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x/tools/gopls: EXCEPTION_ACCESS_VIOLATION panic in Signature.RecvTypeParams #81102
Description
#!stacks
"sigpanic" && "(*Signature).RecvTypeParams" && "iexportCommon:+62" && "GOOS=windows"
Issue created by stacks.
Possible memory corruption? sig is either nil (impossible for a method) or invalid (due to hardware fault).
More concerning is the apparent off-by-one line numbering.
sig, _ := m.Type().(*types.Signature)
// Receiver type parameters are type arguments of the receiver type, so
// their name must be qualified before exporting recv.
if rparams := sig.RecvTypeParams(); rparams.Len() > 0 {This stack -hIFIQ was reported by telemetry:
crash/crashruntime.gopanic:+69,+0x167golang.org/x/tools/internal/gcimporter.iexportCommon.func1:+14,+0xc6runtime.gopanic:+50,+0x131runtime.panicmem:=262,+0x197runtime.sigpanic:+9,+0x167go/types.(*Signature).RecvTypeParams:=112,+0x999golang.org/x/tools/internal/gcimporter.(*iexporter).doDecl:+132,+0x9b6golang.org/x/tools/internal/gcimporter.iexportCommon:+62,+0x39cgolang.org/x/tools/internal/gcimporter.IExportShallow:+8,+0x73golang.org/x/tools/gopls/internal/cache.(*typeCheckBatch).checkPackageForImport.func3:+1,+0x49runtime.goexit:+0,+0x0
golang.org/x/tools/gopls@v0.21.1 go1.25.7 windows/amd64 gopls.client=vscode (1)
Use this command to reproduce the executable:
(HOME=$(mktemp -d); GOOS=windows GOARCH=amd64 GOTOOLCHAIN=go1.25.7 go install golang.org/x/tools/gopls@v0.21.1 && find $HOME/go/bin -type f)
To disassemble: go tool objdump exe | less
Dups: d9TIig
Activity
adonovan commentedon Aug 25, 2026
Found new stacks for predicate:
This stack
d9TIigwas reported by telemetry:gopls/buggolang.org/x/tools/gopls/internal/util/bug.report:+35,+0x40dgolang.org/x/tools/gopls/internal/util/bug.Reportf:+1,+0x24golang.org/x/tools/internal/gcimporter.iexportCommon.func1:+4,+0x67runtime.gopanic:+50,+0x131runtime.panicmem:=262,+0x197runtime.sigpanic:+9,+0x167go/types.(*Signature).RecvTypeParams:=112,+0x999golang.org/x/tools/internal/gcimporter.(*iexporter).doDecl:+132,+0x9b6golang.org/x/tools/internal/gcimporter.iexportCommon:+62,+0x39cgolang.org/x/tools/internal/gcimporter.IExportShallow:+8,+0x73golang.org/x/tools/gopls/internal/cache.(*typeCheckBatch).checkPackageForImport.func3:+1,+0x49runtime.goexit:+0,+0x0Use this command to reproduce the executable:
(HOME=$(mktemp -d); GOOS=windows GOARCH=amd64 GOTOOLCHAIN=go1.25.7 go install golang.org/x/tools/gopls@v0.21.1 && find $HOME/go/bin -type f)To disassemble:
go tool objdump exe | lessgopherbot commentedon Aug 25, 2026
Change https://go.dev/cl/821200 mentions this issue:
x/tools: assert that *types.Signature is non-nilx/tools: assert that *types.Signature is non-nil