Fix: stream intersection fails on snapshot of cleared session

[lttng-tools.git] / src / bin / lttng-sessiond / ust-app.c

diff --git a/src/bin/lttng-sessiond/ust-app.c b/src/bin/lttng-sessiond/ust-app.c
index 8c314ec1c9688d5df77c1eefc8fa047988e0d474..befbfab32dc2c692b56ef3005e4e46ad0ef9bf2a 100644 (file)
--- a/src/bin/lttng-sessiond/ust-app.c
+++ b/src/bin/lttng-sessiond/ust-app.c
@@ -6644,3 +6644,126 @@ end:
        rcu_read_unlock();
        return cmd_ret;
 }
+
+/*
+ * This function skips the metadata channel as the begin/end timestamps of a
+ * metadata packet are useless.
+ *
+ * Moreover, opening a packet after a "clear" will cause problems for live
+ * sessions as it will introduce padding that was not part of the first trace
+ * chunk. The relay daemon expects the content of the metadata stream of
+ * successive metadata trace chunks to be strict supersets of one another.
+ *
+ * For example, flushing a packet at the beginning of the metadata stream of
+ * a trace chunk resulting from a "clear" session command will cause the
+ * size of the metadata stream of the new trace chunk to not match the size of
+ * the metadata stream of the original chunk. This will confuse the relay
+ * daemon as the same "offset" in a metadata stream will no longer point
+ * to the same content.
+ */
+enum lttng_error_code ust_app_open_packets(struct ltt_session *session)
+{
+       enum lttng_error_code ret = LTTNG_OK;
+       struct lttng_ht_iter iter;
+       struct ltt_ust_session *usess = session->ust_session;
+
+       assert(usess);
+
+       rcu_read_lock();
+
+       switch (usess->buffer_type) {
+       case LTTNG_BUFFER_PER_UID:
+       {
+               struct buffer_reg_uid *reg;
+
+               cds_list_for_each_entry (
+                               reg, &usess->buffer_reg_uid_list, lnode) {
+                       struct buffer_reg_channel *reg_chan;
+                       struct consumer_socket *socket;
+
+                       socket = consumer_find_socket_by_bitness(
+                                       reg->bits_per_long, usess->consumer);
+                       if (!socket) {
+                               ret = LTTNG_ERR_FATAL;
+                               goto error;
+                       }
+
+                       cds_lfht_for_each_entry(reg->registry->channels->ht,
+                                       &iter.iter, reg_chan, node.node) {
+                               const int open_ret =
+                                               consumer_open_channel_packets(
+                                                       socket,
+                                                       reg_chan->consumer_key);
+
+                               if (open_ret < 0) {
+                                       ret = LTTNG_ERR_UNK;
+                                       goto error;
+                               }
+                       }
+               }
+               break;
+       }
+       case LTTNG_BUFFER_PER_PID:
+       {
+               struct ust_app *app;
+
+               cds_lfht_for_each_entry (
+                               ust_app_ht->ht, &iter.iter, app, pid_n.node) {
+                       struct consumer_socket *socket;
+                       struct lttng_ht_iter chan_iter;
+                       struct ust_app_channel *ua_chan;
+                       struct ust_app_session *ua_sess;
+                       struct ust_registry_session *registry;
+
+                       ua_sess = lookup_session_by_app(usess, app);
+                       if (!ua_sess) {
+                               /* Session not associated with this app. */
+                               continue;
+                       }
+
+                       /* Get the right consumer socket for the application. */
+                       socket = consumer_find_socket_by_bitness(
+                                       app->bits_per_long, usess->consumer);
+                       if (!socket) {
+                               ret = LTTNG_ERR_FATAL;
+                               goto error;
+                       }
+
+                       registry = get_session_registry(ua_sess);
+                       if (!registry) {
+                               DBG("Application session is being torn down. Skip application.");
+                               continue;
+                       }
+
+                       cds_lfht_for_each_entry(ua_sess->channels->ht,
+                                       &chan_iter.iter, ua_chan, node.node) {
+                               const int open_ret =
+                                               consumer_open_channel_packets(
+                                                       socket,
+                                                       ua_chan->key);
+
+                               if (open_ret < 0) {
+                                       /*
+                                        * Per-PID buffer and application going
+                                        * away.
+                                        */
+                                       if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) {
+                                               continue;
+                                       }
+
+                                       ret = LTTNG_ERR_UNK;
+                                       goto error;
+                               }
+                       }
+               }
+               break;
+       }
+       default:
+               abort();
+               break;
+       }
+
+error:
+       rcu_read_unlock();
+       return ret;
+}