Hi Paul, > I gave that a shot by installing the attached.
Thanks. I found the relevant references now, in [1]. The fact that some people see it not as a property of the malloc() function but as a GCC bug [2] indicates that it should also apply when alloca() is used to allocate the memory. (In this case, a program would not crash when it makes out-of-bounds accesses on the stack, but valgrind may still report accesses to uninitialized memory.) Bruno [1] https://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commitdiff;h=4c32543a4f05706ca3a8c8d583a5fb35d0e58828 [2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66661
