diff --git a/.github/workflows/build-dependencies.txt b/.github/workflows/build-dependencies.txt
new file mode 100644
index 0000000000..1dc745d5f6
--- /dev/null
+++ b/.github/workflows/build-dependencies.txt
@@ -0,0 +1,48 @@
+acl
+alien
+attr
+autoconf
+bc
+build-essential
+curl
+dbench
+fakeroot
+fio
+gdb
+gdebi
+git
+ksh
+lcov
+libacl1-dev
+libaio-dev
+libattr1-dev
+libblkid-dev
+libcurl4-openssl-dev
+libdevmapper-dev
+libelf-dev
+libffi-dev
+libmount-dev
+libpam0g-dev
+libselinux-dev
+libssl-dev
+libtool
+libudev-dev
+lsscsi
+mdadm
+nfs-kernel-server
+pamtester
+parted
+python3
+python3-cffi
+python3-dev
+python3-packaging
+python3-setuptools
+rng-tools
+samba
+sysstat
+uuid-dev
+watchdog
+wget
+xfslibs-dev
+xz-utils
+zlib1g-dev
diff --git a/.github/workflows/checkstyle.yaml b/.github/workflows/checkstyle.yaml
index a102b6e8aa..abc0ff1191 100644
--- a/.github/workflows/checkstyle.yaml
+++ b/.github/workflows/checkstyle.yaml
@@ -6,7 +6,7 @@ on:
 
 jobs:
   checkstyle:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
       with:
@@ -14,31 +14,37 @@ jobs:
     - name: Install dependencies
       run: |
         sudo apt-get update
-        sudo apt-get install --yes -qq build-essential autoconf libtool gawk alien fakeroot linux-headers-$(uname -r)
-        sudo apt-get install --yes -qq zlib1g-dev uuid-dev libattr1-dev libblkid-dev libselinux-dev libudev-dev libssl-dev python3 python3-dev python3-setuptools python3-cffi
-        # packages for tests
-        sudo apt-get install --yes -qq parted lsscsi ksh attr acl nfs-kernel-server fio
-        sudo apt-get install --yes -qq mandoc cppcheck pax-utils devscripts
-        sudo -E pip --quiet install flake8
+        sudo xargs --arg-file=${{ github.workspace }}/.github/workflows/build-dependencies.txt apt-get install -qq
+        sudo apt-get install -qq mandoc cppcheck pax-utils devscripts
+        sudo python3 -m pip install --quiet flake8
+        sudo apt-get clean
+
+        # confirm that the tools are installed
+        # the build system doesn't fail when they are not
+        checkbashisms --version
+        cppcheck --version
+        flake8 --version
+        scanelf --version
+        shellcheck --version
     - name: Prepare
       run: |
-        sh ./autogen.sh
+        ./autogen.sh
         ./configure
-        make -j$(nproc)
+        make -j$(nproc) --no-print-directory --silent
     - name: Checkstyle
       run: |
-        make checkstyle
+        make -j$(nproc) --no-print-directory --silent checkstyle
     - name: Lint
       run: |
-        make lint
+        make -j$(nproc) --no-print-directory --silent lint
     - name: CheckABI
       id: CheckABI
       run: |
-        sudo docker run -v $(pwd):/source ghcr.io/openzfs/libabigail make checkabi
+        docker run -v $(pwd):/source ghcr.io/openzfs/libabigail make -j$(nproc) --no-print-directory --silent checkabi
     - name: StoreABI
       if: failure() && steps.CheckABI.outcome == 'failure'
       run: |
-        sudo docker run -v $(pwd):/source ghcr.io/openzfs/libabigail make storeabi
+        docker run -v $(pwd):/source ghcr.io/openzfs/libabigail make -j$(nproc) --no-print-directory --silent storeabi
     - name: Prepare artifacts
       if: failure() && steps.CheckABI.outcome == 'failure'
       run: |
diff --git a/.github/workflows/zfs-tests-functional.yml b/.github/workflows/zfs-tests-functional.yml
