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    SubjectRe: 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection!
    On Mon, Nov 08, 2010 at 04:00:51PM -0500, Miles Lane wrote:
    > Great! Works here. :-)

    Thank you for testing it, Miles!

    Thanx, Paul

    > On Sun, Nov 7, 2010 at 1:47 PM, Paul E. McKenney
    > <paulmck@linux.vnet.ibm.com> wrote:
    > > On Fri, Oct 29, 2010 at 01:22:28AM -0400, Miles Lane wrote:
    > >> [ INFO: suspicious rcu_dereference_check() usage. ]
    > >> ---------------------------------------------------
    > >> kernel/pid.c:419 invoked rcu_dereference_check() without protection!
    > >>
    > >> other info that might help us debug this:
    > >>
    > >>
    > >> rcu_scheduler_active = 1, debug_locks = 1
    > >> 1 lock held by ureadahead/943:
    > >>  #0:  (tasklist_lock){.+.+..}, at: [<ffffffff810ec497>]
    > >> sys_ioprio_set+0x8e/0x2aa
    > >>
    > >> stack backtrace:
    > >> Pid: 943, comm: ureadahead Not tainted 2.6.36-git11 #8
    > >> Call Trace:
    > >>  [<ffffffff8105d335>] lockdep_rcu_dereference+0x9d/0xa5
    > >>  [<ffffffff8104c825>] find_task_by_pid_ns+0x3f/0x58
    > >>  [<ffffffff8104c85b>] find_task_by_vpid+0x1d/0x1f
    > >>  [<ffffffff810ec4c6>] sys_ioprio_set+0xbd/0x2aa
    > >>  [<ffffffff813547a3>] ? trace_hardirqs_on_thunk+0x3a/0x3f
    > >>  [<ffffffff81002aab>] system_call_fastpath+0x16/0x1b
    > >
    > > Could you please try the patch from Sergey Senozhatsky, currently
    > > in -mm, that may be found at http://lkml.org/lkml/2010/10/29/168?
    > >
    > >                                                        Thanx, Paul
    > >
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