Hi Daniel,

I got the following update from one more CURL users who is also facing the same problem.
Please see below the statement:
xiaoqing [xiaoqing001_at_users.sf.net]
The same problem has appeared several times in my environment(Curl version:7.32.0 ),the information of stack is the same of the Dushyant's, hang in Curl_poll->poll. Currently there is no solution or circumvent this problem? Thank you very much!

Are we planning to fix this problem in future releases.

Thanks and Regards
Dushyant

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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:** Tue Nov 05, 2013 09:18 AM 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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