I have added the CURLOPT_NOSIGNAL option and stress-tested it for 12 hours.It runs stable now.
Many thanks,Ferdinand
   
   From: Ray Satiro via curl-library <curl-library_at_cool.haxx.se>
 To: curl-library_at_cool.haxx.se
Cc: Ray Satiro <raysatiro_at_yahoo.com>
 Sent: Saturday, October 8, 2016 5:03 PM
 Subject: Re: http client easy interface - crashes under load
  
 On 10/8/2016 4:39 PM, Ferdinand de Boevere via curl-library wrote:
 
 Running the tool with 100 connections/threads (a.out 100) causes it to crash after 3 seconds: The web server does not return anything relevant here since authentication is missing from the request.
  
  The core file shows the following stack trace:
  Core was generated by `./a.out 100'.
 Program terminated with signal 11, Segmentation fault.
 #0  0x000000000042e132 in addbyter (output=110, data=0x2b733e615170) at mprintf.c:976
 976         infop->buffer[0] = outc; /* store */
 (gdb)
 (gdb) bt
 #0  0x000000000042e132 in addbyter (output=110, data=0x2b733e615170) at mprintf.c:976
 #1  0x000000000042d048 in dprintf_formatf (data=0x2b733e615170, stream=0x42e0f9 <addbyter>,
     format=0x45ff5c "name lookup timed out", ap_save=0x2b733e6151c0) at mprintf.c:624
 #2  0x000000000042e1b7 in curl_mvsnprintf (buffer=0xdb3357 <Address 0xdb3357 out of bounds>, maxlength=16384,
     format=0x45ff5c "name lookup timed out", ap_save=0x2b733e6151c0) at mprintf.c:994
 #3  0x0000000000419f85 in Curl_failf (data=0xdb2a4f, fmt=0x45ff5c "name lookup timed out") at sendf.c:234
 #4  0x000000000040e3d5 in Curl_resolv_timeout (conn=0x2b733e6153c0, hostname=0x0, port=59, entry=0x46045a, timeoutms=4588634)
     at hostip.c:619
 #5  0x000000000d3b6e00 in ?? ()
 #6  0x00002b733e617000 in ?? ()
 #7  0x00002b732aaaaaab in ?? ()
 #8  0x0000000000000000 in ?? ()
 
 Looks familiar [1]. Please review libcurl thread safety [2], it sounds like you need to set CURLOPT_NOSIGNAL [3].
 
 
 [1]: https://github.com/curl/curl/issues/1003
 [2]: https://curl.haxx.se/libcurl/c/threadsafe.html
 [3]: https://curl.haxx.se/libcurl/c/CURLOPT_NOSIGNAL.html
 
 
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Received on 2016-10-09