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smolvm

v1.6.5 Breaking

This release includes 1 breaking change for platform teams planning a safe upgrade.

Published 10d Virtualization
✓ No known CVEs patched
Read the diff → Tool health → What is this tool? →

✓ No known CVEs patched in this version

Topics

containers crun libkrun microvm rust virtual-machine

ReleasePort's take

Light signal
editorial:auto 10d

The release v1.6.5 adds the docker‑socket bridge to the machines HTTP API and renames CUDA fork environment variables.

Why it matters: Exposing the docker‑socket via HTTP enables container orchestration workflows; renaming CUDA variables clarifies configuration for GPU workloads in this version.

Summary

AI summary

Expose docker‑socket bridge via HTTP API and rename CUDA fork environment variables.

Changes in this release

Feature Medium

Expose the docker-socket bridge in the machines HTTP API.

Expose the docker-socket bridge in the machines HTTP API.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Feature Low

Add cuda to VmResources for CLI/SDK CUDA-over-vsock support.

Add cuda to VmResources for CLI/SDK CUDA-over-vsock support.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Feature Low

Add --expose-socket and --mount-socket flags for forwarding arbitrary Unix sockets.

Add --expose-socket and --mount-socket flags for forwarding arbitrary Unix sockets.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Feature Low

Implement CUDA fork independent serving with copy-on-fork isolation, graph mode, and network transport.

Implement CUDA fork independent serving with copy-on-fork isolation, graph mode, and network transport.

Source: granite4.1:30b@2026-07-17-audit

Confidence: low

 —
Feature Low

Warn when CUDA remoting is requested on a host without usable GPU.

Warn when CUDA remoting is requested on a host without usable GPU.

Source: granite4.1:30b@2026-07-17-audit

Confidence: low

 —
Feature Low

Bundle CUDA shims and smolvm-cuda-run in agent-rootfs for releases.

Bundle CUDA shims and smolvm-cuda-run in agent-rootfs for releases.

Source: granite4.1:30b@2026-07-17-audit

Confidence: low

 —
Dependency Low

Bump the Nix flake to smolvm 1.6.0.

Bump the Nix flake to smolvm 1.6.0.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Dependency Low

Rebuild linux libkrun.so with a glibc 2.35 floor and gate it in CI.

Rebuild linux libkrun.so with a glibc 2.35 floor and gate it in CI.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Performance Medium

Implement address-preserving per-clone-process fork isolation for CUDA Path 3.

Implement address-preserving per-clone-process fork isolation for CUDA Path 3.

Source: granite4.1:30b@2026-07-17-audit

Confidence: low

 —
Performance Medium

Stream pack overlay export to disk instead of memory.

Stream pack overlay export to disk instead of memory.

Source: granite4.1:30b@2026-07-17-audit

Confidence: low

 —
Bugfix Medium

Fix pacman repo build to package both architectures.

Fix pacman repo build to package both architectures.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Bugfix Medium

Make VM boot failures diagnosable instead of opaque.

Make VM boot failures diagnosable instead of opaque.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Bugfix Medium

Group container tasks under the sandbox shim for containerd 2.2+ compatibility.

Group container tasks under the sandbox shim for containerd 2.2+ compatibility.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Bugfix Medium

Detect stale CUDA guest shim at boot instead of opaque cuInit failure.

Detect stale CUDA guest shim at boot instead of opaque cuInit failure.

Source: granite4.1:30b@2026-07-17-audit

Confidence: low

 —
Bugfix Medium

Fix fork crashes and enable zero-config forkable machines with remote (TCP) clone workers for CUDA Path 3 follow-ups.

Fix fork crashes and enable zero-config forkable machines with remote (TCP) clone workers for CUDA Path 3 follow-ups.

Source: granite4.1:30b@2026-07-17-audit

Confidence: low

 —
Bugfix Medium

Run create workload on CUDA image machines and fail fast when no GPU host answers.

Run create workload on CUDA image machines and fail fast when no GPU host answers.

Source: granite4.1:30b@2026-07-17-audit

Confidence: low

 —
Refactor Low

Rename CUDA fork environment variables to describe behavior.

Rename CUDA fork environment variables to describe behavior.

