Messages in this thread | | | Date | Sun, 7 Nov 2010 10:47:11 -0800 | From | "Paul E. McKenney" <> | Subject | Re: 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection! |
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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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