[datatable-help] Random segfaults

[Timothée Carayol]

Hi -- yes, that could well be the case. My frequency of bugs was nowhere
near that of Chris Neff though, but maybe the cause was the same. My
problems were only in one specific one-off application, for which I rewrote
the code in a data.frame-esque way, and was a rather heavy job in the first
place -- so it would be rather inconvenient to test this fix. I haven't had
any data.table problem in a weeks.

Cheers
On Dec 20, 2011 12:09 AM, "Matthew Dowle" <mdowle at mdowle.plus.com> wrote:

> Chris,
>
> Are you returning any character or list() columns in j when grouping? If
> so, Jim Holtman provided a reproducible example and a fix has just been
> committed. Same errors / seg faults, and, for R >= 2.14.0, not just R <
> 2.14.0. Could this also be the same problem Timothée Carayol mentioned?
> Fingers crossed ...
>
> Matthew
>
>
> On Sat, 2011-12-17 at 00:27 +0000, Matthew Dowle wrote:
> > It'd be good to get to the bottom of it in case it's not a pre-2.14.0
> > problem.  Try this :
> >
> > apt-get install valgrind  (if not already installed)
> > R -d valgrind
> > require(data.table)
> > test.data.table()
> >
> > When I do this it runs very slowly but eventually completes ok with just
> > test 120 failing. Test 120 is a timing test, which takes longer because
> > of valgrind mode, so that's ok. Ignore the valgrind messages for R
> > itself that happen before R's banner comes up.
> >
> > If you get the same, then proceed to run your tests that crash it.
> > Hopefully you'll get some messages at the point the corruption occurs.
> >
> >
> > On Fri, 2011-12-16 at 12:37 -0500, Chris Neff wrote:
> > > >
> > > > Only other thought ... your special internal build of R ... does it
> > > > increase R_len_t on 64bit to allow longer vectors than 2^31, by any
> > > > chance?  I've used R_len_t quite a bit in data.table to future proof
> for
> > > > when that happens, but if you've done it already in your build then
> that
> > > > would help to know since it's never been tested afaik when R_len_t
> != int
> > > > on 64bit.  I'm also assuming R_len_t is signed. If your R has
> R_len_t as
> > > > unsigned would need to know.
> > >
> > > Answer to this is no, we haven't touched that.
> > >
> > > I'm happy to keep helping, but if you'd rather not worry about that
> > > stuff, we will be upgrading to 2.14 in the next few months apparently,
> > > and I can live with 1.7.1 until then.
> >
> >
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> >
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