 Jul 28 07:09 lsblk
-  -rwxr-xr-x 1 root root  51408 Sep 22  2020 mkdir
-  -rwxr-xr-x 1 root root  43184 Sep 22  2020 mknod
-  -rwxr-xr-x 1 root root  30780 Sep 22  2020 mktemp
-  -rwxr-xr-x 1 root root  34408 Jul 28 07:09 more
-  -rwsr-xr-x 1 root root  34400 Jul 28 07:09 mount
-  -rwxr-xr-x 1 root root   9824 Jul 28 07:09 mountpoint
-  -rwxr-xr-x 1 root root  88524 Sep 22  2020 mv
-  lrwxrwxrwx 1 root root      8 Nov  6  2019 nisdomainname -> hostname
-  lrwxrwxrwx 1 root root     14 Apr 18 03:38 pidof -> /sbin/killall5
-  -rwxr-xr-x 1 root root  26652 Sep 22  2020 pwd
-  lrwxrwxrwx 1 root root      4 Jun 21 14:26 rbash -> bash
-  -rwxr-xr-x 1 root root  30740 Sep 22  2020 readlink
-  -rwxr-xr-x 1 root root  43104 Sep 22  2020 rm
-  -rwxr-xr-x 1 root root  30732 Sep 22  2020 rmdir
-  -rwxr-xr-x 1 root root  14144 Sep 27  2020 run-parts
-  -rwxr-xr-x 1 root root  76012 Dec 22  2018 sed
-  lrwxrwxrwx 1 root root      4 Aug  1 21:25 sh -> dash
-  -rwxr-xr-x 1 root root  22532 Sep 22  2020 sleep
-  -rwxr-xr-x 1 root root  55360 Sep 22  2020 stty
-  -rwsr-xr-x 1 root root  46704 Jul 28 07:09 su
-  -rwxr-xr-x 1 root root  22532 Sep 22  2020 sync
-  -rwxr-xr-x 1 root root 340872 Feb 16 21:55 tar
-  -rwxr-xr-x 1 root root   9808 Sep 27  2020 tempfile
-  -rwxr-xr-x 1 root root  67696 Sep 22  2020 touch
-  -rwxr-xr-x 1 root root  22496 Sep 22  2020 true
-  -rwxr-xr-x 1 root root   9636 Feb 26 04:12 ulockmgr_server
-  -rwsr-xr-x 1 root root  22108 Jul 28 07:09 umount
-  -rwxr-xr-x 1 root root  22520 Sep 22  2020 uname
-  -rwxr-xr-x 2 root root   2346 Mar  2 11:30 uncompress
-  -rwxr-xr-x 1 root root  96764 Sep 22  2020 vdir
-  -rwxr-xr-x 1 root root  38512 Jul 28 07:09 wdctl
-  lrwxrwxrwx 1 root root      8 Nov  6  2019 ypdomainname -> hostname
-  -rwxr-xr-x 1 root root   1984 Mar  2 11:30 zcat
-  -rwxr-xr-x 1 root root   1678 Mar  2 11:30 zcmp
-  -rwxr-xr-x 1 root root   5880 Mar  2 11:30 zdiff
-  -rwxr-xr-x 1 root root     29 Mar  2 11:30 zegrep
-  -rwxr-xr-x 1 root root     29 Mar  2 11:30 zfgrep
-  -rwxr-xr-x 1 root root   2081 Mar  2 11:30 zforce
-  -rwxr-xr-x 1 root root   7585 Mar  2 11:30 zgrep
-  -rwxr-xr-x 1 root root   2206 Mar  2 11:30 zless
-  -rwxr-xr-x 1 root root   1842 Mar  2 11:30 zmore
-  -rwxr-xr-x 1 root root   4553 Mar  2 11:30 znew
-I: user script /srv/workspace/pbuilder/3429/tmp/hooks/D02_print_environment finished
+  -rwxr-xr-x 1 root root 816764 Jun 22 16:26 bash
+  -rwxr-xr-x 3 root root  26052 Jul 21  2020 bunzip2
+  -rwxr-xr-x 3 root root  26052 Jul 21  2020 bzcat
+  lrwxrwxrwx 1 root root      6 Jul 21  2020 bzcmp -> bzdiff
+  -rwxr-xr-x 1 root root   2225 Jul 21  2020 bzdiff
+  lrwxrwxrwx 1 root root      6 Jul 21  2020 bzegrep -> bzgrep
+  -rwxr-xr-x 1 root root   4877 Sep  5  2019 bzexe
+  lrwxrwxrwx 1 root root      6 Jul 21  2020 bzfgrep -> bzgrep
+  -rwxr-xr-x 1 root root   3775 Jul 21  2020 bzgrep
+  -rwxr-xr-x 3 root root  26052 Jul 21  2020 bzip2
+  -rwxr-xr-x 1 root root   9636 Jul 21  2020 bzip2recover
+  lrwxrwxrwx 1 root root      6 Jul 21  2020 bzless -> bzmore
+  -rwxr-xr-x 1 root root   1297 Jul 21  2020 bzmore
+  -rwxr-xr-x 1 root root  26668 Sep 23  2020 cat
+  -rwxr-xr-x 1 root root  43104 Sep 23  2020 chgrp
+  -rwxr-xr-x 1 root root  38984 Sep 23  2020 chmod
+  -rwxr-xr-x 1 root root  43112 Sep 23  2020 chown
+  -rwxr-xr-x 1 root root  92616 Sep 23  2020 cp
+  -rwxr-xr-x 1 root root  75524 Dec 11  2020 dash
+  -rwxr-xr-x 1 root root  75880 Sep 23  2020 date
+  -rwxr-xr-x 1 root root  55436 Sep 23  2020 dd
+  -rwxr-xr-x 1 root root  59912 Sep 23  2020 df
+  -rwxr-xr-x 1 root root  96764 Sep 23  2020 dir
+  -rwxr-xr-x 1 root root  55012 Jul 29 09:09 dmesg
+  lrwxrwxrwx 1 root root      8 Nov  8  2019 dnsdomainname -> hostname
