CODEWITHSUNDEEP
c++memory-leakspoco-libraries
Martin Fuller
Martin Fuller

Reputation: 23

Memory keeps growing

I'm pretty sure that this Poco part of the library is not leaking, but also I can't figure it out why the memory keeps increasing.

If I let this program to run for half a minute, the ram memory increase by more than 10MB, starting from less than one.

#include "Poco/Net/SSLManager.h"
    int main(int argc, const char * argv[])
    {
        int counter = 0;
        while(counter < 1000000)
        {
            Poco::Net::Context::Ptr context = new Poco::Net::Context(Poco::Net::Context::CLIENT_USE, "", "", "", Poco::Net::Context::VERIFY_NONE, 9, false, "ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH");
            counter++;
        }

        return 0;
    }

I set a breakpoint to see if the object is deleted and it does;

inline void RefCountedObject::release() const
{
    if (--_counter == 0) delete this;
}

The code above is from class Foundation_API RefCountedObject which is used by the context.

I spent almost two days trying to understand why the memory keeps increasing. Testing with Valgrind, it says that it does leak memory, but nobody mention about this on the internet.

Compiled and run on Ubuntu and Mac os x too, the same problem.

Thank you.

Later edit: By running valgrind --leak-check=yes ./exec on mac os x, below is the output:

