svn commit: r314216 - head/sys/x86/x86

[Jonathan Looney]

On Fri, Feb 24, 2017 at 3:19 PM, hiren panchasara <
hiren at strugglingcoder.info> wrote:

> On 02/24/17 at 06:56P, Jonathan T. Looney wrote:
> > Author: jtl
> > Date: Fri Feb 24 18:56:00 2017
> > New Revision: 314216
> > URL: https://svnweb.freebsd.org/changeset/base/314216
> >
> > Log:
> >   We have seen several cases recently where we appear to get a
> double-fault:
> >   We have an original panic. Then, instead of writing the core to the
> dump
> >   device, the kernel has a second panic: "smp_targeted_tlb_shootdown:
> >   interrupts disabled". This change is an attempt to fix that second
> panic.
> >
> >   When the other CPUs are stopped, we can't notify them of the TLB
> shootdown,
> >   so we skip that operation. However, when the CPUs come back up, we
> >   invalidate the TLB to ensure they correctly observe any changes to the
> >   page mappings.
> >
> >   Reviewed by:        kib
> >   Sponsored by:       Netflix
> >   Differential Revision:      https://reviews.freebsd.org/D9786
>
> Can this be MFCd to 11?
>

It can be. I didn't propose it because I have only seen the problem on
-CURRENT. But, I see no obstacle to MFCing to stable/11, if you want to see
it there.

Jonathan