+  lrwxrwxrwx 1 root root      8 Nov  8  2019 domainname -> hostname
+  -rwxr-xr-x 1 root root  22508 Sep 23  2020 echo
+  -rwxr-xr-x 1 root root     28 Nov 10  2020 egrep
+  -rwxr-xr-x 1 root root  22496 Sep 23  2020 false
+  -rwxr-xr-x 1 root root     28 Nov 10  2020 fgrep
+  -rwxr-xr-x 1 root root  47492 Jul 29 09:09 findmnt
+  -rwsr-xr-x 1 root root  26076 Feb 27 06:12 fusermount
+  -rwxr-xr-x 1 root root 124508 Nov 10  2020 grep
+  -rwxr-xr-x 2 root root   2346 Mar  3 13:30 gunzip
+  -rwxr-xr-x 1 root root   6376 Mar  3 13:30 gzexe
+  -rwxr-xr-x 1 root root  64212 Mar  3 13:30 gzip
+  -rwxr-xr-x 1 root root  13784 Nov  8  2019 hostname
+  -rwxr-xr-x 1 root root  43180 Sep 23  2020 ln
+  -rwxr-xr-x 1 root root  35068 Feb  8  2020 login
+  -rwxr-xr-x 1 root root  96764 Sep 23  2020 ls
+  -rwxr-xr-x 1 root root  99940 Jul 29 09:09 lsblk
+  -rwxr-xr-x 1 root root  51408 Sep 23  2020 mkdir
+  -rwxr-xr-x 1 root root  43184 Sep 23  2020 mknod
+  -rwxr-xr-x 1 root root  30780 Sep 23  2020 mktemp
+  -rwxr-xr-x 1 root root  34408 Jul 29 09:09 more
+  -rwsr-xr-x 1 root root  34400 Jul 29 09:09 mount
+  -rwxr-xr-x 1 root root   9824 Jul 29 09:09 mountpoint
+  -rwxr-xr-x 1 root root  88524 Sep 23  2020 mv
+  lrwxrwxrwx 1 root root      8 Nov  8  2019 nisdomainname -> hostname
+  lrwxrwxrwx 1 root root     14 Apr 19 05:38 pidof -> /sbin/killall5
+  -rwxr-xr-x 1 root root  26652 Sep 23  2020 pwd
+  lrwxrwxrwx 1 root root      4 Jun 22 16:26 rbash -> bash
+  -rwxr-xr-x 1 root root  30740 Sep 23  2020 readlink
+  -rwxr-xr-x 1 root root  43104 Sep 23  2020 rm
+  -rwxr-xr-x 1 root root  30732 Sep 23  2020 rmdir
+  -rwxr-xr-x 1 root root  14144 Sep 28  2020 run-parts
+  -rwxr-xr-x 1 root root  76012 Dec 23  2018 sed
+  lrwxrwxrwx 1 root root      4 Aug  3 10:54 sh -> bash
+  lrwxrwxrwx 1 root root      4 Aug  2 23:24 sh.distrib -> dash
+  -rwxr-xr-x 1 root root  22532 Sep 23  2020 sleep
+  -rwxr-xr-x 1 root root  55360 Sep 23  2020 stty
+  -rwsr-xr-x 1 root root  46704 Jul 29 09:09 su
+  -rwxr-xr-x 1 root root  22532 Sep 23  2020 sync
+  -rwxr-xr-x 1 root root 340872 Feb 17 23:55 tar
+  -rwxr-xr-x 1 root root   9808 Sep 28  2020 tempfile
+  -rwxr-xr-x 1 root root  67696 Sep 23  2020 touch
+  -rwxr-xr-x 1 root root  22496 Sep 23  2020 true
+  -rwxr-xr-x 1 root root   9636 Feb 27 06:12 ulockmgr_server
+  -rwsr-xr-x 1 root root  22108 Jul 29 09:09 umount
+  -rwxr-xr-x 1 root root  22520 Sep 23  2020 uname
+  -rwxr-xr-x 2 root root   2346 Mar  3 13:30 uncompress
+  -rwxr-xr-x 1 root root  96764 Sep 23  2020 vdir
+  -rwxr-xr-x 1 root root  38512 Jul 29 09:09 wdctl
+  lrwxrwxrwx 1 root root      8 Nov  8  2019 ypdomainname -> hostname
+  -rwxr-xr-x 1 root root   1984 Mar  3 13:30 zcat
+  -rwxr-xr-x 1 root root   1678 Mar  3 13:30 zcmp
+  -rwxr-xr-x 1 root root   5880 Mar  3 13:30 zdiff
+  -rwxr-xr-x 1 root root     29 Mar  3 13:30 zegrep
+  -rwxr-xr-x 1 root root     29 Mar  3 13:30 zfgrep
+  -rwxr-xr-x 1 root root   2081 Mar  3 13:30 zforce
+  -rwxr-xr-x 1 root root   7585 Mar  3 13:30 zgrep
+  -rwxr-xr-x 1 root root   2206 Mar  3 13:30 zless
+  -rwxr-xr-x 1 root root   1842 Mar  3 13:30 zmore
+  -rwxr-xr-x 1 root root   4553 Mar  3 13:30 znew
+I: user script /srv/workspace/pbuilder/7163/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -232,7 +266,7 @@
 Get: 35 http://deb.debian.org/debian bullseye/main armhf golang-src armhf 2:1.15~1 [4856 B]
 Get: 36 http://deb.debian.org/debian bullseye/main armhf golang-go armhf 2:1.15~1 [23.9 kB]
 Get: 37 http://deb.debian.org/debian bullseye/main armhf golang-any armhf 2:1.15~1 [4976 B]
-Fetched 74.7 MB in 43s (1734 kB/s)
+Fetched 74.7 MB in 5s (13.6 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package bsdextrautils.
