Messages in this thread |  | | | Date | Sat, 4 Jul 2009 08:36:46 +0200 | | From | Jarek Poplawski <> | | Subject | Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 ( possibly?caused by netem) |
On Fri, Jul 03, 2009 at 06:55:53PM -0700, David Miller wrote: > From: Jarek Poplawski <jarkao2@gmail.com> > Date: Sat, 4 Jul 2009 00:56:40 +0200 > > > On Fri, Jul 03, 2009 at 01:22:20PM -0700, David Miller wrote: > >> Well, if you look at that commit the bisect pointed to Jarek, it is a > >> change which starts causing a situation which never happened before. > >> Namely, timers added on one cpu can be migrated and fire on another. > >> > >> So this could be exposing races in the networking that technically > >> always existed. > > > > I'm not sure I get your point; could you give some example? > > Actually, I've suspected races in timers code. > > Let's say that a particular networking timer always gets > re-added on the cpu where the timer fires. > > In that case, beforehand, no inter-cpu races could possibly > be tested. But with the new timer code, such races could > now be potentially triggered.
Maybe I still miss something, but even if it were possible, lockdep should have reported such things long ago.
Jarek P.
|  |