File 0222-erts-Fix-bug-in-systask-scheduling.patch of Package erlang
From d563fdd7f3bfa5df218e3965ca45a0348514a2a7 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Mon, 6 Nov 2017 17:59:28 +0100
Subject: [PATCH] erts: Fix bug in systask scheduling
when request id is an immediate.
Ex:
erlang:garbage_collect(P, [{async,Immediate}]).
may crash the VM.
---
erts/emulator/beam/erl_process.c | 2 +-
erts/emulator/test/process_SUITE.erl | 13 ++++++++++---
2 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index b4b97d7df1..fd02f10540 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -9824,7 +9824,7 @@ erts_internal_request_system_task_3(BIF_ALIST_3)
goto badarg;
req_type = tp[1];
req_id = tp[2];
- req_id_sz = is_immed(req_id) ? req_id : size_object(req_id);
+ req_id_sz = is_immed(req_id) ? 0 : size_object(req_id);
tot_sz = req_id_sz;
for (i = 0; i < ERTS_MAX_PROC_SYS_TASK_ARGS; i++) {
int tix = 3 + i;
diff --git a/erts/emulator/test/process_SUITE.erl b/erts/emulator/test/process_SUITE.erl
index bf31655066..932d0f87f1 100644
--- a/erts/emulator/test/process_SUITE.erl
+++ b/erts/emulator/test/process_SUITE.erl
@@ -2365,8 +2365,13 @@ system_task_on_suspended(Config) when is_list(Config) ->
end.
gc_request_when_gc_disabled(Config) when is_list(Config) ->
- Master = self(),
AIS = erts_debug:set_internal_state(available_internal_state, true),
+ gc_request_when_gc_disabled_do(ref),
+ gc_request_when_gc_disabled_do(immed),
+ erts_debug:set_internal_state(available_internal_state, AIS).
+
+gc_request_when_gc_disabled_do(ReqIdType) ->
+ Master = self(),
{P, M} = spawn_opt(fun () ->
true = erts_debug:set_internal_state(gc_state,
false),
@@ -2378,7 +2383,10 @@ gc_request_when_gc_disabled(Config) when is_list(Config) ->
receive after 100 -> ok end
end, [monitor, link]),
receive {P, gc_state, false} -> ok end,
- ReqId = make_ref(),
+ ReqId = case ReqIdType of
+ ref -> make_ref();
+ immed -> immed
+ end,
async = garbage_collect(P, [{async, ReqId}]),
receive
{garbage_collect, ReqId, Result} ->
@@ -2387,7 +2395,6 @@ gc_request_when_gc_disabled(Config) when is_list(Config) ->
ok
end,
receive {garbage_collect, ReqId, true} -> ok end,
- erts_debug:set_internal_state(available_internal_state, AIS),
receive {'DOWN', M, process, P, _Reason} -> ok end,
ok.
--
2.15.1