Hi,

shared memory not freed once TLS connection close means shm available memory decreasing for new connection that leads to the following error
tls: ssl bug #1491 workaround: not enough memory for safe operation

TestCase:

1. start kamailio

2. use sample program to establish tls connection and close imediately.

3. Kamailio Log is

    For first TLS connection
    tls [tls_server.c:189]: tls_complete_init(): tls: enough memory for safe operation: shm=63604096 threshold1=12058624
    tls [tls_server.c:649]: tls_h_tcpconn_clean(): tls shm_available after shm_free: 63545192

     For second TLS connection
     tls [tls_server.c:189]: tls_complete_init(): tls: enough memory for safe operation: shm=63545192 threshold1=12058624
     tls [tls_server.c:649]: tls_h_tcpconn_clean(): tls shm_available after shm_free: 63489352

Memory Leak:

for tls connection connection

63604096 - 63545192 = 58904 bytes not freed.

for tls connection connection

63545192 - 63489352 = 55840 bytes not freed.

I tested same scenario on kamailio - 4.2.4, 4.3.4 versions result is same.

Could you please provide the fix?

Thanks & Regards,

Raja Chegondi.