 (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
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(Reading database ... 60%
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(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19398 files and directories currently installed.)
@@ -395,8 +429,45 @@
 Writing extended state information...
 Building tag database...
  -> Finished parsing the build-deps
+Reading package lists...
+Building dependency tree...
+Reading state information...
+The following additional packages will be installed:
+  libfile-find-rule-perl libnumber-compare-perl libtext-glob-perl
+The following NEW packages will be installed:
+  libfile-find-rule-perl libnumber-compare-perl libtext-glob-perl usrmerge
+0 upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
+Need to get 59.5 kB of archives.
+After this operation, 157 kB of additional disk space will be used.
+Get:1 http://deb.debian.org/debian bullseye/main armhf libnumber-compare-perl all 0.03-1.1 [6956 B]
+Get:2 http://deb.debian.org/debian bullseye/main armhf libtext-glob-perl all 0.11-1 [8888 B]
+Get:3 http://deb.debian.org/debian bullseye/main armhf libfile-find-rule-perl all 0.34-1 [30.6 kB]
+Get:4 http://deb.debian.org/debian bullseye/main armhf usrmerge all 25 [13.0 kB]
+debconf: delaying package configuration, since apt-utils is not installed
+Fetched 59.5 kB in 0s (619 kB/s)
+Selecting previously unselected package libnumber-compare-perl.
+(Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
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(Reading database ... 30%
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(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 31876 files and directories currently installed.)
+Preparing to unpack .../libnumber-compare-perl_0.03-1.1_all.deb ...
+Unpacking libnumber-compare-perl (0.03-1.1) ...
+Selecting previously unselected package libtext-glob-perl.
+Preparing to unpack .../libtext-glob-perl_0.11-1_all.deb ...
+Unpacking libtext-glob-perl (0.11-1) ...
+Selecting previously unselected package libfile-find-rule-perl.
+Preparing to unpack .../libfile-find-rule-perl_0.34-1_all.deb ...
+Unpacking libfile-find-rule-perl (0.34-1) ...
+Selecting previously unselected package usrmerge.
+Preparing to unpack .../archives/usrmerge_25_all.deb ...
+Unpacking usrmerge (25) ...
+Setting up libtext-glob-perl (0.11-1) ...
+Setting up libnumber-compare-perl (0.03-1.1) ...
+Setting up libfile-find-rule-perl (0.34-1) ...
+Setting up usrmerge (25) ...
+The system has been successfully converted.
+Processing triggers for man-db (2.9.4-2) ...
+Not building database; man-db/auto-update is not 'true'.
