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Bug 484774 - dev-util/meld-1.7.5 - meld: ImportError: This platform lacks a functioning sem_open implementation, therefore, the required synchronization primitives needed will not function, see issue 3770.
Summary: dev-util/meld-1.7.5 - meld: ImportError: This platform lacks a functioning se...
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] GNOME (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Python Gentoo Team
Depends on:
Reported: 2013-09-13 14:54 UTC by Juergen Rose
Modified: 2014-01-01 16:48 UTC (History)
2 users (show)

See Also:
Package list:
Runtime testing required: ---


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Description Juergen Rose 2013-09-13 14:54:00 UTC
'meld file1 file2' fails with:

rose@lynx:/home/rose(30)$ meld /net/leopard.ibmt.intern/home_leopard/rose/Txt/projects/IVD_soeren/Cameras/Artemis/Examples_from_Developers_Guide_without_QT_for_Linjing/Makefile  Txt/projects/IVD_soeren/Cameras/Artemis/Examples_from_Developers_Guide_without_QT_for_Linjing/Makefile 
/usr/lib64/python2.7/site-packages/gobject/ Warning: attempting to add an interface (GtkEditable) to class (HistoryFileEntry) after class_init
  type_register(cls, namespace.get('__gtype_name__'))
Traceback (most recent call last):
  File "/usr/lib64/python2.7/multiprocessing/", line 59, in <module>
    " function, see issue 3770.")
ImportError: This platform lacks a functioning sem_open implementation, therefore, the required synchronization primitives needed will not function, see issue 3770.

issue 3770 seems to be connected with .

It happens only on one system. Is this connected with a kernel option or is it a python problem? I do not understand.

rose@lynx:/home/rose(32)$ eselect python list
Available Python interpreters:
  [1]   python2.7 *
  [2]   python3.2
  [3]   python3.3

