[Rcpp-devel] Possible regression in R-3.2.3 or Rcpp 0.12.3
qkou at umail.iu.edu
Fri Jan 29 23:55:43 CET 2016
Hi, Paul, can you try my fork of Rcpp? You can install it by the line below:
devtools::install_github("thirdwing/Rcpp", ref = "subsetter")
This fixed the segfault on my Ubuntu machine.
The difference can be found from .
In *subsetter*, if an IntegerVector passed in, we will try to reuse it.
This led to a segfault in this case, which I don't know why.
Dirk and Kevin, do you have any thoughts on it?
On Fri, Jan 29, 2016 at 3:00 PM, Qiang Kou <qkou at umail.iu.edu> wrote:
> Hi, Kevin, I was also trying to track this down yesterday.
> From the debugging info below, *indices_n* is not equal to length of
> *indices*, which I don't quite understand.
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007ffff2ed5c4e in Rcpp::SubsetProxy<13, Rcpp::PreserveStorage, 13,
> true, Rcpp::sugar::Minus_Vector_Primitive<13, true, Rcpp::Vector<13,
> Rcpp::PreserveStorage> > >::get_vec (this=this at entry=0x7fffffff79a0)
> 199 output[i] = lhs[ indices[i] ];
> (gdb) p i
> $1 = 33622
> (gdb) p indices[i]
> Cannot access memory at address 0x34c6e000
> (gdb) p indices_n
> $2 = 9594546
> On Fri, Jan 29, 2016 at 2:29 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
>> On 29 January 2016 at 11:27, Kevin Ushey wrote:
>> | When I add some debug printing to the associated subscripting line
>> | (
>> | I see:
>> | colNumbers.size(): 98,03,150
>> | charCols.size(): 95,94,546
>> | It looks to me like the package is erroneously attempting to subset
>> | vectors of different sizes, causing out-of-bounds reads.
>> Nice work.
>> | Unfortunately, Rcpp is not detecting or warning about this...
>> | Either way, I believe this is a bug in the openxlsx package, but Rcpp
>> | should be checking / reporting this.
>> With (Rcpp)Armadillo you do have an option of turning this on/off. With
>> alone not quite.
>> http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org
>> Rcpp-devel mailing list
>> Rcpp-devel at lists.r-forge.r-project.org
> Qiang Kou
> qkou at umail.iu.edu
> School of Informatics and Computing, Indiana University
qkou at umail.iu.edu
School of Informatics and Computing, Indiana University
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