 I: Building the package
-I: Running cd /build/golang-golang-x-sync-0.0~git20210220.036812b/ && 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-golang-x-sync_0.0~git20210220.036812b-1_source.changes
+hostname: Name or service not known
+I: Running cd /build/golang-golang-x-sync-0.0~git20210220.036812b/ && 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-golang-x-sync_0.0~git20210220.036812b-1_source.changes
 dpkg-buildpackage: info: source package golang-golang-x-sync
 dpkg-buildpackage: info: source version 0.0~git20210220.036812b-1
 dpkg-buildpackage: info: source distribution unstable
@@ -414,22 +485,22 @@
    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 golang.org/x/sync/errgroup golang.org/x/sync/semaphore golang.org/x/sync/singleflight golang.org/x/sync/syncmap
+	cd obj-arm-linux-gnueabihf && go install -trimpath -v -p 4 golang.org/x/sync/errgroup golang.org/x/sync/semaphore golang.org/x/sync/singleflight golang.org/x/sync/syncmap
 internal/unsafeheader
 runtime/internal/sys
 internal/cpu
 internal/race
-runtime/internal/math
 container/list
 sync/atomic
+runtime/internal/math
 internal/bytealg
-runtime/internal/atomic
 unicode
+runtime/internal/atomic
 unicode/utf8
 math/bits
+internal/testlog
 runtime
 math
-internal/testlog
 internal/reflectlite
 sync
 golang.org/x/sync/syncmap
@@ -437,8 +508,8 @@
 sort
 internal/oserror
 io
-syscall
 strconv
+syscall
 bytes
 strings
 reflect
@@ -449,13 +520,13 @@
 internal/poll
 golang.org/x/sync/errgroup
 golang.org/x/sync/semaphore
+internal/fmtsort
 os
 runtime/debug
-internal/fmtsort
 fmt
 golang.org/x/sync/singleflight
    dh_auto_test -O--buildsystem=golang
-	cd obj-arm-linux-gnueabihf && go test -vet=off -v -p 3 golang.org/x/sync/errgroup golang.org/x/sync/semaphore golang.org/x/sync/singleflight golang.org/x/sync/syncmap
+	cd obj-arm-linux-gnueabihf && go test -vet=off -v -p 4 golang.org/x/sync/errgroup golang.org/x/sync/semaphore golang.org/x/sync/singleflight golang.org/x/sync/syncmap
 === RUN   TestZeroGroup
 --- PASS: TestZeroGroup (0.00s)
 === RUN   TestWithContext
@@ -463,7 +534,7 @@
 === RUN   ExampleGroup_parallel
 --- PASS: ExampleGroup_parallel (0.00s)
 PASS
-ok  	golang.org/x/sync/errgroup	0.014s
+ok  	golang.org/x/sync/errgroup	0.020s
 === RUN   TestWeighted
 === PAUSE TestWeighted
 === RUN   TestWeightedPanic
@@ -479,8 +550,8 @@
 === RUN   TestAllocCancelDoesntStarve
 --- PASS: TestAllocCancelDoesntStarve (0.00s)
 === CONT  TestWeighted
-=== CONT  TestWeightedDoesntBlockIfTooBig
 === CONT  TestLargeAcquireDoesntStarve
+=== CONT  TestWeightedDoesntBlockIfTooBig
 === CONT  TestWeightedAcquire
 --- PASS: TestLargeAcquireDoesntStarve (0.00s)
 === CONT  TestWeightedTryAcquire
@@ -489,11 +560,11 @@
 --- PASS: TestWeightedPanic (0.00s)
 --- PASS: TestWeightedDoesntBlockIfTooBig (0.00s)
 --- PASS: TestWeightedAcquire (0.02s)
---- PASS: TestWeighted (4.32s)
+--- PASS: TestWeighted (5.51s)
 === RUN   Example_workerPool
 --- PASS: Example_workerPool (0.00s)
 PASS
-ok  	golang.org/x/sync/semaphore	4.328s
+ok  	golang.org/x/sync/semaphore	5.531s
 === RUN   TestDo
 --- PASS: TestDo (0.00s)
 === RUN   TestDoErr
@@ -511,37 +582,37 @@
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
         golang.org/x/sync/singleflight.newPanicError(0x1303e8, 0x172798, 0x172798, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:35 +0x14
-        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x1c3074c, 0x1d14090)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x19aff4c, 0x19a6090)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:188 +0x4c
         panic(0x1303e8, 0x172798)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.TestPanicDo.func1(0x1c, 0x6, 0x6c, 0xf7e53ab4)
+        golang.org/x/sync/singleflight.TestPanicDo.func1(0x1c, 0x6, 0x6c, 0xb6f7d750)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:160 +0x24
-        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x1c3074c, 0x1d14090, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x19aff4c, 0x19a6090, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:193 +0x54
-        golang.org/x/sync/singleflight.(*Group).doCall(0x1d10020, 0x1d14090, 0x14a695, 0x3, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall(0x19a2020, 0x19a6090, 0x14a695, 0x3, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:195 +0x84
-        golang.org/x/sync/singleflight.(*Group).Do(0x1d10020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
+        golang.org/x/sync/singleflight.(*Group).Do(0x19a2020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
-        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0, 0x1d10020, 0x154c90)
+        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1982460, 0x1994068, 0x1994064, 0x199c2c0, 0x19a2020, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:180 +0x78
         created by golang.org/x/sync/singleflight.TestPanicDo
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:168 +0xbc
         
         goroutine 43 [running]:
-        runtime/debug.Stack(0x1c30608, 0x131d78, 0x1d120e0)
+        runtime/debug.Stack(0x19afe08, 0x131d78, 0x19a40e0)
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
-        golang.org/x/sync/singleflight.TestPanicDo.func2.1(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0)
+        golang.org/x/sync/singleflight.TestPanicDo.func2.1(0x1982460, 0x1994068, 0x1994064, 0x199c2c0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:171 +0x6c
-        panic(0x131d78, 0x1d120e0)
+        panic(0x131d78, 0x19a40e0)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.(*Group).doCall.func1(0x1c3074c, 0x1c30748, 0x1d14090, 0x1d10020, 0x14a695, 0x3)
+        golang.org/x/sync/singleflight.(*Group).doCall.func1(0x19aff4c, 0x19aff48, 0x19a6090, 0x19a2020, 0x14a695, 0x3)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:165 +0x224
