On Wed, Nov 01, 2017 at 01:59:06PM -0500, Yazen Ghannam wrote:
> From: Yazen Ghannam <[email protected]>
>
> The AMD severity grading function was introduced in v4.1 and has remained
> logically unchanged with the exception of a separate SMCA severity grading
> function for SMCA systems. The current logic can possibly give
> MCE_AR_SEVERITY for uncorrectable errors in kernel context. The system may
> then get stuck in a loop as memory_failure() will try to handle the bad
> kernel memory and find it busy.
>
> Return MCE_PANIC_SEVERITY for all UC errors IN_KERNEL context on AMD
> systems.
>
> After:
>
> b2f9d678e28c ("x86/mce: Check for faults tagged in EXTABLE_CLASS_FAULT
> exception table entries")
>
> was accepted in v4.6, this issue was masked because of the tail-end attempt
> at kernel mode recovery in the #MC handler.
>
> However, uncorrectable errors IN_KERNEL context should always be considered
> unrecoverable and cause a panic.
>
> Fixes: bf80bbd7dcf5 (x86/mce: Add an AMD severities-grading function)
>
> Signed-off-by: Yazen Ghannam <[email protected]>
> [ This needs to be reworked to apply to v4.1 and v4.4 stable branches.]
> Cc: <[email protected]> # 4.9.x
> ---
> Link:
> https://lkml.kernel.org/r/[email protected]
>
> v1->v2:
> * Update commit message.
>
> arch/x86/kernel/cpu/mcheck/mce-severity.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
Applied, thanks.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
