[llvm-bugs] [Bug 47641] New: Crash in clang::Sema::CreateBuiltinBinOp during clangd 11.0.0 background indexing of Firefox

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47641

            Bug ID: 47641
           Summary: Crash in clang::Sema::CreateBuiltinBinOp during clangd
                    11.0.0 background indexing of Firefox
           Product: clang
           Version: unspecified
          Hardware: Macintosh
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mstange at themasta.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Created attachment 24000
  --> https://bugs.llvm.org/attachment.cgi?id=24000&action=edit
crash stack

I don't have steps to reproduce here unfortunately.
I have a Firefox build on macOS and am using clangd with VSCode for Firefox
development. clangd keeps crashing in the background during indexing. I
attached lldb and captured the stack for one of these crashes.

I'm using clangd version 11.0.0.

Top 4 frames of the crash:

> * thread #6, name = 'background-worker-5', stop reason = EXC_BAD_ACCESS (code=2, address=0x700000ec7e80)
>   * frame #0: 0x00000001102cce6e libclang-cpp.dylib`clang::Sema::CreateBuiltinBinOp(clang::SourceLocation, clang::BinaryOperatorKind, clang::Expr*, clang::Expr*) + 46
>     frame #1: 0x00000001102d2509 libclang-cpp.dylib`clang::Sema::BuildBinOp(clang::Scope*, clang::SourceLocation, clang::BinaryOperatorKind, clang::Expr*, clang::Expr*) + 297
>     frame #2: 0x00000001106034a0 libclang-cpp.dylib`clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformBinaryOperator(clang::BinaryOperator*) + 144
>     frame #3: 0x000000011060ea51 libclang-cpp.dylib`clang::TreeTransform<(anonymous namespace)::TemplateInstantiator>::TransformTemplateArgument(clang::TemplateArgumentLoc const&, clang::TemplateArgumentLoc&, bool) + 177

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