fix: resolve go vet sync.Mutex copy-by-value errors by Norway-02 · Pull Request #2169 · Project-HAMi/HAMi

Norway-02 · 2026-07-28T10:03:31Z

What type of PR is this?
/kind bug

What this PR does / why we need it:
This PR resolves several go vet violations where a sync.Mutex was inadvertently copied by value.

In devices.go, passing Device by value in receiver methods triggered a lock copy of the embedded protobuf MessageState mutex. I've updated these to use pointer receivers.

In device_map.go, updateDeviceMapWithReplicas was dereferencing the device struct to create a replica. I replaced this with an explicit struct initialization that safely copies fields without copying the embedded mutex.

In server_test.go, the loop assigned tc := testCases[i]. Because expectedResponse is a ContainerAllocateResponse containing a protobuf mutex, this triggered go vet. I changed this to a pointer reference tc := &testCases[i].

These changes ensure go vet ./... passes cleanly on master.

Which issue(s) this PR fixes:
NONE

Special notes for your reviewer:
Note: This PR was prepared with AI assistance; the solution was reviewed and tested manually.

Does this PR introduce a user-facing change?:

NONE

Summary by CodeRabbit

Bug Fixes
- Improved replicated device handling so replicas consistently preserve health, topology, paths, memory, and compute capability details.
- Improved device allocation checks for more reliable capability and UUID handling.
Tests
- Expanded replication coverage to validate complete device details.
- Improved test case handling for more consistent per-case assertions.

hami-robot · 2026-07-28T10:03:35Z

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Norway-02
Once this PR has been reviewed and has the lgtm label, please assign wawa0210 for approval. For more information see the Kubernetes Code Review Process.

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hami-robot · 2026-07-28T10:03:41Z

Welcome @Norway-02! It looks like this is your first PR to Project-HAMi/HAMi 🎉

coderabbitai · 2026-07-28T10:03:52Z

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Reviewing files that changed from the base of the PR and between a01f782 and b09689c.

📒 Files selected for processing (1)

pkg/device-plugin/nvidiadevice/nvinternal/rm/device_map.go

📝 Walkthrough

Walkthrough

The change updates three Device methods to pointer receivers, preserves protobuf data when constructing replicas, expands replication assertions, and references CDI test cases by pointer.

Changes

Device replica updates

Layer / File(s)	Summary
Device method receiver updates `pkg/device-plugin/nvidiadevice/nvinternal/rm/devices.go`	`AlignedAllocationSupported`, `IsMigDevice`, and `GetUUID` now use pointer receivers.
Explicit replicated device construction and validation `pkg/device-plugin/nvidiadevice/nvinternal/rm/device_map.go`, `pkg/device-plugin/nvidiadevice/nvinternal/rm/device_map_test.go`, `pkg/device-plugin/nvidiadevice/nvinternal/plugin/server_test.go`	Replica construction clones protobuf data and copies selected fields. Tests validate complete replicated devices. CDI test cases use pointers.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

Project-HAMi/HAMi#2087: Uses updateDeviceMapWithReplicas and relates to replica data preservation.
Project-HAMi/HAMi#2217: Shares changes across the device map, device map tests, device methods, and CDI server tests.

Suggested reviewers: wawa0210

Poem

A rabbit checks each replica’s fields,
While cloned protobuf data yields.
Pointer methods guide the way,
CDI cases test today.
Complete device facts remain.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the primary change: fixing go vet errors caused by copying sync.Mutex values.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Signed-off-by: Norway-02 <anshulkhetade02@gmail.com>

Norway-02 · 2026-07-28T10:08:15Z

cc @FouoF @archlitchi Please review this PR when you have a moment. Thank you!

mesutoezdil

TestUpdateDeviceMapWithReplicas only sets ID and Index, so it stays green even if one of the hand copied fields gets dropped, worth extending.

mesutoezdil · 2026-07-29T08:45:37Z

-				replicatedDevice.Replicas = r.Replicas
-				devices.insert(name, &replicatedDevice)
+				orig := oDevices[r.Name][id]
+				replicatedDevice := &Device{


hand listing fields means a new field on Device or on kubelets v1beta1.Device silently stops reaching replicas. did u look at proto.Clone for the embedded part?

Signed-off-by: Norway-02 <anshulkhetade02@gmail.com>

Norway-02 · 2026-07-29T10:57:11Z

Thank you for the feedback! I've pushed a follow-up that addresses both points.

I replaced the manual Protobuf field copy with proto.Merge(). It avoids the go vet copylock warning and also takes care of any new fields added to v1beta1.Device in the future.

I also expanded TestUpdateDeviceMapWithReplicas to cover all the fields. I had to switch the assertions for the embedded structs from require.EqualValues to proto.Equal because of the internal state populated by proto.Merge().

I've run go vet and go test for the rm package locally, and both are passing. Thank you!

proto.Merge on a fresh zero-value proto works, but proto.Clone is more explicit — it returns a complete deep copy of the embedded kubelet Device in a single call, making the intent clear and removing the two-step initialize-then-merge pattern. Signed-off-by: Norway-02 <anshulkhetade02@gmail.com>

Norway-02 · 2026-08-01T11:20:27Z

@mesutoezdil @archlitchi @wawa0210 PTAL when you have a chance — the last round of feedback (use proto.Clone for the embedded Device) has been addressed. Thank you!

mesutoezdil · 2026-08-03T10:21:25Z

Closing: after 3 commits the core go vet error in device_map.go still fails (the proto.Clone dereference still copies the embedded sync.Mutex), and real CI (Compile/Unit test/lint) has never run on this branch.

hami-robot Bot added kind/bug Something isn't working dco-signoff: no labels Jul 28, 2026

hami-robot Bot requested review from FouoF and wawa0210 July 28, 2026 10:03

hami-robot Bot added the size/S label Jul 28, 2026

coderabbitai Bot requested a review from mesutoezdil July 28, 2026 10:04

fix(rm): resolve go vet sync.Mutex copy-by-value errors

cecd3aa

Signed-off-by: Norway-02 <anshulkhetade02@gmail.com>

Norway-02 force-pushed the fix-go-vet-lock-copy branch from 956d45d to cecd3aa Compare July 28, 2026 10:05

hami-robot Bot added dco-signoff: yes and removed dco-signoff: no labels Jul 28, 2026

mesutoezdil reviewed Jul 29, 2026

View reviewed changes

hami-robot Bot added dco-signoff: no size/L and removed dco-signoff: yes size/S labels Jul 29, 2026

fix: use proto.Merge to safely copy embedded protobuf and extend tests

a01f782

Signed-off-by: Norway-02 <anshulkhetade02@gmail.com>

Norway-02 force-pushed the fix-go-vet-lock-copy branch from ba006e0 to a01f782 Compare July 29, 2026 10:56

hami-robot Bot added dco-signoff: yes and removed dco-signoff: no labels Jul 29, 2026

coderabbitai Bot mentioned this pull request Jul 30, 2026

fix(scheduler): graceful handling of asymmetric GPU topology to prevent panics #2217

Closed

mesutoezdil closed this Aug 3, 2026

coderabbitai Bot mentioned this pull request Aug 13, 2026

fix(device-plugin): prevent mutex pass-by-value in device replication #2652

Closed

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fix: resolve go vet sync.Mutex copy-by-value errors - #2169

fix: resolve go vet sync.Mutex copy-by-value errors#2169
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