Fix relayd: initialize beacon to -1ULL

The relayd stream beacon_ts_end field is expected to have the value
-1ULL when unset (no beacon has been received since last index).

However, the initial state is wrong. It is left at the value 0, which
indicates that a live beacon has indeed been received (which is untrue),
which in turn causes a live beacon with ctf_stream_id of -1ULL to be
sent to babeltrace, which does not expect it, and fails.

This issue can be triggered with the following scenario:

1) create live session
2) setup UST per-uid buffers tracing
3) start tracing, without any active traced application
4) hook with babeltrace live client to view the trace
5) run a traced application

Step 5) will cause the babeltrace live client to receive a stream_id of
-1ULL, and error out.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/src/bin/lttng-relayd/stream.c b/src/bin/lttng-relayd/stream.c
index 41d44a58598ff9033dfea8cdd69d44f0a63de75b..4716f9d7923f8d5ddd4ea8a2cf6ee52c790bf846 100644 (file)
--- a/src/bin/lttng-relayd/stream.c
+++ b/src/bin/lttng-relayd/stream.c
@@ -92,6 +92,7 @@ struct relay_stream *stream_create(struct ctf_trace *trace,
        stream->prev_path_name = NULL;
        stream->channel_name = channel_name;
        stream->rotate_at_seq_num = -1ULL;
+       stream->beacon_ts_end = -1ULL;
        lttng_ht_node_init_u64(&stream->node, stream->stream_handle);
        pthread_mutex_init(&stream->lock, NULL);
        urcu_ref_init(&stream->ref);