File 0108-logger-Fix-repeated-filesync-shutdown-time... of Package erlang

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File 0108-logger-Fix-repeated-filesync-shutdown-timeout.patch of Package erlang (Revision 371fc947ce89baa340e0441f200e4667)

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From 3bb17665ea77e1b549ae3f3da2c9189f019620ad Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Mon, 28 Mar 2022 11:02:07 +0200
Subject: [PATCH] logger: Fix repeated filesync shutdown timeout

The commit 06cacbc (aka PR #4811) changed where the timer_server
is located in the supervisor tree of Kernel. This change caused
the timer_server to be terminated before logger, which meant that
the calls to timer:cancel from any logger backend would timeout.

We solve this by instead using erlang:start_timer for the repeated
filesync timer.

Closes #5780
---
 lib/kernel/src/logger_h_common.erl          | 58 ++++++++++++---------
 lib/kernel/test/logger_disk_log_h_SUITE.erl | 11 ++--
 lib/kernel/test/logger_std_h_SUITE.erl      |  9 ++--
 3 files changed, 47 insertions(+), 31 deletions(-)

diff --git a/lib/kernel/src/logger_h_common.erl b/lib/kernel/src/logger_h_common.erl
index bbd45ac73d..f0db587af1 100644
--- a/lib/kernel/src/logger_h_common.erl
+++ b/lib/kernel/src/logger_h_common.erl
@@ -260,17 +260,39 @@ handle_call(filesync, _From, State = #{id := Name,
     {Result,HandlerState1} = Module:filesync(Name,sync,HandlerState),
     {reply, Result, State#{handler_state=>HandlerState1, last_op=>sync}}.
 
+handle_cast({config_changed, CommonConfig, HConfig},
+            State = #{id := Name,
+                      module := Module,
+                      handler_state := HandlerState,
+                      filesync_repeat_interval := OldFSyncInt}) ->
+    State1 =
+        case maps:get(filesync_repeat_interval,CommonConfig) of
+            OldFSyncInt ->
+                State;
+            FSyncInt ->
+                set_repeated_filesync(
+                  cancel_repeated_filesync(
+                    State#{filesync_repeat_interval=>FSyncInt}))
+        end,
+    HS = try Module:config_changed(Name, HConfig, HandlerState)
+         catch error:undef -> HandlerState
+         end,
+    {noreply, State1#{handler_state => HS}}.
+
 %% If FILESYNC_REPEAT_INTERVAL is set to a millisec value, this
 %% clause gets called repeatedly by the handler. In order to
 %% guarantee that a filesync *always* happens after the last log
 %% event, the repeat operation must be active!
-handle_cast(repeated_filesync,State = #{filesync_repeat_interval := no_repeat}) ->
+handle_info({timeout, TRef, repeated_filesync},
+            State = #{rep_sync_tref := TRef,
+                      filesync_repeat_interval := no_repeat}) ->
     %% This clause handles a race condition which may occur when
     %% config changes filesync_repeat_interval from an integer value
     %% to no_repeat.
     {noreply,State};
-handle_cast(repeated_filesync,
+handle_info({timeout, TRef, repeated_filesync},
             State = #{id := Name,
+                      rep_sync_tref := TRef,
                       module := Module,
                       handler_state := HandlerState,
                       last_op := LastOp}) ->
@@ -282,25 +304,6 @@ handle_cast(repeated_filesync,
                 State#{handler_state => HS, last_op => sync}
         end,
     {noreply,set_repeated_filesync(State1)};
-handle_cast({config_changed, CommonConfig, HConfig},
-            State = #{id := Name,
-                      module := Module,
-                      handler_state := HandlerState,
-                      filesync_repeat_interval := OldFSyncInt}) ->
-    State1 =
-        case maps:get(filesync_repeat_interval,CommonConfig) of
-            OldFSyncInt ->
-                State;
-            FSyncInt ->
-                set_repeated_filesync(
-                  cancel_repeated_filesync(
-                    State#{filesync_repeat_interval=>FSyncInt}))
-        end,
-    HS = try Module:config_changed(Name, HConfig, HandlerState)
-         catch error:undef -> HandlerState
-         end,
-    {noreply, State1#{handler_state => HS}}.
-
 handle_info(Info, #{id := Name, module := Module,
                     handler_state := HandlerState} = State) ->
     {noreply,State#{handler_state => Module:handle_info(Name,Info,HandlerState)}}.
@@ -445,8 +448,7 @@ get_default_config() ->
 
