On an Open Enterprise Server 2015 SP1 there are times where cifs service would stop responding and support would require the supportconfig logs and some core dump files. Core dump files is really required to troubleshoot further the issue with cifs protocol. Initially we wouldn't know where to locate the core dump files and this was the question that was raised to OES Support. As provided by OES Support that the core dump file location can be located using the following command. "sysctl -A | grep core_pattern" (this command will provide the actual path to the core dump file) The output of that command will provide something like this: "kernel.core_patten = |/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %e" Will dig some more information on this topic. As of now the important thing is we have located the core dump file location that we can provide to OES Support for further investigation.