[datatable-help] Random segfaults

[Chris Neff]

I definitely do that somewhere in my code. I'll patch tomorrow and try.

On 19 December 2011 19:03, 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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>
>