IT27669: MESSAGE FLOWS WITH SFTP TRANPORT ENABLED FILE NODES CAN HANG/INDEFINITELY WAIT ON SOCKET READ CALLS.

APAR status

• Closed as program error.

Error description

• Message flows with sftp enabled file node can indefinitely wait
  on socket read calls instead of throwing a
  java.net.SocketTimeoutException. This causes a hang situation
  for the message flow even if a non zero timeoutSec property
  value is configured.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of IBM App Connect Enterprise V11.0 and IBM
  Integration Bus V10.0 using File nodes with SFTP transport.
  
  
  Platforms affected:
  z/OS, MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  Message flows containing an sftp enabled file node can
  indefinitely wait on socket read calls instead of throwing a
  java.net.SocketTimeoutException. This causes execution to hang
  for the message flow even if a non zero timeoutSec property
  value is configured.
  
  A java core taken at the time of issue shows following call
  stack for the hanging thread.
  
  at java/lang/Object.wait(Native Method)
  at java/lang/Object.wait(Object.java:218(Compiled Code))
  at
  java/io/PipedInputStream.read(PipedInputStream.java:337(Compiled
   Code))
     (entered lock:
  com/jcraft/jsch/Channel$MyPipedInputStream@0x00000000FDF20B60,
  entry count: 2)
  at
  java/io/PipedInputStream.read(PipedInputStream.java:388(Compiled
   Code))
     (entered lock:
  com/jcraft/jsch/Channel$MyPipedInputStream@0x00000000FDF20B60,
  entry count: 1)
  at
  com/jcraft/jsch/ChannelSftp.fill(ChannelSftp.java:2909(Compiled
  Code))
  at
  com/jcraft/jsch/ChannelSftp.header(ChannelSftp.java:2935(Compile
  d Code))
  at
  com/jcraft/jsch/ChannelSftp.start(ChannelSftp.java:262(Compiled
  Code))
  at com/jcraft/jsch/Channel.connect(Channel.java:152(Compiled
  Code))
  at
  com/ibm/broker/remote/sftp/SFTPService.open(SFTPService.java:103
  9(Compiled Code))
     (entered lock: com/jcraft/jsch/JSch@0x00000000F0409190, entry
  count: 1)
     (entered lock:
  com/ibm/broker/remote/sftp/SFTPService@0x00000000F04405C8, entry
  count: 2)
  at
  com/ibm/broker/remote/sftp/SFTPService.open(SFTPService.java:347
  (Compiled Code))
  at
  com/ibm/broker/remote/sftp/SFTPService.reopen(SFTPService.java:3
  99(Compiled Code))
     (entered lock:
  com/ibm/broker/remote/sftp/SFTPService@0x00000000F04405C8, entry
  count: 1)
  at
  com/ibm/broker/remote/RemoteFileManager.refreshList(RemoteFileMa
  nager.java:205(Compiled Code))
     (entered lock: java/lang/Object@0x00000000F09E06D0, entry
  count: 1)
     (entered lock:
  com/ibm/broker/remote/sftp/SftpFileManager@0x00000000F09DFFB8,
  entry count: 1)
  at
  com/ibm/broker/remote/RemoteFileManager.doRemoteFileTransfer(Rem
  oteFileManager.java:432(Compiled Code))
  at
  com/ibm/broker/nodes/filenodes/AbstractFileInputNode.transferFro
  mRemoteServer(AbstractFileInputNode.java:1551(Compiled Code))
  at
  com/ibm/broker/nodes/filenodes/AbstractFileInputNode.getNextFile
  (AbstractFileInputNode.java:953(Compiled Code))
  at
  com/ibm/broker/nodes/filenodes/AbstractFileInputNode.readData(Ab
  stractFileInputNode.java:1126(Compiled Code))
  

Problem conclusion

• The file nodes now throw an exception instead of indefinitely
  waiting on the Socket read call.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v10.0      10.0.0.16
  v11.0      11.0.0.4
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

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

  INTEGRATION BUS

• Fixed component ID

  5724J0540

Applicable component levels