On Mon, 8 Mar 2021 18:31:07 +0000
"Luck, Tony" <tony.l...@intel.com> wrote:
> > Can you point me at that SIGBUS code in a current kernel?
>
> It is in kill_me_maybe(). mce_vaddr is setup when we disassemble whatever
> get_user()
> or copy from user variant was in use in the kernel when the poison memory was
> consumed.
>
> if (p->mce_vaddr != (void __user *)-1l) {
> force_sig_mceerr(BUS_MCEERR_AR, p->mce_vaddr, PAGE_SHIFT);
>
> Would it be any better if we used the BUS_MCEERR_AO code that goes into
> siginfo?
>
> That would make it match up better with what happens when poison is found
> asynchronously by the patrol scrubber. I.e. the semantics are:
>
> AR: You just touched poison at this address and need to do something about
> that.
> AO: Just letting you know that you have some poison at the address in siginfo.
>
> -Tony
Is the kill action for this scenario in memory_failure()?
--
Thanks!
Aili Yao
