Hi Gabor, Calling back to an R function from the ALTREP function is not safe. There has been a heated discussion on why you should not do it and that the main reason that we do not have any R level ALTREP API. If you are interested in it you can find it from this issue: https://github.com/Bioconductor/Contributions/issues/1222
Best, Jiefei On Fri, May 28, 2021 at 4:54 PM Gábor Csárdi <csardi.ga...@gmail.com> wrote: > > I have found some weird SEXP corruption behavior with ALTREP, which > could be a bug. (Or I could be doing something wrong.) > > I have an integer ALTREP vector that calls back to R from the Elt > method. When this vector is indexed in a lapply(), its first element > gets corrupted. Sometimes it's just a type change to logical, but > sometimes the corruption causes a crash. > > I saw this on macOS from R 3.5.3 to 4.2.0. I created a small package > that demonstrates this: https://github.com/gaborcsardi/redfish > > The R callback in this package calls `loadNamespace("Matrix")`, but > the same crash happens for other packages as well, and sometimes it > also happens if I don't load any packages at all. (But that example > was much more complicated, so I went with the package loading.) > > It is somewhat random, and sometimes turning off the JIT avoids the > crash, but not always. > > Hopefully I am just doing something wrong in the ALTREP code (see > https://github.com/gaborcsardi/redfish/blob/main/src/test.c), and it > is not actually a bug. > > Thanks, > Gabor > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
