gopls: automated issue report (crash)

[Devinwong]

gopls version: v0.15.3/go1.22.2
gopls flags:
update flags: proxy
extension version: 0.41.2
environment: Visual Studio Code linux
initialization error: undefined
issue timestamp: Fri, 19 Apr 2024 21:41:19 GMT
restart history:
Fri, 19 Apr 2024 21:36:39 GMT: activation (enabled: true)
Fri, 19 Apr 2024 21:37:51 GMT: installation (enabled: true)
Fri, 19 Apr 2024 21:40:34 GMT: installation (enabled: true)

ATTENTION: PLEASE PROVIDE THE DETAILS REQUESTED BELOW.

Describe what you observed.

1. Run VS code
2. Press F1 to install/ update tools, and select gopls@latest
3. See successful message: Installing golang.org/x/tools/gopls@latest (/home/devinwon/go/bin/gopls) SUCCEEDED
4. After a short while like 30 seconds, a notification VS code pops up saying the connection to gopls has been closed. The gopls server may have crashed

panic: runtime error: slice bounds out of range [:-1]

goroutine 19961 [running]:
golang.org/x/tools/gopls/internal/protocol.(*Mapper).LineCol8Position(0xc01b4b55c0, 0x1, 0x0)
	  mapper.go:151  0x1ad
golang.org/x/tools/gopls/internal/cache.goPackagesErrorDiagnostics.func1({{0x0, 0x0}, {0xc009e3b680, 0x60}, 0x1}, 0x60%3F, {0x128b8c0, 0xc00d0aa5a0}, {0x1293d20, 0xc0170e7450})
	  errors.go:58  0x145
golang.org/x/tools/gopls/internal/cache.goPackagesErrorDiagnostics({0x1293d20, 0xc0170e7450}, {{0x0, 0x0}, {0xc009e3b680, 0x60}, 0x1}, 0xc00d7fcf00, {0x128b8c0, 0xc00d0aa5a0})
	  errors.go:69  0xf5
golang.org/x/tools/gopls/internal/cache.computeLoadDiagnostics({0x1293d20, 0xc0170e7450}, 0xc00d0aa5a0, 0xc00d7fcf00)
	  load.go:541  0x185
golang.org/x/tools/gopls/internal/cache.(*packageHandleBuilder).buildPackageHandle(0xc015eb7200, {0x1293d20, 0xc0170e7450}, 0xc016f366e0)
	  check.go:1129  0x2b7
golang.org/x/tools/gopls/internal/cache.(*Snapshot).getPackageHandles.func2.1()
	  check.go:932  0xce
golang.org/x/sync/errgroup.(*Group).Go.func1()
	  errgroup.go:78  0x56
created by golang.org/x/sync/errgroup.(*Group).Go in goroutine 18971
	  errgroup.go:75  0x96

gopls stats -anon

gopls stats -anon failed after 7640 ms. Please check if gopls is killed by OS.

OPTIONAL: If you would like to share more information, you can attach your complete gopls logs.

NOTE: THESE MAY CONTAIN SENSITIVE INFORMATION ABOUT YOUR CODEBASE.
DO NOT SHARE LOGS IF YOU ARE WORKING IN A PRIVATE REPOSITORY.

<OPTIONAL: ATTACH LOGS HERE>

[Devinwong]

My project is very huge and consists of many packages. I worked around this by adding a go.work file in the root, and added one of the package I am focused on to that go.work. Then gopls doesn't complain. So wondering if it's because the project is too huge?

[findleyr]

@Devinwong I think this crash is due to processing of one specific error message.
This looks like a dupe of golang/go#66875, and #3352 seems to have a reliable reproducer.
I will send a fix. Closing this as a dupe.