[El-errata] New Ksplice updates for UEKR4 4.1.12 on OL6 and OL7 (ELBA-2018-4252)

[Errata Announcements for Oracle Linux]

Synopsis: ELBA-2018-4252 can now be patched using Ksplice

Users with Oracle Linux Premier Support can now use Ksplice to patch
against the latest Oracle Linux Bug Fix Advisory, ELBA-2018-4252.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack running UEKR4 4.1.12 on
OL6 and OL7 install these updates.

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.

Alternatively, you can install these updates by running:

# /usr/sbin/uptrack-upgrade -y


DESCRIPTION

* Performance degradation with IBRS on sibling threads.

Incorrect IBRS disabling logic could result in a performance degradation
when a thread entered the idle loop with IBRS enabled.  This could cause
the sibling thread to suffer reduced performance.

Orabug: 28782729

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.