-        golang.org/x/sync/singleflight.(*Group).doCall(0x1d10020, 0x1d14090, 0x14a695, 0x3, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall(0x19a2020, 0x19a6090, 0x14a695, 0x3, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:200 +0xcc
-        golang.org/x/sync/singleflight.(*Group).Do(0x1d10020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
+        golang.org/x/sync/singleflight.(*Group).Do(0x19a2020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
-        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0, 0x1d10020, 0x154c90)
+        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1982460, 0x1994068, 0x1994064, 0x199c2c0, 0x19a2020, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:180 +0x78
         created by golang.org/x/sync/singleflight.TestPanicDo
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:168 +0xbc
@@ -551,37 +622,37 @@
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
         golang.org/x/sync/singleflight.newPanicError(0x1303e8, 0x172798, 0x172798, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:35 +0x14
-        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x1c31f4c, 0x1d140f0)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x19ae74c, 0x19a60f0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:188 +0x4c
         panic(0x1303e8, 0x172798)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.TestPanicDo.func1(0x3, 0x0, 0x0, 0xf7e60eb8)
+        golang.org/x/sync/singleflight.TestPanicDo.func1(0x3, 0x0, 0x0, 0xb6f8adc8)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:160 +0x24
-        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x1c31f4c, 0x1d140f0, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x19ae74c, 0x19a60f0, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:193 +0x54
-        golang.org/x/sync/singleflight.(*Group).doCall(0x1d10020, 0x1d140f0, 0x14a695, 0x3, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall(0x19a2020, 0x19a60f0, 0x14a695, 0x3, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:195 +0x84
-        golang.org/x/sync/singleflight.(*Group).Do(0x1d10020, 0x14a695, 0x3, 0x154c90, 0x3, 0x0, 0x1, 0x0, 0x1d10010)
+        golang.org/x/sync/singleflight.(*Group).Do(0x19a2020, 0x14a695, 0x3, 0x154c90, 0x3, 0x0, 0x1, 0x0, 0x19a2010)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
-        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0, 0x1d10020, 0x154c90)
+        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1982460, 0x1994068, 0x1994064, 0x199c2c0, 0x19a2020, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:180 +0x78
         created by golang.org/x/sync/singleflight.TestPanicDo
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:168 +0xbc
         
         goroutine 39 [running]:
-        runtime/debug.Stack(0x1c31e08, 0x131d78, 0x1d12120)
+        runtime/debug.Stack(0x19ae608, 0x131d78, 0x19a4120)
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
-        golang.org/x/sync/singleflight.TestPanicDo.func2.1(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0)
+        golang.org/x/sync/singleflight.TestPanicDo.func2.1(0x1982460, 0x1994068, 0x1994064, 0x199c2c0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:171 +0x6c
-        panic(0x131d78, 0x1d12120)
+        panic(0x131d78, 0x19a4120)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.(*Group).doCall.func1(0x1c31f4c, 0x1c31f48, 0x1d140f0, 0x1d10020, 0x14a695, 0x3)
+        golang.org/x/sync/singleflight.(*Group).doCall.func1(0x19ae74c, 0x19ae748, 0x19a60f0, 0x19a2020, 0x14a695, 0x3)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:165 +0x224
-        golang.org/x/sync/singleflight.(*Group).doCall(0x1d10020, 0x1d140f0, 0x14a695, 0x3, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall(0x19a2020, 0x19a60f0, 0x14a695, 0x3, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:200 +0xcc
-        golang.org/x/sync/singleflight.(*Group).Do(0x1d10020, 0x14a695, 0x3, 0x154c90, 0x3, 0x0, 0x1, 0x0, 0x1d10010)
+        golang.org/x/sync/singleflight.(*Group).Do(0x19a2020, 0x14a695, 0x3, 0x154c90, 0x3, 0x0, 0x1, 0x0, 0x19a2010)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
-        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0, 0x1d10020, 0x154c90)
+        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1982460, 0x1994068, 0x1994064, 0x199c2c0, 0x19a2020, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:180 +0x78
         created by golang.org/x/sync/singleflight.TestPanicDo
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:168 +0xbc
@@ -589,35 +660,39 @@
         
         runtime/debug.Stack(0x0, 0x0, 0x0)
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
-        golang.org/x/sync/singleflight.newPanicError(0x1303e8, 0x172798, 0x172798, 0x0)
+        golang.org/x/sync/singleflight.newPanicError(0x1303e8, 0x172798, 0x172798, 0x800)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:35 +0x14
-        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x1c3174c, 0x1cb2120)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x183574c, 0x19a6120)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:188 +0x4c
         panic(0x1303e8, 0x172798)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.TestPanicDo.func1(0x0, 0x0, 0x0, 0xf7e5f7e8)
+        golang.org/x/sync/singleflight.TestPanicDo.func1(0x0, 0x199c100, 0x199c100, 0xb6f8adc8)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:160 +0x24
-        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x1c3174c, 0x1cb2120, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x183574c, 0x19a6120, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:193 +0x54