index ba3b2e11cf..a7be5f4561 100644
--- a/.github/workflows/zfs-tests-functional.yml
+++ b/.github/workflows/zfs-tests-functional.yml
@@ -18,24 +18,17 @@ jobs:
     - name: Install dependencies
       run: |
         sudo apt-get update
-        sudo apt-get install --yes -qq build-essential autoconf libtool gdb lcov \
-          git alien fakeroot wget curl bc fio acl \
-          sysstat mdadm lsscsi parted gdebi attr dbench watchdog ksh \
-          nfs-kernel-server samba rng-tools xz-utils \
-          zlib1g-dev uuid-dev libblkid-dev libselinux-dev \
-          xfslibs-dev libattr1-dev libacl1-dev libudev-dev libdevmapper-dev \
-          libssl-dev libffi-dev libaio-dev libelf-dev libmount-dev \
-          libpam0g-dev pamtester libcurl4-openssl-dev \
-          python3 python3-dev python3-setuptools python3-cffi python3-packaging
+        xargs --arg-file=${{ github.workspace }}/.github/workflows/build-dependencies.txt sudo apt-get install -qq
+        sudo apt-get clean
     - name: Autogen.sh
       run: |
-        sh autogen.sh
+        ./autogen.sh
     - name: Configure
       run: |
         ./configure --enable-debug --enable-debuginfo --enable-asan --enable-ubsan
     - name: Make
       run: |
-        make --no-print-directory -s pkg-utils pkg-kmod
+        make -j$(nproc) --no-print-directory --silent pkg-utils pkg-kmod
     - name: Install
       run: |
         sudo dpkg -i *.deb
@@ -61,6 +54,9 @@ jobs:
         sudo rm -rf /opt/ghc
         sudo rm -rf "/usr/local/share/boost"
         sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+    - name: Clear the kernel ring buffer
+      run: |
+        sudo dmesg -c >/var/tmp/dmesg-prerun
     - name: Tests
       run: |
         /usr/share/zfs/zfs-tests.sh -vR -s 3G
@@ -70,7 +66,7 @@ jobs:
       run: |
         RESULTS_PATH=$(readlink -f /var/tmp/test_results/current)
         sudo dmesg > $RESULTS_PATH/dmesg
-        sudo cp /var/log/syslog $RESULTS_PATH/
+        sudo cp /var/log/syslog /var/tmp/dmesg-prerun $RESULTS_PATH/
         sudo chmod +r $RESULTS_PATH/*
         # Replace ':' in dir names, actions/upload-artifact doesn't support it
         for f in $(find /var/tmp/test_results -name '*:*'); do mv "$f" "${f//:/__}"; done
@@ -78,5 +74,7 @@ jobs:
       if: failure()
       with:
         name: Test logs Ubuntu-${{ matrix.os }}
-        path: /var/tmp/test_results/20*/
+        path: |
+          /var/tmp/test_results/*
+          !/var/tmp/test_results/current
         if-no-files-found: ignore
diff --git a/.github/workflows/zfs-tests-sanity.yml b/.github/workflows/zfs-tests-sanity.yml
index abe7974ddd..008c5a2b48 100644
--- a/.github/workflows/zfs-tests-sanity.yml
+++ b/.github/workflows/zfs-tests-sanity.yml
@@ -6,7 +6,7 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v2
       with:
@@ -14,24 +14,17 @@ jobs:
     - name: Install dependencies
       run: |
         sudo apt-get update
-        sudo apt-get install --yes -qq build-essential autoconf libtool gdb lcov \
-          git alien fakeroot wget curl bc fio acl \
-          sysstat mdadm lsscsi parted gdebi attr dbench watchdog ksh \
-          nfs-kernel-server samba rng-tools xz-utils \
-          zlib1g-dev uuid-dev libblkid-dev libselinux-dev \
-          xfslibs-dev libattr1-dev libacl1-dev libudev-dev libdevmapper-dev \
