linux-kernel - GIT 3.7.0-rc2+ -- INFO: suspicious RCU usage -- include/linux/cgroup.h:566 suspicious rcu_dereference

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Message-ID: <CAHFgRy_oKH2iMLC39JfGDaO9sziHwcXOpctuncKHssh5BQM0Cw@mail.gmail.com>
Date:	Tue, 23 Oct 2012 09:50:42 -0400
From:	Miles Lane <miles.lane@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Li Zefan <lizefan@...wei.com>
Subject: GIT 3.7.0-rc2+ -- INFO: suspicious RCU usage -- include/linux/cgroup.h:566
 suspicious rcu_dereference_check() usage!

[    3.110632] [ INFO: suspicious RCU usage. ]
[    3.110632] 3.7.0-rc2+ #44 Not tainted
[    3.110632] -------------------------------
[    3.110632] include/linux/cgroup.h:566 suspicious
rcu_dereference_check() usage!
[    3.110632]
[    3.110632] other info that might help us debug this:
[    3.110632]
[    3.110632]
[    3.110632] rcu_scheduler_active = 1, debug_locks = 1
[    3.110632] 2 locks held by kdevtmpfs/22:
[    3.110632]  #0:  (sb_writers){.+.+.+}, at: [<ffffffff810f896e>]
mnt_want_write+0x1f/0x46
[    3.110632]  #1:  (&sb->s_type->i_mutex_key#3/1){+.+.+.}, at:
[<ffffffff810e9e98>] kern_path_create+0x7e/0x13f
[    3.110632]
[    3.110632] stack backtrace:
[    3.110632] Pid: 22, comm: kdevtmpfs Not tainted 3.7.0-rc2+ #44
[    3.110632] Call Trace:
[    3.110632]  [<ffffffff8106b054>] lockdep_rcu_suspicious+0xfc/0x105
[    3.110632]  [<ffffffff8119a707>] task_subsys_state.constprop.8+0x68/0x70
[    3.110632]  [<ffffffff8119adbe>] devcgroup_inode_mknod+0x20/0x9e
[    3.110632]  [<ffffffff81192798>] ? security_capable+0x13/0x15
[    3.110632]  [<ffffffff81037ce4>] ? ns_capable+0x48/0x60
[    3.110632]  [<ffffffff810ea36f>] vfs_mknod+0x64/0xb0
[    3.110632]  [<ffffffff81251468>] handle_create.isra.2+0x13f/0x1b0
[    3.110632]  [<ffffffff81251582>] ? devtmpfsd+0xa9/0x156
[    3.110632]  [<ffffffff812515a5>] ? devtmpfsd+0xcc/0x156
[    3.110632]  [<ffffffff812514d9>] ? handle_create.isra.2+0x1b0/0x1b0
[    3.110632]  [<ffffffff812515c7>] devtmpfsd+0xee/0x156
[    3.110632]  [<ffffffff812514d9>] ? handle_create.isra.2+0x1b0/0x1b0
[    3.110632]  [<ffffffff81047ffb>] kthread+0xac/0xb4
[    3.110632]  [<ffffffff81047f4f>] ? __kthread_parkme+0x60/0x60
[    3.110632]  [<ffffffff81363e6c>] ret_from_fork+0x7c/0xb0
[    3.110632]  [<ffffffff81047f4f>] ? __kthread_parkme+0x60/0x60
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