Fix: relayd: live: erroneous message timestamp observed from live viewer

[lttng-tools.git] / src / bin / lttng-relayd / viewer-stream.c

diff --git a/src/bin/lttng-relayd/viewer-stream.c b/src/bin/lttng-relayd/viewer-stream.c
index 67c452eec7d4264139f1134b1fcdd4bc2aa2d49c..a18f21ad74aeea16f836df60ae38f99d154ec12f 100644 (file)
--- a/src/bin/lttng-relayd/viewer-stream.c
+++ b/src/bin/lttng-relayd/viewer-stream.c
@@ -302,7 +302,15 @@ void viewer_stream_sync_tracefile_array_tail(struct relay_viewer_stream *vstream
        if (seq_tail == -1ULL) {
                seq_tail = 0;
        }
-       vstream->index_sent_seqcount = seq_tail;
+
+       /*
+        * Move the index sent seqcount forward if it was lagging behind
+        * the new tail of the tracefile array. If the current
+        * index_sent_seqcount is already further than the tracefile
+        * array tail position, keep its current position.
+        */
+       vstream->index_sent_seqcount = seq_tail > vstream->index_sent_seqcount ?
+                       seq_tail : vstream->index_sent_seqcount;
 }
 
 /*