x/tools/gopls: gopls crash with vscode-go in remote development

[wdcui]

What version of Go are you using (go version)?

$ go version

go1.14.4

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

Ubuntu on WSL 2.
gopls-error.txt

go env Output

$ go env
GO111MODULE=""

GOARCH="amd64"

GOBIN=""

GOCACHE="/home/wdcui/.cache/go-build"

GOENV="/home/wdcui/.config/go/env"

GOEXE=""

GOFLAGS=""

GOHOSTARCH="amd64"

GOHOSTOS="linux"

GOINSECURE=""

GONOPROXY=""

GONOSUMDB=""

GOOS="linux"

GOPATH="/home/wdcui/go"

GOPRIVATE=""

GOPROXY="https://proxy.golang.org,direct"

GOROOT="/usr/local/go"

GOSUMDB="sum.golang.org"

GOTMPDIR=""

GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"

GCCGO="gccgo"

AR="ar"

CC="gcc"

CXX="g++"

CGO_ENABLED="1"

GOMOD="/home/wdcui/repo/VMEnclaves/cvm-runtime/go.mod"

CGO_CFLAGS="-g -O2"

CGO_CPPFLAGS=""

CGO_CXXFLAGS="-g -O2"

CGO_FFLAGS="-g -O2"

CGO_LDFLAGS="-g -O2"

PKG_CONFIG="pkg-config"

GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build196659605=/tmp/go-build -gno-record-gcc-switches"

What did you do?

What did you expect to see?

What did you see instead?

[stamblerre]

Thanks for the report! Pasting the stack trace here so it's easier to find:

panic: parse "file://wsl%24/Ubuntu/home/wdcui/repo/VMEnclaves/cvm-runtime": invalid URL escape "%24"

goroutine 99 [running]:
golang.org/x/tools/internal/span.URI.Filename(0xc000223840, 0x3b, 0x5, 0xe)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/span/uri.go:32 +0xcd
golang.org/x/tools/internal/lsp/cache.(*view).setBuildInformation(0xc0000f82c0, 0xe38620, 0xc000428c90, 0xc000223840, 0x3b, 0xc0000f0000, 0x3c, 0x70, 0x5f5e101, 0x0, ...)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/lsp/cache/view.go:616 +0x62
golang.org/x/tools/internal/lsp/cache.(*Session).createView(0xc0000a4c60, 0xe38620, 0xc000428c90, 0xc0003cef50, 0xb, 0xc000223840, 0x3b, 0x4000000000000000, 0x10101, 0xc0003ceea8, ...)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/lsp/cache/session.go:145 +0x4fc
golang.org/x/tools/internal/lsp/cache.(*Session).NewView(0xc0000a4c60, 0xe38620, 0xc000428c90, 0xc0003cef50, 0xb, 0xc000223840, 0x3b, 0x4000000000000000, 0x10101, 0xc0003ceea8, ...)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/lsp/cache/session.go:95 +0x132
golang.org/x/tools/internal/lsp.(*Server).addView(0xc000099380, 0xe38620, 0xc000428c90, 0xc0003cef50, 0xb, 0xc000223840, 0x3b, 0x0, 0x0, 0x0, ...)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/lsp/workspace.go:42 +0x1eb
golang.org/x/tools/internal/lsp.(*Server).addFolders(0xc000099380, 0xe38620, 0xc000428c90, 0xc000214e00, 0x1, 0x4)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/lsp/general.go:190 +0x18b
golang.org/x/tools/internal/lsp.(*Server).initialized(0xc000099380, 0xe38620, 0xc000428c90, 0x1390e70, 0x0, 0x0)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/lsp/general.go:178 +0x3ab
golang.org/x/tools/internal/lsp.(*Server).Initialized(0xc000099380, 0xe38620, 0xc000428c90, 0x1390e70, 0x1390e70, 0x0)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/lsp/server_gen.go:112 +0x50
golang.org/x/tools/internal/lsp/protocol.ServerHandler.func1(0xe38620, 0xc000428c90, 0xc0003e9380, 0x275142f0, 0xc000428c30, 0x0, 0x0)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/lsp/protocol/tsserver.go:98 +0x7bf
golang.org/x/tools/internal/lsp/lsprpc.handshaker.func1(0xe38620, 0xc000428c90, 0xc0003e9380, 0x275142f0, 0xc000428c30, 0x0, 0x0)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/lsp/lsprpc/lsprpc.go:531 +0x558
golang.org/x/tools/internal/jsonrpc2.MustReplyHandler.func1(0xe38620, 0xc000428c90, 0xc0000c9ec0, 0x275142f0, 0xc000428c30, 0x0, 0x0)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/jsonrpc2/handler.go:35 +0xda
golang.org/x/tools/internal/jsonrpc2.AsyncHandler.func1.2(0xc000094c60, 0xc0004290b0, 0xc00008b7d0, 0xe38620, 0xc000428c90, 0xc0000c9ec0, 0x275142f0, 0xc000428c30)
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/jsonrpc2/handler.go:103 +0x8d
created by golang.org/x/tools/internal/jsonrpc2.AsyncHandler.func1
	C:/Users/wdcui/go/pkg/mod/golang.org/x/tools@v0.0.0-20200513154647-78b527d18275/internal/jsonrpc2/handler.go:100 +0x178
[Error - 11:39:32 AM] Connection to server got closed. Server will not be restarted.

/cc @heschik

[wdcui]

I spent some time poking around this bug.

The path to the WSL folder has "wsl$". Somewhere in the callstack, it's converted to %24. However, net/url doesn't think "$" should be escaped. This inconsistency caused net/url to return an error and then span.URI.FileName calls panic.

I wasn't able to figure out what code converts "$" to "%24".

[stamblerre]

Thanks for looking into this! VS Code seems to over-escape characters in a number of cases, and I believe we already ran into this with %. I believe our code has changed a lot since we fixed that case, so I'll let @heschik suggest what the right fix is.

[heschik]

The file URL is invalid in a new way: it only has two slashes. It should be file:///wsl%24/Ubuntu/home/wdcui/repo/VMEnclaves/cvm-runtime.

I guess we can try to fix up this too.

[gopherbot]

Change https://golang.org/cl/239743 mentions this issue: internal/span: handle file URLs with two slashes