-          libssl-dev libffi-dev libaio-dev libelf-dev libmount-dev \
-          libpam0g-dev pamtester libcurl4-openssl-dev \
-          python3 python3-dev python3-setuptools python3-cffi python3-packaging
+        xargs --arg-file=${{ github.workspace }}/.github/workflows/build-dependencies.txt sudo apt-get install -qq
+        sudo apt-get clean
     - name: Autogen.sh
       run: |
-        sh autogen.sh
+        ./autogen.sh
     - name: Configure
       run: |
         ./configure --enable-debug --enable-debuginfo --enable-asan --enable-ubsan
     - name: Make
       run: |
-        make --no-print-directory -s pkg-utils pkg-kmod
+        make -j$(nproc) --no-print-directory --silent pkg-utils pkg-kmod
     - name: Install
       run: |
         sudo dpkg -i *.deb
@@ -57,6 +50,9 @@ jobs:
         sudo rm -rf /opt/ghc
         sudo rm -rf "/usr/local/share/boost"
         sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+    - name: Clear the kernel ring buffer
+      run: |
+        sudo dmesg -c >/var/tmp/dmesg-prerun
     - name: Tests
       run: |
         /usr/share/zfs/zfs-tests.sh -vR -s 3G -r sanity
@@ -66,13 +62,15 @@ jobs:
       run: |
         RESULTS_PATH=$(readlink -f /var/tmp/test_results/current)
         sudo dmesg > $RESULTS_PATH/dmesg
-        sudo cp /var/log/syslog $RESULTS_PATH/
+        sudo cp /var/log/syslog /var/tmp/dmesg-prerun $RESULTS_PATH/
         sudo chmod +r $RESULTS_PATH/*
         # Replace ':' in dir names, actions/upload-artifact doesn't support it
         for f in $(find /var/tmp/test_results -name '*:*'); do mv "$f" "${f//:/__}"; done
     - uses: actions/upload-artifact@v2
       if: failure()
       with:
-        name: Test logs
-        path: /var/tmp/test_results/20*/
+        name: Test logs Ubuntu-${{ matrix.os }}
+        path: |
+          /var/tmp/test_results/*
+          !/var/tmp/test_results/current
         if-no-files-found: ignore
diff --git a/.github/workflows/zloop.yml b/.github/workflows/zloop.yml
index 0638bbe58f..8eb2a1d9bb 100644
--- a/.github/workflows/zloop.yml
+++ b/.github/workflows/zloop.yml
@@ -6,7 +6,7 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     env:
       TEST_DIR: /var/tmp/zloop
     steps:
@@ -16,22 +16,17 @@ jobs:
     - name: Install dependencies
       run: |
         sudo apt-get update
-        sudo apt-get install --yes -qq build-essential autoconf libtool gdb \
-          git alien fakeroot \
-          zlib1g-dev uuid-dev libblkid-dev libselinux-dev \
-          xfslibs-dev libattr1-dev libacl1-dev libudev-dev libdevmapper-dev \
-          libssl-dev libffi-dev libaio-dev libelf-dev libmount-dev \
-          libpam0g-dev \
-          python3 python3-dev python3-setuptools python3-cffi python3-packaging
+        xargs --arg-file=${{ github.workspace }}/.github/workflows/build-dependencies.txt sudo apt-get install -qq
+        sudo apt-get clean
     - name: Autogen.sh
       run: |
-        sh autogen.sh
+        ./autogen.sh
     - name: Configure
       run: |
         ./configure --enable-debug --enable-debuginfo --enable-asan --enable-ubsan
     - name: Make
       run: |
-        make --no-print-directory -s pkg-utils pkg-kmod
+        make -j$(nproc) --no-print-directory --silent pkg-utils pkg-kmod
     - name: Install
       run: |
         sudo dpkg -i *.deb