Running CRIU in the snapshot-agent container throws an error

[AL-Cui]

I'm testing Dynamo's snapshot-agent and using CRIU to checkpoint and restore the vLLM inference engine, but it keeps showing the following error. Can you help me out?

controller/controller.go:236	Checkpoint target detected, triggering checkpoint	{"pod": "default/checkpoint-job-00ccafce5ef260a9-1-8r8bx", "checkpoint_id": "00ccafce5ef260a9"}
2026-07-13T08:38:25.208822415Z	INFO	controller	executor/checkpoint.go:55	=== Starting checkpoint operation ===	{"pod": "default/checkpoint-job-00ccafce5ef260a9-1-8r8bx", "checkpoint_id": "00ccafce5ef260a9"}
2026-07-13T08:38:28.246543252Z	ERROR	controller	criu/dump.go:113	CRIU dump failed	{"pod": "default/checkpoint-job-00ccafce5ef260a9-1-8r8bx", "checkpoint_id": "00ccafce5ef260a9", "duration": 0.307958197, "checkpoint_dir": "/checkpoints/00ccafce5ef260a9/versions/tmp/6d0ac58e-ef9b-4059-8419-943a21fd92db", "dump_log_path": "/checkpoints/00ccafce5ef260a9/versions/tmp/6d0ac58e-ef9b-4059-8419-943a21fd92db/dump.log", "error": "operation failed (msg:Error (criu/util.c:1625): Unable to create the binfmt_misc file system: Operation not permitted\n err:0)\ncriu swrk failed: exit status 1"}
github.com/ai-dynamo/dynamo/deploy/snapshot/internal/criu.ExecuteDump
	/workspace/internal/criu/dump.go:113
github.com/ai-dynamo/dynamo/deploy/snapshot/internal/executor.captureCheckpoint
	/workspace/internal/executor/checkpoint.go:264
github.com/ai-dynamo/dynamo/deploy/snapshot/internal/executor.Checkpoint
	/workspace/internal/executor/checkpoint.go:89
github.com/ai-dynamo/dynamo/deploy/snapshot/internal/controller.(*NodeController).runCheckpoint
	/workspace/internal/controller/controller.go:475
github.com/ai-dynamo/dynamo/deploy/snapshot/internal/controller.(*NodeController).reconcileCheckpointPod.func1
	/workspace/internal/controller/controller.go:240

I've already mounted the proc directory in the snapshot-agent container

[adrianreber]

Not familiar with this, but shouldn't you open this ticket somewhere else? In the tool that integrates CRIU?

[rst0git]

Error (criu/util.c:1625): Unable to create the binfmt_misc file system: Operation not permitted

@AL-Cui What is you kernel version?

[AL-Cui]

Error (criu/util.c:1625): Unable to create the binfmt_misc file system: Operation not permitted

@AL-Cui What is you kernel version?

5.15.0-92-generic Ubuntu 22.04 LTS

[rst0git]

I believe support for unprivileged binfmt_misc mounts was introduced in v6.7:
torvalds/linux@21ca59b

We use Dynamo Snapshots with the following kernels:

• Ubuntu 24.04.4 LTS (GNU/Linux 6.8.0-101-generic x86_64)
• Ubuntu 22.04.5 LTS (GNU/Linux 6.8.0-60-generic x86_64)

[AL-Cui]

I believe support for unprivileged binfmt_misc mounts was introduced in v6.7: torvalds/linux@21ca59b

We use Dynamo Snapshots with the following kernels:

• Ubuntu 24.04.4 LTS (GNU/Linux 6.8.0-101-generic x86_64)
• Ubuntu 22.04.5 LTS (GNU/Linux 6.8.0-60-generic x86_64)

very thanks！I also have a B300 machine with Ubuntu 24.04 LTS system 6.8.0-106-generic. I'll set up the environment and try again.