21 files changed, 101 insertions, 100 deletions
diff --git a/ci/lint/04_install.sh b/ci/lint/04_install.sh
index 8b2d609504..26b576c1ae 100755
--- a/ci/lint/04_install.sh
+++ b/ci/lint/04_install.sh
@@ -9,6 +9,7 @@ export LC_ALL=C
 travis_retry pip3 install codespell==1.15.0
 travis_retry pip3 install flake8==3.7.8
 travis_retry pip3 install yq
+travis_retry pip3 install mypy==0.700
 
 SHELLCHECK_VERSION=v0.6.0
 curl -s "https://storage.googleapis.com/shellcheck/shellcheck-${SHELLCHECK_VERSION}.linux.x86_64.tar.xz" | tar --xz -xf - --directory /tmp/
diff --git a/ci/test/00_setup_env.sh b/ci/test/00_setup_env.sh
index 4c22e4e6c5..56b8fc976e 100755
--- a/ci/test/00_setup_env.sh
+++ b/ci/test/00_setup_env.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -8,7 +8,7 @@ export LC_ALL=C.UTF-8
 
 # The root dir.
 # The ci system copies this folder.
-# This is where the build is done (depends and dist).
+# This is where the depends build is done.
 BASE_ROOT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )"/../../ >/dev/null 2>&1 && pwd )
 export BASE_ROOT_DIR
 
@@ -24,7 +24,7 @@ echo "Fallback to default values in env (if not yet set)"
 export MAKEJOBS=${MAKEJOBS:--j4}
 # A folder for the ci system to put temporary files (ccache, datadirs for tests, ...)
 # This folder only exists on the ci host.
-export BASE_SCRATCH_DIR=${BASE_SCRATCH_DIR:-$BASE_ROOT_DIR/ci/scratch/}
+export BASE_SCRATCH_DIR=${BASE_SCRATCH_DIR:-$BASE_ROOT_DIR/ci/scratch}
 # What host to compile for. See also ./depends/README.md
 # Tests that need cross-compilation export the appropriate HOST.
 # Tests that run natively guess the host
@@ -33,13 +33,15 @@ export HOST=${HOST:-$("$BASE_ROOT_DIR/depends/config.guess")}
 export USE_BUSY_BOX=${USE_BUSY_BOX:-false}
 export RUN_UNIT_TESTS=${RUN_UNIT_TESTS:-true}
 export RUN_FUNCTIONAL_TESTS=${RUN_FUNCTIONAL_TESTS:-true}
-export TEST_PREVIOUS_RELEASES=${TEST_PREVIOUS_RELEASES:-false}
+export TEST_RUNNER_ENV=${TEST_RUNNER_ENV:-}
 export RUN_FUZZ_TESTS=${RUN_FUZZ_TESTS:-false}
 export CONTAINER_NAME=${CONTAINER_NAME:-ci_unnamed}
 export DOCKER_NAME_TAG=${DOCKER_NAME_TAG:-ubuntu:18.04}
 # Randomize test order.
 # See https://www.boost.org/doc/libs/1_71_0/libs/test/doc/html/boost_test/utf_reference/rt_param_reference/random.html
 export BOOST_TEST_RANDOM=${BOOST_TEST_RANDOM:-1}
+# See man 7 debconf
+export DEBIAN_FRONTEND=noninteractive
 export CCACHE_SIZE=${CCACHE_SIZE:-100M}
 export CCACHE_TEMPDIR=${CCACHE_TEMPDIR:-/tmp/.ccache-temp}
 export CCACHE_COMPRESS=${CCACHE_COMPRESS:-1}
@@ -49,13 +51,14 @@ export CCACHE_DIR=${CCACHE_DIR:-$BASE_SCRATCH_DIR/.ccache}
 # The depends dir.
 # This folder exists on the ci host and ci guest. Changes are propagated back and forth.
 export DEPENDS_DIR=${DEPENDS_DIR:-$BASE_ROOT_DIR/depends}
-# Folder where the build is done (bin and lib).
+# Folder where the build result is put (bin and lib).
 export BASE_OUTDIR=${BASE_OUTDIR:-$BASE_SCRATCH_DIR/out/$HOST}
+# Folder where the build is done (dist and out-of-tree build).
+export BASE_BUILD_DIR=${BASE_BUILD_DIR:-$BASE_SCRATCH_DIR/build}
 export PREVIOUS_RELEASES_DIR=${PREVIOUS_RELEASES_DIR:-$BASE_ROOT_DIR/releases/$HOST}
 export SDK_URL=${SDK_URL:-https://bitcoincore.org/depends-sources/sdks}
-export WINEDEBUG=${WINEDEBUG:-fixme-all}
 export DOCKER_PACKAGES=${DOCKER_PACKAGES:-build-essential libtool autotools-dev automake pkg-config bsdmainutils curl ca-certificates ccache python3 rsync git procps}
 export GOAL=${GOAL:-install}
 export DIR_QA_ASSETS=${DIR_QA_ASSETS:-${BASE_SCRATCH_DIR}/qa-assets}
 export PATH=${BASE_ROOT_DIR}/ci/retry:$PATH
-export CI_RETRY_EXE=${CI_RETRY_EXE:retry}
+export CI_RETRY_EXE=${CI_RETRY_EXE:-"retry --"}
diff --git a/ci/test/00_setup_env_arm.sh b/ci/test/00_setup_env_arm.sh
index 2b30b4a5e3..b70a581532 100644
--- a/ci/test/00_setup_env_arm.sh
+++ b/ci/test/00_setup_env_arm.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/ci/test/00_setup_env_mac.sh b/ci/test/00_setup_env_mac.sh
index 6ed6e40bd6..a4dc54d1c1 100644
--- a/ci/test/00_setup_env_mac.sh
+++ b/ci/test/00_setup_env_mac.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/ci/test/00_setup_env_mac_host.sh b/ci/test/00_setup_env_mac_host.sh
index 0b437a723f..982e38daee 100644
--- a/ci/test/00_setup_env_mac_host.sh
+++ b/ci/test/00_setup_env_mac_host.sh
@@ -1,19 +1,16 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 export LC_ALL=C.UTF-8
 
