SEGV on unknown address 0x000000000060

[wanghaEMQ]

Describe the bug

Connecting to server ...
connect_cb: connected!
AddressSanitizer:DEADLYSIGNAL
=================================================================
==222475==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000060 (pc 0x7faaa4cb1d54 bp 0x7ffc95ec4fa0 sp 0x7ffc95ec4f98 T0)
==222475==The signal is caused by a READ memory access.
==222475==Hint: address points to the zero page.
    #0 0x7faaa4cb1d54 in pthread_mutex_lock@@GLIBC_2.2.5 (/lib64/libc.so.6+0x8fd54) (BuildId: c9f62793b9e886eb1b95077d4f26fe2b4aa1ac25)
    #1 0x4295d8 in nni_plat_mtx_lock (/home/wangha/Documents/nftp-nanosdk/build/nftp_serv+0x4295d8) (BuildId: 9ac92bbf5fbfc4b88a650e98d43cfe9f97ff7c29)
    #2 0x427765 in nni_task_busy (/home/wangha/Documents/nftp-nanosdk/build/nftp_serv+0x427765) (BuildId: 9ac92bbf5fbfc4b88a650e98d43cfe9f97ff7c29)
    #3 0x42d31c in nng_mqtt_subscribe_async (/home/wangha/Documents/nftp-nanosdk/build/nftp_serv+0x42d31c) (BuildId: 9ac92bbf5fbfc4b88a650e98d43cfe9f97ff7c29)
    #4 0x417faa in main /home/wangha/Documents/nftp-nanosdk/nftp_serv.c:338
    #5 0x7faaa4c49b89 in __libc_start_call_main (/lib64/libc.so.6+0x27b89) (BuildId: c9f62793b9e886eb1b95077d4f26fe2b4aa1ac25)
    #6 0x7faaa4c49c4a in __libc_start_main_alias_2 (/lib64/libc.so.6+0x27c4a) (BuildId: c9f62793b9e886eb1b95077d4f26fe2b4aa1ac25)
    #7 0x416994 in _start (/home/wangha/Documents/nftp-nanosdk/build/nftp_serv+0x416994) (BuildId: 9ac92bbf5fbfc4b88a650e98d43cfe9f97ff7c29)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/lib64/libc.so.6+0x8fd54) (BuildId: c9f62793b9e886eb1b95077d4f26fe2b4aa1ac25) in pthread_mutex_lock@@GLIBC_2.2.5
==222475==ABORTING

To Reproduce
Build with this. https://github.com/wanghaEMQ/nftp-nanosdk/tree/bug

** Environment Details **

• NanoSDK/NNG version. latest
• Operating system and version. fedora38
• Compiler and language used. gcc
• Shared or static library. shared
• Remote MQTT Broker info. nanomq-latest
• Messaging scenario