Hi:
I am getting this in the current linus tree.
[ 0.408781] ===============================
[ 0.408783] [ INFO: suspicious RCU usage. ]
[ 0.408786] 3.6.0-canneverbe-07124-g5f3d2f2 #18 Not tainted
[ 0.408789] -------------------------------
[ 0.408791] include/linux/cgroup.h:566 suspicious
rcu_dereference_check() usage!
[ 0.408795]
[ 0.408795] other info that might help us debug this:
[ 0.408795]
[ 0.408799]
[ 0.408799] rcu_scheduler_active = 1, debug_locks = 0
[ 0.408802] 2 locks held by kdevtmpfs/49:
[ 0.408804] #0: (sb_writers){.+.+.+}, at: [<ffffffff8119a2ef>]
mnt_want_write+0x1f/0x50
[ 0.408814] #1: (&sb->s_type->i_mutex_key#3/1){+.+.+.}, at:
[<ffffffff811857cf>] kern_path_create+0x7f/0x170
[ 0.408822]
[ 0.408822] stack backtrace:
[ 0.408825] Pid: 49, comm: kdevtmpfs Not tainted
3.6.0-canneverbe-07124-g5f3d2f2 #18
[ 0.408829] Call Trace:
[ 0.408834] [<ffffffff8109fabd>] lockdep_rcu_suspicious+0xfd/0x130
[ 0.408838] [<ffffffff812a876d>] devcgroup_inode_mknod+0x18d/0x230
[ 0.408843] [<ffffffff8126f923>] ? security_capable+0x13/0x20
[ 0.408848] [<ffffffff8104a06f>] ? ns_capable+0x3f/0x80
[ 0.408851] [<ffffffff81186c09>] vfs_mknod+0x79/0x140
[ 0.408856] [<ffffffff813a6df2>] handle_create.isra.2+0x72/0x200
[ 0.408860] [<ffffffff813a702c>] ? devtmpfsd+0xac/0x140
[ 0.408863] [<ffffffff813a7094>] devtmpfsd+0x114/0x140
[ 0.408867] [<ffffffff813a6f80>] ? handle_create.isra.2+0x200/0x200
[ 0.408871] [<ffffffff81064de6>] kthread+0xd6/0xe0
[ 0.408877] [<ffffffff81578cb4>] kernel_thread_helper+0x4/0x10
[ 0.408881] [<ffffffff8156f85c>] ? retint_restore_args+0xe/0xe
[ 0.408885] [<ffffffff81064d10>] ? flush_kthread_work+0x190/0x190
[ 0.408889] [<ffffffff81578cb0>] ? gs_change+0xb/0xb
Hope someone can take a look at it.
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