Youcompleteme: After ycm loaded, vim will crash.

[chinanoahli]

Issue Prelude

Please complete these steps and check these boxes (by putting an x inside
the brackets) _before_ filing your issue:

• [x] I have read and understood YCM's CONTRIBUTING document.
• [x] I have read and understood YCM's CODE_OF_CONDUCT document.
• [x] I have read and understood YCM's README, especially the
  Frequently Asked Questions section.
• [x] I have searched YCM's issue tracker to find issues similar to the one I'm
  about to report and couldn't find an answer to my problem. (Example Google
  search.)
• [x] If filing a bug report, I have included the output of vim --version.
• [ ] If filing a bug report, I have included the output of :YcmDebugInfo.
• [ ] If filing a bug report, I have attached the contents of the logfiles using
  the :YcmToggleLogs command.
• [x] If filing a bug report, I have included which OS (including specific OS
  version) I am using.
• [ ] If filing a bug report, I have included a minimal test case that reproduces
  my issue, including what I expected to happen and what actually happened.
• [x] If filing a installation failure report, I have included the entire output
  of install.py (or cmake/make/ninja) including its invocation
• [x] I understand this is an open-source project staffed by volunteers and
  that any help I receive is a selfless, heartfelt _gift_ of their free time. I
  know I am not entitled to anything and will be polite and courteous.
• [x] I understand my issue may be closed if it becomes obvious I didn't
  actually perform all of these steps.

Thank you for adhering to this process! It ensures your issue is resolved
quickly and that neither your nor our time is needlessly wasted.

Issue Details

Provide a clear description of the problem, including the following key
questions: After ycm loaded, vim will crash.

• What did you do?
  Upgrade macos to 10.15
  Upgrade vim to VIM - Vi IMproved 8.1 (2018 May 18, compiled Sep 30 2019 02:59:45)
  And I found ycm will causing vim crash after it load(i can not open vim if ycm loaded)
  So I remove the ycm plugin folder, and re-pull and reinstall it again(install.py was tried on python2 and python3)
  But the situation did not change

• What actually happened?
  After ycm loaded, vim will crash.

Diagnostic data

Output of vim --version

VIM - Vi IMproved 8.1 (2018 May 18, compiled Sep 30 2019 02:59:45)
macOS version
Included patches: 1-2100
Compiled by Homebrew
Huge version without GUI.  Features included (+) or not (-):
+acl               -farsi             -mouse_sysmouse    -tag_any_white
+arabic            +file_in_path      +mouse_urxvt       -tcl
+autocmd           +find_in_path      +mouse_xterm       +termguicolors
+autochdir         +float             +multi_byte        +terminal
-autoservername    +folding           +multi_lang        +terminfo
-balloon_eval      -footer            -mzscheme          +termresponse
+balloon_eval_term +fork()            +netbeans_intg     +textobjects
-browse            +gettext           +num64             +textprop
++builtin_terms    -hangul_input      +packages          +timers
+byte_offset       +iconv             +path_extra        +title
+channel           +insert_expand     +perl              -toolbar
+cindent           +job               +persistent_undo   +user_commands
-clientserver      +jumplist          +postscript        +vartabs
+clipboard         +keymap            +printer           +vertsplit
+cmdline_compl     +lambda            +profile           +virtualedit
+cmdline_hist      +langmap           -python            +visual
+cmdline_info      +libcall           +python3           +visualextra
+comments          +linebreak         +quickfix          +viminfo
+conceal           +lispindent        +reltime           +vreplace
+cryptv            +listcmds          +rightleft         +wildignore
+cscope            +localmap          +ruby              +wildmenu
+cursorbind        +lua               +scrollbind        +windows
+cursorshape       +menu              +signs             +writebackup
+dialog_con        +mksession         +smartindent       -X11
+diff              +modify_fname      -sound             -xfontset
+digraphs          +mouse             +spell             -xim
-dnd               -mouseshape        +startuptime       -xpm
-ebcdic            +mouse_dec         +statusline        -xsmp
+emacs_tags        -mouse_gpm         -sun_workshop      -xterm_clipboard
+eval              -mouse_jsbterm     +syntax            -xterm_save
+ex_extra          +mouse_netterm     +tag_binary
+extra_search      +mouse_sgr         -tag_old_static
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
  fall-back for $VIM: "/usr/local/share/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H   -DMACOS_X -DMACOS_X_DARWIN  -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: clang   -L. -fstack-protector-strong -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/[email protected]/lib -L/usr/local/opt/readline/lib  -L/usr/local/lib -o vim        -lncurses -liconv -lintl -framework AppKit  -L/usr/local/opt/lua/lib -llua5.3 -mmacosx-version-min=10.14 -fstack-protector-strong -L/usr/local/lib  -L/usr/local/Cellar/perl/5.30.0/lib/perl5/5.30.0/darwin-thread-multi-2level/CORE -lperl -lm -lutil -lc  -L/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/config-3.7m-darwin -lpython3.7m -framework CoreFoundation  -lruby.2.6

