cmd/compile: bug in cmd/compile/internal/types.NewNamed

[prattmic]

Issue created by stacks.

This stack 74NgnA was reported by telemetry:

• compile/bug
• cmd/compile/internal/base.FatalfAt:+3
• cmd/compile/internal/base.Fatalf:=195
• cmd/compile/internal/gc.handlePanic:+7
• runtime.gopanic:+50
• runtime.panicmem:=262
• runtime.sigpanic:+19
• cmd/compile/internal/types.NewNamed:+8
• cmd/compile/internal/noder.(*pkgReader).objIdxMayFail:+129
• cmd/compile/internal/noder.(*pkgReader).objIdx:+1
• cmd/compile/internal/noder.(*pkgReader).objInstIdx:+8
• cmd/compile/internal/noder.(*reader).obj:+1
• cmd/compile/internal/noder.(*reader).doTyp:+9
• cmd/compile/internal/noder.(*pkgReader).typIdx:=429
• cmd/compile/internal/noder.(*reader).typWrapped:+1
• cmd/compile/internal/noder.(*reader).typ:=382
• cmd/compile/internal/noder.(*reader).structType:+3

cmd/compile@go1.23.2 go1.23.2 linux/amd64  (1)

[gabyhelp]

Related Issues

• cmd/compile: bug in cmd/compile/internal/noder.(*pkgReader).objIdxMayFail #70997
• cmd/compile: bug in cmd/compile/internal/noder.(*reader).localIdent #70998
• cmd/compile: bug in cmd/compile/internal/importer.(*reader).pkg #71000
• cmd/compile: bug in cmd/compile/internal/importer.(*pkgReader).objIdx.func1 #70996
• cmd/compile: Unified IR failed to compile recursive generic type #54722 (closed)
• cmd/compile: bug in cmd/compile/internal/staticdata.WriteEmbed #70995 (closed)
• cmd/compile: assertion failure when building syntax package with gotypesalias enabled #66873 (closed)
• cmd/compile: bug in cmd/compile/internal/ssa.copyelimValue #70999
• cmd/compile: unreachable panic with GODEBUG=gotypesalias=1 #65778 (closed)
• cmd/compile: internal compiler error: panic: unexpected type: 10 with GOEXPERIMENT=unified #52124 (closed)

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[prattmic]

The stack is slightly different, but in both this issue and #70997 it appears that sym.Pkg must be nil.