IZ72440: MEMORY LEAK IN KERNEL WITH NMVT ALERTS QUEUED

Communications Server for AIX, Version 6.3 -- Last PTFs

APAR status

• Closed as program error.

Error description

• Communications Server for AIX and Linux, Version 6
  --------------------------------------------------
  Communications Server logs messages that indicate a memory
  shortage. For example:
  512-63 Not enough memory to activate link.
  512-114 Not enough memory to generate link Alert.
  512-72 Not enough memory for orderly link deactivation
  512-79 Not enough memory to forward Alert
  Snaadmin commands return very slowly or not at all or fail with
  error "cannot allocate memory".
  

Local fix

• Stop and restart the SNA software.
  

Problem summary

• USERS AFFECTED: All
  
  PROBLEM DESCRIPTION:
  The server becomes unusable because the kernel buffer usage has
  gone beyond the maximum (90%) as reported by the command
  "snaadmin query_buffer_availability". Kernel memory usage is
  also elevated.
  
  PROBLEM SUMMARY:
  Following an extended period of waiting for a reconnection to
  the mainframe and a window condition, the product can queue up
  many thousands of NMVT Alerts which are useed to report the
  connectivity failures. These are release if the NMVT PU (the
  first link connected) is deactivated at a later time.
  

Problem conclusion

• The code has been modified to limit this queue to 128 messages.
  This is sufficient for reporting errors, as subsequent events
  occurring while messages can not be transmitted would typically
  be duplicates of the initial failures. These Alerts correspond
  to messages logged in the Communications Server error logs.
  

Temporary fix

• Driver.o
  

Comments

APAR Information

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

  LI75191

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

Fix information

• Fixed component name

  CS AIX V6.X

• Fixed component ID

  5765E5100

Applicable component levels

• R631 PSY U833873

     10/05/19 I 1000

• R640 PSY