test: add coverage for #29610

As reproducing it is actually pretty easy, with the benefit of hindsight:

~# systemd-run -P -p MountImages="/this/should/definitely/not/exist.img:/run/img2\:3:nosuid" false
Running as unit: run-u42.service
free(): double free detected in tcache 2

diff --git a/test/units/testsuite-50.sh b/test/units/testsuite-50.sh
index 4142e1ebbc8cea32f5fcddafdabda13b88e1acd4..1a379ee061c94104c323efea97107f829a389adc 100755 (executable)
--- a/test/units/testsuite-50.sh
+++ b/test/units/testsuite-50.sh
@@ -674,4 +674,11 @@ if command -v mksquashfs >/dev/null 2>&1; then
     (! test -f /tmp/test-50-confext/etc/waldo )
 fi
 
+# Sneak in a couple of expected-to-fail invocations to cover
+# https://github.com/systemd/systemd/issues/29610
+(! systemd-run -P -p MountImages="/this/should/definitely/not/exist.img:/run/img2\:3:nosuid" false)
+(! systemd-run -P -p ExtensionImages="/this/should/definitely/not/exist.img" false)
+(! systemd-run -P -p RootImage="/this/should/definitely/not/exist.img" false)
+(! systemd-run -P -p ExtensionDirectories="/foo/bar /foo/baz" false)
+
 touch /testok