You can safely ignore this message if you see a reference to the
. It means that the kernel dynamically made some temporary memory allocations by loading some executable code into memory space. The fact that
throws this message indicates that some Hotspot samples were taken when that code was running. During the post-processing time the
's collector could not find the
anymore. The module
on earlier Linux kernels) is a Virtual Dynamic Shared Object (VDSO) that resides in the address space of the program. This is a virtual library that contains a complex logic providing user applications with a fast access to system functions, depending on a CPU microarchitecture, either via an interrupt mechanism or via the fast system calls mechanism (for modern CPUs).