Output of YcmDebugInfo

I can not get this, vim crash immediately after ycm loaded.

Contents of YCM, ycmd and completion engine logfiles

Vim: Caught deadly signal ABRT
Error detected while processing function <SNR>82_OnVimLeave:Vim: Finished.

line    6:
Traceback (most recent call last):
  File "/Users/joshua/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 193, in Session
    return cls.session
AttributeError: type object 'BaseRequest' has no attribute 'session'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/Users/joshua/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 193, in Session
    return cls.session
AttributeError: type object 'BaseRequest' has no attribute 'session'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/joshua/.vim/bundle/YouCompleteMe/python/ycm/youcompleteme.py", line 498, in OnVimLeave
    self._ShutdownServer()
  File "/Users/joshua/.vim/bundle/YouCompleteMe/python/ycm/youcompleteme.py", line 283, in _ShutdownServer
    SendShutdownRequest()
  File "/Users/joshua/.vim/bundle/YouCompleteMe/python/ycm/client/shutdown_request.py", line 45, in SendShutdownRequest
    request.Start()
  File "/Users/joshua/.vim/bundle/YouCompleteMe/python/ycm/client/shutdown_request.py", line 39, in Start
    display_message = False )
  File "/Users/joshua/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 127, in PostDataToHandler
    BaseRequest.PostDataToHandlerAsync( data, handler, timeout ),
  File "/Users/joshua/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 137, in PostDataToHandlerAsync
    return BaseRequest._TalkToHandlerAsync( data, handler, 'POST', timeout )
  File "/Users/joshua/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 152, in _TalkToHandlerAsync
    return BaseRequest.Session().post(
  File "/Users/joshua/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 196, in Session
    from requests_futures.sessions import FuturesSession
ImportError: cannot import name 'FuturesSession' from 'requests_futures.sessions' (/Users/joshua/.vim/bundle/YouCompleteMe/third_party/requests-futures/requests_futures/sessions.py)
[1]    86684 abort      vim

OS version, distribution, etc.

