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smolvm

v1.6.6 Feature

This release adds 2 notable features for engineering teams evaluating rollout.

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

Summary

AI summary

Detect stale CUDA guest shim at boot, make VM failures diagnosable, expose docker‑socket bridge via HTTP API and add --expose‑socket / --mount‑socket.

Changes in this release

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

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 --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

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

Add 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

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

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

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

Confidence: low

 —
Feature Low

Add remote (TCP) clone workers for CUDA Path 3 follow‑ups.

Add remote (TCP) clone workers for CUDA Path 3 follow‑ups.

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 Low

Stream the pack overlay export to disk.

Stream the pack overlay export to disk.

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

Resolve a named config.User to a numeric uid for crun exec.

Resolve a named config.User to a numeric uid for crun exec.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Bugfix Medium

Group container tasks under the sandbox shim to fix containers on containerd 2.2+.

Group container tasks under the sandbox shim to fix containers on containerd 2.2+.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Bugfix Medium

Run the pack-from-vm helper as the source VM's isolated uid so it can read source disks.

Run the pack-from-vm helper as the source VM's isolated uid so it can read source disks.

Source: llm_adapter@2026-07-17

Confidence: high

 —
Bugfix Low

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

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

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

Confidence: low

 —
Bugfix Low

Fix fork crashes and enable zero-config forkable machines in CUDA Path 3 follow-ups.

Fix fork crashes and enable zero-config forkable machines in CUDA Path 3 follow-ups.

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

Confidence: low

 —
Bugfix Low

Release torn‑down golden's VRAM and close leaked export fds in CUDA fork.

Release torn‑down golden's VRAM and close leaked export fds in CUDA fork.

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

Confidence: low

 —
Bugfix Low

Fail fast when a clone's worker dies or its lineage is gone in CUDA fork.

Fail fast when a clone's worker dies or its lineage is gone in CUDA fork.

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

Confidence: low

 —
Bugfix Low

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
  • Run the pack-from-vm helper as the source VM's isolated uid so it can read the source disks by @BinSquare in https://github.com/smol-machines/smolvm/pull/658

Full Changelog: https://github.com/smol-machines/smolvm/compare/v1.6.0...v1.6.6

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]