 export HOST=x86_64-apple-darwin16
-export BREW_PACKAGES="automake berkeley-db4 libtool boost miniupnpc pkg-config qt qrencode python3 ccache zeromq"
 export PIP_PACKAGES="zmq"
-export RUN_CI_ON_HOST=true
-export RUN_UNIT_TESTS=true
-export RUN_FUNCTIONAL_TESTS=false
 export GOAL="install"
 export BITCOIN_CONFIG="--enable-gui --enable-reduce-exports --enable-werror"
+export TEST_RUNNER_EXTRA="wallet_disable"  # Only run wallet_disable as a smoke test, see https://github.com/bitcoin/bitcoin/pull/17240#issuecomment-546022121 why the other tests are disabled
 # Run without depends
 export NO_DEPENDS=1
 export OSX_SDK=""
diff --git a/ci/test/00_setup_env_native_asan.sh b/ci/test/00_setup_env_native_asan.sh
index 24c043cb52..28c63f1cf6 100644
--- a/ci/test/00_setup_env_native_asan.sh
+++ b/ci/test/00_setup_env_native_asan.sh
@@ -1,13 +1,13 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_native_asan
-export PACKAGES="clang-8 llvm-8 python3-zmq qtbase5-dev qttools5-dev-tools libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev libqrencode-dev"
+export PACKAGES="clang-8 llvm-8 python3-zmq qtbase5-dev qttools5-dev-tools libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-test-dev libboost-thread-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev libqrencode-dev"
 # Use clang-8 instead of default clang (which is clang-6 on Bionic) to avoid spurious segfaults when running on ppc64le
 export NO_DEPENDS=1
 export GOAL="install"
diff --git a/ci/test/00_setup_env_native_fuzz.sh b/ci/test/00_setup_env_native_fuzz.sh
index af93dd1d68..43ee219ef9 100644
--- a/ci/test/00_setup_env_native_fuzz.sh
+++ b/ci/test/00_setup_env_native_fuzz.sh
@@ -1,17 +1,17 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 export LC_ALL=C.UTF-8
 
