1 files changed, 182 insertions, 0 deletions
diff --git a/test/units/testsuite-55.sh b/test/units/testsuite-55.sh
new file mode 100755
index 0000000..81617db
--- /dev/null
+++ b/test/units/testsuite-55.sh
@@ -0,0 +1,182 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+set -eux
+set -o pipefail
+
+# shellcheck source=test/units/util.sh
+ . "$(dirname "$0")"/util.sh
+
+systemd-analyze log-level debug
+
+# Ensure that the init.scope.d drop-in is applied on boot
+test "$(cat /sys/fs/cgroup/init.scope/memory.high)" != "max"
+
+# Loose checks to ensure the environment has the necessary features for systemd-oomd
+[[ -e /proc/pressure ]] || echo "no PSI" >>/skipped
+[[ "$(get_cgroup_hierarchy)" == "unified" ]] || echo "no cgroupsv2" >>/skipped
+[[ -x /usr/lib/systemd/systemd-oomd ]] || echo "no oomd" >>/skipped
+if [[ -s /skipped ]]; then
+    exit 0
+fi
+
+rm -rf /run/systemd/system/testsuite-55-testbloat.service.d
+
+# Activate swap file if we are in a VM
+if systemd-detect-virt --vm --quiet; then
+    if [[ "$(findmnt -n -o FSTYPE /)" == btrfs ]]; then
+        btrfs filesystem mkswapfile -s 64M /swapfile
+    else
+        dd if=/dev/zero of=/swapfile bs=1M count=64
+        chmod 0600 /swapfile
+        mkswap /swapfile
+    fi
+
+    swapon /swapfile
+    swapon --show
+fi
+
+# Configure oomd explicitly to avoid conflicts with distro dropins
+mkdir -p /run/systemd/oomd.conf.d/
+cat >/run/systemd/oomd.conf.d/99-oomd-test.conf <<EOF
+[OOM]
+DefaultMemoryPressureDurationSec=2s
+EOF
+
+mkdir -p /run/systemd/system/-.slice.d/
+cat >/run/systemd/system/-.slice.d/99-oomd-test.conf <<EOF
+[Slice]
+ManagedOOMSwap=auto
+EOF
+
+mkdir -p /run/systemd/system/user@.service.d/
+cat >/run/systemd/system/user@.service.d/99-oomd-test.conf <<EOF
+[Service]
+ManagedOOMMemoryPressure=auto
+ManagedOOMMemoryPressureLimit=0%
+EOF
+
+mkdir -p /run/systemd/system/systemd-oomd.service.d/
+cat >/run/systemd/system/systemd-oomd.service.d/debug.conf <<EOF
+[Service]
+Environment=SYSTEMD_LOG_LEVEL=debug
+EOF
+
+systemctl daemon-reload
+
+# enable the service to ensure dbus-org.freedesktop.oom1.service exists
+# and D-Bus activation works
+systemctl enable systemd-oomd.service
+
+# if oomd is already running for some reasons, then restart it to make sure the above settings to be applied
+if systemctl is-active systemd-oomd.service; then
+    systemctl restart systemd-oomd.service
+fi
+
+if [[ -v ASAN_OPTIONS || -v UBSAN_OPTIONS ]]; then
+    # If we're running with sanitizers, sd-executor might pull in quite a significant chunk of shared
+    # libraries, which in turn causes a lot of pressure that can put us in the front when sd-oomd decides to
+    # go on a killing spree. This fact is exacerbated further on Arch Linux which ships unstripped gcc-libs,
+    # so sd-executor pulls in over 30M of libs on startup. Let's make the MemoryHigh= limit a bit more
+    # generous when running with sanitizers to make the test happy.
+    mkdir -p /run/systemd/system/testsuite-55-testchill.service.d/
+    cat >/run/systemd/system/testsuite-55-testchill.service.d/99-MemoryHigh.conf <<EOF
+[Service]
+MemoryHigh=60M
+EOF
+    # Do the same for the user instance as well
+    mkdir -p /run/systemd/user/
+    cp -rfv /run/systemd/system/testsuite-55-testchill.service.d/ /run/systemd/user/
+else
+    # Ensure that we can start services even with a very low hard memory cap without oom-kills, but skip
+    # under sanitizers as they balloon memory usage.
