Diff of the two buildlogs:

--
--- b1/build.log	2020-04-19 21:55:15.479185993 +0000
+++ b2/build.log	2020-04-19 21:55:48.918534362 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Apr 19 09:51:24 -12 2020
-I: pbuilder-time-stamp: 1587333084
+I: Current time: Sun May 23 18:18:16 +14 2021
+I: pbuilder-time-stamp: 1621743496
 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 Fri Dec  7 20:51:15 2018 -12
+gpgv: Signature made Sat Dec  8 22:51:15 2018 +14
 gpgv:                using RSA key 8F19CADCD42A42D45563730C51A09B18CF5A5068
 gpgv:                issuer "vseva@debian.org"
 gpgv: Can't check signature: No public key
@@ -28,6 +28,18 @@
 dpkg-source: info: unpacking golang-github-go-sql-driver-mysql_1.4.1-1.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
+I: user script /srv/workspace/pbuilder/31397/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/31397/tmp/hooks/D01_modify_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -106,7 +118,7 @@
 Get: 37 http://deb.debian.org/debian buster/main i386 golang-src i386 2:1.11~1 [4348 B]
 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]
-Fetched 74.2 MB in 5s (14.7 MB/s)
+Fetched 74.2 MB in 1s (85.6 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libbsd0:i386.
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(Reading database ... 19231 files and directories currently installed.)
@@ -285,7 +297,7 @@
 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-go-sql-driver-mysql-1.4.1/ && 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-go-sql-driver-mysql-1.4.1/ && 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-go-sql-driver-mysql
 dpkg-buildpackage: info: source version 1.4.1-1
 dpkg-buildpackage: info: source distribution unstable
@@ -303,85 +315,85 @@
    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-go-sql-driver-mysql-1.4.1/obj-i686-linux-gnu/src\" -asmflags=all=\"-trimpath=/build/golang-github-go-sql-driver-mysql-1.4.1/obj-i686-linux-gnu/src\" -v -p 10 github.com/go-sql-driver/mysql
-math/bits
+	cd obj-i686-linux-gnu && go install -gcflags=all=\"-trimpath=/build/golang-github-go-sql-driver-mysql-1.4.1/obj-i686-linux-gnu/src\" -asmflags=all=\"-trimpath=/build/golang-github-go-sql-driver-mysql-1.4.1/obj-i686-linux-gnu/src\" -v -p 18 github.com/go-sql-driver/mysql
 errors
-runtime/internal/atomic
-runtime/internal/sys
 unicode/utf8
-sync/atomic
+internal/nettrace
+math/bits
 internal/race
-math
-crypto/internal/subtle
-internal/cpu
-unicode
-crypto/subtle
 container/list
+crypto/internal/subtle
 vendor/golang_org/x/crypto/cryptobyte/asn1
+crypto/subtle
 vendor/golang_org/x/net/dns/dnsmessage
-internal/nettrace
+internal/cpu
+sync/atomic
+runtime/internal/sys
+runtime/cgo
+runtime/internal/atomic
+unicode
+math
 internal/testlog
 internal/bytealg
-runtime/cgo
 runtime
 strconv
 crypto/rc4
 sync
-math/rand
 io
 internal/singleflight
+math/rand
 reflect
 syscall
-crypto/cipher
-bytes
 crypto/internal/randutil
 hash
+crypto/cipher
+bytes
 strings
-crypto
 crypto/hmac
-crypto/sha1
+crypto
 crypto/sha256
+crypto/sha1
 crypto/sha512
 crypto/md5
 crypto/aes
 bufio
 internal/syscall/unix
 time
-sort
-encoding/binary
 internal/poll
-encoding/base64
-crypto/des
-vendor/golang_org/x/crypto/poly1305
+encoding/binary
+sort
 os
 vendor/golang_org/x/crypto/internal/chacha20
+vendor/golang_org/x/crypto/poly1305
+encoding/base64
 vendor/golang_org/x/crypto/curve25519
-encoding/pem
+crypto/des
 vendor/golang_org/x/crypto/chacha20poly1305
+encoding/pem
 path/filepath
 fmt
 io/ioutil
 context
 encoding/hex
-log
 net/url
+log
 math/big
 database/sql/driver
 net
 database/sql
+crypto/rand
 crypto/dsa
-encoding/asn1
 crypto/elliptic
-crypto/rand
+encoding/asn1
 crypto/rsa
+crypto/ecdsa
 crypto/x509/pkix
 vendor/golang_org/x/crypto/cryptobyte
-crypto/ecdsa
 crypto/x509
 crypto/tls
 github.com/go-sql-driver/mysql
    dh_auto_test -O--buildsystem=golang
-	cd obj-i686-linux-gnu && go test -vet=off -v -p 10 github.com/go-sql-driver/mysql
+	cd obj-i686-linux-gnu && go test -vet=off -v -p 18 github.com/go-sql-driver/mysql
 === RUN   TestScrambleOldPass
 --- PASS: TestScrambleOldPass (0.00s)
 === RUN   TestScrambleSHA256Pass
@@ -637,7 +649,7 @@
 === RUN   TestDSNParserInvalid
 --- PASS: TestDSNParserInvalid (0.00s)
 === RUN   TestDSNReformat
---- PASS: TestDSNReformat (0.01s)
+--- PASS: TestDSNReformat (0.00s)
 === RUN   TestDSNServerPubKey
 --- PASS: TestDSNServerPubKey (0.00s)
 === RUN   TestDSNServerPubKeyQueryEscape
@@ -662,11 +674,11 @@
 === RUN   TestReadPacketWrongSequenceID
 --- PASS: TestReadPacketWrongSequenceID (0.00s)
 === RUN   TestReadPacketSplit
---- PASS: TestReadPacketSplit (0.37s)
+--- PASS: TestReadPacketSplit (0.05s)
 === RUN   TestReadPacketFail
-[mysql] 2020/04/19 21:54:51 packets.go:58: malformed packet
-[mysql] 2020/04/19 21:54:51 packets.go:36: connection is closed
-[mysql] 2020/04/19 21:54:51 packets.go:36: too many reads
+[mysql] 2021/05/23 04:18:44 packets.go:58: malformed packet
+[mysql] 2021/05/23 04:18:44 packets.go:36: connection is closed
+[mysql] 2021/05/23 04:18:44 packets.go:36: too many reads
 --- PASS: TestReadPacketFail (0.00s)
 === RUN   TestRegression801
 --- PASS: TestRegression801 (0.00s)
@@ -703,7 +715,7 @@
 === RUN   TestAtomicError
 --- PASS: TestAtomicError (0.00s)
 PASS
-ok  	github.com/go-sql-driver/mysql	0.424s
+ok  	github.com/go-sql-driver/mysql	0.067s
    create-stamp debian/debhelper-build-stamp
  fakeroot debian/rules binary
 dh binary --buildsystem=golang --with=golang
@@ -733,12 +745,14 @@
  dpkg-source --after-build .
 dpkg-buildpackage: info: binary-only upload (no source included)
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/31397/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/31397/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/23186 and its subdirectories
-I: Current time: Sun Apr 19 09:55:14 -12 2020
-I: pbuilder-time-stamp: 1587333314
+I: removing directory /srv/workspace/pbuilder/31397 and its subdirectories
+I: Current time: Sun May 23 18:18:47 +14 2021
+I: pbuilder-time-stamp: 1621743527