Frozen Netfilter Queues for processing IP packets from userspace

Solution Verified - Updated -

Issue

When a multi-threaded application starts up, and several threads invoke nfq_open_nfnl() at the exactly same time, its possible that one thread ends up with another threads fq_handle in its private per-thread data. When this happens, one queue is seemingly "forgotten" and no packets will be processed because several threads erroneously process the same queue.

Environment

  • rhel-7

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In
Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.