+export DOCKER_NAME_TAG="ubuntu:20.04"
 export CONTAINER_NAME=ci_native_fuzz
-export PACKAGES="clang-8 llvm-8 python3 libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev"
+export PACKAGES="clang llvm python3 libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-test-dev libboost-thread-dev"
 export NO_DEPENDS=1
 export RUN_UNIT_TESTS=false
 export RUN_FUNCTIONAL_TESTS=false
 export RUN_FUZZ_TESTS=true
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-fuzz --with-sanitizers=fuzzer,address,undefined CC=clang-8 CXX=clang++-8"
-# Use clang-8, instead of default clang on bionic, which is clang-6 and does not come with libfuzzer on aarch64
+export BITCOIN_CONFIG="--enable-fuzz --with-sanitizers=fuzzer,address,undefined CC=clang CXX=clang++"
diff --git a/ci/test/00_setup_env_native_fuzz_with_valgrind.sh b/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
index 45b13a669d..c27d525003 100644
--- a/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
+++ b/ci/test/00_setup_env_native_fuzz_with_valgrind.sh
@@ -1,18 +1,18 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 export LC_ALL=C.UTF-8
 
+export DOCKER_NAME_TAG="ubuntu:20.04"
 export CONTAINER_NAME=ci_native_fuzz_valgrind
-export PACKAGES="clang-8 llvm-8 python3 libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev valgrind"
+export PACKAGES="clang llvm python3 libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-test-dev libboost-thread-dev valgrind"
 export NO_DEPENDS=1
 export RUN_UNIT_TESTS=false
 export RUN_FUNCTIONAL_TESTS=false
 export RUN_FUZZ_TESTS=true
 export FUZZ_TESTS_CONFIG="--valgrind"
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-fuzz --with-sanitizers=fuzzer CC=clang-8 CXX=clang++-8"
-# Use clang-8, instead of default clang on bionic, which is clang-6 and does not come with libfuzzer on aarch64
+export BITCOIN_CONFIG="--enable-fuzz --with-sanitizers=fuzzer CC=clang CXX=clang++"
diff --git a/ci/test/00_setup_env_native_multiprocess.sh b/ci/test/00_setup_env_native_multiprocess.sh
new file mode 100644
index 0000000000..0fc989085c
--- /dev/null
+++ b/ci/test/00_setup_env_native_multiprocess.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2020 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C.UTF-8
+
+export CONTAINER_NAME=ci_native_multiprocess
+export PACKAGES="cmake python3"
+export DEP_OPTS="MULTIPROCESS=1"
+export GOAL="install"
+export BITCOIN_CONFIG=""
+export TEST_RUNNER_ENV="BITCOIND=bitcoin-node"
diff --git a/ci/test/00_setup_env_native_nowallet.sh b/ci/test/00_setup_env_native_nowallet.sh
index 6bb371920c..9c2be4cfac 100644
--- a/ci/test/00_setup_env_native_nowallet.sh
+++ b/ci/test/00_setup_env_native_nowallet.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/ci/test/00_setup_env_native_qt5.sh b/ci/test/00_setup_env_native_qt5.sh
index 21c15236d2..fa07990756 100644
--- a/ci/test/00_setup_env_native_qt5.sh
