[Live-devel] Infinite recusion on live555MediaServer

[易先生]

Hello,  i'm working on a HP laptop and my OS is ubuntu 19.10, my live555 version is live.2019.09.18.tar.gz.
I found a infinite recursion when debugging RTSP DESCRIBE on live555MediaServer, and the call stack is:
Thread #1 [live555MediaSer] 12995 [core: 1] (Suspended : Breakpoint)    
    DynamicRTSPServer::lookupServerMediaSession() at DynamicRTSPServer.cpp:54 0x555555576ae4    
    GenericMediaServer::removeServerMediaSession() at GenericMediaServer.cpp:58 0x555555577f3f    
    GenericMediaServer::addServerMediaSession() at GenericMediaServer.cpp:35 0x555555577eba    
    DynamicRTSPServer::lookupServerMediaSession() at DynamicRTSPServer.cpp:76 0x555555576dc3    
    GenericMediaServer::removeServerMediaSession() at GenericMediaServer.cpp:58 0x555555577f3f    
    GenericMediaServer::addServerMediaSession() at GenericMediaServer.cpp:35 0x555555577eba    
    DynamicRTSPServer::lookupServerMediaSession() at DynamicRTSPServer.cpp:76 0x555555576dc3    
    RTSPServer::RTSPClientConnection::handleCmd_DESCRIBE() at RTSPServer.cpp:334 0x55555557b2ca    
    RTSPServer::RTSPClientConnection::handleRequestBytes() at RTSPServer.cpp:761 0x55555557a392    
    GenericMediaServer::ClientConnection::incomingRequestHandler() at GenericMediaServer.cpp:248 0x5555555785d7    
    <...more frames...>    
-----------------------------------------------------------------------------
In function "DynamicRTSPServer::lookupServerMediaSession", it calls function "DynamicRTSPServer::addServerMediaSession" and in this function it call DynamicRTSPServer::lookupServerMeidaSession again............and the infinite recursion came.
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