PQ60984: GETHOSTBYNAME FAILS WITH ERRNO 121 EINVAL CAUSING ANYNET TO SENDSENSE 80040000 CODE TO NEW SESSIONS, NEW SESSION NOT ESTABLISHED

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When a large number of ANYNET sessions are established, some
  new sessions get a sense 80040000 and new sessions can't be
  established.  This happens because gethostbyname() fails with
  an EINVAL (errno 121).  The select call issued by EZBRERSN
  fails with reason code 11200264 indicating the descriptor list
  passed to select is too short to contain the specified number
  of file descriptors.  The mask is not large enough to contain
  the file descriptor that the socket is using.  The resolver
  trace will show message:
  res_send Sending query to Name Server xx.xx.xx.xx
   BPX1SOC:  RetVal = 0, RC = 0, Reason = 0x00000000
   BPX1STO:  RetVal = 60, RC = 0, Reason = 0x00000000
   BPX1SEL:  RetVal = -1, RC = 121, Reason = 0x11200264
  .
  This will occur for each nameserver defined.
  .
  This is a route of LE APAR PQ60647.
  

Local fix

• Code the names in the local host files.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of the Communications Server for   *
  *                 z/OS Version 1 Release 2 and 4 IP: Resolver  *
  ****************************************************************
  * PROBLEM DESCRIPTION: A gethostbyname failed with an errno    *
  *                      of 121 (EINVAL) during the select       *
  *                      syscall to receive a response from a    *
  *                      domain name server.                     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The application had exceeded the number of defined sockets that
  were available for a select issued by the resolver.
  +-------------------------------------------------------------+
  + Please check our Communications Server for OS/390 homepages +
  + for common networking tips and fixes.  The URL for these    +
  + homepages can be found in Informational APAR II11334.       +
  +-------------------------------------------------------------+
  

Problem conclusion

• The resolver is changed to remove the select call and use
  asynchronous calls to request information from a domain name
  server.
  
  * Cross Reference between External and Internal Names
  

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:

  UQ67008 UQ67009

Modules/Macros

• EZBRECMD EZBREFMT EZBRELST EZBRERSN
  

Fix information

• Fixed component name

  TCP/IP V3 MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R120 PSY UQ67008

     UP02/06/27 P F206

• R140 PSY UQ67009

     UP02/06/27 P F206

Fix is available

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