Multiple applications crash with segfault in libwebkitgtk-3.0.so.0.22.14

Some applications crash on my Ubuntu 14.04.2 (all updates installed) with referring to the same source: libwebkitgtk-3.0.so.0.22.14

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Evolution:

nsk@sesta09:~$ evolution

(evolution:16111): camel-WARNING **: Failed to initialize NSS SQL database in sql:/etc/pki/nssdb: NSS error -8126
Speicherzugriffsfehler (Speicherabzug geschrieben)

nsk@sesta09:~$ tail -1 /var/log/syslog
Apr 3 16:11:54 sesta09 kernel: [ 4646.673708] evolution[16111]: segfault at 3c78f55f ip 00007f61a5a3a9de sp 00007fff3c78f530 error 6 in libwebkitgtk-3.0.so.0.22.14[7f61a4ec3000+1c91000]
nsk@sesta09:~$

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Unity Control Center, when accessing the "Information" element:

nsk@sesta09:~$ unity-control-center
Speicherzugriffsfehler (Speicherabzug geschrieben)
nsk@sesta09:~$ tail -1 /var/log/syslog
Apr 3 16:12:57 sesta09 kernel: [ 4709.794574] unity-control-c[16747]: segfault at 4ca0de9f ip 00007fa18367c9de sp 00007fff4ca05e80 error 6 in libwebkitgtk-3.0.so.0.22.14[7fa182b05000+1c91000]
nsk@sesta09:~$

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Software Center:

nsk@sesta09:~$ software-center
2015-04-03 16:16:38,647 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2015-04-03 16:16:39,625 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2015-04-03 16:16:39,627 - softwarecenter.plugin - INFO - activating plugin '<module 'webapps_activation' from '/usr/share/software-center/softwarecenter/plugins/webapps_activation.pyc'>'
2015-04-03 16:16:39,679 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open()
2015-04-03 16:16:40,517 - softwarecenter.backend.reviews - WARNING - error creating bsddb: '(22, 'Das Argument ist ung\xc3\xbcltig -- BDB0054 illegal flag combination specified to DB_ENV->open')' (corrupted?)
2015-04-03 16:16:40,518 - softwarecenter.backend.reviews - ERROR - trying to repair DB failed
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/backend/reviews/__init__.py", line 358, in _save_review_stats_cache_blocking
    self._dump_bsddbm_for_unity(outfile, outdir)
  File "/usr/share/software-center/softwarecenter/backend/reviews/__init__.py", line 377, in _dump_bsddbm_for_unity
    0600)
DBInvalidArgError: (22, 'Das Argument ist ung\xc3\xbcltig -- BDB0054 illegal flag combination specified to DB_ENV->open')
/usr/lib/python2.7/dist-packages/gi/overrides/GLib.py:535: Warning: Source ID 74 was not found when attempting to remove it
  return super(MainContext, self).iteration(may_block)
Speicherzugriffsfehler (Speicherabzug geschrieben)
nsk@sesta09:~$ tail -1 /var/log/syslog
Apr 3 16:16:41 sesta09 kernel: [ 4933.484896] software-center[18773]: segfault at 1544dd3f ip 00007fd466b3c9de sp 00007fff15445d10 error 6 in libwebkitgtk-3.0.so.0.22.14[7fd465fc5000+1c91000]
nsk@sesta09:~$

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I am assuming this started with update of libwebkitgtk-3.0-0 from version 2.4.0-1ubuntu2 to 2.4.8-1ubuntu1~ubuntu14.04.1, but I am unable to downgrade via synaptic or apt because the dependencies wants me to uninstall half of the system then...

This is my current kernel:
nsk@sesta09:~$ uname -a
Linux sesta09 3.13.0-48-generic #80-Ubuntu SMP Thu Mar 12 11:16:15 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
nsk@sesta09:~$

But the behaviour did not changed with the last kernel upgrade.

I am using Gnome Flashback desktop environment with version 3.8.0-1ubuntu12.2

Additionally using compiz

nsk@sesta09:~$ compiz --version
Compiz 0.9.11.3
nsk@sesta09:~$

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Here I created a bug report for the webkit people with more in-depth debug traces: https://bugs.webkit.org/show_bug.cgi?id=144109