# [SMID_PID_FILE_LOCK](https://apps.juniper.net/syslog-explorer/?msg=SMID_PID_FILE_LOCK)

## SYSLOG Details
- **Message**: Unable to lock PID file; another <variable>program-name</variable> was running
- **Help**: subscriber-management could not lock PID file
- **Description**: The Subscriber Management process (subscriber-management) attempted to lock the file that records its process ID (PID), which serves to prevent multiple instances of the smid process from running simultaneously. The attempt failed.
- **Type**: SNO: Should Not Occur
- **Severity**: error
- **Cause**: Another instance of the smid process is running.
- **Action**: Check whether another smid process is running, and stop it if appropriate.
- **Attributes**: program-name
- **Facility**: ANY

## Found this message in the following releases:
- [Junos OS 24.2R1](https://apps.juniper.net/syslog-explorer/?msg=SMID_PID_FILE_LOCK&sw=Junos%20OS&rel=24.2R1)
- [Junos OS 23.4R1](https://apps.juniper.net/syslog-explorer/?msg=SMID_PID_FILE_LOCK&sw=Junos%20OS&rel=23.4R1)