linux-kernel - 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference

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Message-ID: <AANLkTimGgzOZb8EwUQO16cZcL+ycveKTYzg_AAX+D+Kw@mail.gmail.com>
Date:	Fri, 29 Oct 2010 01:22:28 -0400
From:	Miles Lane <miles.lane@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: 2.6.36-git11 -- kernel/pid.c:419 invoked rcu_dereference_check()
 without protection!

[ 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
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