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
