linux-kernel - 2.6.35-rc2-git1 - include/linux/cgroup.h:534 invoked rcu_dereference

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Message-ID: <AANLkTin2pPqOUx--9fIX3BH3e-cU6oCRufijcx_4ozx5@mail.gmail.com>
Date:	Mon, 7 Jun 2010 14:14:25 -0400
From:	Miles Lane <miles.lane@...il.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Vivek Goyal <vgoyal@...hat.com>, Eric Paris <eparis@...hat.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, nauman@...gle.com,
	eric.dumazet@...il.com, netdev@...r.kernel.org,
	Jens Axboe <jens.axboe@...cle.com>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Berg <johannes@...solutions.net>
Subject: 2.6.35-rc2-git1 - include/linux/cgroup.h:534 invoked 
	rcu_dereference_check() without protection!

Hi All,

I just reproduced a warning I reported quite a while ago.  Is a patch
for this in the pipeline?

[    0.167267] [ INFO: suspicious rcu_dereference_check() usage. ]
[    0.167396] ---------------------------------------------------
[    0.167526] include/linux/cgroup.h:534 invoked
rcu_dereference_check() without protection!
[    0.167728]
[    0.167729] other info that might help us debug this:
[    0.167731]
[    0.168092]
[    0.168093] rcu_scheduler_active = 1, debug_locks = 1
[    0.168337] no locks held by watchdog/0/5.
[    0.168462]
[    0.168463] stack backtrace:
[    0.168704] Pid: 5, comm: watchdog/0 Not tainted 2.6.35-rc2-git1 #8
[    0.168834] Call Trace:
[    0.168965]  [<ffffffff81064e9c>] lockdep_rcu_dereference+0x9d/0xa5
[    0.169100]  [<ffffffff8102c1ce>] task_subsys_state+0x59/0x70
[    0.169232]  [<ffffffff8103189b>] __sched_setscheduler+0x19d/0x2f8
[    0.169365]  [<ffffffff8102a5ef>] ? need_resched+0x1e/0x28
[    0.169497]  [<ffffffff813c7d01>] ? schedule+0x586/0x619
[    0.169628]  [<ffffffff81081c33>] ? watchdog+0x0/0x8c
[    0.169758]  [<ffffffff81031a11>] sched_setscheduler+0xe/0x10
[    0.169889]  [<ffffffff81081c5d>] watchdog+0x2a/0x8c
[    0.170010]  [<ffffffff81081c33>] ? watchdog+0x0/0x8c
[    0.170141]  [<ffffffff81054a82>] kthread+0x89/0x91
[    0.170274]  [<ffffffff81003054>] kernel_thread_helper+0x4/0x10
[    0.170405]  [<ffffffff813ca480>] ? restore_args+0x0/0x30
[    0.170536]  [<ffffffff810549f9>] ? kthread+0x0/0x91
[    0.170667]  [<ffffffff81003050>] ? kernel_thread_helper+0x0/0x10
[    0.176751] lockdep: fixing up alternatives.
--
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