x/tools/gopls: panic during completion in go template (crash)

[dnywonnt]

gopls version: v0.16.1/go1.22.0
gopls flags:
update flags: proxy
extension version: 0.41.4
environment: Visual Studio Code linux
initialization error: undefined
issue timestamp: Sun, 14 Jul 2024 07:29:06 GMT
restart history:
Sun, 14 Jul 2024 05:00:06 GMT: activation (enabled: true)

ATTENTION: PLEASE PROVIDE THE DETAILS REQUESTED BELOW.

Describe what you observed.

panic: runtime error: slice bounds out of range [91:90]

goroutine 118 [running]:
golang.org/x/tools/gopls/internal/template.(*completer).complete(0xc0028b32c0)
	  completion.go:117  0xd25
golang.org/x/tools/gopls/internal/template.Completion({0xc0007e1980%3F, 0x5a%3F}, 0x8%3F, {0x131daa0, 0xc001b380c0}, {0x50d688%3F, 0xc0%3F}, {0x1, {0x0, 0x0}})
	  completion.go:56  0x308
golang.org/x/tools/gopls/internal/server.(*server).Completion(0xc00020c600, {0x131c608, 0xc000451230}, 0xc0002ee5a0)
	  completion.go:54  0x499
golang.org/x/tools/gopls/internal/protocol.serverDispatch({0x131c640, 0xc00054c550}, {0x1337cd0, 0xc00020c600}, 0xc000375cb0, {0x131c800, 0xc00036af00})
	  tsserver.go:361  0x2587
golang.org/x/tools/gopls/internal/lsprpc.(*streamServer).ServeStream.ServerHandler.func3({0x131c640, 0xc00054c550}, 0xc000375cb0, {0x131c800, 0xc00036af00})
	  protocol.go:160  0x85
golang.org/x/tools/gopls/internal/lsprpc.(*streamServer).ServeStream.handshaker.func4({0x131c640, 0xc00054c550}, 0xc000375cb0, {0x131c800, 0xc00036af00})
	  lsprpc.go:509  0x923
golang.org/x/tools/gopls/internal/protocol.Handlers.MustReplyHandler.func1({0x131c640, 0xc00054c550}, 0xc00019d020, {0x131c800, 0xc00036af00})
	  handler.go:35  0xc6
golang.org/x/tools/gopls/internal/protocol.Handlers.AsyncHandler.func2.2()
	  handler.go:103  0x96
created by golang.org/x/tools/gopls/internal/protocol.Handlers.AsyncHandler.func2 in goroutine 96
	  handler.go:100  0x1c5

gopls stats -anon

{ "DirStats": { "Files": 134, "TestdataFiles": 0, "GoFiles": 40, "ModFiles": 1, "Dirs": 76 }, "GOARCH": "amd64", "GOOS": "linux", "GOPACKAGESDRIVER": "", "GOPLSCACHE": "", "GoVersion": "go1.22.0", "GoplsVersion": "v0.16.1", "InitialWorkspaceLoadDuration": "813.282514ms", "MemStats": { "HeapAlloc": 34401120, "HeapInUse": 52289536, "TotalAlloc": 579967608 }, "WorkspaceStats": { "Files": { "Total": 2107, "Largest": 935931, "Errs": 0 }, "Views": [ { "GoCommandVersion": "go1.22.0", "AllPackages": { "Packages": 338, "LargestPackage": 161, "CompiledGoFiles": 2103, "Modules": 53 }, "WorkspacePackages": { "Packages": 14, "LargestPackage": 5, "CompiledGoFiles": 40, "Modules": 1 }, "Diagnostics": 0 } ] } }

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[hyangah]

Thanks for the report!
Transferring to the gopls issue tracker.
@dnywonnt In the mean time, can you share code snippet or more details on the completion request made when you observed this issue? That will help us reproduce the problem.

[gabyhelp]

Related Issues and Documentation

• x/tools/gopls/internal/lsp/template: panic - slice bounds out of range (crash) #57621
• x/tools/gopls: out of bounds panic in template completion #49600 (closed)
• x/tools/gopls: automated issue report (crash) #48492 (closed)
• x/tools/gopls: crash when primary diagnostics have invalid positions #66731 (closed)
• x/tools/gopls: panic in semantic tokens #51731 (closed)
• x/tools/gopls: crash in completion.Selection.Suffix #68169 (closed)
• x/tools/gopls: crash during internal/imports.scanDirForPackage (crash) #67156
• x/tools/gopls: automated issue report (crash) #40819 (closed)
• x/tools/gopls: crash in typeparams.Free.Has (empty type set) #68213 (closed)
• x/tools/gopls: crash in adjustRangeForCommentsAndWhiteSpace #55271 (closed)

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[adonovan]

Dup of #57621