PM91258: TIMEOUT ERRORS USING VARIOUS TCP SOCKET BASED ADAPTERS (FTP, HTTP, EMAIL, SOCKET, SHELL & SSL) ON THE LINUX PLATFORM.

APAR status

• Closed as program error.

Error description

• "Timeout in seconds" errors received using the IBM WebSphere TX
  FTP adapter on the Linux platform.
  
  Traces may show a 20 or 40 second gap between an operation where
  the adapter has requested information from the client, and the
  timeout occurs.
  
  Here are two examples:
  
  00:46:08.863 17392:1477010368 Socket Opened.
  00:46:08.863 17392:1477010368 Connection attempt is in progress.
  00:46:08.863 17392:1477010368 Connected.
  00:46:28.867 17392:1477010368 WSARecvDTX: Operation has timed
  out.
  00:46:28.867 17392:1477010368    Timeout in seconds: 0.
  00:46:28.867 17392:1477010368 Warning! This server did not send
  a proper greeting.
  
  
  00:28:01.381 28295:1587983296 Connected.
  00:28:01.381 28295:1587983296 <NLST *INPUT*.xml
  00:28:01.383 28295:1587983296 >150 Here comes the directory
  listing. (S)
  00:28:41.378 28295:1587983296 WSARecvDTX: Operation has timed
  out.
  00:28:41.378 28295:1587983296    Timeout in seconds: 0.
  00:28:41.378 28295:1587983296 Socket Closed.
  
  
  Other WTX TCP socket based adapters are also affected.
  

Local fix

• WTXCQ - WTX00043180
          WTX00043213
          WTX00043214
          WTX00043215
  PB / PB
  Circumvention: The retry option can be used to attempt to
  alleviate the issue, but the more concurrent operations that are
  attempted, the more likely the failure is to occur.
  

Problem summary

• Users Affected:
  WebSphere Transformation Extender customers who use FTP, Shell,
  HTTP or Socket utility adapters on Linux
  
  
  Problem Description:
  The WTX FTP, HTTP and Socket adapters introduces memory
  corruption when attempting to FTP a file with a socket
  descriptor that is above 1024.
  Shell adapter fails or hangs to execute a shell script if the
  number of opened file descriptors is more than 1024 on Linux
  
  Platforms Affected:
  Linux, zLinux
  

Problem conclusion

• When running on Linux, the FTP, HTTP, and E-mail adapters use
  the socket-based "poll" API function to query socket activity.
  Before this fix, the "select" call was used, which introduced
  corruption if the socket descriptor value exceeded the
  FD_SETSIZE value. FD_SETSIZE is 1024 on Linux
  
  Delivered in:
  8.4.0.4, 8.4.1.1
  

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

  WTX FOR INT SER

• Fixed component ID

  5724M4010

Applicable component levels

• R840 PSY

     UP

• R841 PSY

     UP