On Feb 23, 2021, at 4:44 AM, Aili Yao [off-list ref] wrote:

On Fri, 5 Feb 2021 17:01:35 +0800
Aili Yao [off-list ref] wrote:

quoted

When one page is already hwpoisoned by MCE AO action, processes may not
be killed, processes mapping this page may make a syscall include this
page and result to trigger a VM_FAULT_HWPOISON fault, as it's in kernel
mode it may be fixed by fixup_exception, current code will just return
error code to user code.

This is not sufficient, we should send a SIGBUS to the process and log
the info to console, as we can't trust the process will handle the error
correctly.

Suggested-by: Feng Yang <redacted>
Signed-off-by: Aili Yao <redacted>
---
arch/x86/mm/fault.c | 62 +++++++++++++++++++++++++++++----------------
1 file changed, 40 insertions(+), 22 deletions(-)

Hi luto;
 Is there any feedback?

At the very least, this needs a clear explanation of why your proposed behavior is better than the existing behavior.

Thanks
Aili Yao