Good to hear the text console issue has gone away.  Issues with text
consoles can sometimes be kernel issues; if it went away after upgrading
the kernel, then that would be a pretty strong clue.  We've not put in
any changes to -intel recently that would have made that start working,
and the only noteworthy xserver change was removing the maxclients
change (which caused issues for -nvidia), although I'm doubtful that
would have caused vt corruption.  So, my guess there would be that
either the issue is intermittent and will come back, or it was a kernel
issue that is now fixed.

> However, this backtrace will only be for the free(3) which triggers the abort.
> If my guess is right, then the corruption is happening sometime earlier, and
> may be very difficult to track down. Does the X server play nicely with 
> valgrind?

valgrind is definitely listed as an X testing tool
(http://freedesktop.org/wiki/Software/XTesting) although I've tried
running it myself and it just makes X flicker and turns my vt consoles
yellow.  It certainly flags a lot of issues, though.  If you can get X
to run under it enough to reproduce the issue, maybe it could give us
useful info.

-- 
*** glibc detected *** free(): invalid next size (fast)
https://bugs.launchpad.net/bugs/328035
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