Sebastien, I tried to force gdm-session-worker to produce core dump, but had no 
luck.
It's /proc/pid/limits has soft core limit set to 0:
Limit                     Soft Limit           Hard Limit           Units   
...
Max core file size        0                    unlimited            bytes
...

I think, this prevents core dump (and apport to catch it). Limits from
/etc/security/limits.* applied after gdm start, init script with "ulimit
-c unlimited" didn't change the situation -- looks like, that limit is
overridden somewhere.

If you can tell, how to get core dump for gdm -- I will post all details.
This backtrace was collected with gdb attached to running process.

-- 
gdm-session-worker crashes on usb storage mount/unmount/connect/disconnect
https://bugs.launchpad.net/bugs/553190
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