Debugging a FUSE deadlock in the Linux kernel

Debugging a FUSE deadlock in the Linux kernel

摘要

The Compute team at Netflix is charged with managing all AWS and containerized workloads at Netflix, including autoscaling, deployment of containers, issue remediation, etc. As part of this team, I work on fixing strange things that users report.

This particular issue involved a custom internal FUSE filesystem: ndrive. It had been festering for some time, but needed someone to sit down and look at it in anger. This blog post describes how I poked at /procto get a sense of what was going on, before posting the issue to the kernel mailing list and getting schooled on how the kernel’s wait code actually works!