The attached test_vimrc.vim sets up a command that (on Windows)
generates  a tags file asynchronously and then calls back into Vim using
--remote-expr to add that tags file to the 'tags' option.

The test_vimrc.vim also sets the 'cscopetag' option to enable selecting
between multiple tag matches.

After sourcing this test file, I can reliably make Vim crash as follows
(edit the "let ctags_exec" line to match your own exuberant ctags path):

1. cd to a project top-level directory with at least one large code
   subdirectory following C/C++ coding practices of having function
   declarations separate from function definitions.
2. Execute the :Ctags command and wait for it to finish
3. cd into the large code subdirectory and edit a code file
4. Go to a function call within the code file
5. Execute the :Ctags command again, but don't wait for it to finish
6. Before the tags processing completes, use CTRL-] to select the tag
   for the function your cursor is on (presumably, you will have 2
   matches, one for the function prototype and one for the function
   definition)
7. Wait for the :Ctags command to finish
8. Try entering a number to select the tag to jump to
9. Vim crashes

I'm using gvim 7.4.629 64-bit on Windows 7. I do have a couple custom
patches applied but nothing affecting tags processing.

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