-        golang.org/x/sync/singleflight.(*Group).doCall(0x1d10020, 0x1cb2120, 0x14a695, 0x3, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall(0x19a2020, 0x19a6120, 0x14a695, 0x3, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:195 +0x84
-        golang.org/x/sync/singleflight.(*Group).Do(0x1d10020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
+        golang.org/x/sync/singleflight.(*Group).Do(0x19a2020, 0x14a695, 0x3, 0x154c90, 0x19a2000, 0x14a695, 0x3, 0x18357cc, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
-        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0, 0x1d10020, 0x154c90)
+        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1982460, 0x1994068, 0x1994064, 0x199c2c0, 0x19a2020, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:180 +0x78
         created by golang.org/x/sync/singleflight.TestPanicDo
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:168 +0xbc
         
-        goroutine 42 [running]:
-        runtime/debug.Stack(0x1c30e8c, 0x131d78, 0x1c9a560)
+        goroutine 40 [running]:
+        runtime/debug.Stack(0x1835608, 0x131d78, 0x19a4140)
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
-        golang.org/x/sync/singleflight.TestPanicDo.func2.1(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0)
+        golang.org/x/sync/singleflight.TestPanicDo.func2.1(0x1982460, 0x1994068, 0x1994064, 0x199c2c0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:171 +0x6c
-        panic(0x131d78, 0x1c9a560)
+        panic(0x131d78, 0x19a4140)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.(*Group).Do(0x1d10020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
-        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:97 +0x1a4
-        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0, 0x1d10020, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall.func1(0x183574c, 0x1835748, 0x19a6120, 0x19a2020, 0x14a695, 0x3)
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:165 +0x224
+        golang.org/x/sync/singleflight.(*Group).doCall(0x19a2020, 0x19a6120, 0x14a695, 0x3, 0x154c90)
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:200 +0xcc
+        golang.org/x/sync/singleflight.(*Group).Do(0x19a2020, 0x14a695, 0x3, 0x154c90, 0x19a2000, 0x14a695, 0x3, 0x18357cc, 0x0)
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
+        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1982460, 0x1994068, 0x1994064, 0x199c2c0, 0x19a2020, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:180 +0x78
         created by golang.org/x/sync/singleflight.TestPanicDo
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:168 +0xbc
@@ -627,37 +702,37 @@
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
         golang.org/x/sync/singleflight.newPanicError(0x1303e8, 0x172798, 0x172798, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:35 +0x14
-        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x1c3174c, 0x1cb2120)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x19aef4c, 0x19a6150)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:188 +0x4c
         panic(0x1303e8, 0x172798)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.TestPanicDo.func1(0x0, 0x0, 0x0, 0xf7e5f7e8)
+        golang.org/x/sync/singleflight.TestPanicDo.func1(0x0, 0x0, 0x0, 0xb6f8adc8)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:160 +0x24
-        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x1c3174c, 0x1cb2120, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x19aef4c, 0x19a6150, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:193 +0x54
-        golang.org/x/sync/singleflight.(*Group).doCall(0x1d10020, 0x1cb2120, 0x14a695, 0x3, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall(0x19a2020, 0x19a6150, 0x14a695, 0x3, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:195 +0x84
-        golang.org/x/sync/singleflight.(*Group).Do(0x1d10020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
+        golang.org/x/sync/singleflight.(*Group).Do(0x19a2020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
-        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0, 0x1d10020, 0x154c90)
+        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1982460, 0x1994068, 0x1994064, 0x199c2c0, 0x19a2020, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:180 +0x78
         created by golang.org/x/sync/singleflight.TestPanicDo
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:168 +0xbc
         
         goroutine 41 [running]:
-        runtime/debug.Stack(0x1c31608, 0x131d78, 0x1c9a560)
+        runtime/debug.Stack(0x19aee08, 0x131d78, 0x19a4160)
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
-        golang.org/x/sync/singleflight.TestPanicDo.func2.1(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0)
+        golang.org/x/sync/singleflight.TestPanicDo.func2.1(0x1982460, 0x1994068, 0x1994064, 0x199c2c0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:171 +0x6c
-        panic(0x131d78, 0x1c9a560)
+        panic(0x131d78, 0x19a4160)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.(*Group).doCall.func1(0x1c3174c, 0x1c31748, 0x1cb2120, 0x1d10020, 0x14a695, 0x3)
+        golang.org/x/sync/singleflight.(*Group).doCall.func1(0x19aef4c, 0x19aef48, 0x19a6150, 0x19a2020, 0x14a695, 0x3)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:165 +0x224
-        golang.org/x/sync/singleflight.(*Group).doCall(0x1d10020, 0x1cb2120, 0x14a695, 0x3, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall(0x19a2020, 0x19a6150, 0x14a695, 0x3, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:200 +0xcc
-        golang.org/x/sync/singleflight.(*Group).Do(0x1d10020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
+        golang.org/x/sync/singleflight.(*Group).Do(0x19a2020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