 set_repeated_filesync(#{filesync_repeat_interval:=FSyncInt} = State)
   when is_integer(FSyncInt) ->
-    {ok,TRef} = timer:apply_after(FSyncInt, gen_server, cast,
-                                  [self(),repeated_filesync]),
+    TRef = erlang:start_timer(FSyncInt, self(), repeated_filesync),
     State#{rep_sync_tref=>TRef};
 set_repeated_filesync(State) ->
     State.
@@ -454,7 +456,15 @@ set_repeated_filesync(State) ->
 cancel_repeated_filesync(State) ->
     case maps:take(rep_sync_tref,State) of
         {TRef,State1} ->
-            _ = timer:cancel(TRef),
+            case erlang:cancel_timer(TRef) of
+                false ->
+                    %% Flush the timer message
+                    receive
+                        {timeout, TRef, _} -> ok
+                    end;
+                _ ->
+                    ok
+            end,
             State1;
         error ->
             State
diff --git a/lib/kernel/test/logger_disk_log_h_SUITE.erl b/lib/kernel/test/logger_disk_log_h_SUITE.erl
index a4e4e52309..2c7a43faa7 100644
--- a/lib/kernel/test/logger_disk_log_h_SUITE.erl
+++ b/lib/kernel/test/logger_disk_log_h_SUITE.erl
@@ -656,10 +656,10 @@ sync(Config) ->
     %% switch repeated filesync on and verify that the looping works
     SyncInt = 1000,
     WaitT = 4500,
-    OneSync = {logger_h_common,handle_cast,repeated_filesync},
+    OneSync = {logger_h_common,handle_info,{timeout,repeated_filesync}},
     %% receive 1 repeated_filesync per sec
-    start_tracer([{{logger_h_common,handle_cast,2},
-                   [{[repeated_filesync,'_'],[],[{message,{caller}}]}]}],
+    start_tracer([{{logger_h_common,handle_info,2},
+                   [{[{timeout,'_',repeated_filesync},'_'],[],[{message,{caller}}]}]}],
                  [OneSync || _ <- lists:seq(1, trunc(WaitT/SyncInt))]),
 
     HConfig2 = HConfig#{filesync_repeat_interval => SyncInt},
@@ -1610,13 +1610,16 @@ tpl([{{M,F,A},MS}|Trace]) ->
 tpl([]) ->
     ok.
 
-tracer({trace,_,call,{logger_h_common,handle_cast,[Op|_]},Caller},
+tracer({trace,_,call,{logger_h_common = Mod,handle_cast = Func,[Op|_]},Caller},
        {Pid,[{Mod,Func,Op}|Expected]}) ->
     maybe_tracer_done(Pid,Expected,{Mod,Func,Op},Caller);
 tracer({trace,_,call,{Mod=logger_disk_log_h,Func=disk_log_write,[_,_,Data]},Caller}, {Pid,[{Mod,Func,Data}|Expected]}) ->
     maybe_tracer_done(Pid,Expected,{Mod,Func,Data},Caller);
 tracer({trace,_,call,{Mod,Func,_},Caller}, {Pid,[{Mod,Func}|Expected]}) ->
     maybe_tracer_done(Pid,Expected,{Mod,Func},Caller);
+tracer({trace,_,call,{logger_h_common = Mod,handle_info = Func,[{timeout,_,Op},_S]},Caller},
+       {Pid,[{Mod,Func,{timeout,Op}}|Expected]}) ->
+    maybe_tracer_done(Pid,Expected,{Mod,Func},Caller);
 tracer({trace,_,call,Call,Caller}, {Pid,Expected}) ->
     ct:log("Tracer got unexpected: ~p~nCaller: ~p~nExpected: ~p~n",[Call,Caller,Expected]),
     Pid ! {tracer_got_unexpected,Call,Expected},
diff --git a/lib/kernel/test/logger_std_h_SUITE.erl b/lib/kernel/test/logger_std_h_SUITE.erl
index 08962eec0f..33310e8fad 100644
--- a/lib/kernel/test/logger_std_h_SUITE.erl
+++ b/lib/kernel/test/logger_std_h_SUITE.erl
@@ -817,10 +817,10 @@ sync(Config) ->
     %% switch repeated filesync on and verify that the looping works
     SyncInt = 1000,
     WaitT = 4500,
-    OneSync = {logger_h_common,handle_cast,repeated_filesync},
+    OneSync = {logger_h_common,handle_info,{timeout,repeated_filesync}},
     %% receive 1 repeated_filesync per sec
-    start_tracer([{{logger_h_common,handle_cast,2},
-                   [{[repeated_filesync,'_'],[],[]}]}],
+    start_tracer([{{logger_h_common,handle_info,2},
+                   [{[{timeout,'_',repeated_filesync},'_'],[],[]}]}],
                  [OneSync || _ <- lists:seq(1, trunc(WaitT/SyncInt))]),
 
     ok = logger:update_handler_config(?MODULE, config,
@@ -2182,6 +2182,9 @@ tracer({trace,_,call,{Mod=logger_std_h,Func=write_to_dev,[Data,_]}},
     maybe_tracer_done(Pid,Expected,{Mod,Func,Data});
 tracer({trace,_,call,{Mod,Func,_}}, {Pid,[{Mod,Func}|Expected]}) ->
     maybe_tracer_done(Pid,Expected,{Mod,Func});
+tracer({trace,_,call,{logger_h_common = Mod,handle_info = Func,[{timeout,_,Op},_S]}},
+       {Pid,[{Mod,Func,{timeout,Op}}|Expected]}) ->
+    maybe_tracer_done(Pid,Expected,{Mod,Func});
 tracer({trace,_,call,Call}, {Pid,Expected}) ->
     ct:log("Tracer got unexpected: ~p~nExpected: ~p~n",[Call,Expected]),
     Pid ! {tracer_got_unexpected,Call,Expected},
-- 
2.34.1

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File 0108-logger-Fix-repeated-filesync-shutdown-timeout.patch of Package erlang (Revision 371fc947ce89baa340e0441f200e4667)

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