Fix: take session list lock when listing tp

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

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index 1a5eeb07e01dce2b1fcd22fdbb11f9b639b99ff6..5c5bda277373080f89f61772fb73a41b25d1c80c 100644 (file)
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -205,8 +205,10 @@ static pthread_t jul_reg_thread;
  * UST registration command queue. This queue is tied with a futex and uses a N
  * wakers / 1 waiter implemented and detailed in futex.c/.h
  *
- * The thread_manage_apps and thread_dispatch_ust_registration interact with
- * this queue and the wait/wake scheme.
+ * The thread_registration_apps and thread_dispatch_ust_registration uses this
+ * queue along with the wait/wake scheme. The thread_manage_apps receives down
+ * the line new application socket and monitors it for any I/O error or clean
+ * close that triggers an unregistration of the application.
  */
 static struct ust_cmd_queue ust_cmd_queue;
 
@@ -3159,7 +3161,9 @@ skip_domain:
                struct lttng_event *events;
                ssize_t nb_events;
 
+               session_lock_list();
                nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
+               session_unlock_list();
                if (nb_events < 0) {
                        /* Return value is a negative lttng_error_code. */
                        ret = -nb_events;
@@ -3190,8 +3194,10 @@ skip_domain:
                struct lttng_event_field *fields;
                ssize_t nb_fields;
 
+               session_lock_list();
                nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
                                &fields);
+               session_unlock_list();
                if (nb_fields < 0) {
                        /* Return value is a negative lttng_error_code. */
                        ret = -nb_fields;