macos 10.15

Output of build/install commands

run by python3

$python3 install.py
Searching Python 3.7 libraries...
Found Python library: /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/config-3.7m-darwin/libpython3.7.dylib
Found Python headers folder: /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/include/python3.7m
-- The C compiler identification is AppleClang 11.0.0.11000033
-- The CXX compiler identification is AppleClang 11.0.0.11000033
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PythonLibs: /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/config-3.7m-darwin/libpython3.7.dylib (found suitable version "3.7.4", minimum required is "3.5")
-- NOT using libclang, no semantic completion for C/C++/ObjC will be available
-- NOT using clang-tidy for static analysis.
-- Configuring done
-- Generating done
-- Build files have been written to: /private/var/folders/j7/q1wbf4190bd9zhyz1xswqb840000gn/T/ycm_build_7e9ort2c
Scanning dependencies of target BoostParts
[  2%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/codecvt_error_category.cpp.o
[  4%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/operations.cpp.o
[  7%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/path.cpp.o
[  9%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/path_traits.cpp.o
[ 11%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/portability.cpp.o
[ 14%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/unique_path.cpp.o
[ 16%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/utf8_codecvt_facet.cpp.o
[ 19%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/filesystem/src/windows_file_codecvt.cpp.o
[ 21%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/c_regex_traits.cpp.o
[ 23%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/cpp_regex_traits.cpp.o
[ 26%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/cregex.cpp.o
[ 28%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/fileiter.cpp.o
[ 30%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/icu.cpp.o
[ 33%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/instances.cpp.o
[ 35%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/posix_api.cpp.o
[ 38%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex.cpp.o
[ 40%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex_debug.cpp.o
[ 42%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex_raw_buffer.cpp.o
[ 45%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/regex_traits_defaults.cpp.o
[ 47%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/static_mutex.cpp.o
[ 50%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/usinstances.cpp.o
[ 52%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/w32_regex_traits.cpp.o
[ 54%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/wc_regex_traits.cpp.o
[ 57%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/wide_posix_api.cpp.o
[ 59%] Building CXX object BoostParts/CMakeFiles/BoostParts.dir/libs/regex/src/winstances.cpp.o
[ 61%] Linking CXX static library libBoostParts.a
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(windows_file_codecvt.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(icu.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(instances.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(regex_debug.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(usinstances.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(w32_regex_traits.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(winstances.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(windows_file_codecvt.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(icu.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(instances.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(regex_debug.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(usinstances.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(w32_regex_traits.cpp.o) has no symbols
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: file: libBoostParts.a(winstances.cpp.o) has no symbols
[ 61%] Built target BoostParts
Scanning dependencies of target ycm_core
[ 64%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Candidate.cpp.o
[ 69%] Building CXX object ycm/CMakeFiles/ycm_core.dir/CharacterRepository.cpp.o
[ 71%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Character.cpp.o
[ 71%] Building CXX object ycm/CMakeFiles/ycm_core.dir/CandidateRepository.cpp.o
[ 73%] Building CXX object ycm/CMakeFiles/ycm_core.dir/CodePoint.cpp.o
[ 76%] Building CXX object ycm/CMakeFiles/ycm_core.dir/CodePointRepository.cpp.o
[ 78%] Building CXX object ycm/CMakeFiles/ycm_core.dir/IdentifierCompleter.cpp.o
[ 80%] Building CXX object ycm/CMakeFiles/ycm_core.dir/IdentifierDatabase.cpp.o
[ 83%] Building CXX object ycm/CMakeFiles/ycm_core.dir/IdentifierUtils.cpp.o
[ 85%] Building CXX object ycm/CMakeFiles/ycm_core.dir/PythonSupport.cpp.o
[ 88%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Result.cpp.o
[ 90%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Utils.cpp.o
[ 92%] Building CXX object ycm/CMakeFiles/ycm_core.dir/Word.cpp.o
[ 95%] Building CXX object ycm/CMakeFiles/ycm_core.dir/versioning.cpp.o
[ 97%] Building CXX object ycm/CMakeFiles/ycm_core.dir/ycm_core.cpp.o
[100%] Linking CXX shared library /Users/joshua/.vim/bundle/YouCompleteMe/third_party/ycmd/ycm_core.so
[100%] Built target ycm_core
-- The C compiler identification is AppleClang 11.0.0.11000033
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Found PythonLibs: /usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/config-3.7m-darwin/libpython3.7.dylib (found version "3.7.4")
-- Configuring done
-- Generating done
-- Build files have been written to: /private/var/folders/j7/q1wbf4190bd9zhyz1xswqb840000gn/T/regex_build_t9bmxo5u
Scanning dependencies of target _regex
[ 66%] Building C object CMakeFiles/_regex.dir/regex_3/_regex_unicode.c.o
[ 66%] Building C object CMakeFiles/_regex.dir/regex_3/_regex.c.o
[100%] Linking C shared library /Users/joshua/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/cregex/regex_3/_regex.so
[100%] Built target _regex

[puremourning]

how did you install vim ? brew install vim ?

Could you try and start vim without ycm enabled and do :py3 import sys; print(sys.path)

[chinanoahli]

:py3 import sys; print(sys.path)

Yes, I installed vim by brew.

And the output inside vim was:

['/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python37.zip', '/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/li
b/python3.7', '/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/lib-dynload', '/usr/local/opt/python/Frameworks/Python.fra
mework/Versions/3.7/lib/python3.7/site-packages', '_vim_path_']

[puremourning]

that's strange; do you have some time to head to Gitter and chat ? It might be quicker to resolve that way , then report back here. i'm sure this can be easily fixed, but the problem isn't obvious right now; will need to do some poking. it's not unusual for things to randomly break with new major macOS releases, particularly when it comes to Python.