rose@lynx:/home/rose(34)$ emerge --info meld
Portage 2.2.4 (default/linux/amd64/13.0/desktop, gcc-4.7.3, glibc-2.17, 3.11.0-gentoo x86_64)
                        System Settings
System uname: Linux-3.11.0-gentoo-x86_64-Intel-R-_Core-TM-2_Duo_CPU_T8300_@_2.40GHz-with-gentoo-2.2
KiB Mem:     3987304 total,    246824 free
KiB Swap:   12582908 total,  12564748 free
Timestamp of tree: Fri, 13 Sep 2013 11:00:01 +0000
ld GNU ld (GNU Binutils) 2.23.2
distcc[21466] (dcc_set_trace_from_env) ERROR: failed to open logfile /var/log/distcc.log: Permission denied [disabled]
app-shells/bash:          4.2_p45
dev-java/java-config:     2.2.0
dev-lang/python:          2.7.5-r2, 3.2.5-r2, 3.3.2-r2
dev-util/pkgconfig:       0.28
sys-apps/baselayout:      2.2
sys-apps/openrc:          0.12
sys-apps/sandbox:         2.6-r1
sys-devel/autoconf:       2.13, 2.69
sys-devel/automake:       1.9.6-r3, 1.10.3, 1.11.6, 1.12.6, 1.13.4, 1.14
sys-devel/binutils:       2.23.2
sys-devel/gcc:            4.6.4, 4.7.3
sys-devel/gcc-config:     1.8
sys-devel/libtool:        2.4.2
sys-devel/make:           3.82-r4
sys-kernel/linux-headers: 3.11 (virtual/os-headers)
sys-libs/glibc:           2.17
Repositories: gentoo x11 sage-on-gentoo science sunrise lordvan local g-cpan g-octave
Installed sets: @system
ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="* -@EULA PUEL Intel-SDP dlj-1.1 skype-eula skype- googleearth AdobeFlash-11.x cadsoft Oracle-BCLA-JavaSE MakeMKV-EULA NVIDA-CUDA"
CFLAGS="-march=native -O2 -pipe"
CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /var/lib/hsqldb"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.3/ext-active/ /etc/php/apache2-php5.5/ext-active/ /etc/php/cgi-php5.3/ext-active/ /etc/php/cgi-php5.5/ext-active/ /etc/php/cli-php5.3/ext-active/ /etc/php/cli-php5.5/ext-active/ /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c"
CXXFLAGS="-march=native -O2 -pipe"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-march=native -O2 -pipe"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages"
PORTDIR_OVERLAY="/var/lib/layman/x11 /var/lib/layman/sage-on-gentoo /var/lib/layman/science /var/lib/layman/sunrise /var/lib/layman/lordvan /usr/local/portage /var/lib/cpan /var/lib/g-octave"
USE="64bit R X Xaw3d a52 aac acl acpi admin afs alsa amd64 ao apache2 apng applet archive armadillo arpack asf aspell atlas audacious audiofile automap automount bash-completion berkdb blas blast bluetooth bluray boost branding bzip2 cairo cdda cddb cdf cdio cdparanoia cdr cg cgi chm cli cmake consolekit cracklib crypt css cuda cups curl cxx daap db dbi dbm dbus declarative designer devhelp device-mapper dga dia dirac djvu doc dot dri ds2490 ds9097 ds9097u dts dv dvb dvd dvdr dvi dynamicplugin eds egl elf emacs emboss emf encode epiphany evo examples exif expat extensions extra extras faac faad fam ffmpeg fftw firefox fits flac fltk fontconfig foomaticdb fortran fortran95 fpm fpx fuse g3dvl garmin gcj gd gdal gdbm gdu gedit geoip geolocation geos gfortran gif gimp git glade glib glpk gml gmp gnome gnome-keyring gnome-print gnuplot gnutls gold gphoto2 gpm grammar graphics graphtft graphviz grass gsl gsm gstreamer gtk gtk3 gudev guile hddtemp hdf hdf5 hdri html http httpd hvm hwdb iconv icq icu id3 id3tag ide imagemagick imap inotify introspection ipod ipv6 irda ithreads jabber jadetex java java6 jbig john jpeg jpeg2k kate kdepim kdrive kerberos keymap kpathsea kvm ladspa lame lapack laptop latex lcms ldap lensfun libffi libkms libnotify libsamplerate lirc live lua lzma lzo mad mail maildir mapnik math matroska media-library mercurial mikmod mkl mmx mmxext mng mod modules mono motif mozilla mp3 mp4 mpeg mpi mplayer mtp mudflap multilib multimedia musepack musicbrainz mysql mysqli nautilus ncurses neXt netcdf netpbm network networking nfs nls nntp nptl nsplugin ntfs ntp numpy obex objc ocaml ocr octave odbc ofa ogdi ogg openexr opengl openmp openvg pam pango pcre pda pdf perl plasma plotutils plugins png podcast policykit portaudio posix postgres postscript ppds preview-latex proj projectm projectx pstricks pulseaudio python python-bindings q16 q32 qemu qhull qt3support qt4 quicktime raw readline real reiserfs reports rhythmbox rle romio rpc rrdcgi rrdtool sage samba sasl schroedinger science sdk sdl secure-delete semantic-desktop server session shout sip slang slp smart smbclient smp sms sndfile snmp soap sockets sound soup sox speex spell sql sqlite sse sse2 sse4 ssl ssse3 startup-notification stlport subtitles subversion sudo suexec svg svm swig systemd szip t1lib tcl tcpd tex tex4ht texmacs tgif theora thesaurus thinkpad threads thunderbird tidy tiff tk tools truetype udev udisks unicode upower usb userlocales utempter v4l vaapi vala valgrind vdpau video virt-network virtualbox visio vorbis vpx wav webdav webdav-serf webkit wifi wmf wxwidgets x264 xa xattr xcb xemacs xetex xext xft xine xml xmlreader xmlrpc xpm xv xvid xvmc yaml youtube zlib zvbi" ABI_X86="64" ALSA_CARDS="intel8x0" APACHE2_MODULES="actions alias auth_basic auth_digest authn_anon authn_dbd authn_core authn_dbm authn_default authn_file authz_core authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgid dav dav_fs dav_lock dbd deflate dir disk_cache env expires ext_filter file_cache filter headers ident imagemap include info lbmethod_byrequests log_config logio mem_cache mime mime_magic negotiation proxy proxy_ajp proxy_balancer proxy_connect proxy_http rewrite setenvif slotmem_shm so socache_shmcb speling status unique_id unixd userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="canon fuji ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CURL_SSL="nss" DRACUT_MODULES="caps lvm syslog" DVB_CARDS="usb-wt220u" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ubx" INPUT_DEVICES="keyboard mouse evdev synaptics void" KERNEL="linux" LCD_DEVICES="cfontz hd44780 mtxorb ncurses X lcd2usb lcdlinux png usblcd" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" LINGUAS="de fr ru" NETBEANS_MODULES="apisupport cnd dlight enterprise ergonomics groovy gsf harness ide identity j2ee java mobility nb php profiler ruby websvccommon xml" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-3" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_2" QEMU_SOFTMMU_TARGETS="arm i386 x86_64" QEMU_USER_TARGETS="arm i386 x86_64" RUBY_TARGETS="ruby19 ruby18" USERLAND="GNU" VIDEO_CARDS="nouveau displaylink" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"

