Kernel update: Virtuozzo ReadyKernel patch 44.0 for Virtuozzo 7.0.6 and 7.0.6 HF3

Issue date: 2018-02-22

Applies to: Virtuozzo 7.0

Virtuozzo Advisory ID: VZA-2018-010

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with stability fixes. The patch applies to Virtuozzo kernels 3.10.0-693.1.1.vz7.37.30 (Virtuozzo 7.0.6) and 3.10.0-693.11.6.vz7.40.4 (Virtuozzo 7.0.6 HF3).

2. Bug Fixes

  • Hard lockups happened when the kernel was processing SAK (Secure Attention Key). (PSBM-80340)

  • Memory cgroups were not correctly released during start/stop of containers with Docker. If the node had a significant amount of such containers, this could lead to stopped containers not starting again. (PSBM-81264)

  • vstorage-mount spent a lot of time in isolate_freepages_block() in some cases, causing performance issues. (PSBM-81488)

  • Memcg swpin/swpout stats were calculated incorrectly. (PSBM-81509)

  • Ploop: some I/O requests were not marked as completed in case of errors. (PSBM-81600)

3. Installing the Update

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