For example, i know that mccvim is broken on Catalina unless you install with brew install --HEAD macvim

[puremourning]

So I remove the ycm plugin folder, and re-pull and

just to be sure, could you confirm what commands you ran to re-pull ycm?

[chinanoahli]

So I remove the ycm plugin folder, and re-pull and

just to be sure, could you confirm what commands you ran to re-pull ycm?

I have free time now, but I don't know how to use gitter. I mean I deleted ~/.vim/bundle/YouCompleteMe, after that I pull ycm inside ~/.vim/bundle/.

[chinanoahli]

I had macvim(Custom Version 8.1.950 (155)), ycm seems fine in this version.
YcmDebugInfooutput

Printing YouCompleteMe debug information...
-- Client logfile: /var/folders/j7/q1wbf4190bd9zhyz1xswqb840000gn/T/ycm_rg6zj5gx.log
-- Server Python interpreter: /usr/local/opt/python/bin/python3.7
-- Server Python version: 3.7.4
-- Server has Clang support compiled in: False
-- Clang version: None
-- No extra configuration file found
-- Server running at: http://127.0.0.1:49736
-- Server process ID: 13236
-- Server logfiles:
--   /var/folders/j7/q1wbf4190bd9zhyz1xswqb840000gn/T/ycmd_49736_stdout_z2k72xvx.log
--   /var/folders/j7/q1wbf4190bd9zhyz1xswqb840000gn/T/ycmd_49736_stderr_0uvp50zz.log

:version in macvim output

VIM - Vi IMproved 8.1 (2018 May 18, compiled Feb 18 2019 23:51:40)
macOS version
Included patches: 1-950
Compiled by [email protected]
Huge version with MacVim GUI.  Features included (+) or not (-):
+acl               +cmdline_hist      +ex_extra          +jumplist          +mouse_dec         +path_extra        +startuptime       +title             -X11
+arabic            +cmdline_info      +extra_search      +keymap            -mouse_gpm         +perl/dyn          +statusline        +toolbar           -xfontset
+autocmd           +comments          -farsi             +lambda            -mouse_jsbterm     +persistent_undo   -sun_workshop      +transparency      +xim
+autochdir         +conceal           +file_in_path      +langmap           +mouse_netterm     +postscript        +syntax            +user_commands     -xpm
-autoservername    +cryptv            +find_in_path      +libcall           +mouse_sgr         +printer           +tag_binary        +vartabs           -xsmp
+balloon_eval      +cscope            +float             +linebreak         -mouse_sysmouse    +profile           +tag_old_static    +vertsplit         -xterm_clipboard
+balloon_eval_term +cursorbind        +folding           +lispindent        +mouse_urxvt       +python/dyn        -tag_any_white     +virtualedit       -xterm_save
+browse            +cursorshape       -footer            +listcmds          +mouse_xterm       +python3/dyn       -tcl               +visual
++builtin_terms    +dialog_con_gui    +fork()            +localmap          +multi_byte        +quickfix          +termguicolors     +visualextra
+byte_offset       +diff              +fullscreen        +lua/dyn           +multi_lang        +reltime           +terminal          +viminfo
+channel           +digraphs          -gettext           +menu              -mzscheme          +rightleft         +terminfo          +vreplace
+cindent           +dnd               -hangul_input      +mksession         +netbeans_intg     +ruby/dyn          +termresponse      +wildignore
+clientserver      -ebcdic            +iconv             +modify_fname      +num64             +scrollbind        +textobjects       +wildmenu
+clipboard         +emacs_tags        +insert_expand     +mouse             +odbeditor         +signs             +textprop          +windows
+cmdline_compl     +eval              +job               +mouseshape        +packages          +smartindent       +timers            +writebackup
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
  system gvimrc file: "$VIM/gvimrc"
    user gvimrc file: "$HOME/.gvimrc"
2nd user gvimrc file: "~/.vim/gvimrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
    system menu file: "$VIMRUNTIME/menu.vim"
  fall-back for $VIM: "/Applications/MacVim.app/Contents/Resources/vim"
Compilation: clang -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_MACVIM -Wall -Wno-unknown-pragmas -pipe  -DMACOS_X -DMACOS_X_DARWIN  -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: clang   -L. -fstack-protector-strong -L/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib -L. -fstack-protector-strong -L
/usr/local/lib -L/usr/local/opt/libyaml/lib -L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib  -L/usr/local/lib -o Vim -framework Cocoa -framework Carbon       -lm  -lncurse
s -liconv -framework AppKit   -fstack-protector  -L/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE

