Inode Exhaustion in /dev/shm on RHEL 8.10

Products

• Carbon Black App Control

Issue/Introduction

Introduction Linux endpoints running Red Hat Enterprise Linux (RHEL) 8.10 may experience system instability, high CPU/memory utilization, or service failures. This occurs when the /dev/shm filesystem exhausts all available inodes, preventing new temporary files from being created.

Symptoms

• Applications fail with "No space left on device" errors.
• df -h shows significant disk space available on /dev/shm.
• df -i /dev/shm shows 100% inode utilization.
• System performance degrades exponentially until a reboot is performed.

Environment

• RHEL 8.10
• App Control Linux Agent versions 8.8.x

Cause

This issue is caused by defect CRE-23406. The agent's kernel module monitoring creates orphaned "shadow" inode entries during high-frequency file operations on the tmpfs filesystem.

Resolution

This issue is scheduled to be resolved in future releases, starting from version 8.10.

For a workaround or immediate assistance with affected RHEL 8.10 systems, please contact Broadcom Support.

Additional Information

• For instructions on collecting logs for further analysis, see Collect Agent Performance Logs.
• To speak with a customer representative or a Support Engineer see Contact Support.