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’.

4. References

The JSON file with the list of new and updated packages is available at JSON file.