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goroutineresourceleak (81st linter): paren_unwrap_gap across lock/cancel/channel detection, day one

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Issue 类型
缺陷
描述清晰度
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技术栈
go
领域
tooling

调研方向

从 pkg/linters/goroutineresourceleak/goroutineresourceleak.go 开始，其中第 75 行已经正确调用了 astutil.UnwrapParenExpr。请以同样的方式包裹第 209、216、228、322、346、355 和 379 行中未包裹的断言。在 testdata/src/a/a.go 中为 cancel、mutex 和 channel 用例添加带括号的变体。当这些 testdata 用例通过且现有测试仍然通过时，即为完成。

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描述

cookie sergo

Problem

pkg/linters/goroutineresourceleak (registered today via PR #68502, the 81st analyzer, registry.go confirms the delta from 80 to 81) independently reimplements lock/unlock, context-cancel, and channel send/receive/close detection rather than reusing the shared resourcetracker framework. It reproduces the long-established paren_unwrap_gap class (already filed and fixed across astutil.go, nilctxpassed, errstringmatch, sprintfbool, tolowerequalfold, timenowsub, httpstatuscode, seenmapbool, closeerrorunchecked, typeassertionnil, walkdirignoredeerror, and resourcetracker.go in prior runs) at no fewer than six call sites in one new file, pkg/linters/goroutineresourceleak/goroutineresourceleak.go:

  • contextCancelAcquisition (line 322): bare rhs.(*ast.CallExpr).
  • isDeferredCancel (line 346): bare deferStmt.Call.Fun.(*ast.Ident).
  • mutexLockAcquisition (line 355): bare exprStmt.X.(*ast.CallExpr).
  • isDeferredUnlock (line 379): bare deferStmt.Call.Fun.(*ast.SelectorExpr).
  • markChannelUsage (lines 209, 216, 228): bare *ast.Ident assertions on SendStmt.Chan, the close() call argument, and the UnaryExpr.X receive operand.

Notably, the same file already imports astutil and correctly calls astutil.UnwrapParenExpr at line 75 (astutil.UnwrapParenExpr(call.Fun).(*ast.FuncLit)) for the goroutine literal itself, so the gap is an inconsistency within the file rather than a missing dependency.

Impact

Parenthesized forms are valid Go and compile identically to unparenthesized ones, for example ctx, cancel := (context.WithCancel(ctx)), defer (cancel()), (mu.Lock()), defer (mu.Unlock()), (ch) <- v, <-(ch), close((ch)). For the acquisition/defer sites, a parenthesized acquisition or deferred cleanup call means the whole per-goroutine check never engages, so a goroutine with a genuine unguarded leak using one of these forms is never reported. For the channel usage sites, a genuinely-used channel referenced once through a parenthesized identifier is treated as never sent/received/closed, producing a false-positive leak report on otherwise-correct code.

Not yet wired into .github/workflows/cgo.yml LINTER_FLAGS, so currently latent rather than CI-breaking, matching the filing bar used for prior day-one findings on new linters such as typeassertionnil and closeerrorunchecked.

Recommendation

Wrap each of the six bare type assertions with astutil.UnwrapParenExpr(...) first, consistent with the correct usage already present at line 75 of the same file.

Validation

Add parenthesized-form variants to testdata/src/a/a.go for each of the three checks (cancel, mutex, channel) to lock in the fix and prevent regression.

Effort: Medium — six call-site fixes in one file plus matching testdata.

Generated by 🤖 Sergo - Serena Go Expert · claude · agent · 375.9 AIC · ⊞ 5.2K · ◷

  • expires on Oct 20, 2026, 8:01 PM UTC-08:00
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