Source: granite4.1:30b@2026-07-17-audit

Confidence: low

 —
Full changelog

What's Changed

  • Bump the Nix flake to smolvm 1.6.0 by @BinSquare in https://github.com/smol-machines/smolvm/pull/625
  • Fix the pacman repo build so it packages both architectures by @BinSquare in https://github.com/smol-machines/smolvm/pull/626
  • Make VM boot failures diagnosable instead of opaque by @BinSquare in https://github.com/smol-machines/smolvm/pull/627
  • docs: recommend the unix-socket docker endpoint; document the TCP alternative and its caveats by @BinSquare in https://github.com/smol-machines/smolvm/pull/621
  • Add cuda to VmResources for CLI/SDK CUDA-over-vsock by @BinSquare in https://github.com/smol-machines/smolvm/pull/628
  • CUDA fork independent serving: copy-on-fork isolation, graph mode, network transport by @BinSquare in https://github.com/smol-machines/smolvm/pull/629
  • Detect a stale CUDA guest shim at boot instead of an opaque cuInit failure by @BinSquare in https://github.com/smol-machines/smolvm/pull/630
  • feat: expose the docker-socket bridge in the machines HTTP API by @BinSquare in https://github.com/smol-machines/smolvm/pull/631
  • Resolve a named config.User to a numeric uid for crun exec (#632) by @BinSquare in https://github.com/smol-machines/smolvm/pull/634
  • Warn at launch when CUDA remoting is requested on a host with no usable GPU by @BinSquare in https://github.com/smol-machines/smolvm/pull/635
  • CUDA Path 3: address-preserving per-clone-process fork isolation by @BinSquare in https://github.com/smol-machines/smolvm/pull/633
  • Bump the workspace to 1.6.1 by @BinSquare in https://github.com/smol-machines/smolvm/pull/641
  • Group container tasks under the sandbox shim (fixes containers on containerd 2.2+) by @BinSquare in https://github.com/smol-machines/smolvm/pull/643
  • Rebuild the linux libkrun.so with a glibc 2.35 floor and gate it in CI by @BinSquare in https://github.com/smol-machines/smolvm/pull/644
  • CUDA Path 3 follow-ups: fork crash fixes, zero-config forkable machines, remote (TCP) clone workers by @BinSquare in https://github.com/smol-machines/smolvm/pull/648
  • Route smolmachine pack references through the host-side pack flow instead of the in-guest OCI puller by @BinSquare in https://github.com/smol-machines/smolvm/pull/647
  • Stamp pushed smolmachine manifests with the OCI 1.1 artifactType and standard annotations by @BinSquare in https://github.com/smol-machines/smolvm/pull/649
  • CUDA fork: release a torn-down golden's VRAM (close leaked export fds) by @BinSquare in https://github.com/smol-machines/smolvm/pull/650
  • CUDA fork: fail fast when a clone's worker dies or its lineage is gone by @BinSquare in https://github.com/smol-machines/smolvm/pull/652
  • Rename the CUDA fork env vars to describe behavior by @BinSquare in https://github.com/smol-machines/smolvm/pull/653
  • release: bundle CUDA shims + smolvm-cuda-run in agent-rootfs by @NickyHeC in https://github.com/smol-machines/smolvm/pull/601
  • Stream the pack overlay export to disk by @BinSquare in https://github.com/smol-machines/smolvm/pull/654
  • CUDA image machines: run the create workload, and fail fast when no GPU host answers by @BinSquare in https://github.com/smol-machines/smolvm/pull/655
  • feat: add --expose-socket and --mount-socket for forwarding arbitrary unix sockets by @BinSquare in https://github.com/smol-machines/smolvm/pull/656

Full Changelog: https://github.com/smol-machines/smolvm/compare/v1.6.0...v1.6.5

Breaking Changes

  • Rename the CUDA fork environment variables to describe behavior
View diff on GitHub

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About smolvm

Tool to build & run portable, lightweight, self-contained virtual machines.

All releases →

Related context

Earlier breaking changes

  • v1.0.0 Remove built‑in store; VM now relies on host environment/files only.

Beta — feedback welcome: [email protected]