util: prevent daemon-reload from reaping service processes.

The reaping of generator processes run as part of a daemon-reload should not
call waitid(PID_ALL). The waitid() call in execute_directory() is intended only
to reap the executed processes, but if a service process exits at about the
same time as a daemon-reload, then that service process is reaped as well,
preventing it from being reaped in the proper place in
manager_dispatch_sigchld().

Fixes https://bugs.freedesktop.org/show_bug.cgi?id=43625

diff --git a/src/util.c b/src/util.c
index 58a0aebad3d3d2ad596658396ab970c7da6d3d0b..11f77abde14412f50c6032d56c3616e2444a103d 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -4623,11 +4623,12 @@ void execute_directory(const char *directory, DIR *d, char *argv[]) {
         }
 
         while (!hashmap_isempty(pids)) {
+                pid_t pid = PTR_TO_UINT(hashmap_first_key(pids));
                 siginfo_t si;
                 char *path;
 
                 zero(si);
-                if (waitid(P_ALL, 0, &si, WEXITED) < 0) {
+                if (waitid(P_PID, pid, &si, WEXITED) < 0) {
 
                         if (errno == EINTR)
                                 continue;