[testing] Techniques for testing robustness

[jnpkrn]

Just noticed MADV_HWPOISON flag for madvise:

Poison the pages in the range specified by addr and length and
handle subsequent references to those pages like a hardware memory
corruption. This operation is available only for privileged
(CAP_SYS_ADMIN) processes. This operation may result in the
calling process receiving a SIGBUS and the page being unmapped.

This feature is intended for testing of memory error-handling code;
itis available only if the kernel was configured with
CONFIG_MEMORY_FAILURE.

(the flag is enabled in Fedora kernels)