Prevent inconsistent node lists

If net_kernel "forgets" to abort a connection (as it currently might),
the garbage collection of a distribution entry could cause node lists
to enter an inconsistent state.

3 files changed, 46 insertions, 0 deletions

diff --git a/erts/emulator/beam/dist.c b/erts/emulator/beam/dist.c
index 70474898b2..16c4d689a5 100644
--- a/erts/emulator/beam/dist.c
+++ b/erts/emulator/beam/dist.c
@@ -3628,6 +3628,12 @@ static Sint abort_connection(DistEntry* dep, Uint32 conn_id)
     return 0;
 }
 
+Sint
+erts_abort_connection(DistEntry *dep, Uint32 conn_id)
+{
+    return abort_connection(dep, conn_id);
+}
+
 BIF_RETTYPE erts_internal_abort_connection_2(BIF_ALIST_2)
 {
     DistEntry* dep;
diff --git a/erts/emulator/beam/dist.h b/erts/emulator/beam/dist.h
index dda2029a4c..30b4b35c20 100644
--- a/erts/emulator/beam/dist.h
+++ b/erts/emulator/beam/dist.h
@@ -399,5 +399,7 @@ extern void erts_kill_dist_connection(DistEntry *dep, Uint32);
 
 extern Uint erts_dist_cache_size(void);
 
+extern Sint erts_abort_connection(DistEntry *dep, Uint32 conn_id);
+
 
 #endif
diff --git a/erts/emulator/beam/erl_node_tables.c b/erts/emulator/beam/erl_node_tables.c
index 1f147011a8..9b34af1480 100644
--- a/erts/emulator/beam/erl_node_tables.c
+++ b/erts/emulator/beam/erl_node_tables.c
@@ -412,6 +412,44 @@ static void schedule_delete_dist_entry(DistEntry* dep)
 static void
 start_timer_delete_dist_entry(void *vdep)
 {
+    DistEntry *dep = vdep;
+    Eterm sysname;
+    enum dist_entry_state state;
+    Uint32 connection_id;
+
+    erts_de_rlock(dep);
+    state = dep->state;
+    connection_id = dep->connection_id;
+    sysname = dep->sysname;
+    erts_de_runlock(dep);
+
+    if (state != ERTS_DE_STATE_IDLE) {
+        char *state_str;
+        erts_dsprintf_buf_t *dsbuf = erts_create_logger_dsbuf();
+        switch (state) {
+        case ERTS_DE_STATE_CONNECTED:
+            state_str = "connected";
+            break;
+        case ERTS_DE_STATE_PENDING:
+            state_str = "pending connect";
+            break;
+        case ERTS_DE_STATE_EXITING:
+            state_str = "exiting";
+            break;
+        case ERTS_DE_STATE_IDLE:
+            state_str = "idle";
+            break;
+        default:
+            state_str = "unknown";
+            break;
+        }
+        erts_dsprintf(dsbuf, "Garbage collecting distribution "
+                      "entry for node %T in state: %s",
+                      sysname, state_str);
+        erts_send_error_to_logger_nogl(dsbuf);
+        erts_abort_connection(dep, connection_id);
+    }
+    
     if (node_tab_delete_delay == 0) {
         prepare_try_delete_dist_entry(vdep);
     }