linux received signal 15

Signal 15 is SIGTERM, which is a termination signal that is sent to a process to request that it terminate gracefully. This signal is typically sent by the system when shutting down or rebooting. When a process receives this signal, it should save its state and exit cleanly.

In Linux, you may see the message "received signal 15" in the system logs or console output when a process is terminated with SIGTERM. This is a normal part of the shutdown process and does not necessarily indicate an error or problem. However, if a process is not terminating gracefully in response to SIGTERM, it may indicate a bug or issue in the software.