IV91019: CRASH IN VIOENT_INIT_LS_TIMER WHEN POLL_UPLINK=YES 16/12/29 PTF PECHANGE

APAR status

• Closed as program error.

Error description

• **************************************************************
  * USERS AFFECTED:
  * Systems running the AIX 7100-04 Technology Level
  * with devices.vdevice.IBM.l-lan.rte at the 7.1.4.30 level.
  **************************************************************
  * PROBLEM DESCRIPTION:
  * On VIO client LPARs using virtual ethernet, if the
  * poll_uplink attribute is set to 'yes' for any virtual
  * ethernet adapter device, the system may crash during reboot
  * after updating to the affected Service Packs listed below.
  *
  * The device attribute can be verified with:
  * # lsattr -El entX -a poll_uplink
  *
  * Please apply the fixes below if updating to the affected
  * Service Packs, before rebooting, to avoid the crash
  * on boot.
  *
  * The crash will show information similar to:
  * Illegal Trap Instruction Interrupt in Kernel
  * vioent_init_ls_timer+000000 tdllti r31,200
  *
  * If this crash is experienced, the system can be recovered
  * by temporarily removing the virtual ethernet device(s) from
  * the LPAR profile and rebooting.  Then the attribute can be
  * unset and the system reactivated with the original profile.
  *
  * The device attribute can be changed with:
  * # chdev -l entX -a poll_uplink=no
  **************************************************************
  * RECOMMENDATION:
  * Install APAR IV91019.
  * Prior to fix availability, an interim fix is available from
  * either
  * ftp://aix.software.ibm.com/aix/ifixes/iv91019/
  * https://aix.software.ibm.com/aix/ifixes/iv91019/
  * Installation of the ifix requires a reboot.
  **************************************************************
  

Local fix

• If this crash is experienced, the system can be recovered
  by temporarily removing the virtual ethernet device(s) from
  the LPAR profile and rebooting.  Then the attribute can be
  unset  and the system reactivated with the original profile.
  .
  The device attribute can be changed with:
  # chdev -l entX -a poll_uplink=no
  

Problem summary

• A compiler option is used with the vioentdd driver to
  instrument a number of runtime checks.  These checks
  are hit regularly by vioent_init_ls_timer(), which is
  executed when poll_uplink=yes.
  

Problem conclusion

• For now remove the compiler option to avoid the asserts.
  

Temporary fix

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

Comments

APAR Information

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

  IV91004

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

  U876091

Fix information

• Fixed component name

  AIX V7.1

• Fixed component ID

  5765H4000

Applicable component levels

• R710 PSY U876091

     UP17/02/08 I 1000 «