Re: [BUG stable, 2.6.32.27] sched: delayed cleanup of user_struct

Mike Galbraith
2011-01-10T17:08:19Z

On Mon, 2011-01-10 at 15:19 +0100, Oleg Nesterov wrote:
> On 01/10, Stefan Priebe - Profihost AG wrote:
> >
> >>> You can find the logs here:
> >>> http://pastebin.com/hNd15E8K
> >>
> >> Good. Sadly, I didn't see this trace before...
> >>
> >> kernel BUG at kernel/workqueue.c:287!
> >>
> >> this matches "INIT_DELAYED_WORK() can corrupt the pending work" I
> >> mentioned.
> > Sorry to ask this but this could also be "workarounded" by disabled
> > GROUP_SCHED? Or is this another thing?
>
> Yes, this looks like the same thing.
>
> But let me repeat, today I looked at this code for the first time ;)
>
> > Will wait if greg or anybody else can tell
> > us something about it.
>
> Indeed.

I'd be inclined to just shoot USER_SCHED, since it's dead upstream. I'm
putting a small backport series together, and could add that to the mix.

-Mike