File 0161-Make-sure-that-asynchronous-replies-are-not-lost.patch of Package erlang

From 23f132d9ab776ab94c29f1faed76c9fde8f4a73f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Mon, 29 May 2017 14:41:14 +0200
Subject: [PATCH 1/2] Make sure that asynchronous replies are not lost

If an synchronous GC was requested by calling:

     erlang:garbage_collect(Pid, [{async,Ref}])

the reply message could in certain circumstances be
lost.

The problem is in cleanup_sys_tasks() in erl_process.c.
If there were at least one dirty task, only the first
dirty task would be cleaned up. All other systems tasks
would not be cleaned up (that is, no replies would be
sent to other processes waiting for the tasks to finish).
---
 erts/emulator/beam/erl_process.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index 7952e3031..0575729bb 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -11331,7 +11331,9 @@ cleanup_sys_tasks(Process *c_p, erts_aint32_t in_state, int in_reds)
     erts_aint32_t state = in_state;
     int max_reds = in_reds;
     int reds = 0;
-    int qmask = 0;
+    int qmask = 1;          /* Set to 1 to force looping as long as there
+                             * are dirty tasks.
+                             */
 
     ERTS_SMP_LC_ASSERT(erts_proc_lc_my_proc_locks(c_p) == ERTS_PROC_LOCK_MAIN);
 
-- 
2.13.0