IJ57234: KERNEL HEAP MEMORY LEAK IN THE FUNCTION VM_WSEG_VMAP_16M_ALLOC

APAR status

• Closed as program error.

Error description

• **************************************************************
  * USERS AFFECTED:
  * Systems running the AIX 7300-04 Technology Level with
  * any of the following filesets at or between the given levels:
  * MIN          MAX          FILESET
  * 7.3.4.0      7.3.4.0      bos.mp64
    **************************************************************
  * ERROR DESCRIPTION:
  *   System memory consumption can be high in kernel heap due
  *   to a memory leak. It can be identified with the following
  *   stack trace:
  *          7528EC .vm_wseg_vmap_16m_alloc+000028
  *           756CE8 .vm_16m_mpss_init@AF215_1+000084
  *           755608 .vms_create_com+0004E4
  *   One can see huge number of pending allocations from the
  *   function .vm_wseg_vmap_16m_alloc+000028
    **************************************************************
  * RECOMMENDATION:
  * Install APAR IJ57234.
  * Prior to fix availability, an interim fix is available from
  * either
  * ftp://aix.software.ibm.com/aix/ifixes/ij56896/
  * https://aix.software.ibm.com/aix/ifixes/ij56896/
  * The ifix can be installed using Live Update (LU).
  * If LU is not used, installation of the ifix requires a
  * reboot.
    **************************************************************
  

Local fix

• N/A
  

Problem summary

•   **************************************************************
  * USERS AFFECTED:
  * Systems running the AIX 7300-04 Technology Level with
  * any of the following filesets at or between the given levels:
  * MIN          MAX          FILESET
  * 7.3.4.0      7.3.4.0      bos.mp64
    **************************************************************
  * ERROR DESCRIPTION:
  *   System memory consumption can be high in kernel heap due
  *   to a memory leak. It can be identified with the following
  *   stack trace:
  *          7528EC .vm_wseg_vmap_16m_alloc+000028
  *           756CE8 .vm_16m_mpss_init@AF215_1+000084
  *           755608 .vms_create_com+0004E4
  *   One can see huge number of pending allocations from the
  *   function .vm_wseg_vmap_16m_alloc+000028
    **************************************************************
  * RECOMMENDATION:
  * Install APAR IJ57234.
  * Prior to fix availability, an interim fix is available from
  * either
  * ftp://aix.software.ibm.com/aix/ifixes/ij56896/
  * https://aix.software.ibm.com/aix/ifixes/ij56896/
  * The ifix can be installed using Live Update (LU).
  * If LU is not used, installation of the ifix requires a
  * reboot.
    **************************************************************
  

Problem conclusion

• Prevents misuse of overloaded members of the vmm unions
  used for multiple interpretations of Segment control block
  extentions
  

Temporary fix

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

Comments

APAR Information

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

  IJ56918

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

Fix information

• Fixed component name

  AIX V7.3

• Fixed component ID

  5765CD300

Applicable component levels