- **assigned_to**: Daniel Stenberg
- **Comment**:

Looks like a crash in the Mac's resolver function and not in libcurl. We use the same code for several operating systems and this is the first time we see this.

How come you use such an old libcurl on such a relatively new OS version?

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** [bugs:#1442] intermittent segfault in mdns_query_callback**
**Status:** open
**Created:** Wed Oct 29, 2014 06:03 AM UTC by Puneet Singhal
**Last Updated:** Wed Oct 29, 2014 06:45 AM UTC
**Owner:** Daniel Stenberg
I use libcurl to download some files on the system but seems to be crashing intermittently.
Attaching system info and calling code in the ticket
Crash Stack:
libcurl Version: 7.18.2
OS Version:      Mac OS X 10.9.5 (13F34)
Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT
0   libsystem_info.dylib          	0x00007fff87e2c0eb _mdns_query_callback + 205
1   libsystem_dnssd.dylib         	0x00007fff8b05aec3 handle_query_response + 243
2   libsystem_dnssd.dylib         	0x00007fff8b0593f5 DNSServiceProcessResult + 740
3   libsystem_info.dylib          	0x00007fff87e2adaf _mdns_search + 1300
4   libsystem_info.dylib          	0x00007fff87e3175c mdns_addrinfo + 513
5   libsystem_info.dylib          	0x00007fff87e3152b search_addrinfo + 183
6   libsystem_info.dylib          	0x00007fff87e312c0 si_addrinfo + 1468
7   libsystem_info.dylib          	0x00007fff87e30c5f getaddrinfo + 171
8   libcurl                       	0x000000011099ee96 Curl_getaddrinfo_ex + 37
9   libcurl                       	0x0000000110999740 Curl_getaddrinfo + 264
10  libcurl                       	0x000000011096dcfb Curl_resolv + 309
11  libcurl                       	0x000000011096de02 Curl_resolv_timeout + 123
12  libcurl                       	0x000000011097d3b5 resolve_server + 226
13  libcurl                       	0x000000011097f11c create_conn + 5088
14  libcurl                       	0x0000000110982e8c Curl_connect + 41
15  libcurl                       	0x000000011098e2c3 Curl_do_perform + 137
Calling code:
	CURL *curl = curl_easy_init();
	long longinfo = 400; // BAD REQUEST if we have error on client side
	if(curl) {
		if(mProxy.length())
			curl_easy_setopt(curl,CURLOPT_PROXY, mProxy.c_str());
		StreamCallbackData callbackData;
		callbackData.outputStream = outstream;
		curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
		curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, DataStreamCallback);
#if Macintosh
		//Take care of timeouts as we are setting curl for no signal
		curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L); 
		curl_easy_setopt(curl, CURLOPT_FTP_RESPONSE_TIMEOUT, 20L);
#endif
		// Setting 20 second network timeout
		curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 20L);
		
		// Download speed must not be less than 100b/sec for 10 seconds
		curl_easy_setopt(curl, CURLOPT_LOW_SPEED_LIMIT, 100);
		curl_easy_setopt(curl, CURLOPT_LOW_SPEED_TIME, 10);
		curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&callbackData);
		CURLcode res = curl_easy_perform(curl);
		if(res == 0)
		{
			curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &longinfo);
		}
		curl_easy_cleanup(curl);
		}
	return longinfo; 
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