[datatable-help] Random segfaults

[Matthew Dowle]

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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