I consistently get this when I unmount an NFS volume.
johannes
[ 381.427221] ===================================================
[ 381.427225] [ INFO: suspicious rcu_dereference_check() usage. ]
[ 381.427228] ---------------------------------------------------
[ 381.427232] /home/johannes/sys/wireless-testing/net/sunrpc/auth_gss/auth_gss.c:947 invoked rcu_dereference_check() without protection!
[ 381.427236]
[ 381.427237] other info that might help us debug this:
[ 381.427238]
[ 381.427241]
[ 381.427242] rcu_scheduler_active = 1, debug_locks = 1
[ 381.427246] 2 locks held by rpciod/0/1881:
[ 381.427248] #0: (rpciod){+.+.+.}, at: [<ffffffff810640cf>] run_workqueue+0x11f/0x3c0
[ 381.427262] #1: ((&task->u.tk_work)){+.+.+.}, at: [<ffffffff810640cf>] run_workqueue+0x11f/0x3c0
[ 381.427271]
[ 381.427272] stack backtrace:
[ 381.427276] Pid: 1881, comm: rpciod/0 Not tainted 2.6.35-rc6-wl-47665-gc2e2180-dirty #174
[ 381.427280] Call Trace:
[ 381.427289] [<ffffffff8107e494>] lockdep_rcu_dereference+0xa4/0xc0
[ 381.427297] [<ffffffffa05e0191>] gss_free_ctx+0x91/0xa0 [auth_rpcgss]
[ 381.427311] [<ffffffffa05e19ed>] gss_destroy_nullcred+0x4d/0x70 [auth_rpcgss]
[ 381.427331] [<ffffffffa0598f97>] put_rpccred+0x127/0x140 [sunrpc]
[ 381.427348] [<ffffffffa059922e>] rpcauth_unbindcred+0x2e/0x70 [sunrpc]
[ 381.427371] [<ffffffffa05970ea>] rpc_put_task+0x3a/0xd0 [sunrpc]
[ 381.427386] [<ffffffffa0597810>] rpc_release_task+0x70/0xa0 [sunrpc]
[ 381.427402] [<ffffffffa0598229>] __rpc_execute+0x179/0x200 [sunrpc]
[ 381.427433] [<ffffffffa05982f5>] rpc_async_schedule+0x15/0x20 [sunrpc]
[ 381.427438] [<ffffffff81064120>] run_workqueue+0x170/0x3c0
[ 381.427457] [<ffffffff81064413>] worker_thread+0xa3/0x110
[ 381.427472] [<ffffffff81069386>] kthread+0x96/0xa0
[ 381.427479] [<ffffffff81003514>] kernel_thread_helper+0x4/0x10
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