+++ b/ci/test/00_setup_env_native_qt5.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -9,7 +9,9 @@ export LC_ALL=C.UTF-8
 export CONTAINER_NAME=ci_native_qt5
 export PACKAGES="python3-zmq qtbase5-dev qttools5-dev-tools libdbus-1-dev libharfbuzz-dev"
 export DEP_OPTS="NO_QT=1 NO_UPNP=1 DEBUG=1 ALLOW_HOST_PACKAGES=1"
-export TEST_RUNNER_EXTRA="--coverage --extended --exclude feature_dbcrash"  # Run extended tests so that coverage does not fail, but exclude the very slow dbcrash
+export TEST_RUNNER_EXTRA="--previous-releases --coverage --extended --exclude feature_dbcrash"  # Run extended tests so that coverage does not fail, but exclude the very slow dbcrash
+export RUN_UNIT_TESTS_SEQUENTIAL="true"
+export RUN_UNIT_TESTS="false"
 export GOAL="install"
-export TEST_PREVIOUS_RELEASES=true
-export BITCOIN_CONFIG="--enable-zmq --with-gui=qt5 --enable-glibc-back-compat --enable-reduce-exports --enable-debug CFLAGS=\"-g0 -O2 -funsigned-char\" CXXFLAGS=\"-g0 -O2 -funsigned-char\""
+export PREVIOUS_RELEASES_TO_DOWNLOAD="v0.15.2 v0.16.3 v0.17.1 v0.18.1 v0.19.1"
+export BITCOIN_CONFIG="--enable-zmq --with-gui=qt5 --enable-glibc-back-compat --enable-reduce-exports --enable-c++17 --enable-debug CFLAGS=\"-g0 -O2 -funsigned-char\" CXXFLAGS=\"-g0 -O2 -funsigned-char\""
diff --git a/ci/test/00_setup_env_native_tsan.sh b/ci/test/00_setup_env_native_tsan.sh
index 37884128fe..87b9d9da95 100644
--- a/ci/test/00_setup_env_native_tsan.sh
+++ b/ci/test/00_setup_env_native_tsan.sh
@@ -1,18 +1,14 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_native_tsan
-export DOCKER_NAME_TAG=ubuntu:16.04
-export PACKAGES="clang llvm python3-zmq qtbase5-dev qttools5-dev-tools libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev libqrencode-dev"
-export NO_DEPENDS=1
+export DOCKER_NAME_TAG=ubuntu:20.04
+export PACKAGES="clang llvm libc++abi-dev libc++-dev python3-zmq"
+export DEP_OPTS="CC=clang CXX='clang++ -stdlib=libc++'"
 export GOAL="install"
-export BITCOIN_CONFIG="--enable-zmq --disable-wallet --with-gui=qt5 CPPFLAGS='-DARENA_DEBUG -DDEBUG_LOCKORDER' --with-sanitizers=thread --disable-hardening --disable-asm CC=clang CXX=clang++"
-
-# xenial comes with old clang versions that can not parse the sanitizer suppressions files
-# Remove unparseable lines as a hacky workaround
-sed -i '/^implicit-/d' "${BASE_ROOT_DIR}/test/sanitizer_suppressions/ubsan"
+export BITCOIN_CONFIG="--enable-zmq --with-gui=no CPPFLAGS='-DARENA_DEBUG -DDEBUG_LOCKORDER' --with-sanitizers=thread CC=clang CXX='clang++ -stdlib=libc++'"
diff --git a/ci/test/00_setup_env_native_valgrind.sh b/ci/test/00_setup_env_native_valgrind.sh
index 156a83590c..ff7c5fe913 100644
--- a/ci/test/00_setup_env_native_valgrind.sh
+++ b/ci/test/00_setup_env_native_valgrind.sh
@@ -1,16 +1,15 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 export LC_ALL=C.UTF-8
 
