/* We are using the bottom of the stack to save some information, like the
* valgrind_stack_id. Define smx_context_usable_stack_size to give the remaining
- * size for the stack. Round its value to a multiple of 16 (for stack alignment). */
+ * size for the stack. Round its value to a multiple of 16 (asan wants the stacks to be aligned this way). */
#if HAVE_VALGRIND_H
#define smx_context_usable_stack_size \
((smx_context_stack_size - sizeof(unsigned int)) & ~0xf) /* for valgrind_stack_id */