                        Package Settings

dev-util/meld-1.7.5 was built with the following:
USE="gnome highlight" PYTHON_SINGLE_TARGET="python2_7 -python2_6" PYTHON_TARGETS="python2_7 -python2_6"
Comment 1 Alexandre Rostovtsev (RETIRED) gentoo-dev 2013-09-13 16:33:33 UTC
Sounds like an issue in python itself, or perhaps in glibc.
Comment 2 Mike Gilbert gentoo-dev 2013-09-13 19:06:14 UTC
Is /dev/shm mounted as tmpfs? glibc uses that for POSIX shared memory and semaphores.
Comment 3 Mike Gilbert gentoo-dev 2013-09-13 19:14:22 UTC
Also, you might want to try rebuilding dev-lang/python:2.7; it might be that sem_open was mis-detected by configure when last you built it.
Comment 4 Gilles Dartiguelongue gentoo-dev 2013-09-13 21:02:07 UTC
afaik, this is a bootstrap issue. You most likely installed your system from an environment which didn't allow python to compile with detecting needed libraries/headers/whatever to enable proper threading support.

Just rebuild python and you should be fine.
Comment 5 Juergen Rose 2013-09-16 14:59:37 UTC
(In reply to Gilles Dartiguelongue from comment #4)
> afaik, this is a bootstrap issue. You most likely installed your system from
> an environment which didn't allow python to compile with detecting needed
> libraries/headers/whatever to enable proper threading support.
> Just rebuild python and you should be fine.

Probably I was building python last time on a systems without systemd and udev, therefore(?) the shared memory was not recognized
After rebuilding python-2.7.5-r2, python-3.2.5-r2 and python-3.3.2-r2 the issue with meld disappeared.
Comment 6 Gilles Dartiguelongue gentoo-dev 2013-09-16 21:33:09 UTC
I would bet on the old libc for some reason. I had the same problem bootstrapping a gentoo system from a debian squeeze... :)
Comment 7 Jeroen Roovers (RETIRED) gentoo-dev 2013-12-30 01:00:57 UTC
*** Bug 496332 has been marked as a duplicate of this bug. ***
Comment 8 Joseph 2013-12-30 03:35:43 UTC
(In reply to Mike Gilbert from comment #3)
> Also, you might want to try rebuilding dev-lang/python:2.7; it might be that
> sem_open was mis-detected by configure when last you built it.

I rebuild both python-2.7.5-r3 and 3.3.2-r2 but it doesn't help in my case I still get the same error:

meld phone_book.txt 
Traceback (most recent call last):
  File "/usr/bin/meld", line 173, in <module>
  File "/usr/bin/meld", line 165, in main
    new_window = app.parse_args(sys.argv[1:])
  File "/usr/lib64/meld/meld/", line 169, in parse_args
    tab = open_paths(args, options.auto_compare, options.auto_merge)
  File "/usr/lib64/meld/meld/", line 791, in open_paths
  File "/usr/lib64/meld/meld/", line 781, in _single_file_open
  File "/usr/lib64/meld/meld/", line 395, in set_location
    self.choose_vc(vc.get_vcs(os.path.abspath(location or ".")))
  File "/usr/lib64/meld/meld/vc/", line 86, in get_vcs
    max_depth = max(len(vc.root) for vc in vcs if vc.VC_ROOT_WALK)
ValueError: max() arg is an empty sequence
Comment 9 Mike Gilbert gentoo-dev 2013-12-30 03:40:37 UTC
(In reply to Joseph from comment #8)

That's a completely different problem.