linux-kernel - 2.6.35-rc2-git1 - lib/idr.c:605 invoked rcu_dereference

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Message-ID: <AANLkTim06fRB-Kvm12v2umq8MxRxbcl3gdbNsiRTDmia@mail.gmail.com>
Date:	Mon, 7 Jun 2010 14:23:17 -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>,
	David Woodhouse <dwmw2@...radead.org>,
	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 <axboe@...nel.dk>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Berg <johannes@...solutions.net>
Subject: 2.6.35-rc2-git1 - lib/idr.c:605 invoked rcu_dereference_check() 
	without protection!

[    2.677955] [ INFO: suspicious rcu_dereference_check() usage. ]
[    2.679089] ---------------------------------------------------
[    2.680276] lib/idr.c:605 invoked rcu_dereference_check() without protection!
[    2.681499]
[    2.681500] other info that might help us debug this:
[    2.681501]
[    2.685509]
[    2.685510] rcu_scheduler_active = 1, debug_locks = 1
[    2.688221] 1 lock held by swapper/1:
[    2.689587]  #0:  (mtd_table_mutex){+.+...}, at:
[<ffffffff812bea45>] register_mtd_user+0x1a/0x69
[    2.691096]
[    2.691098] stack backtrace:
[    2.694059] Pid: 1, comm: swapper Not tainted 2.6.35-rc2-git1 #8
[    2.695601] Call Trace:
[    2.697243]  [<ffffffff81064e9c>] lockdep_rcu_dereference+0x9d/0xa5
[    2.698868]  [<ffffffff811b9c86>] idr_get_next+0x60/0x124
[    2.700556]  [<ffffffff812be779>] __mtd_next_device+0x1b/0x1d
[    2.702238]  [<ffffffff812bea7c>] register_mtd_user+0x51/0x69
[    2.703964]  [<ffffffff816cca45>] init_mtdchar+0xb3/0xd3
[    2.705686]  [<ffffffff816cc992>] ? init_mtdchar+0x0/0xd3
[    2.707470]  [<ffffffff810001ef>] do_one_initcall+0x59/0x14e
[    2.709255]  [<ffffffff816a768a>] kernel_init+0x144/0x1ce
[    2.711082]  [<ffffffff81003054>] kernel_thread_helper+0x4/0x10
[    2.712862]  [<ffffffff813ca480>] ? restore_args+0x0/0x30
[    2.714647]  [<ffffffff816a7546>] ? kernel_init+0x0/0x1ce
[    2.716415]  [<ffffffff81003050>] ? kernel_thread_helper+0x0/0x10
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