-        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0, 0x1d10020, 0x154c90)
+        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1982460, 0x1994068, 0x1994064, 0x199c2c0, 0x19a2020, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:180 +0x78
         created by golang.org/x/sync/singleflight.TestPanicDo
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:168 +0xbc
@@ -667,33 +742,37 @@
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
         golang.org/x/sync/singleflight.newPanicError(0x1303e8, 0x172798, 0x172798, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:35 +0x14
-        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x1c3174c, 0x1cb2120)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x19af74c, 0x19a6180)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:188 +0x4c
         panic(0x1303e8, 0x172798)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.TestPanicDo.func1(0x0, 0x0, 0x0, 0xf7e5f7e8)
+        golang.org/x/sync/singleflight.TestPanicDo.func1(0x0, 0x0, 0x0, 0xb6f8adc8)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:160 +0x24
-        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x1c3174c, 0x1cb2120, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x19af74c, 0x19a6180, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:193 +0x54
-        golang.org/x/sync/singleflight.(*Group).doCall(0x1d10020, 0x1cb2120, 0x14a695, 0x3, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall(0x19a2020, 0x19a6180, 0x14a695, 0x3, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:195 +0x84
-        golang.org/x/sync/singleflight.(*Group).Do(0x1d10020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
+        golang.org/x/sync/singleflight.(*Group).Do(0x19a2020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
-        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0, 0x1d10020, 0x154c90)
+        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1982460, 0x1994068, 0x1994064, 0x199c2c0, 0x19a2020, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:180 +0x78
         created by golang.org/x/sync/singleflight.TestPanicDo
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:168 +0xbc
         
-        goroutine 40 [running]:
-        runtime/debug.Stack(0x1cdc68c, 0x131d78, 0x1c9a560)
+        goroutine 42 [running]:
+        runtime/debug.Stack(0x19af608, 0x131d78, 0x19a4180)
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
-        golang.org/x/sync/singleflight.TestPanicDo.func2.1(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0)
+        golang.org/x/sync/singleflight.TestPanicDo.func2.1(0x1982460, 0x1994068, 0x1994064, 0x199c2c0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:171 +0x6c
-        panic(0x131d78, 0x1c9a560)
+        panic(0x131d78, 0x19a4180)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.(*Group).Do(0x1d10020, 0x14a695, 0x3, 0x154c90, 0x1d10000, 0x14a695, 0x3, 0x1cdc7cc, 0x0)
-        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:97 +0x1a4
-        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1d0c1c0, 0x1d02068, 0x1d02064, 0x1d082c0, 0x1d10020, 0x154c90)
+        golang.org/x/sync/singleflight.(*Group).doCall.func1(0x19af74c, 0x19af748, 0x19a6180, 0x19a2020, 0x14a695, 0x3)
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:165 +0x224
+        golang.org/x/sync/singleflight.(*Group).doCall(0x19a2020, 0x19a6180, 0x14a695, 0x3, 0x154c90)
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:200 +0xcc
+        golang.org/x/sync/singleflight.(*Group).Do(0x19a2020, 0x14a695, 0x3, 0x154c90, 0x0, 0x0, 0x0, 0x0, 0x0)
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
+        golang.org/x/sync/singleflight.TestPanicDo.func2(0x1982460, 0x1994068, 0x1994064, 0x199c2c0, 0x19a2020, 0x154c90)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:180 +0x78
         created by golang.org/x/sync/singleflight.TestPanicDo
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:168 +0xbc
@@ -706,82 +785,81 @@
 === PAUSE TestPanicDoSharedByDoChan
 === CONT  TestPanicDoChan
 === CONT  TestPanicDoSharedByDoChan
-=== CONT  TestPanicDoChan
-    singleflight_test.go:256: /tmp/go-build895660844/b122/singleflight.test -test.run=TestPanicDoChan -test.v:
-        === RUN   TestPanicDoChan
-        panic: Panicking in DoChan
+    singleflight_test.go:310: /tmp/go-build118256853/b122/singleflight.test -test.run=TestPanicDoSharedByDoChan -test.v:
+        === RUN   TestPanicDoSharedByDoChan
+        panic: Panicking in Do
         
-        runtime/debug.Stack(0x0, 0x0, 0x0)
+        runtime/debug.Stack(0x170da0, 0xa6d04220, 0x0)
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
-        golang.org/x/sync/singleflight.newPanicError(0x1303e8, 0x1727a0, 0x1727a0, 0x0)
+        golang.org/x/sync/singleflight.newPanicError(0x1303e8, 0x172770, 0x172770, 0x38)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:35 +0x14
-        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x1918fb0, 0x19280c0)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x834f58, 0x85c0f0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:188 +0x4c
-        panic(0x1303e8, 0x1727a0)
+        panic(0x1303e8, 0x172770)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.TestPanicDoChan.func2(0x0, 0x0, 0x0, 0x0)
-        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:238 +0x24
-        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x1918fb0, 0x19280c0, 0x154ca0)
+        golang.org/x/sync/singleflight.TestPanicDoSharedByDoChan.func1.2(0x1c, 0x18, 0x6c, 0xb6f33088)
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:285 +0x4c
+        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x834f58, 0x85c0f0, 0x834fcc)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:193 +0x54
