Are you able to share a reproducible example? The CRAN check report from https://www.stats.ox.ac.uk/pub/bdr/memtests/clang-ASAN/MatchIt/00check.log points at MatchIt/src/nnm.cpp:182:24. You could probably distill the code used in that location into a smaller reproducible example.
Best, Kevin On Sun, Nov 15, 2020 at 3:31 PM Noah Greifer <noah.grei...@gmail.com> wrote: > Hello, > > I use Rcpp in the package I maintain, MatchIt. I recently upload it to > CRAN with no problems, but then received a message saying there were > "additional issues" I needed to address, which were titled clang-ASAN and > gcc-ASAN. Looking at the log, it seems that the error was triggered when I > used an R function (mahalanobis()) inside the Rcpp code. I realized that I > had not properly initialized the function in my Rcpp script. Although the > package functions ran correctly, perhaps something about the way the memory > was allocated caused this issue. I think I fixed the issue, but I want to > check it without uploading it to CRAN again. This issue was not picked up > by R cmd check or by the check in winbuilder, so I'm not sure how to check > if I have solved the issue. CRAN even accepted my package before letting me > know about this issue. > > In searching for solutions to the problem of being able to check whether > the issue in my package remains, I came across this > <http://dirk.eddelbuettel.com/code/sanitizers.html> article posted by > Dirk ("sanitizers: Testing R packages for ASAN and UBSAN errors"). It seems > like this article is about using sanitizers, which helps you figure out if > your build of R is able to detect the memory allocation errors I was > facing, but doesn't give clear instructions on how to set up R to do this. > As someone for whom using Rcpp was my first use of programming outside R, > the instructions given in the article and in section 4.3 of Writing R > Extensions are completely foreign to me and seem to require a deep > knowledge of C++. > > I'm wondering if someone can provide me with a clear procedure on how to > check if the memory allocation problem still remains in my package. Thank > you. > > Noah Greifer > > PS What seems to be the relevant text in the error message is pasted below: > > ==1503820==ERROR: AddressSanitizer: stack-use-after-scope on address > 0x7ffc220ca7a0 at pc 0x7fc2fb4668ad bp 0x7ffc220ca5b0 sp 0x7ffc220ca5a8 > READ of size 8 at 0x7ffc220ca7a0 thread T0 > #0 0x7fc2fb4668ac in Rcpp::PreserveStorage<Rcpp::Vector<14, > Rcpp::PreserveStorage> >::get__() const > /data/gannet/ripley/R/test-clang/Rcpp/include/Rcpp/storage/PreserveStorage.h:26:20 > #1 0x7fc2fb4668ac in Rcpp::Vector<14, Rcpp::PreserveStorage>::size() > const > /data/gannet/ripley/R/test-clang/Rcpp/include/Rcpp/vector/Vector.h:277:39 > #2 0x7fc2fb4668ac in Rcpp::sugar::Vectorized<&(sqrt), true, > Rcpp::Vector<14, Rcpp::PreserveStorage> >::size() const > /data/gannet/ripley/R/test-clang/Rcpp/include/Rcpp/sugar/block/Vectorized_Math.h:40:50 > > ... > > Address 0x7ffc220ca7a0 is located in stack of thread T0 at offset 448 in frame > #0 0x7fc2fb46644f in void Rcpp::Vector<14, > Rcpp::PreserveStorage>::assign_sugar_expression<Rcpp::sugar::Vectorized<&(sqrt), > true, Rcpp::Vector<14, Rcpp::PreserveStorage> > > >(Rcpp::sugar::Vectorized<&(sqrt), true, Rcpp::Vector<14, > Rcpp::PreserveStorage> > const&) > /data/gannet/ripley/R/test-clang/Rcpp/include/Rcpp/vector/Vector.h:1038 > > This frame has 1 object(s): > [32, 48) 'ref.tmp.i.i.i.i.i' <== Memory access at offset 448 overflows > this variable > HINT: this may be a false positive if your program uses some custom stack > unwind mechanism, swapcontext or vfork > (longjmp and C++ exceptions *are* supported) > SUMMARY: AddressSanitizer: stack-use-after-scope > /data/gannet/ripley/R/test-clang/Rcpp/include/Rcpp/storage/PreserveStorage.h:26:20 > in Rcpp::PreserveStorage<Rcpp::Vector<14, Rcpp::PreserveStorage> >::get__() > const > Shadow bytes around the buggy address: > 0x1000044114a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > _______________________________________________ > Rcpp-devel mailing list > Rcpp-devel@lists.r-forge.r-project.org > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
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