lkml.org 
[lkml]   [2012]   [May]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: rcu: BUG on exit_group
    On Thu, May 03, 2012 at 05:55:14PM +0200, Sasha Levin wrote:
    > On Thu, May 3, 2012 at 5:41 PM, Paul E. McKenney
    > <paulmck@linux.vnet.ibm.com> wrote:
    > > On Thu, May 03, 2012 at 10:57:19AM +0200, Sasha Levin wrote:
    > >> Hi Paul,
    > >>
    > >> I've hit a BUG similar to the schedule_tail() one when. It happened
    > >> when I've started fuzzing exit_group() syscalls, and all of the traces
    > >> are starting with exit_group() (there's a flood of them).
    > >>
    > >> I've verified that it indeed BUGs due to the rcu preempt count.
    > >
    > > Hello, Sasha,
    > >
    > > Which version of -next are you using?  I did some surgery on this
    > > yesterday based on some bugs Hugh Dickins tracked down, so if you
    > > are using something older, please move to the current -next.
    >
    > I'm using -next from today (3.4.0-rc5-next-20120503-sasha-00002-g09f55ae-dirty).

    Hmmm... Looking at this more closely, it looks like there really is
    an attempt to acquire a mutex within an RCU read-side critical section,
    which is illegal. Could you please bisect this?

    Thanx, Paul

    --
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2012-05-03 19:41    [W:0.024 / U:0.608 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site