-        golang.org/x/sync/singleflight.(*Group).doCall(0x1924030, 0x19280c0, 0x0, 0x0, 0x154ca0)
+        golang.org/x/sync/singleflight.(*Group).doCall(0x80c060, 0x85c0f0, 0x0, 0x0, 0x834fcc)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:195 +0x84
-        created by golang.org/x/sync/singleflight.(*Group).DoChan
-        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:133 +0x25c
+        golang.org/x/sync/singleflight.(*Group).Do(0x80c060, 0x0, 0x0, 0x834fcc, 0x0, 0x0, 0x0, 0x0, 0x0)
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
+        golang.org/x/sync/singleflight.TestPanicDoSharedByDoChan.func1(0x80c060, 0x850240, 0x850280)
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:282 +0x80
+        created by golang.org/x/sync/singleflight.TestPanicDoSharedByDoChan
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:278 +0x54c
         
         
-        goroutine 36 [running]:
-        panic(0x131d78, 0x1906580)
+        goroutine 8 [running]:
+        panic(0x131d78, 0x80a5c0)
         	/usr/lib/go-1.15/src/runtime/panic.go:1064 +0x578
         runtime.goexit()
         	/usr/lib/go-1.15/src/runtime/asm_arm.s:857 +0x4
         created by golang.org/x/sync/singleflight.(*Group).doCall.func1
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:162 +0x244
---- PASS: TestPanicDoChan (0.01s)
-=== CONT  TestPanicDoSharedByDoChan
-    singleflight_test.go:310: /tmp/go-build895660844/b122/singleflight.test -test.run=TestPanicDoSharedByDoChan -test.v:
-        === RUN   TestPanicDoSharedByDoChan
-        panic: Panicking in Do
+--- PASS: TestPanicDoSharedByDoChan (0.04s)
+=== CONT  TestPanicDoChan
+    singleflight_test.go:256: /tmp/go-build118256853/b122/singleflight.test -test.run=TestPanicDoChan -test.v:
+        === RUN   TestPanicDoChan
+        panic: Panicking in DoChan
         
-        runtime/debug.Stack(0x170da0, 0xe7c6b220, 0x0)
+        runtime/debug.Stack(0x0, 0x0, 0x0)
         	/usr/lib/go-1.15/src/runtime/debug/stack.go:24 +0x78
-        golang.org/x/sync/singleflight.newPanicError(0x1303e8, 0x172770, 0x172770, 0x38)
+        golang.org/x/sync/singleflight.newPanicError(0x1303e8, 0x1727a0, 0x1727a0, 0x0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:35 +0x14
-        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x2034f58, 0x205c0f0)
+        golang.org/x/sync/singleflight.(*Group).doCall.func2.1(0x1c34fb0, 0x1c5c0f0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:188 +0x4c
-        panic(0x1303e8, 0x172770)
+        panic(0x1303e8, 0x1727a0)
         	/usr/lib/go-1.15/src/runtime/panic.go:969 +0x158
-        golang.org/x/sync/singleflight.TestPanicDoSharedByDoChan.func1.2(0x1c, 0x15, 0x6c, 0xf7e9a088)
-        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:285 +0x4c
-        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x2034f58, 0x205c0f0, 0x2034fcc)
+        golang.org/x/sync/singleflight.TestPanicDoChan.func2(0x0, 0x0, 0x0, 0x0)
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:238 +0x24
+        golang.org/x/sync/singleflight.(*Group).doCall.func2(0x1c34fb0, 0x1c5c0f0, 0x154ca0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:193 +0x54
-        golang.org/x/sync/singleflight.(*Group).doCall(0x200c060, 0x205c0f0, 0x0, 0x0, 0x2034fcc)
+        golang.org/x/sync/singleflight.(*Group).doCall(0x1c0c060, 0x1c5c0f0, 0x0, 0x0, 0x154ca0)
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:195 +0x84
-        golang.org/x/sync/singleflight.(*Group).Do(0x200c060, 0x0, 0x0, 0x2034fcc, 0x0, 0x0, 0x0, 0x0, 0x0)
-        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:108 +0x10c
-        golang.org/x/sync/singleflight.TestPanicDoSharedByDoChan.func1(0x200c060, 0x2050240, 0x2050280)
-        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:282 +0x80
-        created by golang.org/x/sync/singleflight.TestPanicDoSharedByDoChan
-        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight_test.go:278 +0x54c
+        created by golang.org/x/sync/singleflight.(*Group).DoChan
+        	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:133 +0x25c
         
         
         goroutine 8 [running]:
-        panic(0x131d78, 0x200a5c0)
+        panic(0x131d78, 0x1c0a5c0)
         	/usr/lib/go-1.15/src/runtime/panic.go:1064 +0x578
         runtime.goexit()
         	/usr/lib/go-1.15/src/runtime/asm_arm.s:857 +0x4
         created by golang.org/x/sync/singleflight.(*Group).doCall.func1
         	/build/golang-golang-x-sync-0.0~git20210220.036812b/obj-arm-linux-gnueabihf/src/golang.org/x/sync/singleflight/singleflight.go:162 +0x244
---- PASS: TestPanicDoSharedByDoChan (0.01s)
+--- PASS: TestPanicDoChan (0.05s)
 PASS
-ok  	golang.org/x/sync/singleflight	0.034s
+ok  	golang.org/x/sync/singleflight	0.092s
 === RUN   TestMapMatchesRWMutex
---- PASS: TestMapMatchesRWMutex (0.02s)
+--- PASS: TestMapMatchesRWMutex (0.03s)
 === RUN   TestMapMatchesDeepCopy
---- PASS: TestMapMatchesDeepCopy (0.02s)
+--- PASS: TestMapMatchesDeepCopy (0.03s)
 === RUN   TestConcurrentRange
---- PASS: TestConcurrentRange (0.66s)
+--- PASS: TestConcurrentRange (1.18s)
 PASS
-ok  	golang.org/x/sync/syncmap	0.706s
+ok  	golang.org/x/sync/syncmap	1.272s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=golang
    dh_prep -O--buildsystem=golang
@@ -809,12 +887,14 @@
 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/7163/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/7163/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/3429 and its subdirectories
-I: Current time: Mon Aug  2 08:54:25 -12 2021
-I: pbuilder-time-stamp: 1627937665
+I: removing directory /srv/workspace/pbuilder/7163 and its subdirectories
+I: Current time: Tue Aug  3 10:56:24 +14 2021
+I: pbuilder-time-stamp: 1627937784