IV36311: COMPUTE NODES HANGS EVEN AFTER SERVICE NODE RECOVERS FROM HANG. APPLIES TO AIX 7100-02

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Customer diskless workstation has STNFS root.  System
  hung when the NFS server went down, with one thread
  having the following stack trace:
  (0)> f 4168
  pvthread+104800 STACK:
  [000E0FC0]e_block_thread+000280 ()
  [00014F50].kernel_add_gate_cstack+000030 ()
  [F1000000C0221F00]_csq_acquire+0001E0 (??, ??)
  [F1000000C022143C]mult_sqh_acquire+00015C (??)
  [F1000000C022D428]osr_open+0000C8 (??)
  [F1000000C022DED0]pse_open+0002B0 (??, ??, ??, ??)
  [00014D70].hkey_legacy_gate+00004C ()
  [00705544]conopen+000264 (??, ??, ??, ??)
  [00594B40]devcopen+000480 (??, ??, ??, ??, ??)
  [0059458C]fp_opendev+0001EC (??, ??, ??, ??, ??)
  [00014F50].kernel_add_gate_cstack+000030 ()
  [05B8F8A8]console_printf+000228 (0000000005D65BE8,
     F1000A09804F6880, 0000000000000000, 0000000000480239,
     0000000000480239, 0000000000000000,
     0000000000000002, F00000002FF47600)
  [05BA1698]rfscall_progvers+000598
     (??, ??, ??, ??, ??, ??, ??, ??)
  [05BA1D58]rfs3call+0000D8
     (??, ??, ??, ??, ??, ??, ??, ??)
  [05CEEE08]nfs3setattr+000168 (??, ??, ??, ??)
  [05CEA550]nfs3_setattr+0000B0 (??, ??, ??, ??)
  [05B9458C]aix2onc_setattr+00024C
     (??, ??, ??, ??, ??, ??)
  [005C0128]vnop_setattr+000308 (??, ??, ??, ??, ??, ??)
  [005C0128]vnop_setattr+000308 (??, ??, ??, ??, ??, ??)
  [0077C17C]spec_setattr+00021C (??, ??, ??, ??, ??, ??)
  [005C0128]vnop_setattr+000308 (??, ??, ??, ??, ??, ??)
  [00014F50].kernel_add_gate_cstack+000030 ()
  [F1000000C03C57FC]pty_vsetattr+00011C
     (??, ??, ??, ??, ??, ??)
  [F1000000C03C5C70]pty_setname+0000F0
     (??, ??, ??, ??, ??, ??)
  [F1000000C03BBEC0]pty_create_ptp+0003A0
     (??, ??, ??, ??, ??)
  [F1000000C03BB8A4]pty_open_comm+0006E4 (??, ??, ??, ??)
  [F1000000C03BA4AC]call_pty_open_comm+00018C
     (??, ??, ??, ??)
  [F1000000C03C5280]ptm_open+0001E0 (??, ??, ??, ??, ??)
  [F1000000C0230908]open_wrapper+000108 (??)
  [F1000000C02224B0]csq_protect+0003B0
     (??, ??, ??, ??, ??, ??)
  [F1000000C022D448]osr_open+0000E8 (??)
  [F1000000C0243054]pse_clone_open+0003D4 (??, ??, ??, ??)
  [00014D70].hkey_legacy_gate+00004C ()
  [0065C180]spec_clone+0000E0 (??, ??, ??, ??, ??)
  [0065888C]openpnp+00094C (??, ??, ??, ??, ??, ??, ??, ??)
  [00658CEC]openpath+00028C (??, ??, ??, ??, ??, ??, ??,
  ??)
  [006590B4]copen+000314 (FFFFFFFEFFFFFFFE,
     0000000020000608, 0000000000000002, 2FF22FF82FF22FF8,
     0000000000000000, F00000002FF47580)
  [00657EC4]kopen+000024 (??, ??, ??)
  

Local fix

• Mount the root file system using NFS, not STNFS.
  

Problem summary

• Diskless client hung when the NFS server is down
  

Problem conclusion

• Code is modified to synchronize the locking process
  

Temporary fix

Comments

• 6100-06 - use AIX APAR IV36345
  6100-07 - use AIX APAR IV36326
  6100-08 - use AIX APAR IV36296
  7100-02 - use AIX APAR IV36311
  

APAR Information

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

  IV33092

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

Fix information

• Fixed component name

  AIX V7.1

• Fixed component ID

  5765H4000

Applicable component levels

• R710 PSY U852698

     UP13/02/18 I 1000

PTF to Fileset Mapping

• U852698 bos.rte.tty 7.1.2.15