Buf language server constantly crashing

[mfairley]

I'm constantly getting this crash in VsCode

goroutine 69 [running]:
github.com/bufbuild/protocompile/experimental/report.(*File).LineOffsets(...)
	github.com/bufbuild/protocompile@v0.14.2-0.20251017200126-6da99d83224e/experimental/report/span.go:352
github.com/bufbuild/protocompile/experimental/report.(*File).inverseLocation(0x140002ba1e0, 0x0, 0x0, 0x1)
	github.com/bufbuild/protocompile@v0.14.2-0.20251017200126-6da99d83224e/experimental/report/span.go:407 +0x23c
github.com/bufbuild/protocompile/experimental/report.(*File).InverseLocation(0x14a3b3068?, 0x0, 0x0, 0x14000f10590?)
	github.com/bufbuild/protocompile@v0.14.2-0.20251017200126-6da99d83224e/experimental/report/span.go:313 +0x50
github.com/bufbuild/buf/private/buf/buflsp.(*file).appendLintErrors(0x14000320008, {0x10167c87b, 0xc}, {0x14a3b3068, 0x140013602a0})
	github.com/bufbuild/buf/private/buf/buflsp/file.go:1111 +0x2b8
github.com/bufbuild/buf/private/buf/buflsp.(*file).RunBreaking(0x14000320008, {0x1020aa648, 0x14001016010})
	github.com/bufbuild/buf/private/buf/buflsp/file.go:1083 +0x488
github.com/bufbuild/buf/private/buf/buflsp.(*file).RunChecks.func1({0x1020aa648, 0x14001016010})
	github.com/bufbuild/buf/private/buf/buflsp/file.go:918 +0x190
github.com/bufbuild/buf/private/buf/buflsp.(*file).RunChecks.func2()
	github.com/bufbuild/buf/private/buf/buflsp/file.go:926 +0x64
created by github.com/bufbuild/buf/private/buf/buflsp.(*file).RunChecks in goroutine 49
	github.com/bufbuild/buf/private/buf/buflsp/file.go:922 +0x10c
[Error - 7:23:05 PM] The Buf Language Server server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.
[Error - 7:23:05 PM] Server process exited with code 2.

buf version 1.59.0
extension version: 0.8.1

Version: 1.105.1 (Universal)
Commit: 7d842fb85a0275a4a8e4d7e040d2625abbf7f084
Date: 2025-10-14T22:33:36.618Z
Electron: 37.6.0
ElectronBuildId: 12502201
Chromium: 138.0.7204.251
Node.js: 22.19.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 25.0.0

[elefantepequeno]

I have similar crashes, here's a bit more detailed log:

Command "lsp" is deprecated, use "buf lsp serve" instead. However, "buf beta lsp" will continue to work.
WARN	This command is in beta. It is unstable and likely to change. To suppress this warning, set BUF_BETA_SUPPRESS_WARNINGS=1
INFO	file updated	{"uri":"/workspaces/web/proto/proto/models/v1/models.proto","old_version":-1,"new_version":137}
INFO	parsing IR for file	{"uri":"file:///workspaces/web/proto/proto/models/v1/models.proto","version":137}
panic: runtime error: index out of range [407] with length 407

goroutine 13 [running]:
github.com/bufbuild/protocompile/experimental/source.(*File).LineOffsets(...)
	github.com/bufbuild/protocompile@v0.14.2-0.20251112213711-9afd4296dfe2/experimental/source/file.go:153
github.com/bufbuild/protocompile/experimental/source.inverseLocation(0xc000c31770, 0x197, 0x13, 0x1)
	github.com/bufbuild/protocompile@v0.14.2-0.20251112213711-9afd4296dfe2/experimental/source/file.go:213 +0x270
github.com/bufbuild/protocompile/experimental/source.(*File).InverseLocation(0x7f86?, 0x197, 0x13, 0xc0011bfd10?)
	github.com/bufbuild/protocompile@v0.14.2-0.20251112213711-9afd4296dfe2/experimental/source/file.go:114 +0x5c
github.com/bufbuild/buf/private/buf/buflsp.positionToOffset(...)
	github.com/bufbuild/buf/private/buf/buflsp/completion.go:1581
github.com/bufbuild/buf/private/buf/buflsp.getCompletionItems({0x1b8a3d0, 0xc00006fa40}, 0xc0004ec588, {0x8000?, 0x0?})
	github.com/bufbuild/buf/private/buf/buflsp/completion.go:59 +0xa4
github.com/bufbuild/buf/private/buf/buflsp.(*server).Completion(0xc0003dce78?, {0x1b8a3d0, 0xc00006fa40}, 0xc000d34f00)
	github.com/bufbuild/buf/private/buf/buflsp/server.go:419 +0x8c
go.lsp.dev/protocol.serverDispatch({0x1b8a3d0, 0xc00006fa40}, {0x1be18d0, 0xc0000942f0}, 0xc000e73ec8, {0x2aaaf2023c10, 0xc000558f00})
	go.lsp.dev/protocol@v0.12.0/server.go:206 +0x3744
github.com/bufbuild/buf/private/buf/buflsp.(*lsp).newHandler.ServerHandler.func2({0x1b8a3d0, 0xc00006fa40}, 0xc000e73ec8, {0x2aaaf2023c10, 0xc000558f00})
	go.lsp.dev/protocol@v0.12.0/server.go:36 +0x98
github.com/bufbuild/buf/private/buf/buflsp.(*lsp).newHandler.func1({0x1b8a3d0, 0xc00006fa40}, 0xc000842cc0, {0x2aaaf2023c10, 0xc000558f00})
	github.com/bufbuild/buf/private/buf/buflsp/buflsp.go:145 +0x298
github.com/bufbuild/buf/private/buf/buflsp.(*lsp).newHandler.AsyncHandler.func3.2()
	go.lsp.dev/jsonrpc2@v0.10.0/handler.go:114 +0x78
created by github.com/bufbuild/buf/private/buf/buflsp.(*lsp).newHandler.AsyncHandler.func3 in goroutine 9
	go.lsp.dev/jsonrpc2@v0.10.0/handler.go:112 +0x190
[Error - 10:50:51 AM] Server process exited with code 2.

