lkml.org 
[lkml]   [2014]   [Apr]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [perf] more perf_fuzzer memory corruption
On Fri, Apr 18, 2014 at 06:59:58PM +0200, Peter Zijlstra wrote:
> On Fri, Apr 18, 2014 at 05:23:14PM +0200, Peter Zijlstra wrote:
> > OK, that's a good clue. That looks like we're freeing events that still
> > are on the owner list, which would indicate we're freeing events that
> > have a refcount.
> >
> > I added a WARN in free_event() to check the refcount, along with a
> > number of false positives (through the perf_event_open() fail path) I do
> > appear to be getting actual fails here.
> >
> > At least I can 'reproduce' this. Earlier attempts, even based on your
> > .config only got me very mysterious lockups -- I suspect the corruption
> > happens on a slightly different spot or so and completely messes up the
> > machine.
>
> The below should have only made the false positives go away, but my
> machine has magically stopped going all funny on me. Could you give it a
> go?
>

Hmm the fuzzer task seems stuck in kernel space, can't kill it anymore.

So its likely it just didn't get around to doing enough to wreck the
system or so.

/me goes stab it in the eye.


\
 
 \ /
  Last update: 2014-04-18 20:41    [W:0.353 / U:0.528 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site