 export CONTAINER_NAME=ci_native_valgrind
-export PACKAGES="valgrind clang llvm python3-zmq libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-chrono-dev libboost-test-dev libboost-thread-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev"
+export PACKAGES="valgrind clang llvm python3-zmq libevent-dev bsdmainutils libboost-system-dev libboost-filesystem-dev libboost-test-dev libboost-thread-dev libdb5.3++-dev libminiupnpc-dev libzmq3-dev"
 export USE_VALGRIND=1
 export NO_DEPENDS=1
-export TEST_RUNNER_EXTRA="p2p_segwit.py"  # Only run one test for now. TODO enable all and bump timeouts
-export RUN_FUNCTIONAL_TESTS=true
+export TEST_RUNNER_EXTRA="--exclude rpc_bind --factor=2"  # Excluded for now, see https://github.com/bitcoin/bitcoin/issues/17765#issuecomment-602068547
 export GOAL="install"
 export BITCOIN_CONFIG="--enable-zmq --with-incompatible-bdb --with-gui=no CC=clang CXX=clang++"  # TODO enable GUI
diff --git a/ci/test/00_setup_env_s390x.sh b/ci/test/00_setup_env_s390x.sh
index 72ad99fe5d..c180d023de 100644
--- a/ci/test/00_setup_env_s390x.sh
+++ b/ci/test/00_setup_env_s390x.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/ci/test/00_setup_env_win64.sh b/ci/test/00_setup_env_win64.sh
index a34933731c..8f0c62a1a6 100644
--- a/ci/test/00_setup_env_win64.sh
+++ b/ci/test/00_setup_env_win64.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2019 The Bitcoin Core developers
+# Copyright (c) 2019-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
diff --git a/ci/test/03_before_install.sh b/ci/test/03_before_install.sh
index e939b9eeeb..80806aab75 100755
--- a/ci/test/03_before_install.sh
+++ b/ci/test/03_before_install.sh
@@ -6,10 +6,6 @@
 
 export LC_ALL=C.UTF-8
 
-# Add llvm-symbolizer directory to PATH. Needed to get symbolized stack traces from the sanitizers.
-PATH=$PATH:/usr/lib/llvm-6.0/bin/
-export PATH
-
 BEGIN_FOLD () {
   echo ""
   CURRENT_FOLD_NAME=$1
diff --git a/ci/test/04_install.sh b/ci/test/04_install.sh
index c6e8331a71..165983d906 100755
--- a/ci/test/04_install.sh
+++ b/ci/test/04_install.sh
@@ -14,39 +14,19 @@ if [[ $QEMU_USER_CMD == qemu-s390* ]]; then
 fi
 
 if [ "$TRAVIS_OS_NAME" == "osx" ]; then
-  set +o errexit
-  pushd /usr/local/Homebrew || exit 1
-  git reset --hard origin/master
-  popd || exit 1
-  set -o errexit
-  ${CI_RETRY_EXE} brew unlink python@2
-  ${CI_RETRY_EXE} brew update
-  # brew upgrade returns an error if any of the packages is already up to date
-  # Failure is safe to ignore, unless we really need an update.
-  brew upgrade $BREW_PACKAGES || true
-
-  # install new packages (brew install returns an error if already installed)
-  for i in $BREW_PACKAGES; do
-    if ! brew list | grep -q $i; then
-      ${CI_RETRY_EXE} brew install $i
-    fi
-  done
-
   export PATH="/usr/local/opt/ccache/libexec:$PATH"
-
   ${CI_RETRY_EXE} pip3 install $PIP_PACKAGES
-
 fi
 
-mkdir -p "${BASE_SCRATCH_DIR}"
+# Create folders that are mounted into the docker
 mkdir -p "${CCACHE_DIR}"
 mkdir -p "${PREVIOUS_RELEASES_DIR}"
 
 export ASAN_OPTIONS="detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1"
 export LSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/lsan"
-export TSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/tsan:log_path=${BASE_SCRATCH_DIR}/sanitizer-output/tsan"
+export TSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/tsan:halt_on_error=1:log_path=${BASE_SCRATCH_DIR}/sanitizer-output/tsan"
 export UBSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1:report_error_type=1"
-env | grep -E '^(BITCOIN_CONFIG|BASE_|QEMU_|CCACHE_|WINEDEBUG|LC_ALL|BOOST_TEST_RANDOM|CONFIG_SHELL|(ASAN|LSAN|TSAN|UBSAN)_OPTIONS|TEST_PREVIOUS_RELEASES|PREVIOUS_RELEASES_DIR)' | tee /tmp/env
+env | grep -E '^(BITCOIN_CONFIG|BASE_|QEMU_|CCACHE_|LC_ALL|BOOST_TEST_RANDOM|DEBIAN_FRONTEND|CONFIG_SHELL|(ASAN|LSAN|TSAN|UBSAN)_OPTIONS|PREVIOUS_RELEASES_DIR)' | tee /tmp/env
 if [[ $HOST = *-mingw32 ]]; then
   DOCKER_ADMIN="--cap-add SYS_ADMIN"
 elif [[ $BITCOIN_CONFIG = *--with-sanitizers=*address* ]]; then # If ran with (ASan + LSan), Docker needs access to ptrace (https://github.com/google/sanitizers/issues/764)
@@ -55,7 +35,7 @@ fi
 
