scoutfs-tests: add setup-error-teardown

Add a test which makes sure that errors during setup can be properly
torn down.  This found an assertion that was being triggered during lock
shudown.

Signed-off-by: Zach Brown <zab@versity.com>

tests/golden/setup-error-teardown

@@ -0,0 +1 @@
+== interrupt waiting mount with no options

tests/sequence

@@ -19,6 +19,7 @@ dirent-consistency.sh
 lock-ex-race-processes.sh
 lock-conflicting-batch-commit.sh
 cross-mount-data-free.sh
+setup-error-teardown.sh
 mount-unmount-race.sh
 createmany-parallel-mounts.sh
 archive-light-cycle.sh

tests/tests/setup-error-teardown.sh

@@ -0,0 +1,20 @@
+#
+# test setup error teardown
+#
+# Make sure that we're properly cleaning up partially built up state by
+# hitting errors while setting up subsystems during mount.
+#
+
+t_require_commands sleep killall
+
+echo "== interrupt waiting mount with no options"
+t_umount_all
+mount -t scoutfs $T_B0 $T_M0 &
+pid="$!"
+sleep .1
+kill $pid
+# silence terminated message
+wait "$pid" 2> /dev/null
+t_mount_all
+
+t_pass