diff --git a/.travis.yml b/.travis.yml
index 1c19145166..8a04326bab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -43,7 +43,6 @@ before_cache:
 stages:
   - lint
   - test
-  - extended-lint
 env:
   global:
     - CI_RETRY_EXE="travis_retry"
@@ -82,19 +81,6 @@ jobs:
       script:
         - set -o errexit; source ./ci/lint/06_script.sh
 
-    - stage: extended-lint
-      name: 'extended lint [runtime >= 60 seconds]'
-      env:
-      cache: false
-      language: python
-      python: '3.5'
-      install:
-        - set -o errexit; source ./ci/extended_lint/04_install.sh
-      before_script:
-        - set -o errexit; source ./ci/lint/05_before_script.sh
-      script:
-        - set -o errexit; source ./ci/extended_lint/06_script.sh
-
     - stage: test
       name: 'ARM  [GOAL: install]  [bionic]  [unit tests, functional tests]'
       arch: arm64
diff --git a/ci/extended_lint/04_install.sh b/ci/extended_lint/04_install.sh
deleted file mode 100755
index 123d874a84..0000000000
--- a/ci/extended_lint/04_install.sh
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/usr/bin/env bash
-#
-# Copyright (c) 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.
-
-export LC_ALL=C
-
-CPPCHECK_VERSION=1.86
-curl -s https://codeload.github.com/danmar/cppcheck/tar.gz/${CPPCHECK_VERSION} | tar -zxf - --directory /tmp/
-(cd /tmp/cppcheck-${CPPCHECK_VERSION}/ && make CFGDIR=/tmp/cppcheck-${CPPCHECK_VERSION}/cfg/ > /dev/null)
-export PATH="$PATH:/tmp/cppcheck-${CPPCHECK_VERSION}/"
diff --git a/ci/extended_lint/06_script.sh b/ci/extended_lint/06_script.sh
deleted file mode 100755
index e8228c9c4d..0000000000
--- a/ci/extended_lint/06_script.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/usr/bin/env bash
-#
-# Copyright (c) 2019 The Bitcoin Core developers
-# Distributed under the MIT software license, see the accompanying
-# file COPYING or http://www.opensource.org/licenses/mit-license.php.
-
-export LC_ALL=C
-
-test/lint/extended-lint-all.sh
diff --git a/ci/test/00_setup_env.sh b/ci/test/00_setup_env.sh
index 2919072fe4..6040804a9f 100755
--- a/ci/test/00_setup_env.sh
+++ b/ci/test/00_setup_env.sh
@@ -13,6 +13,9 @@ if [ -n "${FILE_ENV}" ]; then
   source "${FILE_ENV}"
 fi
 
+# The root dir.
+# The ci system copies this folder.
+# This is where the build is done (depends and dist).
 BASE_ROOT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )"/../../ >/dev/null 2>&1 && pwd )
 export BASE_ROOT_DIR
 
@@ -20,6 +23,7 @@ echo "Fallback to default values in env (if not yet set)"
 # The number of parallel jobs to pass down to make and test_runner.py
 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:-$BASE_ROOT_DIR/ci/scratch/}
 # What host to compile for. See also ./depends/README.md
 # Tests that need cross-compilation export the appropriate HOST.
@@ -37,15 +41,18 @@ export BOOST_TEST_RANDOM=${BOOST_TEST_RANDOM:-1}
 export CCACHE_SIZE=${CCACHE_SIZE:-100M}
 export CCACHE_TEMPDIR=${CCACHE_TEMPDIR:-/tmp/.ccache-temp}
 export CCACHE_COMPRESS=${CCACHE_COMPRESS:-1}
+# The cache dir.
+# This folder exists on the ci host and ci guest. Changes are propagated back and forth.
 export CCACHE_DIR=${CCACHE_DIR:-$BASE_SCRATCH_DIR/.ccache}
-# Folder where the build is done (depends and dist). Can not be changed and is equal to the root of the git repo
-export BASE_BUILD_DIR=${BASE_BUILD_DIR:-$BASE_ROOT_DIR}
-# Folder where the build is done (bin and lib). Can not be changed.
-export BASE_OUTDIR=${BASE_OUTDIR:-$BASE_BUILD_DIR/out/$HOST}
+# 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).
+export BASE_OUTDIR=${BASE_OUTDIR:-$BASE_SCRATCH_DIR/out/$HOST}
 export SDK_URL=${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}
 export GOAL=${GOAL:-install}
-export DIR_QA_ASSETS=${DIR_QA_ASSETS:-${BASE_BUILD_DIR}/qa-assets}
+export DIR_QA_ASSETS=${DIR_QA_ASSETS:-${BASE_SCRATCH_DIR}/qa-assets}
 export PATH=${BASE_ROOT_DIR}/ci/retry:$PATH
 export CI_RETRY_EXE=${CI_RETRY_EXE:retry}
diff --git a/ci/test/04_install.sh b/ci/test/04_install.sh
index 5055a72096..9efdd30d87 100755
--- a/ci/test/04_install.sh
+++ b/ci/test/04_install.sh
@@ -34,9 +34,9 @@ mkdir -p "${BASE_SCRATCH_DIR}"
 mkdir -p "${CCACHE_DIR}"
 
