Bug#873641: gnome-shell: Segfault when opening various application with 'Shellshape'

[Grégoire Henry]

Package: gnome-shell
Version: 3.22.3-3
Severity: important
Tags: newcomer

Dear Maintainer,

  when launching different applications---such as nautilus, evince, or
reportbug---or when opening the dialog 'open file' in others application---such
as Firefox---and if the 'Shellshape' extension is actived in a mode different
of 'floating windows', the session suddenly closes. I found the following
segfault record in `dmesg`:

```
[   31.465888] gnome-shell[649]: segfault at 140 ip 00007f867f8537db sp
00007ffdf9178ff0 error 4 in libmutter.so.0.0.0[7f867f784000+12c000]
```

I did not manage to get a stack trace, my whole computer freezes as soon as I
attach gdb to `gnome-shell`.

The segfault happens at any tentative. But there is a "workaround": if I take
care of setting 'Shellshape' into the mode "floating window" when I launch an
application for the first time, then I am safe. Any subsequent launch of _any_
application
will succeed, indepently of the current mode of Shellshape.

Regards,
Grégoire



-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (900, 'testing'), (800, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.12.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gnome-shell depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.26.0-2+b1
ii  evolution-data-server                        3.22.7-1
ii  gir1.2-accountsservice-1.0                   0.6.43-1
ii  gir1.2-atspi-2.0                             2.24.1-1
ii  gir1.2-caribou-1.0                           0.4.21-1+b1
ii  gir1.2-freedesktop                           1.50.0-2
ii  gir1.2-gcr-3                                 3.20.0-5.1
ii  gir1.2-gdesktopenums-3.0                     3.24.0-2
ii  gir1.2-gdm-1.0                               3.24.2-3
ii  gir1.2-glib-2.0                              1.50.0-2
ii  gir1.2-gnomebluetooth-1.0                    3.20.1-1
ii  gir1.2-gnomedesktop-3.0                      3.22.2-1
ii  gir1.2-gtk-3.0                               3.22.18-1
ii  gir1.2-gweather-3.0                          3.20.4-1
ii  gir1.2-ibus-1.0                              1.5.14-3
ii  gir1.2-mutter-3.0                            3.22.4-2
ii  gir1.2-networkmanager-1.0                    1.8.2-1
ii  gir1.2-nmgtk-1.0                             1.8.2-1
ii  gir1.2-pango-1.0                             1.40.6-1
ii  gir1.2-polkit-1.0                            0.105-18
ii  gir1.2-soup-2.4                              2.56.1-1
ii  gir1.2-telepathyglib-0.12                    0.24.1-1.1
ii  gir1.2-telepathylogger-0.2                   0.8.2-2
ii  gir1.2-upowerglib-1.0                        0.99.5-3
ii  gjs                                          1.46.0-1+b2
ii  gnome-backgrounds                            3.22.1-1
ii  gnome-settings-daemon                        3.24.3-1
ii  gnome-shell-common                           3.22.3-3
ii  gsettings-desktop-schemas                    3.24.0-2
ii  libatk-bridge2.0-0                           2.24.1-1
ii  libatk1.0-0                                  2.24.0-1
ii  libc6                                        2.24-14
ii  libcairo2                                    1.14.10-1
ii  libcanberra-gtk3-0                           0.30-3
ii  libcanberra0                                 0.30-3
ii  libcroco3                                    0.6.12-1
ii  libdbus-glib-1-2                             0.108-2
ii  libecal-1.2-19                               3.22.7-1
ii  libedataserver-1.2-22                        3.22.7-1
ii  libgcr-base-3-1                              3.20.0-5.1
ii  libgdk-pixbuf2.0-0                           2.36.5-2
ii  libgirepository-1.0-1                        1.50.0-2
ii  libgjs0e [libgjs0-libmozjs-24-0]             1.46.0-1+b2
ii  libglib2.0-0                                 2.53.4-3
ii  libglib2.0-bin                               2.53.4-3
ii  libgstreamer1.0-0                            1.12.2-1
ii  libgtk-3-0                                   3.22.18-1
ii  libical2                                     2.0.0-0.5+b1
ii  libicu57                                     57.1-6
ii  libjson-glib-1.0-0                           1.2.8-1
ii  libmozjs-24-0                                24.2.0-5.1+b2
ii  libmutter0i                                  3.22.4-2
ii  libnm-glib4                                  1.8.2-1
ii  libnm-util2                                  1.8.2-1
ii  libpango-1.0-0                               1.40.6-1
ii  libpangocairo-1.0-0                          1.40.6-1
ii  libpolkit-agent-1-0                          0.105-18
ii  libpolkit-gobject-1-0                        0.105-18
ii  libpulse-mainloop-glib0                      10.0-2
ii  libpulse0                                    10.0-2
ii  libsecret-1-0                                0.18.5-3.1
ii  libstartup-notification0                     0.12-4+b2
ii  libsystemd0                                  234-2.3
ii  libtelepathy-glib0                           0.24.1-1.1
ii  libwayland-client0                           1.14.0-1
ii  libx11-6                                     2:1.6.4-3
ii  libxfixes3                                   1:5.0.3-1
ii  mutter                                       3.22.4-2
ii  python3                                      3.5.3-3

Versions of packages gnome-shell recommends:
ii  gdm3                        3.24.2-3
ii  gkbd-capplet                3.22.0.1-1+b1
ii  gnome-contacts              3.22.1-1+b2
ii  gnome-control-center        1:3.22.2-3
ii  gnome-themes-standard-data  3.22.3-1
ii  gnome-user-guide            3.22.0-1
ii  iio-sensor-proxy            2.2-1
ii  unzip                       6.0-21

gnome-shell suggests no packages.

-- no debconf information