https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63316
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- MALLOC_ABI_ALIGNMENT is BITS_PER_WORD (too small for Linux actually, glibc guarantees 2 * BITS_PER_WORD). So, this IMNSHO is a libsanitizer bug, in that it doesn't provide the Linux ABI guaranteed alignments. On 32-bit Linux targets, malloc even for 1-7 bytes (and 0 if it doesn't return NULL for that) allocations should return 8 byte aligned memory, and for 64-bit Linux targets, malloc even for 1-15 bytes long allocations should return 16 byte aligned memory. Kostya, can you please fix sanitizer_common?