 export ASAN_OPTIONS="detect_stack_use_after_return=1"
-export LSAN_OPTIONS="suppressions=${BASE_BUILD_DIR}/test/sanitizer_suppressions/lsan"
-export TSAN_OPTIONS="suppressions=${BASE_BUILD_DIR}/test/sanitizer_suppressions/tsan:log_path=${BASE_BUILD_DIR}/sanitizer-output/tsan"
-export UBSAN_OPTIONS="suppressions=${BASE_BUILD_DIR}/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=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=${BASE_SCRATCH_DIR}/sanitizer-output/tsan"
+export UBSAN_OPTIONS="suppressions=${BASE_ROOT_DIR}/test/sanitizer_suppressions/ubsan:print_stacktrace=1:halt_on_error=1"
 env | grep -E '^(BITCOIN_CONFIG|CCACHE_|WINEDEBUG|LC_ALL|BOOST_TEST_RANDOM|CONFIG_SHELL|(ASAN|LSAN|TSAN|UBSAN)_OPTIONS)' | tee /tmp/env
 if [[ $HOST = *-mingw32 ]]; then
   DOCKER_ADMIN="--cap-add SYS_ADMIN"
@@ -44,25 +44,27 @@ elif [[ $BITCOIN_CONFIG = *--with-sanitizers=*address* ]]; then # If ran with (A
   DOCKER_ADMIN="--cap-add SYS_PTRACE"
 fi
 
+export P_CI_DIR="$PWD"
+
 if [ -z "$RUN_CI_ON_HOST" ]; then
   echo "Creating $DOCKER_NAME_TAG container to run in"
   ${CI_RETRY_EXE} docker pull "$DOCKER_NAME_TAG"
 
   DOCKER_ID=$(docker run $DOCKER_ADMIN -idt \
-                  --mount type=bind,src=$BASE_BUILD_DIR,dst=/ro_base,readonly \
+                  --mount type=bind,src=$BASE_ROOT_DIR,dst=/ro_base,readonly \
                   --mount type=bind,src=$CCACHE_DIR,dst=$CCACHE_DIR \
-                  --mount type=bind,src=$BASE_BUILD_DIR/depends,dst=$BASE_BUILD_DIR/depends \
-                  -w $BASE_BUILD_DIR \
+                  --mount type=bind,src=$DEPENDS_DIR,dst=$DEPENDS_DIR \
+                  -w $BASE_ROOT_DIR \
                   --env-file /tmp/env \
                   $DOCKER_NAME_TAG)
 
   DOCKER_EXEC () {
-    docker exec $DOCKER_ID bash -c "export PATH=$BASE_SCRATCH_DIR/bins/:\$PATH && cd $PWD && $*"
+    docker exec $DOCKER_ID bash -c "export PATH=$BASE_SCRATCH_DIR/bins/:\$PATH && cd $P_CI_DIR && $*"
   }
 else
   echo "Running on host system without docker wrapper"
   DOCKER_EXEC () {
-    bash -c "export PATH=$BASE_SCRATCH_DIR/bins/:\$PATH && cd $PWD && $*"
+    bash -c "export PATH=$BASE_SCRATCH_DIR/bins/:\$PATH && cd $P_CI_DIR && $*"
   }
 fi
 
@@ -90,11 +92,11 @@ if [ ! -d ${DIR_QA_ASSETS} ]; then
 fi
 export DIR_FUZZ_IN=${DIR_QA_ASSETS}/fuzz_seed_corpus/
 
-DOCKER_EXEC mkdir -p "${BASE_BUILD_DIR}/sanitizer-output/"
+DOCKER_EXEC mkdir -p "${BASE_SCRATCH_DIR}/sanitizer-output/"
 
 if [ -z "$RUN_CI_ON_HOST" ]; then
-  echo "Create $BASE_BUILD_DIR"
-  DOCKER_EXEC rsync -a /ro_base/ $BASE_BUILD_DIR
+  echo "Create $BASE_ROOT_DIR"
+  DOCKER_EXEC rsync -a /ro_base/ $BASE_ROOT_DIR
 fi
 
 if [ "$USE_BUSY_BOX" = "true" ]; then
diff --git a/ci/test/05_before_script.sh b/ci/test/05_before_script.sh
index 3f0bba19ac..51a5830682 100755
--- a/ci/test/05_before_script.sh
+++ b/ci/test/05_before_script.sh
@@ -13,13 +13,13 @@ else
   DOCKER_EXEC echo \> \$HOME/.bitcoin
 fi
 
