Virtuozzo node with Symantec antivirus installed on it is set to work in auto-protect mode with tamper-protection disabled. VIrtuozzo node fails unexpectedly without any obvious actions taken before failure.
The most possible reason is kernel stack overflow caused by interference of Virtuozzo and Symantec filters.
Please run Virtuozzo Update Wizard and install Virtuozzo updates up to VZU35145
If your Virtuozzo server is up2dated or mentioned update doesn't help please follow this scenario.