ISSUE-7327: 2.6.0 cpp client crash

[sijie]

Original Issue: apache#7327

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Describe the bug
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*To Reproduce

Expected behavior
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Screenshots

call this api, cpp client crash

pulsar_client_create_producer(m_client, topic.c_str(), producer_conf, &producer)

Desktop (please complete the following information):

• OS:linux kernel 4.14.105

Additional context

(gdb) bt
#0 0x00007f8307f4c377 in raise () from /lib64/libc.so.6
#1 0x00007f8307f4da68 in abort () from /lib64/libc.so.6
#2 0x0000000000c7c515 in __gnu_cxx::__verbose_terminate_handler () at ../../../../libstdc++-v3/libsupc++/vterminate.cc:95
#3 0x0000000000c27896 in __cxxabiv1::__terminate (handler=) at ../../../../libstdc++-v3/libsupc++/eh_terminate.cc:38
#4 0x0000000000c278c3 in std::terminate () at ../../../../libstdc++-v3/libsupc++/eh_terminate.cc:48
#5 0x0000000000c6e775 in std::(anonymous namespace)::execute_native_thread_routine (__p=) at ../../../../../libstdc++-v3/src/c++11/thread.cc:92
#6 0x00007f8308d00ea5 in start_thread () from /lib64/libpthread.so.0
#7 0x00007f83080148cd in clone () from /lib64/libc.so.6