Fix debug CLI node recycling bugs
When creating a new - as opposed to recycled - debug CLI process node,
perform a proper barrier sync and node runtime update. Otherwise, the
graph replicas diverge for some period of time. That's not immediately
fatal, but it's not a good idea, either.
When renaming a debug cli process node, fix all of the name-vector
replicas before freeing the [one-and-only] name vector.
This fixes the so-called stats segment node runtime scraper crash,
which tripped over a replicated dangling reference to the
recently-freed debug CLI node name.
Change-Id: Ieffabd9f003139e534b9d79b88370439907930e5
Signed-off-by: Dave Barach <dbarach@cisco.com>
diff --git a/src/vlib/unix/cli.c b/src/vlib/unix/cli.c
index 596f418..b268db5 100644
--- a/src/vlib/unix/cli.c
+++ b/src/vlib/unix/cli.c
@@ -2670,7 +2670,7 @@
unix_cli_file_t *cf;
clib_file_t template = { 0 };
vlib_main_t *vm = um->vlib_main;
- vlib_node_t *n;
+ vlib_node_t *n = 0;
u8 *file_desc = 0;
file_desc = format (0, "%s", name);
@@ -2680,11 +2680,27 @@
if (vec_len (cm->unused_cli_process_node_indices) > 0)
{
uword l = vec_len (cm->unused_cli_process_node_indices);
+ int i;
+ vlib_main_t *this_vlib_main;
+ u8 *old_name = 0;
- /* Find node and give it new name. */
- n = vlib_get_node (vm, cm->unused_cli_process_node_indices[l - 1]);
- vec_free (n->name);
- n->name = (u8 *) name;
+ /*
+ * Nodes are bulk-copied, so node name pointers are shared.
+ * Find the cli node in all graph replicas, and give all of them
+ * the same new name.
+ * Then, throw away the old shared name-vector.
+ */
+ for (i = 0; i < vec_len (vlib_mains); i++)
+ {
+ this_vlib_main = vlib_mains[i];
+ if (this_vlib_main == 0)
+ continue;
+ n = vlib_get_node (this_vlib_main,
+ cm->unused_cli_process_node_indices[l - 1]);
+ old_name = n->name;
+ n->name = (u8 *) name;
+ }
+ vec_free (old_name);
vlib_node_set_state (vm, n->index, VLIB_NODE_STATE_POLLING);
@@ -2699,10 +2715,15 @@
};
r.name = name;
+
+ vlib_worker_thread_barrier_sync (vm);
+
vlib_register_node (vm, &r);
vec_free (name);
n = vlib_get_node (vm, r.index);
+ vlib_worker_thread_node_runtime_update ();
+ vlib_worker_thread_barrier_release (vm);
}
pool_get (cm->cli_file_pool, cf);