[datatable-help] Random segfaults

[Matthew Dowle]

Maybe, worth a try. Are you loading any data.table objects from disk?

> 64 bit 2.12.1 linux.
>
> Is there an option I can set in my session in order to work around the
> truelength issue? I don't care if I lose some of the over-allocation
> niceties if it stops things from crashing. Looking at the truelength
> help, would just doing:
>
> options(datatable.alloc=quote(1000))
>
> stop this? I never have more than about 50 columns at a time.
>
> On 14 December 2011 11:43, Matthew Dowle <mdowle at mdowle.plus.com> wrote:
>>
>> 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?
>>> _______________________________________________
>>> datatable-help mailing list
>>> datatable-help at lists.r-forge.r-project.org
>>> https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
>>>
>>
>>
>