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@Manciukic Manciukic commented Nov 21, 2025

Note: this depends on #5524 for the validate_api=False flags (unless I remove them from here to make this CR merge first).

Changes

  • Add an integration test for GDB
  • Add a --gdb flag in the sandbox tool

Reason

GDB was broken, I fixed it, and I don't want it to break again without anybody noticing.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under
the terms of the Apache 2.0 license. For more information on following Developer
Certificate of Origin and signing off your commits, please check
CONTRIBUTING.md.

PR Checklist

  • I have read and understand CONTRIBUTING.md.
  • I have run tools/devtool checkbuild --all to verify that the PR passes
    build checks on all supported architectures.
  • I have run tools/devtool checkstyle to verify that the PR passes the
    automated style checks.
  • I have described what is done in these changes, why they are needed, and
    how they are solving the problem in a clear and encompassing way.
  • I have updated any relevant documentation (both in code and in the docs)
    in the PR.
  • I have mentioned all user-facing changes in CHANGELOG.md.
  • If a specific issue led to this PR, this PR closes the issue.
  • When making API changes, I have followed the
    Runbook for Firecracker API changes.
  • I have tested all new and changed functionalities in unit tests and/or
    integration tests.
  • I have linked an issue to every new TODO.

  • This functionality cannot be added in rust-vmm.

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codecov bot commented Nov 21, 2025

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.88%. Comparing base (2b05435) to head (27c67ef).

Additional details and impacted files
@@           Coverage Diff           @@
##             main    #5527   +/-   ##
=======================================
  Coverage   82.88%   82.88%           
=======================================
  Files         270      270           
  Lines       27784    27784           
=======================================
  Hits        23028    23028           
  Misses       4756     4756           
Flag Coverage Δ
5.10-m5n.metal 83.07% <ø> (ø)
5.10-m6a.metal 82.34% <ø> (+<0.01%) ⬆️
5.10-m6g.metal 79.63% <ø> (-0.01%) ⬇️
5.10-m6i.metal 83.06% <ø> (+<0.01%) ⬆️
5.10-m7a.metal-48xl 82.32% <ø> (ø)
5.10-m7g.metal 79.64% <ø> (ø)
5.10-m7i.metal-24xl 83.03% <ø> (-0.01%) ⬇️
5.10-m7i.metal-48xl 83.03% <ø> (ø)
5.10-m8g.metal-24xl 79.63% <ø> (-0.02%) ⬇️
5.10-m8g.metal-48xl 79.63% <ø> (-0.01%) ⬇️
6.1-m5n.metal 83.09% <ø> (ø)
6.1-m6a.metal 82.37% <ø> (+<0.01%) ⬆️
6.1-m6g.metal 79.63% <ø> (-0.01%) ⬇️
6.1-m6i.metal 83.09% <ø> (ø)
6.1-m7a.metal-48xl 82.35% <ø> (ø)
6.1-m7g.metal 79.63% <ø> (-0.01%) ⬇️
6.1-m7i.metal-24xl 83.10% <ø> (ø)
6.1-m7i.metal-48xl 83.11% <ø> (-0.01%) ⬇️
6.1-m8g.metal-24xl 79.63% <ø> (-0.02%) ⬇️
6.1-m8g.metal-48xl 79.63% <ø> (-0.01%) ⬇️

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The integ test opens gdb on a subprocess which connects to Firecracker,
sets a breakpoint and continues until boot is complete. If the VM boots
correctly and the breakpoint gets hit, then the test will succeed.

This test currently only works on x86 as GDB requires a vmlinux image
(we use a uImage on ARM).

Signed-off-by: Riccardo Mancini <mancio@amazon.com>
This adds a sandbox option to setup GDB automatically and open it in a
new tmux window. This makes it easier to use GDB with firecracker using
common tooling.

Signed-off-by: Riccardo Mancini <mancio@amazon.com>
The cmd_fmt wouldn't format like the CI test would like it. This commit
fixes the issue.

Signed-off-by: Riccardo Mancini <mancio@amazon.com>
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