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SubjectRe: 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection!
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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