diff --git a/release_notes/ocp-4-7-release-notes.adoc b/release_notes/ocp-4-7-release-notes.adoc index 7f925509021e..22c16d7e9127 100644 --- a/release_notes/ocp-4-7-release-notes.adoc +++ b/release_notes/ocp-4-7-release-notes.adoc @@ -2043,9 +2043,13 @@ $ oc patch route/canary -n openshift-ingress-canary -p '{"spec":{"tls":{"termina + (link:https://bugzilla.redhat.com/show_bug.cgi?id=1932401[*BZ#1932401*]) -* Updates to openvswitch ("net: openvswitch: reorder masks array based on usage") code causes the openvswitch et/openvswitch/flow_table::flow_lookup accessing per-cpu data condition on preemptible (and migratable) sections, leading to a real time kernel panic. As a result, the kernel-rt is unstable and will impact low latency applications. +* Updates to openvswitch ("net: openvswitch: reorder masks array based on usage") code, causes the openvswitch et/openvswitch/flow_table::flow_lookup accessing per-cpu data condition on preemptible (and migratable) sections, leading to a real time kernel panic. As a result, the kernel-rt is unstable and will impact low latency applications. + -It is recommended not to upgrade to {product-title} 4.7 until this is fixed. +Customers who are using the kernel-rt and run either {product-title} 4.6 or 4.7.0 will experience a severe impact. ++ +The impact is continuous. For example, if the customer is using the Precision Time Protocol (PTP), the daemon is unstable and the protocol faults every minute. A stable time synchronization is never achieved. ++ +There is no remediation currently available. + (link:https://bugzilla.redhat.com/show_bug.cgi?id=1918456[*BZ#1918456*])