lkml.org 
[lkml]   [2014]   [Sep]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 6/9] torture: Address race in module cleanup
On Fri, Sep 12, 2014 at 11:28:36AM -0700, Davidlohr Bueso wrote:
> On Fri, 2014-09-12 at 11:04 -0700, Paul E. McKenney wrote:
> > On Thu, Sep 11, 2014 at 08:40:21PM -0700, Davidlohr Bueso wrote:
> > > When performing module cleanups by calling torture_cleanup() the
> > > 'torture_type' string in nullified However, callers are not necessarily
> > > done, and might still need to reference the variable. This impacts
> > > both rcutorture and locktorture, causing printing things like:
> > >
> > > [ 94.226618] (null)-torture: Stopping lock_torture_writer task
> > > [ 94.226624] (null)-torture: Stopping lock_torture_stats task
> > >
> > > Thus delay this operation until the very end of the cleanup process.
> > > The consequence (which shouldn't matter for this kid of program) is,
> > > of course, that we delay the window between rmmod and modprobing,
> > > for instance in module_torture_begin().
> > >
> > > Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
> >
> > Good catch! I had just been ignoring the (null), and my scripting
> > doesn't care, but it is better to have it taken care of.
>
> In addition, for locktorture this issue can cause not only null but the
> printing the wrong cleanup string when a new module is loaded with a
> different torture_type.

That would be even more annoying. ;-)

Thanx, Paul



\
 
 \ /
  Last update: 2014-09-12 21:41    [W:0.051 / U:0.644 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site