lkml.org 
[lkml]   [2014]   [Nov]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: frequent lockups in 3.18rc4
On Wed, Nov 19, 2014 at 11:38:09AM -0800, Linus Torvalds wrote:

> > Is it possible that we've managed to return to userspace with
> > interrupts off somehow? A loop in userspace that somehow has
> > interrupts off can cause all kinds of fun lockups.
>
> That sounds unlikely, but if there is some stack corruption going on.
>
> However, it wouldn't even explain things, because even if interrupts
> had been disabled in user space, and even if that popf got executed,
> this wouldn't be where they got enabled. That would be the :"sti" in
> the system call entry path (hidden behind the ENABLE_INTERRUPTS
> macro).
>
> Of course, maybe Dave has paravirtualization enabled (what a crock
> _that_ is), and there is something wrong with that whole code.

I've had HYPERVISOR_GUEST disabled for a while, which also disables
the paravirt code afaics.

Dave



\
 
 \ /
  Last update: 2014-11-20 00:01    [W:1.163 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site