Right, there's no surprise that a different SSL backend works around the problem since the crash was obviously within the darinssl specific code.

In order to track this down, we would really like to know what curl options you set and I got a set of more questions from a fellow libcurl hacker:

1. Is the user authenticating with the server using a PKCS#12 (.p12) file?

2. If so, can that user send me a sample P12 file so I can see what's going on? This feature did work for me when I last tested it using a home-made security identity in a P12 file.

3. If not, is the user authenticating using any other type of file, e.g. PEM or DER? The darwinssl code doesn't support that because Apple won't open up the function to build an identity from a PEM or DER and private key file.

---
** [bugs:#1369] curl crashes with segmentation fault in httpd in use with PHP**
**Status:** open
**Labels:** DarwinSSL 
**Created:** Thu May 08, 2014 03:30 PM UTC by Marco Lehmann
**Last Updated:** Fri May 09, 2014 06:20 AM UTC
**Owner:** Daniel Stenberg
curl 7.36.0 (x86_64-apple-darwin13.1.0) libcurl/7.36.0 SecureTransport zlib/1.2.5
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smtp smtps telnet tftp 
Features: IPv6 Largefile NTLM NTLM_WB SSL libz
~~~~~~
Process 26863 stopped
* thread #1: tid = 0x226200, 0x00007fff91faf452 CoreFoundation`CFArrayGetValueAtIndex + 114, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
    frame #0: 0x00007fff91faf452 CoreFoundation`CFArrayGetValueAtIndex + 114
CoreFoundation`CFArrayGetValueAtIndex + 114:
-> 0x7fff91faf452:  movq   (%rax), %rcx
   0x7fff91faf455:  leaq   0x10(%rax,%rcx,8), %rbx
   0x7fff91faf45a:  jmp    0x7fff91faf49c            ; CFArrayGetValueAtIndex + 188
   0x7fff91faf45c:  movq   -0x15f07b03(%rip), %rax   ; { /usr/lib/libobjc.A.dylib`objc_msgSend_fixedup, "objectAtIndex:" }
(lldb) bt
* thread #1: tid = 0x226200, 0x00007fff91faf452 CoreFoundation`CFArrayGetValueAtIndex + 114, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)
  * frame #0: 0x00007fff91faf452 CoreFoundation`CFArrayGetValueAtIndex + 114
    frame #1: 0x00000001006eebb8 libcurl.4.dylib`darwinssl_connect_common + 1571
    frame #2: 0x00000001006ede55 libcurl.4.dylib`Curl_ssl_connect_nonblocking + 36
    frame #3: 0x00000001006ba725 libcurl.4.dylib`Curl_http_connect + 77
    frame #4: 0x00000001006c8263 libcurl.4.dylib`Curl_protocol_connect + 129
    frame #5: 0x00000001006d89d0 libcurl.4.dylib`multi_runsingle + 732
    frame #6: 0x00000001006d8661 libcurl.4.dylib`curl_multi_perform + 168
    frame #7: 0x00000001006d2f5d libcurl.4.dylib`curl_easy_perform + 338
    frame #8: 0x0000000102902ea0 libphp5.so`zif_curl_exec + 128
    frame #9: 0x0000000102c34417 libphp5.so`zend_do_fcall_common_helper_SPEC + 1799
    frame #10: 0x0000000102be9bb1 libphp5.so`execute + 678
    frame #11: 0x0000000102bba1d8 libphp5.so`zend_call_function + 1922
    frame #12: 0x0000000102aad882 libphp5.so`zif_call_user_func_array + 102
    frame #13: 0x0000000102c34417 libphp5.so`zend_do_fcall_common_helper_SPEC + 1799
    frame #14: 0x0000000102be9bb1 libphp5.so`execute + 678
    frame #15: 0x0000000102bc6a61 libphp5.so`zend_execute_scripts + 515
    frame #16: 0x0000000102b6e121 libphp5.so`php_execute_script + 796
    frame #17: 0x0000000102c561d0 libphp5.so`php_handler + 1145
    frame #18: 0x000000010000351d httpd`ap_run_handler + 65
    frame #19: 0x000000010000396a httpd`ap_invoke_handler + 244
    frame #20: 0x0000000100030919 httpd`ap_process_async_request + 895
    frame #21: 0x00000001000309c0 httpd`ap_process_request + 25
    frame #22: 0x000000010002d972 httpd`ap_process_http_connection + 161
    frame #23: 0x0000000100011e49 httpd`ap_run_process_connection + 65
    frame #24: 0x0000000100037581 httpd`child_main + 923
    frame #25: 0x00000001000370bb httpd`make_child + 378
    frame #26: 0x0000000100036479 httpd`prefork_run + 1040
    frame #27: 0x0000000100013bb9 httpd`ap_run_mpm + 82
    frame #28: 0x000000010000a178 httpd`main + 2304
~~~~~~
---
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