sandro-qiang

some more information. before crash [2023-11-06 13:10:57.366][WARN][1][j498ff67][0] DTLS: SSL3 alert method=read type=warning, desc=CN(close notify), where=16388, ret=256, r1=0 [2023-11-06 13:10:57.366][INFO][1][j498ff67] RTC: session destroy by DTLS alert(warning CN), username=0r8phna1:Tplr [2023-11-06 13:10:57.366][INFO][1][j498ff67] RTC:...

Base on the srs source, I suggest check `sendonly_skt_ != NULL` in `SrsRtcTcpNetwork::write` and do `SrsRtcTcpNetwork::update_sendonly_socket(NULL)` in `SrsRtcTcpConn::on_before_dispose`.

another crash ``` [2023-11-06 14:13:14.550][INFO][1][hi69qz68] RTC: disposing #0 resource(RtcConn)(0x61d000002880), conns=49, disposing=4, zombies=0 [2023-11-06 14:13:14.550][INFO][1][098og308] RTC: disposing #1 resource(RtcConn)(0x61d0000f0080), conns=48, disposing=4, zombies=0 [2023-11-06 14:13:14.550][INFO][1][aui07865] RTC: disposing #2 resource(RtcConn)(0x61d0000dc080), conns=47, disposing=4, zombies=0...

more crash ``` [2023-12-21 02:33:06.636][WARN][1][l74f1r35][11] RTC: Drop for ssrc 3670442919 not found [2023-12-21 02:33:06.636][WARN][1][eg12jp3i][11] RTC: Drop for ssrc 3670442919 not found [2023-12-21 02:33:06.637][WARN][1][70q44376][11] RTC: Drop for ssrc 836709604 not found...