IV53104: CRASH IN V_PFEND_FSEG_PGOUT WHILE VMM IS PROCESSING NFS PAGE

APAR status

• Closed as program error.

Error description

• **************************************************************
  * USERS AFFECTED:
  * Systems running the 5300-12 Technology Level with
  * bos.mp below the 5.3.12.9 level and bos.mp64 below the
  * 5.3.12.9 level.
  **************************************************************
  * PROBLEM DESCRIPTION:
  * Customers running NFS could see a system crash on an NFS
  * client, while VMM is processing pageout of an NFS page.
  * The crash stack will be similar to:
  *     (0)> f
  *     pvthread+000C00 STACK:
  *     ￭00022080abend_trap+000000 ()
  *     ￭00343DECv_pfend_fseg_pgout+00086C ()
  *     ￭003467B8v_pfend_fseg+000518 ()
  *     ￭0034A19Cv_pfend_com+00053C ()
  *     ￭00394510v_vtiol_dequeue+000190 ()
  *     ￭000717A8begfst+000128 ()
  **************************************************************
  * RECOMMENDATION:
  * Install APAR IV53104.
  **************************************************************
  

Local fix

• System will reboot. No workaround
  

Problem summary

• **************************************************************
  * USERS AFFECTED:
  * Systems running the 5300-12 Technology Level with
  * bos.mp below the 5.3.12.9 level and bos.mp64 below the
  * 5.3.12.9 level.
  **************************************************************
  * PROBLEM DESCRIPTION:
  * Customers running NFS could see a system crash on an NFS
  * client, while VMM is processing pageout of an NFS page.
  * The crash stack will be similar to:
  *     (0)> f
  *     pvthread+000C00 STACK:
  *      00022080 abend_trap+000000 ()
  *      00343DEC v_pfend_fseg_pgout+00086C ()
  *      003467B8 v_pfend_fseg+000518 ()
  *      0034A19C v_pfend_com+00053C ()
  *      00394510 v_vtiol_dequeue+000190 ()
  *      000717A8 begfst+000128 ()
  **************************************************************
  * RECOMMENDATION:
  * Install APAR IV53104.
  **************************************************************
  

Problem conclusion

• Change the VMM NFS client gather pages routine to not gather
  both COMMIT and ASYNC page requests in the same stuct bufx I/O.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

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

  IV44039

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

Fix information

• Fixed component name

  AIX 5.3 EXT SUP

• Fixed component ID

  5765G0399

Applicable component levels

• R53E PSY

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