From the logs the kernel bug seems to be affecting JAVA rather than tomcat7 itself.
We also have the same problem occurring with our JetBrains License Server crashed this morning - generating the same kernel errors. JetBrains has a commercial JAVA web application service, not tomcat7, and it is configured to run with Oracle Java 1.8.0.
Our tomcat7 instances are running with the Ubuntu package for OpenJDK 1.7.0_181
From the logs the kernel bug seems to be affecting JAVA rather than tomcat7 itself.
We also have the same problem occurring with our JetBrains License Server crashed this morning - generating the same kernel errors. JetBrains has a commercial JAVA web application service, not tomcat7, and it is configured to run with Oracle Java 1.8.0.
Our tomcat7 instances are running with the Ubuntu package for OpenJDK 1.7.0_181