Virtuozzo ReadyKernel patch 123.0 for Virtuozzo Hybrid Server 7.0, 7.5, Virtuozzo Infrastructure Platform 3.0, and Virtuozzo Hybrid Infrastructure 3.5, 4.0

Issue date: 2021-03-02

Applies to: Virtuozzo Hybrid Infrastructure 3.5, Virtuozzo Hybrid Infrastructure 4.0, Virtuozzo Hybrid Server 7.0, Virtuozzo Hybrid Server 7.5, Virtuozzo Infrastructure Platform 3.0

Virtuozzo Advisory ID: VZA-2021-011

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with stability fixes. The patch applies to all supported kernels of Virtuozzo Hybrid Server 7, Virtuozzo Infrastructure Platform, and Virtuozzo Hybrid Infrastructure.

2. Bug Fixes

  • [3.10.0-1127.18.2.vz7.163.46] The number of memory cgroups reached its limit because such cgroups were not deleted in certain cases. It was discovered that memory cgroups were not deleted in certain cases. Over time, the limit on the number of memory cgroups could be hit and new cgroups would not be created. As a result, containers could fail to start and would report ‘Cannot allocate memory’ errors, docker could fail to run in the containers too, etc. (PSBM-126014)

  • [3.10.0-957.12.2.vz7.96.21 to 3.10.0-1127.18.2.vz7.163.46] Virtual machines could not start in certain cases due to incorrect detection of CPU feature ‘IBPB’. (PSBM-126136)

3. Installing the Update

Download, install, and immediately apply the patch to the current kernel by running ‘readykernel update’.