 export P_CI_DIR="$PWD"
 
-if [ -z "$RUN_CI_ON_HOST" ]; then
+if [ -z "$DANGER_RUN_CI_ON_HOST" ]; then
   echo "Creating $DOCKER_NAME_TAG container to run in"
   ${CI_RETRY_EXE} docker pull "$DOCKER_NAME_TAG"
 
@@ -68,17 +48,16 @@ if [ -z "$RUN_CI_ON_HOST" ]; then
                   --env-file /tmp/env \
                   --name $CONTAINER_NAME \
                   $DOCKER_NAME_TAG)
-
-  DOCKER_EXEC () {
-    docker exec $DOCKER_ID bash -c "export PATH=$BASE_SCRATCH_DIR/bins/:\$PATH && cd $P_CI_DIR && $*"
-  }
+  export DOCKER_CI_CMD_PREFIX="docker exec $DOCKER_ID"
 else
   echo "Running on host system without docker wrapper"
-  DOCKER_EXEC () {
-    bash -c "export PATH=$BASE_SCRATCH_DIR/bins/:\$PATH && cd $P_CI_DIR && $*"
-  }
 fi
 
+DOCKER_EXEC () {
+  $DOCKER_CI_CMD_PREFIX bash -c "export PATH=$BASE_SCRATCH_DIR/bins/:\$PATH && cd $P_CI_DIR && $*"
+}
+export -f DOCKER_EXEC
+
 if [ -n "$DPKG_ADD_ARCH" ]; then
   DOCKER_EXEC dpkg --add-architecture "$DPKG_ADD_ARCH"
 fi
@@ -86,7 +65,7 @@ fi
 if [[ $DOCKER_NAME_TAG == centos* ]]; then
   ${CI_RETRY_EXE} DOCKER_EXEC yum -y install epel-release
   ${CI_RETRY_EXE} DOCKER_EXEC yum -y install $DOCKER_PACKAGES $PACKAGES
-elif [ "$TRAVIS_OS_NAME" != "osx" ]; then
+elif [ "$CI_USE_APT_INSTALL" != "no" ]; then
   ${CI_RETRY_EXE} DOCKER_EXEC apt-get update
   ${CI_RETRY_EXE} DOCKER_EXEC apt-get install --no-install-recommends --no-upgrade -y $PACKAGES $DOCKER_PACKAGES
 fi
@@ -97,18 +76,21 @@ if [ "$TRAVIS_OS_NAME" == "osx" ]; then
 else
   DOCKER_EXEC free -m -h
   DOCKER_EXEC echo "Number of CPUs \(nproc\):" \$\(nproc\)
+  DOCKER_EXEC echo $(lscpu | grep Endian)
   DOCKER_EXEC echo "Free disk space:"
   DOCKER_EXEC df -h
 fi
 
 if [ ! -d ${DIR_QA_ASSETS} ]; then
+ if [ "$RUN_FUZZ_TESTS" = "true" ]; then
   DOCKER_EXEC git clone https://github.com/bitcoin-core/qa-assets ${DIR_QA_ASSETS}
+ fi
 fi
 export DIR_FUZZ_IN=${DIR_QA_ASSETS}/fuzz_seed_corpus/
 
