test: add test for large uevent message

test/units/testsuite-17.09.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+set -ex
+set -o pipefail
+
+# shellcheck source=test/units/assert.sh
+. "$(dirname "$0")"/assert.sh
+
+# This is a test for issue #24987.
+
+mkdir -p /run/udev/rules.d/
+cat >/run/udev/rules.d/50-testsuite.rules <<EOF
+SUBSYSTEM!="mem", GOTO="test-end"
+KERNEL!="null", GOTO="test-end"
+ACTION=="remove", GOTO="test-end"
+
+# add 100 * 100byte of properties
+$(for ((i = 0; i < 100; i++)); do printf 'ENV{XXX%03i}="0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789"\n' "$i"; done)
+
+LABEL="test-end"
+EOF
+
+udevadm control --reload
+
+TMPDIR=$(mktemp -d -p /tmp udev-tests.XXXXXX)
+SYSTEMD_LOG_LEVEL=debug udevadm monitor --udev --property --subsystem-match=mem >"$TMPDIR"/monitor.txt 2>&1 &
+KILL_PID="$!"
+
+FOUND=
+for _ in {1..40}; do
+    if grep -F 'UDEV - the event which udev sends out after rule processing' "$TMPDIR"/monitor.txt; then
+        FOUND=1
+        break
+    fi
+    sleep .5
+done
+[[ -n "$FOUND" ]]
+
+udevadm trigger --verbose --settle --action add /dev/null
+
+FOUND=
+for _ in {1..40}; do
+    if ! grep -e 'UDEV *\[[0-9.]*\] *add *\/devices\/virtual\/mem\/null (mem)' "$TMPDIR"/monitor.txt; then
+        sleep .5
+        continue
+    fi
+
+    FOUND=1
+    for ((i = 0; i < 100; i++)); do
+        if ! grep -F "$(printf 'XXX%03i=0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789' "$i")" "$TMPDIR"/monitor.txt; then
+            FOUND=
+            break
+        fi
+    done
+    if [[ -n "$FOUND" ]]; then
+        break;
+    fi
+
+    sleep .5
+done
+[[ -n "$FOUND" ]]
+
+# cleanup
+rm -f /run/udev/rules.d/50-testsuite.rules
+udevadm control --reload
+
+kill "$KILL_PID"
+rm -rf "$TMPDIR"
+
+exit 0