Hi all! I compile an application using Eigen with clang address sanitizer, and run this application but hit a SEGV.
I see there was a bug "GCC address sanitizer breaks 16-byte alignment of glibc malloc" (https://eigen.tuxfamily.org/bz/show_bug.cgi?id=552). It seems this is a same issue with the gcc one. In https://gitlab.com/libeigen/eigen/-/commit/b6dc2613acbb4659988eb3237225bb0974d85d52 we use macro __SANITIZE_ADDRESS__ to detect if Eigen is compiled with address sanitizer, but clang do not recognize this macro, clang use __has_feature(address_sanitizer). To verify, I'm manually define EIGEN_MALLOC_ALREADY_ALIGNED to 0 and build with clang address sanitizer again. However, this time address sanitizer reports SEGV again. The SEGV is caused by Eigen::internal::pstore(double* to, double vector[4] const& from), when we call _mm256_store_pd(to, from), the address of to is not aligned to 32. Is there anyone hit a similar issue or is there anyone tried building and running an application using Eigen with clang address sanitizer instrumented ? Best, Xu Mingjie
