Kernel update: Virtuozzo ReadyKernel patch 77.1 for Virtuozzo 7.0 Update 9 and Virtuozzo Infrastructure Platform 2.5

Issue date: 2019-04-22

Applies to: Virtuozzo 7.0, Virtuozzo Infrastructure Platform 2.5

Virtuozzo Advisory ID: VZA-2019-027

1. Overview

The cumulative Virtuozzo ReadyKernel patch was updated with stability fixes. The patch applies to the kernels 3.10.0-862.20.2.vz7.73.24 and 3.10.0-862.20.2.vz7.73.29 (Virtuozzo 7.0 Update 9 and Virtuozzo Infrastructure Platform 2.5).

2. Bug Fixes

  • ploop: potential data corruption due to a race between ‘prepare_merge’ and ‘submit_alloc’ operations. (PSBM-93349)

  • High order page allocations were triggered by CRIU while restoring TCP sockets. (PSBM-93672)

  • vzstat shows incorrect per-container scheduling latency (MLAT). (PSBM-93675)

  • High order page allocations were made in neigh_probe() in certain cases. (PSBM-93713)

  • It was discovered that network drivers could allocate memory for the socket buffers from pfmemalloc memory reserves, even when it was unnecessary. As a result, network packets were dropped by sk_filter_trim_cap(), causing performance issues. (VSTOR-21390)

3. Installing the Update

Download, install, and immediately 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