PH37819: SERVER LOOPING OR S0C4 ABEND IS POSSIBLE IF THE CONNECTION IS CLOSED WHILE SENDING A LARGE AMOUNT OF DATA

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• This issue can occur if the amount of data sent by the server
  exceeds the size of the socket's write buffer, and the client
  closes the connection at this point. The server may then go
  into a loop, or the following two abends may happen:
  Traceback:
  
  DSA   Entry       E  Offset  Statement   Load Mod      Program
  Unit                   Service  Status
  1     CEEHDSP     +00004A54              CEEPLPKA      CEEHDSP
                        HLE77C0  Call
  2     CEEHRNUH    +0000009A              CEEPLPKA      CEEHRNUH
                        HLE77C0  Call
  3     CSelect::Select(std::set,std::a
  +00000406              ARYXNNET
               Exception
  4     CServer::ProcessEvents()
  +00000150              ARYVSRV
               Call
  5     CServer::Run()
  +00000436              ARYVSRV
               Call
  6     ServerThreadFunction(void*)
  +0000001C              ARYYSRV
               Call
  7     CThread::Proxy(void*)
  +00000030              ARYXPPSX
               Call
  8     CEEVROND    +0000127C              CEEPLPKA
                                 Call
  9     CEEOPCMM    +00000986              CEEBINIT     CEEOPCMM
                        HLE77C0  Call
  Traceback:
  
  DSA   Entry       E  Offset  Statement   Load Mod     Program
  Unit                   Service  Status
  1     CEEHDSP     +00004A54              CEEPLPKA     CEEHDSP
                        HLE77C0  Call
  2     CEEHRNUH    +0000009A              CEEPLPKA     CEEHRNUH
                        HLE77C0  Call
  3     std::_Tree,st
  +00000010              ARYXNNET
               Exception
  4     std::_Tree,st
  +0000015E              ARYXNNET
               Call
  5     CSelect::DeleteReadSocket(CSocket*)
  +00000014              ARYXNNET
               Call
  6     CServer::CleanupSessionSocket(CSocket*)
  +0000001A              ARYVSRV
               Call
  7     CServerSessionInfo::Close()
  +0000008C              ARYVSRV
               Call
  8     CServerSessionInfo::Send(std::vector)
  +0000011E              ARYVSRV
               Call
  14    CServer::SessionThreadFun(void*)
  +000000C0              ARYVSRV
               Call
  15    CThread::Proxy(void*)
  +00000030              ARYXPPSX
               Call
  16    CEEVROND    +0000127C              CEEPLPKA
                                 Call
  17    CEEOPCMM    +00000986              CEEBINIT
  CEEOPCMM
                        HLE77C0  Call
  

Local fix

Problem summary

• SOC4 abend in server can occur if the amount of data sent by the
  server exceeds the size of the socket's write buffer, and the
  client closes the connection at this point.
  

Problem conclusion

• RESOLVED IN COREQUISITE PTF's UI76676/UI76678/UI76679.
  
  ****************************************************************
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  DB2 REC EXPERT

• Fixed component ID

  5697H7400

Applicable component levels

• R320 PSY UI76676

     UP21/08/14 P F108

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.