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udevd: fix crash when workers time out after exit is signal caught
If udevd receives an exit signal, it releases its reference on the udev monitor in manager_exit(). If at this time a worker is hanging, and if the event timeout for this worker expires before udevd exits, udevd crashes in on_sigchld()->udev_monitor_send_device(), because the monitor has already been freed. Fix this by releasing the main process's monitor ref later, in manager_free().
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@ -293,6 +293,8 @@ static void manager_free(Manager *manager) {
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if (!manager)
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return;
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manager->monitor = sd_device_monitor_unref(manager->monitor);
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udev_builtin_exit();
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if (manager->pid == getpid_cached())
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@ -789,8 +791,6 @@ static void manager_exit(Manager *manager) {
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manager->inotify_event = sd_event_source_unref(manager->inotify_event);
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manager->fd_inotify = safe_close(manager->fd_inotify);
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manager->monitor = sd_device_monitor_unref(manager->monitor);
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/* discard queued events and kill workers */
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event_queue_cleanup(manager, EVENT_QUEUED);
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manager_kill_workers(manager);
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