Youcompleteme: Python Crashes

[jillesme]

After updating YCM today, Python crashes after opening Vim. (MacVim latest)

This is the complete error log:
http://pastebin.com/3WV59EQi

I've added 2 screenshots:
http://jilles.me/YCM_Python/1.png
http://jilles.me/YCM_Python/2.png

[Valloric]

Please sync and re-compile then try it out.

[jillesme]

@Valloric Python still crashes when I open the MacVim.app, however if I open it from the terminal everything works fine.

Any idea why this is?

[Valloric]

Then it's not a YCM bug, but a configuration issue with your OS/YCM installation/MacVim.

Out of ideas, sorry.

[maxbrunsfeld]

I see this too on commit 0a05ba8c212c6c1e84b6286bf4b2020db7042bcd

[jillesme]

@Valloric

Python still keeps crashing but I can't live without my YCM. It is a YCM error for sure because when I remove YCM this doesn't happen.

I wondered if it's a Python error after all but it isn't because UltiSnips does work and uses Python if I'm right.

I created a video to demonstrate what keeps happening: http://www.youtube.com/watch?v=SNnpx3dBqIs

The video is only 2 minutes long! I have asked the guys on the #vim irc but they have no clue either

[Valloric]

I don't really know what to tell you; I can't repro this on any machine and neither can anyone else because otherwise the issue tracker would be brimming with people reporting the same problem over and over again. So it _is_ somehow related to your system configuration.

OS X 10.9 is still brand-new and MacVim has no official release for it; I'd put my money on this being a problem with running a 10.8 MacVim on 10.9. There's a thread tracking the progress of MacVim for 10.9 here: https://groups.google.com/forum/#!topic/vim_mac/5kVAMSPb6uU

[colorfulgrayscale]

This happens on my Mavericks+Macvim setup as well.

Python crashes and YCM server shuts down with

Fatal Python error: PyThreadState_Get: no current thread

Does not happen in the console VIM.

[Valloric]

It appears there is an official build of MacVim, it's just not at the usual place (on Google Code): https://github.com/b4winckler/macvim/releases

Try using that.

[colorfulgrayscale]

I tried MacVim Snapshot 72, seems like it has the same problem.

Fatal Python error: PyThreadState_Get: no current thread
Vim: Caught deadly signal ABRT
Vim: Finished.

My python was compiled from homebrew. jillesme's python looks like the stock one that comes with Mavericks.

[maxbrunsfeld]

I see this error on Mac OS 10.8 with MacVim snapshots 71 and 72 from here. My stack trace reads:

0   libsystem_kernel.dylib          0x00007fff84bf7d46 __kill + 10
1   libsystem_c.dylib               0x00007fff8cedadf0 abort + 177
2   org.python.python               0x0000000108e27eaa Py_FatalError + 49
3   org.python.python               0x0000000108e26370 PyThreadState_Get + 28
4   org.python.python               0x0000000108e21f16 Py_InitModule4_64 + 58
5   ycm_core.so                     0x0000000108c09a84 boost::python::detail::init_module(char const*, void (*)()) + 36

[ming-codes]

I get this error with python 2.7.6 from homebrew.

YCM runs fine with OS X's stock 2.7.5

[koepsell]

I had the same problem running YCM on OSX Mavericks with homebrew python. At first vim was crashing, however using the suggestion from
https://github.com/Valloric/YouCompleteMe/issues/18#issuecomment-13150914 and setting the environment variables DYLD_FORCE_FLAT_NAMESPACE=1 and DYLD_INSERT_LIBRARIES=/usr/local/Cellar/python/2.7.6/Frameworks/Python.framework/Versions/2.7/lib/libpython2.7.dylib vim would start up, but the YCM server would still crash. After removing the DYLD_INSERT_LIBRARIES and only using DYLD_FORCE_FLAT_NAMESPACE=1,
the issue was resolved and I am now successfully running YCM with homebrew python

[raine]

Installed 2.7.6 with brew (on Mountain Lion) and Python started to crash on vim startup.

[ahayman]

Also having the same problem. Updated YCM, installed/compiled it and now Python crashes on startup. Using Mavericks and Python 2.7.6. YCM worked fine until this.

[fourcolors]

I'm getting the same thing (breaking). Using Mavericks and Python 2.7.6.

[fourcolors]

Ok so checkout this: https://github.com/Homebrew/homebrew/issues/17908

specifically "Please brew update, uninstall python, uninstall macvim, reinstall python and macvim and if it's still an issue please create a new one."

That should fix it.

Oh and don't forget to recompile ycm, it needs to compile with the new Python.

[counterbeing]

Just wanted to confirm that this worked great for me :)
But I'm using plain ol' vim.
Thanks @fourcolors

If your setup is like mine, a quick copy paste should do the trick...

brew update; brew uninstall python; brew uninstall vim; brew install python; brew install vim;
~/.vim/bundle/YouCompleteMe/install.sh

[AsaHe]

brew update; brew uninstall python; brew uninstall vim; brew install python; brew install vim;
~/.vim/bundle/YouCompleteMe/install.sh

Works for me. Thanks.

[payneseu]

thanks, @koepsell,
export DYLD_FORCE_FLAT_NAMESPACE=1 works for me.
I don't know why, but it indeed works now. I am using osx 10.10.5, and the latest youcompleteme.
vim is installed by homebrew, used the system python, not homebrew.
many thanks

[urinieto]

Thanks @koepsell and @payneseu, this solution worked for me too.

[kazewind22]

YCM crashes after I use brew python.
Thanks @koepsell @payneseu and @urinieto, the solution works well for me by adding two lines to .zshrc file.

• # Fix python crash with vim and YCM plugin
• export DYLD_FORCE_FLAT_NAMESPACE=1

[RussellBradley]

thanks @koepsell, had the same problem with python crashing. This fixed it.
export DYLD_FORCE_FLAT_NAMESPACE=1

[bearlin]

I've apply 'export DYLD_FORCE_FLAT_NAMESPACE=1' but this issue still there with macOS Sierra 10.12.1(16B2555)

[drafly]

@bearlin You are right. The issue still there with OS sierra when I restart the iterm2.
Try: brew update; brew uninstall python; brew uninstall vim; brew install python; brew install vim; then recompile the YCM.
It works for me.