[puremourning]

https://gitter.im/Valloric/YouCompleteMe

You're not being clear enough to help debug this via GitHub comments. The solution is probably to brew reinstall vim, but i'm not 100% sure why.

[puremourning]

for the record, i have the exact same vim installed on catalina (from brew install vim) and it works fine, so this is likely something unique to your python environment that's tricky to track down.

[dvladek]

I had the same problem yesterday, after installing OS X Catalina from scratch. The issue is caused by MacVim. As @puremourning suggested, installing vim from brew solves the issue, just make sure that you brew link vim after the installation.

Catalina uses the /usr/local/share/man directory to store files with root ownership, so probably brew link failed, unless you have previously changed the ownership of the directory(ies).

This should solve the issue.

[chinanoahli]

I had the same problem yesterday, after installing OS X Catalina from scratch. The issue is caused by MacVim. As @puremourning suggested, installing vim from brew solves the issue, just make sure that you brew link vim after the installation.

Catalina uses the /usr/local/share/man directory to store files with root ownership, so probably brew link failed, unless you have previously changed the ownership of the directory(ies).

This should solve the issue.

I checked, /usr/local/share/man was own by me username:admin, also I ran sudo chown -R $(whoami) $(brew --prefix)/*, after that I brew reinstall vim,and that I unlink & relink vim manually, but this still can not solve the issue.

My issue was about vim from brew, not macvim, macvim in my system was fine.

[zyqhi]

I installed the HEAD version macvim. same crash

➜  client git:(master) ✗ Vim: Caught deadly signal ABRT
Error detected while processing function <SNR>144_OnVimLeave:Vim: Finished.

line    6:
Traceback (most recent call last):
  File "/Users/mutsu/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 193, in Session
    return cls.session
AttributeError: type object 'BaseRequest' has no attribute 'session'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/Users/mutsu/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 193, in Session
    return cls.session
AttributeError: type object 'BaseRequest' has no attribute 'session'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/mutsu/.vim/bundle/YouCompleteMe/python/ycm/youcompleteme.py", line 498, in OnVimLeave
    self._ShutdownServer()
  File "/Users/mutsu/.vim/bundle/YouCompleteMe/python/ycm/youcompleteme.py", line 283, in _ShutdownServer
    SendShutdownRequest()
  File "/Users/mutsu/.vim/bundle/YouCompleteMe/python/ycm/client/shutdown_request.py", line 45, in SendShutdownRequest
    request.Start()
  File "/Users/mutsu/.vim/bundle/YouCompleteMe/python/ycm/client/shutdown_request.py", line 39, in Start
    display_message = False )
  File "/Users/mutsu/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 127, in PostDataToHandler
    BaseRequest.PostDataToHandlerAsync( data, handler, timeout ),
  File "/Users/mutsu/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 137, in PostDataToHandlerAsync
    return BaseRequest._TalkToHandlerAsync( data, handler, 'POST', timeout )
  File "/Users/mutsu/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 152, in _TalkToHandlerAsync
    return BaseRequest.Session().post(
  File "/Users/mutsu/.vim/bundle/YouCompleteMe/python/ycm/client/base_request.py", line 196, in Session
    from requests_futures.sessions import FuturesSession
ImportError: cannot import name 'FuturesSession' from 'requests_futures.sessions' (/Users/mutsu/.vim/bundle/YouCompleteMe/third_party/requests-futures/requests_futures/sessions.py)

[bstaletic]

Can you do :py from requests_futures.sessions import FuturesSession or :py3 from requests_futures.sessions import FuturesSession from inside vim?

What about going into third_party/requirests-futures/ and executing python -c 'from requests_futures.sessions import FuturesSession'?