-DOCKER_EXEC mkdir -p depends/SDKs depends/sdk-sources
+DOCKER_EXEC mkdir -p ${DEPENDS_DIR}/SDKs ${DEPENDS_DIR}/sdk-sources
 
-if [ -n "$OSX_SDK" ] && [ ! -f depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz ]; then
-  curl --location --fail $SDK_URL/MacOSX${OSX_SDK}.sdk.tar.gz -o depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz
+if [ -n "$OSX_SDK" ] && [ ! -f ${DEPENDS_DIR}/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz ]; then
+  curl --location --fail $SDK_URL/MacOSX${OSX_SDK}.sdk.tar.gz -o ${DEPENDS_DIR}/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz
 fi
-if [ -n "$OSX_SDK" ] && [ -f depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz ]; then
-  DOCKER_EXEC tar -C depends/SDKs -xf depends/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz
+if [ -n "$OSX_SDK" ] && [ -f ${DEPENDS_DIR}/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz ]; then
+  DOCKER_EXEC tar -C ${DEPENDS_DIR}/SDKs -xf ${DEPENDS_DIR}/sdk-sources/MacOSX${OSX_SDK}.sdk.tar.gz
 fi
 if [[ $HOST = *-mingw32 ]]; then
   DOCKER_EXEC update-alternatives --set $HOST-g++ \$\(which $HOST-g++-posix\)
diff --git a/ci/test/06_script_a.sh b/ci/test/06_script_a.sh
index 34b8477197..98b75d7497 100755
--- a/ci/test/06_script_a.sh
+++ b/ci/test/06_script_a.sh
@@ -6,7 +6,7 @@
 
 export LC_ALL=C.UTF-8
 
-BITCOIN_CONFIG_ALL="--disable-dependency-tracking --prefix=$BASE_BUILD_DIR/depends/$HOST --bindir=$BASE_OUTDIR/bin --libdir=$BASE_OUTDIR/lib"
+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
@@ -19,14 +19,8 @@ else
 fi
 END_FOLD
 
-# Create folder on host and docker, so that `cd` works
-mkdir -p build
 DOCKER_EXEC mkdir -p build
-
-# Temporarily disable errexit, because Travis macOS fails without error message
-set +o errexit
-cd build || (echo "could not enter build directory"; exit 1)
-set -o errexit
+export P_CI_DIR="$P_CI_DIR/build"
 
 BEGIN_FOLD configure
 DOCKER_EXEC ../configure --cache-file=config.cache $BITCOIN_CONFIG_ALL $BITCOIN_CONFIG || ( (DOCKER_EXEC cat config.log) && false)
@@ -38,21 +32,15 @@ mkdir -p "bitcoin-$HOST"
 DOCKER_EXEC make distdir VERSION=$HOST
 END_FOLD
 
-set +o errexit
-cd "bitcoin-$HOST" || (echo "could not enter distdir bitcoin-$HOST"; exit 1)
-set -o errexit
+export P_CI_DIR="$P_CI_DIR/bitcoin-$HOST"
 
 BEGIN_FOLD configure
 DOCKER_EXEC ./configure --cache-file=../config.cache $BITCOIN_CONFIG_ALL $BITCOIN_CONFIG || ( (DOCKER_EXEC cat config.log) && false)
 END_FOLD
 
 set -o errtrace
-trap 'DOCKER_EXEC "cat ${BASE_BUILD_DIR}/sanitizer-output/* 2> /dev/null"' ERR
+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
-
-set +o errexit
-cd ${BASE_BUILD_DIR} || (echo "could not enter travis build dir $BASE_BUILD_DIR"; exit 1)
-set -o errexit
diff --git a/ci/test/06_script_b.sh b/ci/test/06_script_b.sh
index 49962bb49b..a8e0a50f36 100755
--- a/ci/test/06_script_b.sh
+++ b/ci/test/06_script_b.sh
@@ -6,11 +6,6 @@
 
 export LC_ALL=C.UTF-8
 
-# Temporarily disable errexit, because Travis macOS fails without error message
-set +o errexit
-cd "build/bitcoin-$HOST" || (echo "could not enter distdir build/bitcoin-$HOST"; exit 1)
-set -o errexit
-
 if [ -n "$QEMU_USER_CMD" ]; then
   BEGIN_FOLD wrap-qemu
   echo "Prepare to run functional tests for HOST=$HOST"
@@ -33,7 +28,7 @@ fi
 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=$BASE_BUILD_DIR/depends/$HOST/lib make $MAKEJOBS check VERBOSE=1
+  DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib make $MAKEJOBS check VERBOSE=1
   END_FOLD
 fi