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Server locking up, /var/log/messages reports "backlog limit exceeded"

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http://serverfault.com – We have a CentOS OS that became unresponsive this morning to external network traffic. It is a virtual machine. I was able to reboot the VM. After logging back in, I found the following in the /var/log/messages file, repeating over and over, up to the point of the reboot: Jan 21 06:53:01 PBX kernel: audit: backlog limit exceeded Jan 21 06:53:01 PBX kernel: audit: audit_backlog=321 > audit_backlog_limit=320 Jan 21 06:54:01 PBX kernel: printk: 8 messages suppressed. Jan 21 06:54:01 PBX kernel: audit: audit_backlog=321 > audit_backlog_limit=320 Jan 21 06:54:01 PBX kernel: audit: audit_lost (HowTos)