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Openssl crashing when linked against curl(multithreaded setup) in AIX 64 bit platform

From: Arunav Sanyal <>
Date: Mon, 10 Feb 2014 11:33:54 +0530


Openssl is crashing within calls of libcurl. The stack trace for your
reference. :-

sha1-ppc.sha1_block_data_order(??, ??, ??) at 0x9000000125e2b34
sha1dgst.SHA1_Update_at_AF7_3() at 0x9000000125e29f0
m_sha1.update() at 0x9000000125de250
digest.EVP_DigestUpdate() at 0x9000000125d7504
md_rand.ssleay_rand_bytes() at 0x900000012695da4
rand_lib.RAND_bytes() at 0x9000000125c4910
rsa_pk1.RSA_padding_add_PKCS1_type_2() at 0x90000001262238c
rsa_eay.RSA_eay_public_encrypt() at 0x900000012620bc8
rsa_crpt.RSA_public_encrypt() at 0x9000000125e4d90
s3_clnt.ssl3_send_client_key_exchange() at 0x90000001286589c
s3_clnt.ssl3_connect() at 0x900000012869620
ssl_lib.SSL_connect() at 0x90000001282ede0
s23_clnt.ssl23_get_server_hello() at 0x900000012874c58
s23_clnt.ssl23_connect() at 0x900000012875c58
ssl_lib.SSL_connect() at 0x90000001282ede0
ossl_connect_step2() at 0x900000013de7dac
ossl_connect_common() at 0x900000013de59f0
Curl_ssl_connect_nonblocking() at 0x900000013de48e0
https_connecting() at 0x900000013dff89c
Curl_protocol_connecting_at_AF71_46() at 0x900000013de3ab4
multi_runsingle() at 0x900000013dd36a4
curl_multi_perform() at 0x900000013dd5cc4
curl_easy_perform() at 0x900000013e325ec

I am using CURLOPT_NOSIGNAL option as true. No I tried to look for some
answers and found this thread(namely locking_function and threadid_func):-

This gives pointers to examples in Solaris and Win32 examples for certain
callback handlers needed for correct thread safe usage.

Now I didnt browse through curl source but I believe that these callback
handlers must be implemented in curl_global_init(). Is there any other
location I should put these handlers(I mean write the implementation
somewhere?). More importantly, I don't quite understand why curl didn't
handle this in their baseline implementation?

Yours sincerely

Arunav Sanyal
Graduate student
B.E (Hons) Computer Science
BITS Pilani K.K Birla Goa Campus
Software Engineer

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Received on 2014-02-10