==808== Memcheck, a memory error detector
==808== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==808== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==808== Command: ./exec
==808== 
--808-- ./exec:
--808-- dSYM directory is missing; consider using --dsymutil=yes
--808-- /Users/myusername/bla/local/blaStream/blaStream/Libraries/libjson_linux-gcc-4.2.1_libmt.dylib:
--808-- dSYM directory is missing; consider using --dsymutil=yes
--808-- /Users/myusername/bla/local/blaStream/blaStream/Libraries/libboost_system-mt.dylib:
--808-- dSYM directory is missing; consider using --dsymutil=yes
--808-- /Users/myusername/bla/local/blaStream/blaStream/Libraries/libboost_thread-mt.dylib:
--808-- dSYM directory is missing; consider using --dsymutil=yes
UNKNOWN __pthread_sigmask is unsupported. This warning will not be repeated.
==808== 
==808== HEAP SUMMARY:
==808==     in use at exit: 72,981 bytes in 1,029 blocks
==808==   total heap usage: 305,673 allocs, 304,644 frees, 11,304,653 bytes allocated
==808== 
==808== 72 (32 direct, 40 indirect) bytes in 1 blocks are definitely lost in loss record 73 of 131
==808==    at 0x47F1: malloc (vg_replace_malloc.c:300)
==808==    by 0x8294F3: CRYPTO_malloc (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x80BEDB: sk_new_null (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x81EE87: engine_cleanup_add_last (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x7FFD4E: ENGINE_add (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x87FF55: ENGINE_load_dynamic (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x83180C: OPENSSL_config (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x1152669: Poco::Crypto::OpenSSLInitializer::initialize() (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoCrypto.16.dylib)
==808==    by 0xFC6DE: Poco::Net::Context::Context(Poco::Net::Context::Usage, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, Poco::Net::Context::VerificationMode, int, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoNetSSL.16.dylib)
==808==    by 0xFC67F: Poco::Net::Context::Context(Poco::Net::Context::Usage, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, Poco::Net::Context::VerificationMode, int, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoNetSSL.16.dylib)
==808==    by 0x100027ADB: main (in ./exec)
==808== 
==808== 904 (176 direct, 728 indirect) bytes in 1 blocks are definitely lost in loss record 100 of 131
==808==    at 0x47F1: malloc (vg_replace_malloc.c:300)
==808==    by 0x8294F3: CRYPTO_malloc (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x825CE5: lh_new (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x83AAC2: def_get_class (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x83A4E8: int_new_ex_data (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x81EBFE: ENGINE_new (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x87FEBA: ENGINE_load_dynamic (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x83180C: OPENSSL_config (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x1152669: Poco::Crypto::OpenSSLInitializer::initialize() (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoCrypto.16.dylib)
==808==    by 0xFC6DE: Poco::Net::Context::Context(Poco::Net::Context::Usage, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, Poco::Net::Context::VerificationMode, int, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoNetSSL.16.dylib)
==808==    by 0xFC67F: Poco::Net::Context::Context(Poco::Net::Context::Usage, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, Poco::Net::Context::VerificationMode, int, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoNetSSL.16.dylib)
==808==    by 0x100027ADB: main (in ./exec)
==808== 
==808== 1,536 (176 direct, 1,360 indirect) bytes in 1 blocks are definitely lost in loss record 119 of 131
==808==    at 0x47F1: malloc (vg_replace_malloc.c:300)
==808==    by 0x8294F3: CRYPTO_malloc (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x825CE5: lh_new (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x87E33D: int_thread_get (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x87E54A: int_thread_set_item (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x87DE34: ERR_get_state (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x85DF4B: ERR_clear_error (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x83180C: OPENSSL_config (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x1152669: Poco::Crypto::OpenSSLInitializer::initialize() (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoCrypto.16.dylib)
==808==    by 0xFC6DE: Poco::Net::Context::Context(Poco::Net::Context::Usage, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, Poco::Net::Context::VerificationMode, int, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoNetSSL.16.dylib)
==808==    by 0xFC67F: Poco::Net::Context::Context(Poco::Net::Context::Usage, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, Poco::Net::Context::VerificationMode, int, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoNetSSL.16.dylib)
==808==    by 0x100027ADB: main (in ./exec)
==808== 
==808== 2,048 bytes in 1 blocks are definitely lost in loss record 120 of 131
==808==    at 0x51C7: calloc (vg_replace_malloc.c:627)
==808==    by 0xC9100A: strerror (in /usr/lib/system/libsystem_c.dylib)
==808==    by 0x853C87: ERR_load_ERR_strings (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x872388: ERR_load_crypto_strings (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x7C5DC8: SSL_load_error_strings (in /usr/lib/libssl.0.9.8.dylib)
==808==    by 0x1152673: Poco::Crypto::OpenSSLInitializer::initialize() (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoCrypto.16.dylib)
==808==    by 0xFC6DE: Poco::Net::Context::Context(Poco::Net::Context::Usage, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, Poco::Net::Context::VerificationMode, int, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoNetSSL.16.dylib)
==808==    by 0xFC67F: Poco::Net::Context::Context(Poco::Net::Context::Usage, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, Poco::Net::Context::VerificationMode, int, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoNetSSL.16.dylib)
==808==    by 0x100027ADB: main (in ./exec)
==808== 
==808== 21,728 (32 direct, 21,696 indirect) bytes in 1 blocks are definitely lost in loss record 131 of 131
==808==    at 0x47F1: malloc (vg_replace_malloc.c:300)
==808==    by 0x8294F3: CRYPTO_malloc (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x80BEDB: sk_new_null (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x867092: CONF_module_add (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x82C5C8: OPENSSL_load_builtin_modules (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x831807: OPENSSL_config (in /usr/lib/libcrypto.0.9.8.dylib)
==808==    by 0x1152669: Poco::Crypto::OpenSSLInitializer::initialize() (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoCrypto.16.dylib)
==808==    by 0xFC6DE: Poco::Net::Context::Context(Poco::Net::Context::Usage, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, Poco::Net::Context::VerificationMode, int, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoNetSSL.16.dylib)
==808==    by 0xFC67F: Poco::Net::Context::Context(Poco::Net::Context::Usage, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, Poco::Net::Context::VerificationMode, int, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) (in /usr/local/Cellar/poco/1.4.6p4-all/lib/libPocoNetSSL.16.dylib)
==808==    by 0x100027ADB: main (in ./exec)
==808== 
==808== LEAK SUMMARY:
==808==    definitely lost: 2,464 bytes in 5 blocks
==808==    indirectly lost: 33,184 bytes in 639 blocks
==808==      possibly lost: 0 bytes in 0 blocks
==808==    still reachable: 264 bytes in 3 blocks
==808==         suppressed: 37,069 bytes in 382 blocks
==808== Reachable blocks (those to which a pointer was found) are not shown.

Upvotes: 2

Views: 890

Answers (1)

Alex
Alex

Reputation: 5320

Likely due to this issue; fix will be in 1.6.0

Upvotes: 1

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