[CNCF LFX Proposal] HAMi: Fix GPU Memory Isolation for Child and SSH Processes

### CNCF Project

HAMi

### Term

2026 Term 3 (Sep-Nov)

### Program Name

Fix GPU Memory Isolation for Child and SSH Processes

### Program Description

## Description

Investigate and fix cases where processes started later inside a HAMi-managed container, including child processes and processes reached through SSH or a new login shell, may not retain the expected GPU memory limit. The first milestone is to reproduce the behavior on a current supported HAMi release. The implementation approach must be agreed with HAMi maintainers rather than assuming a specific configuration mechanism in advance.

## Expected outcomes

- A reproducible test case and documented root cause.
- A maintainer-reviewed design covering the intended isolation boundary, compatibility, and failure modes.
- A maintainer-approved implementation, or a validated design and prototype if platform constraints prevent full delivery within the term.
- Regression tests covering the original process, child processes, and supported SSH or new-shell scenarios.
- Documentation of supported configuration, migration guidance, and known limitations.
- The implementation submitted for HAMi maintainer review.

### Technologies

Kubernetes, Linux containers, NVIDIA GPU, HAMi-core

### Skills same as Technologies?

- [ ] Yes, the required skills are the same as the technologies listed above.

### Required/Desirable Skills

Linux debugging, container runtime analysis, security reasoning, C/C++, testing

### Mentors

Mengxuan Li | @archlitchi | mengxuan.li@dynamia.ai | limengxuan
Jimmy Song | @rootsongjc | rootsongjc@gmail.com | jimmysong

### Upstream Issue URL

https://github.com/Project-HAMi/HAMi/issues/2125

### Application Prerequisites

- [x] Resume
- [x] Cover Letter
- [ ] School Enrollment Verification
- [ ] Participation Permission from school or employer
- [ ] Coding Challenge
- [ ] Custom Prerequisite (fill in details below)

### Coding Challenge URL

_No response_

### Custom Prerequisite Name

_No response_

### Custom Prerequisite Description

_No response_

### Custom Prerequisite — File Upload

- [ ] Yes — completion of this task requires the mentee to submit a file.

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**LFX program:** [CNCF - HAMi: Fix GPU Memory Isolation for Child and SSH Processes (2026 Term 3)](https://mentorship.lfx.linuxfoundation.org/project/e5e55e8c-fab1-4453-9d49-a4a5e013c4c5)

Start with upstream issue #2125 and reproduce the GPU memory isolation behavior on a current supported HAMi release, including child processes and supported SSH or new-shell scenarios. Document the root cause and develop a maintainer-reviewed design covering isolation boundaries, compatibility, and failure modes. Done means approved regression tests, documentation of configuration and limitations, and a maintainer-reviewed implementation or validated prototype.

Written by the indexing model from the issue text.