Add documentation and test for kernel env var shutdown_timeout

4 files changed, 109 insertions, 3 deletions

diff --git a/lib/kernel/test/application_SUITE.erl b/lib/kernel/test/application_SUITE.erl
index 2c5b8ccb66..f469a0af98 100644
--- a/lib/kernel/test/application_SUITE.erl
+++ b/lib/kernel/test/application_SUITE.erl
@@ -33,7 +33,7 @@
 
 -export([config_change/1,
 	 distr_changed_tc1/1, distr_changed_tc2/1,
-	 shutdown_func/1, do_shutdown/1]).
+	 shutdown_func/1, do_shutdown/1, shutdown_timeout/1]).
 
 -define(TESTCASE, testcase_name).
 -define(testcase, ?config(?TESTCASE, Config)).
@@ -50,7 +50,7 @@ all() ->
      load_use_cache, {group, reported_bugs}, start_phases,
      script_start, nodedown_start, permit_false_start_local,
      permit_false_start_dist, get_key,
-     {group, distr_changed}, config_change, shutdown_func].
+     {group, distr_changed}, config_change, shutdown_func, shutdown_timeout].
 
 groups() -> 
     [{reported_bugs, [],
@@ -1915,6 +1915,32 @@ do_shutdown(Reason) ->
 
 
 
+%%%-----------------------------------------------------------------
+%%% Tests the 'shutdown_timeout' kernel config parameter
+%%%-----------------------------------------------------------------
+shutdown_timeout(Config) when is_list(Config) ->
+    DataDir = ?config(data_dir,Config),
+    {ok,Cp1} = start_node(?MODULE_STRING++"_shutdown_timeout"),
+    wait_for_ready_net(),
+    ok = rpc:call(Cp1, application, set_env, [kernel, shutdown_timeout, 1000]),
+    rpc:call(Cp1, code, add_path, [filename:join([DataDir,deadlock])]),
+    ok = rpc:call(Cp1, application, start, [sasl]),
+    ok = rpc:call(Cp1, application, start, [deadlock]),
+    rpc:call(Cp1, deadlock, restart_and_fail, []),
+
+    ok = net_kernel:monitor_nodes(true),
+    _ = rpc:call(Cp1, init, stop, []),
+    receive
+	{nodedown,Cp1} ->
+	    ok
+    after 10000 ->
+	    ct:fail("timeout 10 sec: node termination hangs")
+    end,
+    ok.
+
+
+
+
 %%-----------------------------------------------------------------
 %% Utility functions
 %%-----------------------------------------------------------------
diff --git a/lib/kernel/test/application_SUITE_data/Makefile.src b/lib/kernel/test/application_SUITE_data/Makefile.src
index a237f6badb..abc3c82907 100644
--- a/lib/kernel/test/application_SUITE_data/Makefile.src
+++ b/lib/kernel/test/application_SUITE_data/Makefile.src
@@ -2,7 +2,8 @@ EFLAGS=+debug_info
            
 all: app_start_error.@EMULATOR@ trans_abnormal_sup.@EMULATOR@ \
      trans_normal_sup.@EMULATOR@ transient.@EMULATOR@ \
-     group_leader_sup.@EMULATOR@ group_leader.@EMULATOR@
+     group_leader_sup.@EMULATOR@ group_leader.@EMULATOR@ \
+     deadlock/deadlock.@EMULATOR@
 
 app_start_error.@EMULATOR@: app_start_error.erl
 	erlc $(EFLAGS) app_start_error.erl
@@ -22,3 +23,5 @@ group_leader.@EMULATOR@: group_leader.erl
 group_leader_sup.@EMULATOR@: group_leader_sup.erl
 	erlc $(EFLAGS) group_leader_sup.erl
 
+deadlock/deadlock.@EMULATOR@: deadlock/deadlock.erl
+	erlc $(EFLAGS) -o deadlock deadlock/deadlock.erl
\ No newline at end of file
diff --git a/lib/kernel/test/application_SUITE_data/deadlock/deadlock.app b/lib/kernel/test/application_SUITE_data/deadlock/deadlock.app
new file mode 100644
index 0000000000..0c1001bed6
--- /dev/null
+++ b/lib/kernel/test/application_SUITE_data/deadlock/deadlock.app
@@ -0,0 +1,8 @@
+{application, deadlock, [
+  {vsn, "1"},
+  {registered, []},
+  {applications, [kernel, stdlib, sasl]},
+  {modules, [deadlock]},
+  {mod, {deadlock, []}},
+  {env, [{fail_start, false}]}
+]}.
diff --git a/lib/kernel/test/application_SUITE_data/deadlock/deadlock.erl b/lib/kernel/test/application_SUITE_data/deadlock/deadlock.erl
new file mode 100644
index 0000000000..5f68bf9078
--- /dev/null
+++ b/lib/kernel/test/application_SUITE_data/deadlock/deadlock.erl
@@ -0,0 +1,69 @@
+-module(deadlock).
+-behaviour(application).
+-compile(export_all).
+-define(SUP,deadlock_sup).
+-define(CHILD,deadlock_child).
+
+
+%%%-----------------------------------------------------------------
+%%% application callbacks
+start(_StartType, _StartArgs) ->
+    supervisor:start_link({local, ?SUP}, ?MODULE, [sup]).
+
+stop(_State) ->
+    ok.
+
+
+
+%%%-----------------------------------------------------------------
+%%% supervisor callbacks
+init([sup]) ->
+    {ok, {{one_for_one, 5, 10}, [
+        {
+            sasl_syslog_dm, {?MODULE, start_link, []},
+            permanent, brutal_kill, worker,
+            [deadlock]
+        }
+    ]}};
+
+
+%%%-----------------------------------------------------------------
+%%% gen_server callbacks
+init([child]) ->
+    case application:get_env(deadlock, fail_start) of
+        {ok, false} ->
+            %% we must not fail on the first init, otherwise supervisor
+            %% terminates immediately
+            {ok, []};
+        {ok, true}  ->
+	    timer:sleep(infinity), % init hangs!!!!
+	    {ok, []}
+    end.
+
+handle_call(_Req, _From, State) ->
+    {reply, ok, State}.
+
+handle_cast(restart, State) ->
+    {stop, error, State}.
+
+handle_info(_Msg, State) ->
+    {noreply, State}.
+
+terminate(_Reason, _State) ->
+    ok.
+
+code_change(_OldVsn, State, _Extra) ->
+    {ok, State}.
+
+
+%%%-----------------------------------------------------------------
+%%% Start child
+start_link() ->
+    gen_server:start_link({local, ?CHILD}, ?MODULE, [child], []).
+
+
+%%%-----------------------------------------------------------------
+%%% Provoke hanging
+restart_and_fail() ->
+    application:set_env(deadlock, fail_start, true), % next init will hang
+    gen_server:cast(?CHILD, restart).