R help - Feb 2016 - .Internal(La_rs(x, FALSE)) crashes R after long (reproducible) script on windows only

hi, does anybody have a clue why .Internal(La_rs(x,FALSE)) is getting
corrupted (actual detonation occurs within La_solve_cmplx within Lapack.c)
on windows but not mac/unix?

i have provided two (long) scripts that reproduce the problem and a third
script modified to trigger the crash that unfortunately does not reproduce
the problem

http://stackoverflow.com/questions/35447971/internalla-rsx-false-crashes-r-after-long-reproducible-script-on-windows

thanks

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On 23/02/2016 7:49 AM, Anthony Damico wrote:
> hi, does anybody have a clue why .Internal(La_rs(x,FALSE)) is getting
> corrupted (actual detonation occurs within La_solve_cmplx within Lapack.c)
> on windows but not mac/unix?
>
> i have provided two (long) scripts that reproduce the problem and a third
> script modified to trigger the crash that unfortunately does not reproduce
> the problem
>
>
http://stackoverflow.com/questions/35447971/internalla-rsx-false-crashes-r-after-long-reproducible-script-on-windows
Just two comments:

  - Your post suggests you're calling .Internal() yourself, but that's 
not the case.  So your question should be about why eigen() crashes R.

  - If you need a long script to trigger the error, I'd assume there's 
something wrong in that script. Your script uses several contributed 
packages, so the problem could be there. Shorten it to a minimal 
reproducible example that doesn't use any contributed packages.  If you 
can't leave out the packages, try to reduce it to just one, and ask the 
maintainer of that package about it.

Duncan Murdoch

hi, thank you,

at the point that the corruption exists, the line
`.Internal(La_rs(x,FALSE))` actually breaks without needing `eigen`

i have provided a reproducible example but agree it might not be minimal --
i did try removing various sections, each time the bug unfortunately
vanished.  note the february 22nd edit: even interspersing the script with
the line that triggers the crash prevents the crash in the first place!

i think this occurs in C and not R, and would appreciate pointers about how
one might do that?  the only advice i've have is rebuilding R with a debug
build and gdb, but this seems like a huge lift --  are there any shortcuts
here for someone mostly unfamiliar with C code and even setup?  general
advice on this thread might also help me crack this case  :)

stackoverflow.com/questions/35455135/general-suggestions-on-debugging-internal-in-r

thanks for your time

On Tue, Feb 23, 2016 at 8:22 AM, Duncan Murdoch <murdoch.duncan at
gmail.com>
wrote:
> On 23/02/2016 7:49 AM, Anthony Damico wrote:
>
>> hi, does anybody have a clue why .Internal(La_rs(x,FALSE)) is getting
>> corrupted (actual detonation occurs within La_solve_cmplx within
Lapack.c)
>> on windows but not mac/unix?
>>
>> i have provided two (long) scripts that reproduce the problem and a
third
>> script modified to trigger the crash that unfortunately does not
reproduce
>> the problem
>>
>>
>>
http://stackoverflow.com/questions/35447971/internalla-rsx-false-crashes-r-after-long-reproducible-script-on-windows
>>
>
> Just two comments:
>
>  - Your post suggests you're calling .Internal() yourself, but
that's not
> the case.  So your question should be about why eigen() crashes R.
>
>  - If you need a long script to trigger the error, I'd assume
there's
> something wrong in that script. Your script uses several contributed
> packages, so the problem could be there. Shorten it to a minimal
> reproducible example that doesn't use any contributed packages.  If you
> can't leave out the packages, try to reduce it to just one, and ask the
> maintainer of that package about it.
>
> Duncan Murdoch
>
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