service: add missing pid file unwatch in the destructor

The pid file watch could outlive the service unit if a daemon-reload
request came at the right time. The inotify event would then be
delivered to who knows where.

Fix it by unwatching in the service destructor.

Further changes will be needed to preserve the state of the pid file
watch across daemon-reload. For now let's just fix the crash observed
by Jóhann Guðmundsson:
Assertion 's->state == SERVICE_START || s->state == SERVICE_START_POST'
failed at src/service.c:2609, function service_fd_event().  Aborting

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=783118

1 files changed, 12 insertions, 11 deletions

diff --git a/src/service.c b/src/service.c
index 0a5c35ec96..4dcd306009 100644
--- a/src/service.c
+++ b/src/service.c
@@ -147,6 +147,17 @@ static void service_unwatch_main_pid(Service *s) {
         s->main_pid = 0;
 }
 
+static void service_unwatch_pid_file(Service *s) {
+        if (!s->pid_file_pathspec)
+                return;
+
+        log_debug("Stopping watch for %s's PID file %s", UNIT(s)->id, s->pid_file_pathspec->path);
+        path_spec_unwatch(s->pid_file_pathspec, UNIT(s));
+        path_spec_done(s->pid_file_pathspec);
+        free(s->pid_file_pathspec);
+        s->pid_file_pathspec = NULL;
+}
+
 static int service_set_main_pid(Service *s, pid_t pid) {
         pid_t ppid;
 
@@ -222,6 +233,7 @@ static void service_done(Unit *u) {
          * our resources */
         service_unwatch_main_pid(s);
         service_unwatch_control_pid(s);
+        service_unwatch_pid_file(s);
 
         if (s->bus_name)  {
                 unit_unwatch_bus_name(u, s->bus_name);
@@ -1389,17 +1401,6 @@ static void service_notify_sockets_dead(Service *s) {
         return;
 }
 
-static void service_unwatch_pid_file(Service *s) {
-        if (!s->pid_file_pathspec)
-                return;
-
-        log_debug("Stopping watch for %s's PID file %s", UNIT(s)->id, s->pid_file_pathspec->path);
-        path_spec_unwatch(s->pid_file_pathspec, UNIT(s));
-        path_spec_done(s->pid_file_pathspec);
-        free(s->pid_file_pathspec);
-        s->pid_file_pathspec = NULL;
-}
-
 static void service_set_state(Service *s, ServiceState state) {
         ServiceState old_state;
         assert(s);