IV54522: INAPPROPRIATE IOCTL CALL CAUSING KERNEL LOG ERRORS

IBM Tivoli Network Manager IP 3.9.0 Fix Pack 4, 3.9.0-TIV-ITNMIP-FP0004
IBM Tivoli Network Manager IP Edition 3.9.0 Fix Pack 5, 3.9.0-TIV-ITNMIP-FP0005

APAR status

• Closed as program error.

Error description

• v3.9 - Linux (Observed on SuSE 11-SP1) , applicable for
  fp1,fp2 & fp3.
  
  Thousands of following errors were logged to /var/log/messages
  during discovery by ncp_d_helpserv, ncp_disco, ncp_df_*
  ncp_agent processes and also by ncp_virtualdomain irrespective
  of the discovery status.
  
  <snip>
  2013 Oct 20 16:00:10 fcis760 kern.warning kernel: [26194.116876]
   ioctl32(ncp_disco:13862): Unknown cmd fd(17)
  cmd(00005301){t:'S';sz:0} arg(f4372148) on socket:[631484]
  2013 Oct 20 16:00:10 fcis760 kern.warning kernel: [26194.118632]
  ioctl32(ncp_df_file:26225): Unknown cmd fd(15)
  cmd(00005301){t:'S';sz:0} arg(f5578148) on socket:[631483]
  
  </snip>
  
  The errors can cause system to run out of disk space and other
  issues.
  
  Note: The problem isn't consistent and only observed on one
  server even though other servers are on same Kernel version.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Users in Linux platform                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Thousands of following errors were logged to                 *
  * /var/log/messages                                            *
  * during discovery by ncp_d_helpserv, ncp_disco, ncp_df_*      *
  * ncp_agent processes and also by ncp_virtualdomain            *
  * irrespective                                                 *
  * of the discovery status.                                     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * fix pack | 3.9.0-ITNMIP-FP0004                               *
  *                                                              *
  * The following fixpacks will contain the fix:                 *
  * | fix pack | 3.9.0-ITNMIP-FP0004                             *
  * | fix pack | 4.1.0-ITNMIP-FP0001                             *
  ****************************************************************
  

Problem conclusion

• It looks like the I_NREAD system ioctl is causing the errors to
  appear.
   The function tries to determine how much data is available to
  be read on a socket.
  If it can't get an answer then it defaults to 1024.  Modify
  RivIoctl_PktLen so that it uses
   FIONREAD instead again for Linux version.
  

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

  NC/PREC DISCOVY

• Fixed component ID

  5724O52DS

Applicable component levels

• R390 PSN

     UP

• R390 PSY

     UP

• R410 PSN

     UP

• R410 PSY

     UP