 DOCKER_EXEC mkdir -p "${BASE_SCRATCH_DIR}/sanitizer-output/"
 
-if [ -z "$RUN_CI_ON_HOST" ]; then
+if [ -z "$DANGER_RUN_CI_ON_HOST" ]; then
   echo "Create $BASE_ROOT_DIR"
   DOCKER_EXEC rsync -a /ro_base/ $BASE_ROOT_DIR
 fi
diff --git a/ci/test/05_before_script.sh b/ci/test/05_before_script.sh
index 933f4cea91..efaaf154b1 100755
--- a/ci/test/05_before_script.sh
+++ b/ci/test/05_before_script.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2018-2019 The Bitcoin Core developers
+# Copyright (c) 2018-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -33,10 +33,12 @@ if [ -z "$NO_DEPENDS" ]; then
   else
     SHELL_OPTS="CONFIG_SHELL="
   fi
-  DOCKER_EXEC $SHELL_OPTS make $MAKEJOBS -C depends HOST=$HOST $DEP_OPTS
+  # Temporary workaround for https://github.com/bitcoin/bitcoin/issues/16368
+  python3 -c 'import time; [print(".") or time.sleep(500) for _ in range(4)]' &
+  ( DOCKER_EXEC $SHELL_OPTS make $MAKEJOBS -C depends HOST=$HOST $DEP_OPTS ) &> /dev/null
 fi
-if [ "$TEST_PREVIOUS_RELEASES" = "true" ]; then
+if [ -n "$PREVIOUS_RELEASES_TO_DOWNLOAD" ]; then
   BEGIN_FOLD previous-versions
-  DOCKER_EXEC contrib/devtools/previous_release.sh -b -t "$PREVIOUS_RELEASES_DIR" v0.17.1 v0.18.1 v0.19.0.1
+  DOCKER_EXEC contrib/devtools/previous_release.sh -b -t "$PREVIOUS_RELEASES_DIR" "${PREVIOUS_RELEASES_TO_DOWNLOAD}"
   END_FOLD
 fi
diff --git a/ci/test/06_script_a.sh b/ci/test/06_script_a.sh
index b6043cd61e..b68cd9d3f8 100755
--- a/ci/test/06_script_a.sh
+++ b/ci/test/06_script_a.sh
@@ -1,15 +1,13 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2018-2019 The Bitcoin Core developers
+# Copyright (c) 2018-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 export LC_ALL=C.UTF-8
 
 BITCOIN_CONFIG_ALL="--disable-dependency-tracking --prefix=$DEPENDS_DIR/$HOST --bindir=$BASE_OUTDIR/bin --libdir=$BASE_OUTDIR/lib"
-if [ -z "$NO_DEPENDS" ]; then
-  DOCKER_EXEC ccache --max-size=$CCACHE_SIZE
-fi
+DOCKER_EXEC "ccache --zero-stats --max-size=$CCACHE_SIZE"
 
 BEGIN_FOLD autogen
 if [ -n "$CONFIG_SHELL" ]; then
@@ -19,20 +17,18 @@ else
 fi
 END_FOLD
 
-DOCKER_EXEC mkdir -p build
-export P_CI_DIR="$P_CI_DIR/build"
+DOCKER_EXEC mkdir -p "${BASE_BUILD_DIR}"
+export P_CI_DIR="${BASE_BUILD_DIR}"
 
 BEGIN_FOLD configure
-DOCKER_EXEC ../configure --cache-file=config.cache $BITCOIN_CONFIG_ALL $BITCOIN_CONFIG || ( (DOCKER_EXEC cat config.log) && false)
+DOCKER_EXEC "${BASE_ROOT_DIR}/configure" --cache-file=config.cache $BITCOIN_CONFIG_ALL $BITCOIN_CONFIG || ( (DOCKER_EXEC cat config.log) && false)
 END_FOLD
 
 BEGIN_FOLD distdir
-# Create folder on host and docker, so that `cd` works
-mkdir -p "bitcoin-$HOST"
 DOCKER_EXEC make distdir VERSION=$HOST
 END_FOLD
 
