IY61508: 64BIT APPLICATION GIVES ERROR/HANG WITH NIS+

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APAR status

• Closed as program error.

Error description

• When 64bit application is using NIS+ for accessing
  password information its getting process hang due
  to looping or simply error msg. For the hang behavior
  he can see "clnt_dg_create out of memory" errors in
  the syslog Log file. Looping is observed when "ulimit -n"
  value is set to 'unlimited'.
  

Local fix

• Setting "ulimit -n" to 32768 helps to overcome process
  looping behavior.
  

Problem summary

• If "ulimit -n" is set to unlimited then 64bit applicaiton
  will hang while using NIS+ for password information.
  The hung process will have following dbx output:
  
  (dbx) where
  _sigsetmask(??, ??, ??) at 0x90000000022a95c
  sigthreadmask(??, ??, ??) at 0x90000000022b844
  thr_sigsetmask(??, ??, ??) at 0x90000000026c80c
  unlockExclusive__14NisMappedCacheFP8sigset_t(??, ??) at
  0x900000000293d6c
  lockShared__14NisMappedCacheFP8sigset_t(??, ??) at
  0x900000000293f04
  __ct__14NisMappedCacheFR9nis_errori(??, ??, ??) at
  0x900000000293630
  __ct__14NisClientCacheFR9nis_error(??, ??) at
  0x9000000002924ac
  __nis_CacheInit(??) at 0x900000000290584
  __nis_CacheRefreshAddress(??) at 0x9000000002914e4
  nis_handle(??, ??, ??, ??) at 0x9000000002b5e04
  __nis_get_server(??) at 0x9000000002b72a4
  __nis_remote_lookup(??, ??, ??, ??, ??) at 0x9000000002ba2d0
  nis_list(??, ??, ??, ??) at 0x90000000028e654
  __nis_list_localcb(??, ??, ??, ??) at 0x90000000028bb2c
  nisplus_getpwuid(??) at 0x90000000020d2e8
  _getpwuid_shadow_r(??, ??, ??, ??, ??) at 0x90000000008f1b0
  getpwuid(??) at 0x900000000092e08
  main(0x200000002, 0xffffffffffffaa0) at 0x100000468
  
  You can see lots of occurance of following message: syslog
  root@hope:/etc/> cat syslog.err | grep "syslog: clnt_dg_create
                   : out of memory" | wc -l
        56
  

Problem conclusion

• Correction in the RPC authentication for 64bit application.
  Correction to check whether "ulmit -n" is unlimited for 64bit
  application as well.
  

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:

  IY61608

Fix information

• Fixed component name

  AIX 5L FOR POWE

• Fixed component ID

  5765E6100

Applicable component levels

• R510 PSY U499130

     UP04/10/29 I 1000