[lkml]   [2014]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: frequent lockups in 3.18rc4
On Fri, Nov 21, 2014 at 9:34 AM, Steven Rostedt <> wrote:
> I see. You have issues with the use of current->active_mm instead of
> just doing a read_cr3() (and I'm sure other things).

Yes. And I have this memory of it actually mattering, where we'd get
get the page fault, but see that the (wrong) page table is already
populated, and say "ti wasn't a vmalloc fault", and then go down the
oops path.

Of course, the context switch itself has changed completely over the
years, but I think it would still be true with NMI. "active_mm" may
point to a different page table than the one the CPU is actually
using, and then the whole thing is bogus.


 \ /
  Last update: 2014-11-21 20:01    [W:0.340 / U:1.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site