WebKit apps crash after a while in Trusty

[Adam Dingle]

I run Trusty (the upcoming 14.04 release) every day.  In the past week 
or so I've started seeing the following behavior.  After I've been 
logged in for some amount of time (perhaps an hour, though it may 
vary), all WebKit-based applications (such as Epiphany, Chromium and 
Spotify) crash and won't run any more: they report a bus error on 
startup.  (The process list shows that WebKitWebProcess is not 
running.)  When I then log out, the system falls back to low-graphics 
mode and so I must reboot to be able to log in again.  After a reboot, 
everything is apparently fine, but after an hour or so these apps crash 
again and I must reboot once more.

Normally I would file a Launchpad ticket about this, but it's not 
obvious which system component is to blame here.  Does anyone know of 
recent changes in Trusty that might be causing a problem like this?

adam
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