[datatable-help] Random segfaults

[Matthew Dowle]

You're R < 2.14.0, right?  I'm really struggling in R < 2.14.0 to make
over-allocation work because R only started to initialize truelength to 0
in R 2.14.0+. Before that it's unitialized (random). Trouble is my
attempts in R < 2.14.0 to work around that work fine for me in linux 32bit
when I test in R 2.13.2, and I even test in 2.12.0 too. I test on 64bit
too but just 2.14.0.  CRAN is also showing errors on 2.13.2 (old-rel) for
both mac and windows.

So, this is a pre-2.14.0 (only) problem that I'll continue to try and fix.

Are you 64bit pre-2.14.0? Which OS?  If you are 64bit linux then it adds
weight to me installing pre-2.14.0 on my 64bit instance in an effort to
reproduce.


> This will be a crappy help request because I can't seem to reproduce
> it, but the past few days I've been getting a lot of segfaults.  The
> only common thing between every crash is that it happens when I do
>
> DT[, z := x]
>
> where z was not a column that existed in DT before, and x is either an
> existing column of DT or a separate variable, doesn't matter.  Beyond
> that I can't reproduce a set of steps that gets R to crash.  This is
> with the latest SVN version.
>
> Is there more information I can provide to help track this down?
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