Fix: consumer: snapshot: assertion on subsequent snapshot

[lttng-tools.git] / src / common / kernel-consumer / kernel-consumer.cpp

diff --git a/src/common/kernel-consumer/kernel-consumer.cpp b/src/common/kernel-consumer/kernel-consumer.cpp
index 9bc66a47880d82247644ba8e1b6c4ba7c707253d..d22aea1831978225da90eaf5b5d9507bd248ca4a 100644 (file)
--- a/src/common/kernel-consumer/kernel-consumer.cpp
+++ b/src/common/kernel-consumer/kernel-consumer.cpp
@@ -135,6 +135,30 @@ error:
        return ret;
 }
 
+static void finalize_snapshot_stream(
+               struct lttng_consumer_stream *stream, uint64_t relayd_id)
+{
+       ASSERT_LOCKED(stream->lock);
+
+       if (relayd_id == (uint64_t) -1ULL) {
+               if (stream->out_fd >= 0) {
+                       const int ret = close(stream->out_fd);
+
+                       if (ret < 0) {
+                               PERROR("Failed to close stream snapshot output file descriptor");
+                       }
+
+                       stream->out_fd = -1;
+               }
+       } else {
+               close_relayd_stream(stream);
+               stream->net_seq_idx = (uint64_t) -1ULL;
+       }
+
+       lttng_trace_chunk_put(stream->trace_chunk);
+       stream->trace_chunk = NULL;
+}
+
 /*
  * Take a snapshot of all the stream of a channel
  * RCU read-side lock must be held across this function to ensure existence of
@@ -198,13 +222,13 @@ static int lttng_kconsumer_snapshot_channel(
                        ret = consumer_send_relayd_stream(stream, path);
                        if (ret < 0) {
                                ERR("sending stream to relayd");
-                               goto end_unlock;
+                               goto error_finalize_stream;
                        }
                } else {
                        ret = consumer_stream_create_output_files(stream,
                                        false);
                        if (ret < 0) {
-                               goto end_unlock;
+                               goto error_finalize_stream;
                        }
                        DBG("Kernel consumer snapshot stream (%" PRIu64 ")",
                                        stream->key);
@@ -222,7 +246,7 @@ static int lttng_kconsumer_snapshot_channel(
                        ret = kernctl_buffer_flush(stream->wait_fd);
                        if (ret < 0) {
                                ERR("Failed to flush kernel stream");
-                               goto end_unlock;
+                               goto error_finalize_stream;
                        }
                        goto end_unlock;
                }
@@ -230,19 +254,19 @@ static int lttng_kconsumer_snapshot_channel(
                ret = lttng_kconsumer_take_snapshot(stream);
                if (ret < 0) {
                        ERR("Taking kernel snapshot");
-                       goto end_unlock;
+                       goto error_finalize_stream;
                }
 
                ret = lttng_kconsumer_get_produced_snapshot(stream, &produced_pos);
                if (ret < 0) {
                        ERR("Produced kernel snapshot position");
-                       goto end_unlock;
+                       goto error_finalize_stream;
                }
 
                ret = lttng_kconsumer_get_consumed_snapshot(stream, &consumed_pos);
                if (ret < 0) {
                        ERR("Consumerd kernel snapshot position");
-                       goto end_unlock;
+                       goto error_finalize_stream;
                }
 
                consumed_pos = consumer_get_consume_start_pos(consumed_pos,
@@ -262,7 +286,7 @@ static int lttng_kconsumer_snapshot_channel(
                        if (ret < 0) {
                                if (ret != -EAGAIN) {
                                        PERROR("kernctl_get_subbuf snapshot");
-                                       goto end_unlock;
+                                       goto error_finalize_stream;
                                }
                                DBG("Kernel consumer get subbuf failed. Skipping it.");
                                consumed_pos += stream->max_sb_size;
@@ -312,26 +336,12 @@ static int lttng_kconsumer_snapshot_channel(
                        ret = kernctl_put_subbuf(stream->wait_fd);
                        if (ret < 0) {
                                ERR("Snapshot kernctl_put_subbuf");
-                               goto end_unlock;
+                               goto error_finalize_stream;
                        }
                        consumed_pos += stream->max_sb_size;
                }
 
-               if (relayd_id == (uint64_t) -1ULL) {
-                       if (stream->out_fd >= 0) {
-                               ret = close(stream->out_fd);
-                               if (ret < 0) {
-                                       PERROR("Kernel consumer snapshot close out_fd");
-                                       goto end_unlock;
-                               }
-                               stream->out_fd = -1;
-                       }
-               } else {
-                       close_relayd_stream(stream);
-                       stream->net_seq_idx = (uint64_t) -1ULL;
-               }
-               lttng_trace_chunk_put(stream->trace_chunk);
-               stream->trace_chunk = NULL;
+               finalize_snapshot_stream(stream, relayd_id);
                pthread_mutex_unlock(&stream->lock);
        }
 
@@ -344,6 +354,8 @@ error_put_subbuf:
        if (ret < 0) {
                ERR("Snapshot kernctl_put_subbuf error path");
        }
+error_finalize_stream:
+       finalize_snapshot_stream(stream, relayd_id);
 end_unlock:
        pthread_mutex_unlock(&stream->lock);
 end: