Guys,

Knowing where the bug was introduced is not always very helpful. What's helpful now is a way for _others_ to repeat the problem and I closed this report simply because you still have not provided any such recipe and it is really hard for us to chase down problems we cannot reproduce.

And if you can reproduce the problem in your own custom app but not in a smaller stand-alone that you can provide to us, then I suggest you start instrumenting the code or sprinkle it with printf/infof calls or whatever to get some hints about when and when not this situation occurs.

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** [bugs:#1285] libcurl 7.32 stuck in the mid of communication with re-used HTTPS connection**
**Status:** closed-invalid
**Created:** Thu Sep 26, 2013 01:03 PM UTC by Dushyant chaudhary
**Last Updated:** Thu Nov 28, 2013 03:41 PM UTC
**Owner:** Daniel Stenberg
Hi,
We are from unity Connection Team which is a voice mail solution.For Unified messaging our system uses the Curl for Synching the messages from this system to outside clients(like Exchange Servers).
Unity connection subscribes 400 users by making the use of curl library and  sends the request out to exchange servers.
While sending connection make the reuse of the curl sessions being made originally.
We have single thread that continuosly sends out the request out to CURL for 400 users subscription.
But for the case of SSL ,CURL stucks in between the communication and doesnot send the request to exchange server.
We have some time out mechanism for 30 seconds in which Unity Connection times out ,if curl doesnot send request and respond back ,that is why we are  continuosly get the timeout erors at our side.
We were earlier using 7.22 in which things are working fine 
Also with 7.23 and 7.23.1 everything works fine
But for 7.24 till 7.32 Curl version releases we are getting these errors
we did some search on the CURL site ,and observed that there were some bug fixes done related to max ssl sessions and SHAREDSESSIONLOCK 
 
we have tracked these changes in your source code at path lib
1)lib/url.c
2)lib/sslgen.c
3)lib/ssluse.c
we also took the gcore for the process and we are able to see the curl stucks in the following stack
Following flow where thread got blocked in CURL:
Thread 17 (Thread 0x6547b70 (LWP 10819)):
#0  0x00e01430 in __kernel_vsyscall ()
#1  0x00f6cca6 in poll () from /lib/libc.so.6
#2  0x00d54487 in Curl_poll () from /opt/cisco/connection/lib/libcurl_cisco.so.4
#3  0x00d4fa0c in curl_multi_wait () from /opt/cisco/connection/lib/libcurl_cisco.so.4
#4  0x00d499bc in curl_easy_perform () from /opt/cisco/connection/lib/libcurl_cisco.so.4
#5  0x0022ce95 in CCsHttpRequest::Submit(long&, TCsAutoArray<char>&, unsigned int&) () from /opt/cisco/connection/lib/libCsHttp.so
#6  0x0022aebb in CCsHttpRequest::Submit(long&, ICsString&) () from /opt/cisco/connection/lib/libCsHttp.so
#7  0x00272591 in CCsEwsClient::makeHttpRequest(CCsString const&, CCsString const&, TCsAutoPtr<xercesc_2_7::SAX2XMLReader>&, CCsString const&, std::vector<CCsString, std::allocator<CCsString> >&, long&, CCsEwsCapture*, CCsString*) () from /opt/cisco/connection/lib/libCsEws.so
#8  0x0027343e in CCsEwsClient::doCmd(xercesc_2_7::ContentHandler&, CCsString const&, CCsString const&, ICsString&, CCsEwsCapture*) () from /opt/cisco/connection/lib/libCsEws.so
#9  0x00271740 in CCsEwsClient::doCmd(xercesc_2_7::ContentHandler&, CCsString const&, ICsString&, CCsEwsCapture*) () from /opt/cisco/connection/lib/libCsEws.so
#10 0x002715c0 in CCsEwsClient::doCmd(xercesc_2_7::ContentHandler&, CCsString const&, ICsString&) () from /opt/cisco/connection/lib/libCsEws.so
I would request to analyze this issue for SSL whereas for non SSL everything works fine
Thanks and Regards
Dushyant
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