On 29 January 2016 at 17:55, Qiang Kou wrote:
| 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.
Yay. Nice work!
| The difference can be found from [1].
Nice and concise.
| 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?
Not really, but happy to give this the full reverse-dependency check
treatment so that we can merge it.
Dirk
| Best wishes,
|
| KK
|
| [1] https://github.com/thirdwing/Rcpp/commit/
| 216c5220bcb84778a656b3496d0f1803b973ef61
|
|
| On Fri, Jan 29, 2016 at 3:00 PM, Qiang Kou <q...@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@entry=0x7fffffff79a0)
|
| at /usr/local/lib/R/site-library/Rcpp/include/Rcpp/vector/
| Subsetter.h:200
|
| 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 <e...@debian.org>
wrote:
|
|
| On 29 January 2016 at 11:27, Kevin Ushey wrote:
| | When I add some debug printing to the associated subscripting line
| | (https://github.com/awalker89/openxlsx/blob/
| b92bb3acdd6ea759be928c298c6faeef2f26fa3e/src/cppFunctions.cpp#L2608),
| | 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
| Rcpp
| alone not quite.
|
| Dirk
|
| --
| http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org
| _______________________________________________
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|
https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
|
|
|
|
| --
| Qiang Kou
| q...@umail.iu.edu
| School of Informatics and Computing, Indiana University
|
|
|
|
|
| --
| Qiang Kou
| q...@umail.iu.edu
| School of Informatics and Computing, Indiana University
|
--
http://dirk.eddelbuettel.com | @eddelbuettel | e...@debian.org
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