[Tarantool-patches] [PATCH v1] test: fix flaky box/on_shutdown.test.lua on asan

["Alexander V. Tikhonov" <avtikhon@tarantool.org>]

Found that box/on_shutdown.test.lua test fails on asan build with:

  2020-08-26 09:04:06.750 [42629] main/102/on_shutdown [string "_ = box.ctl.on_shutdown(function() log.warn("..."]:1 W> on_shutdown 5
  Starting instance proxy...
  Run console at unix/:/tnt/test/var/001_box/proxy.control
  Start failed: builtin/box/console.lua:865: failed to create server unix/:/tnt/test/var/001_box/proxy.control: Address already in use

It happened on ASAN build, because server stop routine

  test-run/lib/preprocessor.py:TestState.server_stop() ->
    test-run/lib/tarantool_server.py:TarantoolServer.stop()

needs to free the proxy.control socket created by

  test-run/lib/preprocessor.py:TestState.server_start() ->
    tarantoolctl:process_local()

On some builds like ASAN server stop routine needs more time to free
the 'proxy.control' socket. So instead of time delay before server
restart need to use garbage collector to be sure that it will be freed.

Closes #5260
Part of #4360
---

Github: https://github.com/tarantool/tarantool/tree/avtikhon/gh-5260-on-shutdown-test
Issue: https://github.com/tarantool/tarantool/issues/5260
Issue: https://github.com/tarantool/tarantool/issues/4360

 test/box/on_shutdown.result   | 7 ++++++-
 test/box/on_shutdown.skipcond | 7 -------
 test/box/on_shutdown.test.lua | 6 +++++-
 3 files changed, 11 insertions(+), 9 deletions(-)
 delete mode 100644 test/box/on_shutdown.skipcond

diff --git a/test/box/on_shutdown.result b/test/box/on_shutdown.result
index ccbdf45cb..cf5c36c8d 100644
--- a/test/box/on_shutdown.result
+++ b/test/box/on_shutdown.result
@@ -133,8 +133,13 @@ test_run:eval("test", "_ = fiber.new(function() os.exit() while true do end end)
 ---
 - []
 ...
-fiber.sleep(0.1)
+-- On some builds like ASAN server stop routine needs more time to free
+-- the 'proxy.control' socket created by tarantoolctl:process_local(),
+-- check gh-5260. So instead of time delay before server restart need
+-- to use garbage collector to be sure that it will be freed.
+collectgarbage('collect')
 ---
+- 0
 ...
 -- The server should be already stopped by os.exit(),
 -- but start doesn't work without a prior call to stop.
diff --git a/test/box/on_shutdown.skipcond b/test/box/on_shutdown.skipcond
deleted file mode 100644
index e46fd1088..000000000
--- a/test/box/on_shutdown.skipcond
+++ /dev/null
@@ -1,7 +0,0 @@
-import os
-
-# Disabled at ASAN build due to issue #4360.
-if os.getenv("ASAN") == 'ON':
-    self.skip = 1
-
-# vim: set ft=python:
diff --git a/test/box/on_shutdown.test.lua b/test/box/on_shutdown.test.lua
index 2a9143404..5437443b3 100644
--- a/test/box/on_shutdown.test.lua
+++ b/test/box/on_shutdown.test.lua
@@ -54,7 +54,11 @@ test_run:cmd("switch default")
 -- instance to make sure test_run doesn't lose connection to the
 -- shutting down instance.
 test_run:eval("test", "_ = fiber.new(function() os.exit() while true do end end)")
-fiber.sleep(0.1)
+-- On some builds like ASAN server stop routine needs more time to free
+-- the 'proxy.control' socket created by tarantoolctl:process_local(),
+-- check gh-5260. So instead of time delay before server restart need
+-- to use garbage collector to be sure that it will be freed.
+collectgarbage('collect')
 -- The server should be already stopped by os.exit(),
 -- but start doesn't work without a prior call to stop.
 test_run:cmd("stop server test")
-- 
2.17.1