[zyqhi]

python -c 'from requests_futures.sessions import FuturesSession'

Vim will crash after executing py3 from requests_futures.sessions import FuturesSession with output:

And the follow is the output of executing python -c 'from requests_futures.sessions import FuturesSession'

➜  requests_futures git:(ef7d9e2) pwd
/Users/mutsu/.vim/bundle/YouCompleteMe/third_party/requests-futures/requests_futures
➜  requests_futures git:(ef7d9e2) python3 -c 'from requests_futures.sessions import FuturesSession'
➜  requests_futures git:(ef7d9e2)
➜  requests_futures git:(ef7d9e2) python2 -c 'from requests_futures.sessions import FuturesSession'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: No module named requests_futures.sessions

It's seems like the python environment problem.

[bstaletic]

Vim will crash after executing py3 from requests_futures.sessions import FuturesSession with output:

That's what I expected. Now to reproduce it outside of vim, perhaps.

And the follow is the output of executing python -c 'from requests_futures.sessions import FuturesSession'

Sounds like you didn't go to the right directory beforehand. Go into YouCompleteMe/third_party/requests-futures and try again.

[zyqhi]

Vim will crash after executing py3 from requests_futures.sessions import FuturesSession with output:

That's what I expected. Now to reproduce it outside of vim, perhaps.

And the follow is the output of executing python -c 'from requests_futures.sessions import FuturesSession'

Sounds like you didn't go to the right directory beforehand. Go into YouCompleteMe/third_party/requests-futures and try again.

➜  requests-futures git:(ef7d9e2) pwd
/Users/mutsu/.vim/bundle/YouCompleteMe/third_party/requests-futures
➜  requests-futures git:(ef7d9e2) python -c 'from requests_futures.sessions import FuturesSession'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "requests_futures/sessions.py", line 22, in <module>
    from concurrent.futures import ThreadPoolExecutor, ProcessPoolExecutor
ImportError: No module named concurrent.futures
➜  requests-futures git:(ef7d9e2)
➜  requests-futures git:(ef7d9e2) python3 -c 'from requests_futures.sessions import FuturesSession'
[1]    79349 abort      python3 -c 'from requests_futures.sessions import FuturesSession'
➜  requests-futures git:(ef7d9e2)

After executing python3 -c 'from requests_futures.sessions import FuturesSession', Python crashed.

[bstaletic]

So something is wrong with your python3. Either fix your python or install YCM with python2.

[puremourning]

Try removing the site packages you have in your homebrew python.

Closing as not YCM issue.

[zyqhi]

Try removing the site packages you have in your homebrew python.

Closing as not YCM issue.

Thanks, it helps.

[chinanoahli]

Thanks, it helps. After I remove all site packages, crash stoped.

[linrongbin16]

@chinanoahli

when running brew uninstall python3 and brew install python3, homebrew will/can not remove the folder /usr/local/lib/python3.7, so next time when you install python3 with brew install python3, folder /usr/local/lib/python3.7 will remain the same.

so the old /usr/local/lib/python3.x/site-package is possible to have conflicts with the new installed python3, which finally cause a crach.

[chinanoahli]

@chinanoahli

when running brew uninstall python3 and brew install python3, homebrew will/can not remove the folder /usr/local/lib/python3.7, so next time when you install python3 with brew install python3, folder /usr/local/lib/python3.7 will remain the same.

so the old /usr/local/lib/python3.x/site-package is possible to have conflicts with the new installed python3, which finally cause a crach.

I am using virtualenv for my project now, in system wide pip I just get pip wheel setuptools virtualenv installed. I think it will prevent this issue from now on.

[linrongbin16]

That's a good solution.

I used these steps, which works well for me:

1. brew uninstall python3 -- remove python3
2. sudo rm -rf /usr/local/lib/python3.7 -- remove old site-packages, which should been removed by homebrew, but not actually.
3. brew install python3 -- install new python3, this will also generate new /usr/local/lib/python3.7/site-packages

[dieterplex]

Similar symptom on archlinux: AttributeError: type object 'BaseRequest' has no attribute 'session'
The root cause seems to be related to leftover requests .pyc files at /usr/share/vim/vimfiles/third_party.
I guess old .pyc files take precedence over newly installed .py files.

Clearing all related .pyc files first may solve similar problems.