-export P_CI_DIR="$P_CI_DIR/bitcoin-$HOST"
+export P_CI_DIR="${BASE_BUILD_DIR}/bitcoin-$HOST"
 
 BEGIN_FOLD configure
 DOCKER_EXEC ./configure --cache-file=../config.cache $BITCOIN_CONFIG_ALL $BITCOIN_CONFIG || ( (DOCKER_EXEC cat config.log) && false)
@@ -44,3 +40,9 @@ trap 'DOCKER_EXEC "cat ${BASE_SCRATCH_DIR}/sanitizer-output/* 2> /dev/null"' ERR
 BEGIN_FOLD build
 DOCKER_EXEC make $MAKEJOBS $GOAL || ( echo "Build failure. Verbose build follows." && DOCKER_EXEC make $GOAL V=1 ; false )
 END_FOLD
+
+BEGIN_FOLD cache_stats
+DOCKER_EXEC "ccache --version | head -n 1 && ccache --show-stats"
+DOCKER_EXEC du -sh "${DEPENDS_DIR}"/*/
+DOCKER_EXEC du -sh "${PREVIOUS_RELEASES_DIR}"
+END_FOLD
diff --git a/ci/test/06_script_b.sh b/ci/test/06_script_b.sh
index 3b32513353..51d84ee39d 100755
--- a/ci/test/06_script_b.sh
+++ b/ci/test/06_script_b.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2018-2019 The Bitcoin Core developers
+# Copyright (c) 2018-2020 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -21,21 +21,28 @@ if [ -n "$USE_VALGRIND" ]; then
   END_FOLD
 fi
 
+bash -c "${CI_WAIT}" &  # Print dots in case the tests take a long time to run
+
 if [ "$RUN_UNIT_TESTS" = "true" ]; then
   BEGIN_FOLD unit-tests
-  bash -c "${CI_WAIT}" &  # Print dots in case the unit tests take a long time to run
   DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib make $MAKEJOBS check VERBOSE=1
   END_FOLD
 fi
 
+if [ "$RUN_UNIT_TESTS_SEQUENTIAL" = "true" ]; then
+  BEGIN_FOLD unit-tests-seq
+  DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib "${BASE_BUILD_DIR}/bitcoin-*/src/test/test_bitcoin*" --catch_system_errors=no -l test_suite
+  END_FOLD
+fi
+
 if [ "$RUN_FUNCTIONAL_TESTS" = "true" ]; then
   BEGIN_FOLD functional-tests
-  DOCKER_EXEC test/functional/test_runner.py --ci $MAKEJOBS --tmpdirprefix "${BASE_SCRATCH_DIR}/test_runner/" --ansi --combinedlogslen=4000 ${TEST_RUNNER_EXTRA} --quiet --failfast
+  DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib ${TEST_RUNNER_ENV} test/functional/test_runner.py --ci $MAKEJOBS --tmpdirprefix "${BASE_SCRATCH_DIR}/test_runner/" --ansi --combinedlogslen=4000 ${TEST_RUNNER_EXTRA} --quiet --failfast
   END_FOLD
 fi
 
 if [ "$RUN_FUZZ_TESTS" = "true" ]; then
   BEGIN_FOLD fuzz-tests
-  DOCKER_EXEC test/fuzz/test_runner.py ${FUZZ_TESTS_CONFIG} -l DEBUG ${DIR_FUZZ_IN}
+  DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib test/fuzz/test_runner.py ${FUZZ_TESTS_CONFIG} $MAKEJOBS -l DEBUG ${DIR_FUZZ_IN}
   END_FOLD
 fi
diff --git a/ci/test/wrap-qemu.sh b/ci/test/wrap-qemu.sh
index f1d3088748..be7d7fcc1f 100755
--- a/ci/test/wrap-qemu.sh
+++ b/ci/test/wrap-qemu.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2018 The Bitcoin Core developers
+# Copyright (c) 2018-2019 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.