Vim hangs and consums 24% of CPU

[wolfv]

This is a weird bug.

When the attached test_vim.txt file is opened in Vim, and scrolled down to line 372, Vim hangs and consumes 24% of CPU.
This only happens with the attached vimrc and test_vim.txt. All other files I tried work nice with the attached vimrc.

The test_vim.txt file works nice if it is:

* opened in less

* opened in vi

* opened in Vim with the last 7 lines of the attached vimrc commented

The test_vim.txt file also works nice if a blank line is inserted on line 372 like this:

FILE_CONTENT FILE_CONTENT FILE_CONTENT

http://www.linux4windows.com/Articles/linux_concepts_for_beginners5.html

The attached test_vim.txt file is 504 lines long.
I have reproduced the bug by copying lines 360 to line 375 into a new file, but it only hangs for a couple seconds. And does not hang if the last 7 lines of the vimrc are commented.

I am running Vim version 7.4.6.40 on Linux Fedora 22 on hardware Haswell Intel NUC Kit D54250WYK.

Thank you.

[Christian Brabandt]

1) Try to reproduce according to the description here:
http://vimhelp.appspot.com/vim_faq.txt.html#faq-2.5

2) I suspect, markdown syntax highlighting is causing this problem for
you.
(since it goes away, if you disable setting the filetype)
You can check with the :syntime command, which pattern is slow
(see :h :syntime) and also you might want to try to switch to the old
re-engine (:set re=1 see :h two-engines), to see if this makes a
difference.
If this is the case, contact the maintainer of the markdown syntax file.
He can likely assist on how to proceed and hopefully fix the syntax
file.

Best,
Christian

[Shlomi Fish]

Dear wolfv,

On Wed, 1 Jul 2015 18:14:47 -0700 (PDT)
wolfv <wolf...@gmail.com> wrote:

> This is a weird bug.
>
> When the attached test_vim.txt file is opened in Vim, and scrolled down to
> line 372, Vim hangs and consumes 24% of CPU. This only happens with the
> attached vimrc and test_vim.txt. All other files I tried work nice with the
> attached vimrc.
>

I tried running Vim with that .vimrc and that file here (= Mageia Linux x86-64
6), but ran into a problem:

«««
[kdetest@telaviv1 ~]$ gvim test_vim.txt
Error detected while processing /home/kdetest/.vimrc:
line 6:
E117: Unknown function: vundle#begin
line 11:
E492: Not an editor command: Plugin 'gmarik/Vundle.vim'
line 13:
E492: Not an editor command: Bundle 'gabrielelana/vim-markdown'
line 14:
E492: Not an editor command: Plugin 'xolox/vim-misc'
line 15:
E492: Not an editor command: Plugin 'xolox/vim-shell'
line 18:
E117: Unknown function: vundle#end
No protocol specified

E233: cannot open display
E852: The child process failed to start the GUINo protocol specified

Press ENTER or type command to continue
[kdetest@telaviv1 ~]$
»»»

Can you provide a tarball (see
https://en.wikipedia.org/wiki/Tar_%28computing%29 ) with all the necessary files
needed to reproduce it?

> I am running Vim version 7.4.6.40 on Linux Fedora 22 on hardware Haswell
> Intel NUC Kit D54250WYK.
>

Ah , I see - I almost missed this information.

> Thank you.
>


Regards,

Shlomi Fish


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[Wolfram Volpi]

Shlomi Fish, thanks for the "Error detected while processing /home/kdetest/.vimrc" messages.

So I commented line 13 of the vimrc file:

    Bundle 'gabrielelana/vim-markdown'

And the problem went away.

Christian, you where right, I will contact the maintainer of that markdown syntax file.

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[BPJ]

Den 2015-07-02 12:22, Wolfram Volpi skrev:
> Shlomi Fish, thanks for the "Error detected while processing
> /home/kdetest/.vimrc" messages.
> So I commented line 13 of the vimrc file:
> Bundle 'gabrielelana/vim-markdown'
> And the problem went away.
>
> Christian, you where right, I will contact the maintainer of that markdown
> syntax file.
>

You may want to try vim-pandoc-syntax with or without vim-pandoc
(and pandoc!) instead. I use them *all the time* without any such
problems.

https://github.com/vim-pandoc/vim-pandoc-syntax
https://github.com/vim-pandoc/vim-pandoc
https://github.com/jgm/pandoc