File 5672-kernel-Fix-group-to-not-crash-if-group_his... of Package erlang

Overview Repositories Revisions Requests Users Attributes Meta

File 5672-kernel-Fix-group-to-not-crash-if-group_history-fails.patch of Package erlang (Revision 49da028e0b4201ec59b5016936cec596)

Currently displaying revision 49da028e0b4201ec59b5016936cec596 , Show latest

From 172a15ce1d13efe256a3d93b6ef279e59cdcf481 Mon Sep 17 00:00:00 2001
From: Lukas Larsson <lukas@erlang.org>
Date: Tue, 23 Apr 2024 21:14:04 +0200
Subject: [PATCH 2/2] kernel: Fix group to not crash if group_history fails

There used to be a bug where the AC would block and set_env
would crash. This caused the shell to be unuseable as it crashed
all the time. So we add some safe guards to make sure that does
not happen again.
---
 lib/kernel/src/group.erl         | 9 ++++++++-
 lib/kernel/src/group_history.erl | 5 ++++-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/kernel/src/group.erl b/lib/kernel/src/group.erl
index 44ac1c4097..1792ffe2fb 100644
--- a/lib/kernel/src/group.erl
+++ b/lib/kernel/src/group.erl
@@ -19,6 +19,8 @@
 %%
 -module(group).
 
+-include_lib("kernel/include/logger.hrl").
+
 %% A group leader process for user io.
 
 -export([start/2, start/3, server/3]).
@@ -1005,7 +1007,12 @@ save_line_buffer("\n", Lines) ->
 save_line_buffer(Line, [Line|_Lines]=Lines) ->
     save_line_buffer(Lines);
 save_line_buffer(Line, Lines) ->
-    group_history:add(Line),
+    try
+        group_history:add(Line)
+    catch E:R:ST ->
+            ?LOG_ERROR(#{ msg => "Failed to write to shell history",
+                          error => {E, R, ST} })
+    end,
     save_line_buffer([Line|Lines]).
 
 save_line_buffer(Lines) ->
diff --git a/lib/kernel/src/group_history.erl b/lib/kernel/src/group_history.erl
index 7738a2155e..f770a85a90 100644
--- a/lib/kernel/src/group_history.erl
+++ b/lib/kernel/src/group_history.erl
@@ -374,7 +374,10 @@ find_path() ->
 to_drop() ->
     case application:get_env(kernel, shell_history_drop) of
         undefined ->
-            application:set_env(kernel, shell_history_drop, ?DEFAULT_DROP),
+            %% The AC might be overloaded/not responding and
+            %% we want the shell to be as responsive as possible
+            %% so we set a short timeout
+            application:set_env(kernel, shell_history_drop, ?DEFAULT_DROP, [{timeout, 10}]),
             ?DEFAULT_DROP;
         {ok, V} when is_list(V) -> [Ln++"\n" || Ln <- V];
         {ok, _} -> ?DEFAULT_DROP
-- 
2.35.3

Places

File 5672-kernel-Fix-group-to-not-crash-if-group_history-fails.patch of Package erlang (Revision 49da028e0b4201ec59b5016936cec596)

Places