The error in your logs looks a lot like
http://bugzilla.kernel.org/show_bug.cgi?id=12192
However this doesn't really crash the kernel ?
Did you reproduce it ever since ? Does it reappear if you reinstall samba stuff
or use CIFS mounts ?
** Changed in: samba (Ubuntu)
Status: New => Incomplete
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CIFS kernel bug crashes system
https://bugs.launchpad.net/bugs/344281
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