[lldb-dev] Large core files causing issues in LLDB

Greg Clayton via lldb-dev lldb-dev at lists.llvm.org
Tue Sep 11 09:59:13 PDT 2018

In LLDB we try to mmap any object file we load including core files. Recently I received a 468GB core file. mmap fails in LLVM and then it will fall back to trying to allocate a memory buffer that large and reading a file into it.

The failing call occurs in:

DataBufferSP ObjectFile::MapFileData(const FileSpec &file, uint64_t Size,
                                     uint64_t Offset) {
  return DataBufferLLVM::CreateSliceFromPath(file.GetPath(), Size, Offset);

Does LLVM have any class that could help deal with really large files and randomly accessing data within it?

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