IT43691: MFT PBA ABENDs with IndexOutOfBoundException if SFTP server returns a filesize of -1

APAR status

• Closed as program error.

Error description

• A Managed File Transfer (MFT) protocol bridge agent (PBA) is
  connecting to a file server using the SFTP protocol and acting
  as the source agent for a managed transfer. When querying the
  size of the source file, the file server returns a value of -1.
  This results in an java.lang.IndexOutOfBoundsException being
  created, which causes the agent to shut down and generate an
  ABEND file containing a stack similar to the following:
  
  Thread:   30 (FileIOWorker-0:0)
  Class:   com.ibm.wmqfte.thread.FTEThread
  Instance:  6565fd2b
  Method:   uncaughtException
  Probe:   ABEND_001
  Cause:   java.lang.IndexOutOfBoundsException
  java.lang.IndexOutOfBoundsException
      at java.nio.ByteBuffer.wrap(ByteBuffer.java:375)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferChunkImpl.getByteBuff
  er(TransferChunkImpl.java:192)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferChunkImpl.createFileS
  lice(TransferChunkImpl.java:346)
      at
  com.ibm.wmqfte.io.bridge.BridgeFileChannelImpl.newSlice(BridgeFi
  leChannelImpl.java:1137)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferFrameSenderImpl.reque
  stChunk(TransferFrameSenderImpl.java:692)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferFrameSenderImpl.acces
  s$000(TransferFrameSenderImpl.java:104)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferFrameSenderImpl$Chunk
  Requester.processFileIORequest(TransferFrameSenderImpl.java:146)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferFrameIOWorker.doWorkI
  mpl(TransferFrameIOWorker.java:318)
      at
  com.ibm.wmqfte.io.impl.FTEFileIOWorker.doWork(FTEFileIOWorker.ja
  va:118)
      at
  com.ibm.wmqfte.io.impl.FTEFileIORequestQueue.run(FTEFileIOReques
  tQueue.java:274)
      at java.lang.Thread.run(Thread.java:825)
      at com.ibm.wmqfte.thread.FTEThread.run(FTEThread.java:70)
  
  Restarting the agent may cause it to resume the transfer and
  encounter the same issue, resulting in it shutting down again.
  

Local fix

• If you can identify the transfer ID of the transfer causing the
  exception, you can cancel it using the fteCancelTransfer
  command.  This may allow the agent to stay active.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This issue affects users of MQ Managed File Transfer (MFT), who
  have protocol bridge agents (PBA) that act as the source agent
  for managed transfers.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  When an MQ Managed File Transfer (MFT) protocol bridge agent
  (PBA) is acting as the source agent for a managed transfer, it
  will send a request to the remote file server to get various
  attributes about the file it has been asked to transfer. It then
  uses the file size attribute to determine how much data it needs
  to read from the remote file server.
  
  If the file server returned a file size of -1,. then the agent
  would try to create an internal buffer with a size of -1 to
  store the file data. This attempt would result in an
  java.lang.IndexOutOfBoundsException being thrown, which caused
  the agent to generate an ABEND file containing information
  similar to the example shown below:
  
  Thread:   30 (FileIOWorker-0:0)
  Class:   com.ibm.wmqfte.thread.FTEThread
  Instance:  6565fd2b
  Method:   uncaughtException
  Probe:   ABEND_001
  Cause:   java.lang.IndexOutOfBoundsException
  java.lang.IndexOutOfBoundsException
      at java.nio.ByteBuffer.wrap(ByteBuffer.java:375)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferChunkImpl.getByteBuff
  er(TransferChunkImpl.java:192)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferChunkImpl.createFileS
  lice(TransferChunkImpl.java:346)
      at
  com.ibm.wmqfte.io.bridge.BridgeFileChannelImpl.newSlice(BridgeFi
  leChannelImpl.java:1137)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferFrameSenderImpl.reque
  stChunk(TransferFrameSenderImpl.java:692)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferFrameSenderImpl.acces
  s$000(TransferFrameSenderImpl.java:104)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferFrameSenderImpl$Chunk
  Requester.processFileIORequest(TransferFrameSenderImpl.java:146)
      at
  com.ibm.wmqfte.transfer.frame.impl.TransferFrameIOWorker.doWorkI
  mpl(TransferFrameIOWorker.java:318)
      at
  com.ibm.wmqfte.io.impl.FTEFileIOWorker.doWork(FTEFileIOWorker.ja
  va:118)
      at
  com.ibm.wmqfte.io.impl.FTEFileIORequestQueue.run(FTEFileIOReques
  tQueue.java:274)
      at java.lang.Thread.run(Thread.java:825)
      at com.ibm.wmqfte.thread.FTEThread.run(FTEThread.java:70)
  
  The agent would then shut itself down.
  

Problem conclusion

• To resolve this issue, MQ Managed File Transfer (MFT protocol
  bridge agents (PBA) have been changed to fail a managed transfer
  if the remote file server returns a file size less than zero for
  a source file. The managed transfer will fail with the following
  error:
  
  BFGIO0417E: The file server returned an invalid file size of
  <file size> for the source file '<source file name>''.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v9.3 LTS   9.3.0.10
  v9.x CD    9.3.4
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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

  MQ BASE V9.2

• Fixed component ID

  5724H7281

Applicable component levels