[tarantool-patches] Re: [PATCH v2 2/2] say: take getaddrinfo() errors into account

[Roman Khabibov <roman.habibov@tarantool.org>]

> On Jul 23, 2019, at 17:52, Alexander Turenko <alexander.turenko@tarantool.org> wrote:
> 
>> @@ -594,6 +594,7 @@ log_syslog_init(struct log *log, const char *init_str)
>> 	log->fd = log_syslog_connect(log);
>> 	if (log->fd < 0) {
>> 		/* syslog indent is freed in atexit(). */
>> +		diag_log();
> 
> 1. It is need to be properly commented: we need to log a diagnostics
> here until stacked diagnostics will be implemented (#1148).
> 
> 2. syslog_connect_unix() does not set a diag, diag_log() will lead to an
> assertion fail.
> 
> 3. I would mention this change in the commit message, because it is not
> part of the problem with Mac OS you described in it.
@@ -506,10 +506,15 @@ syslog_connect_remote(const char *server_address)
 	hints.ai_protocol = IPPROTO_UDP;
 
 	ret = getaddrinfo(remote, portnum, &hints, &inf);
-	if (ret < 0) {
+	if (ret != 0) {
 		errno = EIO;
 		diag_set(SystemError, "getaddrinfo: %s",
 			 gai_strerror(ret));
+		/*
+		 * We need to log a diagnostics here until stacked
+		 * diagnostics will be implemented (#1148).
+		 */
+		diag_log();
 		goto out;
 	}


commit f5b19e933fbf2eb3784a0c3cc28d999a3fa85abe
Author: Roman Khabibov <roman.habibov@tarantool.org>
Date:   Tue Jul 30 15:39:21 2019 +0300

    coio/say: take getaddrinfo() errors into account
    
    Before this patch, branch when getaddrinfo() returns error codes
    couldn't be reached on Mac OS, because they are greater than 0 on
    Mac OS (assumption "rc < 0" in commit ea1da04 is incorrect for
    Mac OS).
    
    * diag log() in say.c was added, because we need to log a
    diagnostics here until stacked diagnostics will be implemented
    (#1148).
    
    Need for #4138

diff --git a/src/lib/core/coio_task.c b/src/lib/core/coio_task.c
index 908b336ed..83f669d05 100644
--- a/src/lib/core/coio_task.c
+++ b/src/lib/core/coio_task.c
@@ -413,7 +413,7 @@ coio_getaddrinfo(const char *host, const char *port,
 		return -1; /* timed out or cancelled */
 
 	/* Task finished */
-	if (task->rc < 0) {
+	if (task->rc != 0) {
 		/* getaddrinfo() failed */
 		errno = EIO;
 		diag_set(SystemError, "getaddrinfo: %s",
diff --git a/src/lib/core/say.c b/src/lib/core/say.c
index 0b2cf2c34..a45595443 100644
--- a/src/lib/core/say.c
+++ b/src/lib/core/say.c
@@ -506,10 +506,15 @@ syslog_connect_remote(const char *server_address)
 	hints.ai_protocol = IPPROTO_UDP;
 
 	ret = getaddrinfo(remote, portnum, &hints, &inf);
-	if (ret < 0) {
+	if (ret != 0) {
 		errno = EIO;
 		diag_set(SystemError, "getaddrinfo: %s",
 			 gai_strerror(ret));
+		/*
+		 * We need to log a diagnostics here until stacked
+		 * diagnostics will be implemented (#1148).
+		 */
+		diag_log();
 		goto out;
 	}
 	for (ptr = inf; ptr; ptr = ptr->ai_next) {
diff --git a/test/box-tap/cfg.test.lua b/test/box-tap/cfg.test.lua
index 55de5e41c..d92e9140d 100755
--- a/test/box-tap/cfg.test.lua
+++ b/test/box-tap/cfg.test.lua
@@ -6,7 +6,7 @@ local socket = require('socket')
 local fio = require('fio')
 local uuid = require('uuid')
 local msgpack = require('msgpack')
-test:plan(104)
+test:plan(105)
 
 --------------------------------------------------------------------------------
 -- Invalid values
@@ -566,6 +566,23 @@ os.exit(0)
 ]]
 test:is(run_script(code), 0, "log_nonblock")
 
+--
+-- gh-4138: check getaddrinfo() error and panic after that.
+--
+code=[[
+local socket = require('socket')
+local log = require('log')
+local fio = require('fio')
+
+path = fio.pathjoin(fio.cwd(), 'log_unix_socket_test.sock')
+unix_socket = socket('AF_UNIX', 'SOCK_DGRAM', 0)
+unix_socket:bind('unix/', path)
+
+opt = string.format("syslog:server=non_exists_hostname:%s,identity=tarantool", path)
+box.cfg{log = opt, log_nonblock=true}
+]]
+test:is(run_script(code), PANIC, "log_nonblock")
+
 --
 -- Crash (instead of panic) when trying to recover a huge tuple.
 --
diff --git a/test/unit/coio.cc b/test/unit/coio.cc
index bb8bd7131..a70d3254d 100644
--- a/test/unit/coio.cc
+++ b/test/unit/coio.cc
@@ -72,7 +72,7 @@ static void
 test_getaddrinfo(void)
 {
 	header();
-	plan(1);
+	plan(3);
 	const char *host = "127.0.0.1";
 	const char *port = "3333";
 	struct addrinfo *i;
@@ -81,6 +81,12 @@ test_getaddrinfo(void)
 	is(rc, 0, "getaddrinfo");
 	freeaddrinfo(i);
 
+	/* gh-4138: Check getaddrinfo() error. */
+	isnt(coio_getaddrinfo("non_exists_hostname", port, NULL, &i, 1), 0,
+	     "getaddrinfo error");
+	isnt(strstr(diag_get()->last->errmsg, "getaddrinfo"), NULL,
+	     "getaddrinfo error message");
+
 	/*
 	 * gh-4209: 0 timeout should not be a special value and
 	 * detach a task. Before a fix it led to segfault
diff --git a/test/unit/coio.result b/test/unit/coio.result
index 5019fa48a..49759b747 100644
--- a/test/unit/coio.result
+++ b/test/unit/coio.result
@@ -7,6 +7,8 @@
 # call done with res 0
 	*** test_call_f: done ***
 	*** test_getaddrinfo ***
-1..1
+1..3
 ok 1 - getaddrinfo
+ok 2 - getaddrinfo error
+ok 3 - getaddrinfo error message
 	*** test_getaddrinfo: done ***