* 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection!
@ 2010-10-29 5:22 Miles Lane
2010-11-07 18:47 ` Paul E. McKenney
0 siblings, 1 reply; 4+ messages in thread
From: Miles Lane @ 2010-10-29 5:22 UTC (permalink / raw)
To: LKML, Paul E. McKenney
[ 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
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection!
2010-10-29 5:22 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection! Miles Lane
@ 2010-11-07 18:47 ` Paul E. McKenney
2010-11-08 21:00 ` Miles Lane
0 siblings, 1 reply; 4+ messages in thread
From: Paul E. McKenney @ 2010-11-07 18:47 UTC (permalink / raw)
To: Miles Lane; +Cc: LKML
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
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection!
2010-11-07 18:47 ` Paul E. McKenney
@ 2010-11-08 21:00 ` Miles Lane
2010-11-08 21:08 ` Paul E. McKenney
0 siblings, 1 reply; 4+ messages in thread
From: Miles Lane @ 2010-11-08 21:00 UTC (permalink / raw)
To: paulmck; +Cc: LKML
Great! Works here. :-)
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
>
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection!
2010-11-08 21:00 ` Miles Lane
@ 2010-11-08 21:08 ` Paul E. McKenney
0 siblings, 0 replies; 4+ messages in thread
From: Paul E. McKenney @ 2010-11-08 21:08 UTC (permalink / raw)
To: Miles Lane; +Cc: LKML
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
> >
^ permalink raw reply [flat|nested] 4+ messages in thread
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2010-10-29 5:22 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check() without protection! Miles Lane
2010-11-07 18:47 ` Paul E. McKenney
2010-11-08 21:00 ` Miles Lane
2010-11-08 21:08 ` Paul E. McKenney
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