+    systemd-run -t -p MemoryMax=10M -p MemorySwapMax=0 -p MemoryZSwapMax=0 /bin/true
+fi
+
+systemctl start testsuite-55-testchill.service
+systemctl start testsuite-55-testbloat.service
+
+# Verify systemd-oomd is monitoring the expected units
+timeout 1m bash -xec 'until oomctl | grep "/testsuite-55-workload.slice"; do sleep 1; done'
+oomctl | grep "/testsuite-55-workload.slice"
+oomctl | grep "20.00%"
+oomctl | grep "Default Memory Pressure Duration: 2s"
+
+systemctl status testsuite-55-testchill.service
+
+# systemd-oomd watches for elevated pressure for 2 seconds before acting.
+# It can take time to build up pressure so either wait 2 minutes or for the service to fail.
+for _ in {0..59}; do
+    if ! systemctl status testsuite-55-testbloat.service; then
+        break
+    fi
+    oomctl
+    sleep 2
+done
+
+# testbloat should be killed and testchill should be fine
+if systemctl status testsuite-55-testbloat.service; then exit 42; fi
+if ! systemctl status testsuite-55-testchill.service; then exit 24; fi
+
+# Make sure we also work correctly on user units.
+loginctl enable-linger testuser
+
+systemctl start --machine "testuser@.host" --user testsuite-55-testchill.service
+systemctl start --machine "testuser@.host" --user testsuite-55-testbloat.service
+
+# Verify systemd-oomd is monitoring the expected units
+# Try to avoid racing the oomctl output check by checking in a loop with a timeout
+timeout 1m bash -xec 'until oomctl | grep "/testsuite-55-workload.slice"; do sleep 1; done'
+oomctl | grep -E "/user.slice.*/testsuite-55-workload.slice"
+oomctl | grep "20.00%"
+oomctl | grep "Default Memory Pressure Duration: 2s"
+
+systemctl --machine "testuser@.host" --user status testsuite-55-testchill.service
+
+# systemd-oomd watches for elevated pressure for 2 seconds before acting.
+# It can take time to build up pressure so either wait 2 minutes or for the service to fail.
+for _ in {0..59}; do
+    if ! systemctl --machine "testuser@.host" --user status testsuite-55-testbloat.service; then
+        break
+    fi
+    oomctl
+    sleep 2
+done
+
+# testbloat should be killed and testchill should be fine
+if systemctl --machine "testuser@.host" --user status testsuite-55-testbloat.service; then exit 42; fi
+if ! systemctl --machine "testuser@.host" --user status testsuite-55-testchill.service; then exit 24; fi
+
+loginctl disable-linger testuser
+
+# only run this portion of the test if we can set xattrs
+if cgroupfs_supports_user_xattrs; then
+    sleep 120 # wait for systemd-oomd kill cool down and elevated memory pressure to come down
+
+    mkdir -p /run/systemd/system/testsuite-55-testbloat.service.d/
+    cat >/run/systemd/system/testsuite-55-testbloat.service.d/override.conf <<EOF
+[Service]
+ManagedOOMPreference=avoid
+EOF
+
+    systemctl daemon-reload
+    systemctl start testsuite-55-testchill.service
+    systemctl start testsuite-55-testmunch.service
+    systemctl start testsuite-55-testbloat.service
+
+    for _ in {0..59}; do
+        if ! systemctl status testsuite-55-testmunch.service; then
+            break
+        fi
+        oomctl
+        sleep 2
+    done
+
+    # testmunch should be killed since testbloat had the avoid xattr on it
+    if ! systemctl status testsuite-55-testbloat.service; then exit 25; fi
+    if systemctl status testsuite-55-testmunch.service; then exit 43; fi
+    if ! systemctl status testsuite-55-testchill.service; then exit 24; fi
+fi
+
+systemd-analyze log-level info
+
+touch /testok