buf version: 1.60.0
extension version: 0.8.1

Version: 1.106.0
Commit: ac4cbdf48759c7d8c3eb91ffe6bb04316e263c57
Date: 2025-11-11T16:02:25.943Z
Electron: 37.7.0
ElectronBuildId: 12597478
Chromium: 138.0.7204.251
Node.js: 22.20.0
V8: 13.8.258.32-electron.0
OS: Darwin arm64 24.6.0

[alebar42]

VSCode v1.150.1
VSCode Buf Extension v0.8.1
Buf v1.60.0
WSL2 Ubuntu 24.04.1 LTS

panic: runtime error: index out of range [21] with length 21

goroutine 23 [running]:
github.com/bufbuild/protocompile/experimental/source.(*File).LineOffsets(...)
/home/alebar/go/pkg/mod/github.com/bufbuild/protocompile@v0.14.2-0.20251112213711-9afd4296dfe2/experimental/source/file.go:153
github.com/bufbuild/protocompile/experimental/source.inverseLocation(0xc000c965a0, 0x15, 0x2, 0x1)
/home/alebar/go/pkg/mod/github.com/bufbuild/protocompile@v0.14.2-0.20251112213711-9afd4296dfe2/experimental/source/file.go:213 +0x23d
github.com/bufbuild/protocompile/experimental/source.(*File).InverseLocation(0x1d?, 0x15, 0x2, 0x1b91b00?)
/home/alebar/go/pkg/mod/github.com/bufbuild/protocompile@v0.14.2-0.20251112213711-9afd4296dfe2/experimental/source/file.go:114 +0x2e
github.com/bufbuild/buf/private/buf/buflsp.positionToOffset(...)
/home/alebar/go/pkg/mod/github.com/bufbuild/buf@v1.60.0/private/buf/buflsp/completion.go:1581
github.com/bufbuild/buf/private/buf/buflsp.getCompletionItems({0x2216c30, 0xc0003bce40}, 0xc0001f02c8, {0x8000?, 0x0?})
/home/alebar/go/pkg/mod/github.com/bufbuild/buf@v1.60.0/private/buf/buflsp/completion.go:59 +0x85
github.com/bufbuild/buf/private/buf/buflsp.(*server).Completion(0xc000d52e60?, {0x2216c30, 0xc0003bce40}, 0xc000f2bb30)
/home/alebar/go/pkg/mod/github.com/bufbuild/buf@v1.60.0/private/buf/buflsp/server.go:419 +0x6b
go.lsp.dev/protocol.serverDispatch({0x2216c30, 0xc0003bce40}, {0x227b878, 0xc0009820c0}, 0xc000f8bec0, {0x7f8f407421f0, 0xc000ca22c0})
/home/alebar/go/pkg/mod/go.lsp.dev/protocol@v0.12.0/server.go:206 +0x3ed3
github.com/bufbuild/buf/private/buf/buflsp.(*lsp).newHandler.ServerHandler.func2({0x2216c30, 0xc0003bce40}, 0xc000f8bec0, {0x7f8f407421f0, 0xc000ca22c0})
/home/alebar/go/pkg/mod/go.lsp.dev/protocol@v0.12.0/server.go:36 +0x7d
github.com/bufbuild/buf/private/buf/buflsp.(*lsp).newHandler.func1({0x2216c30, 0xc0003bce40}, 0xc000d42288, {0x7f8f407421f0, 0xc000ca22c0})
/home/alebar/go/pkg/mod/github.com/bufbuild/buf@v1.60.0/private/buf/buflsp/buflsp.go:145 +0x323
github.com/bufbuild/buf/private/buf/buflsp.(*lsp).newHandler.AsyncHandler.func3.2()
/home/alebar/go/pkg/mod/go.lsp.dev/jsonrpc2@v0.10.0/handler.go:114 +0x76
created by github.com/bufbuild/buf/private/buf/buflsp.(*lsp).newHandler.AsyncHandler.func3 in goroutine 16
/home/alebar/go/pkg/mod/go.lsp.dev/jsonrpc2@v0.10.0/handler.go:112 +0x165
[Error - 10:19:00 AM] The Buf Language Server server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.
[Error - 10:19:00 AM] Server process exited with code 2.
[Error - 10:19:00 AM] Delivering pending changes failed
TypeError: this.task is not a function
at /home/alebar/.vscode-server/extensions/bufbuild.vscode-buf-0.8.1/node_modules/vscode-languageclient/lib/common/utils/async.js:28:35

[emcfarlane]

Has been fixed in v1.61. release.