Kernel update: Virtuozzo ReadyKernel patch 77.0 for Virtuozzo 7.0.6 and 7.0.6 HF3¶
Issue date: 2019-04-25
Applies to: Virtuozzo 7.0
Virtuozzo Advisory ID: VZA-2019-029
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¶
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)
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, the 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’.