linux-kernel - 2.6.35-rc4 - include/linux/fdtable.h:85 invoked rcu_dereference

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Date:	Tue, 6 Jul 2010 20:25:56 -0400
From:	Miles Lane <miles.lane@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: 2.6.35-rc4 - include/linux/fdtable.h:85 invoked rcu_dereference_check() 
	without protection!

 [ INFO: suspicious rcu_dereference_check() usage. ]
 ---------------------------------------------------
 include/linux/fdtable.h:85 invoked rcu_dereference_check() without protection!

 other info that might help us debug this:

 rcu_scheduler_active = 1, debug_locks = 1
 no locks held by compiz/4286.

 stack backtrace:
 Pid: 4286, comm: compiz Not tainted 2.6.35-rc4 #6
 Call Trace:
  [<ffffffff8106714e>] lockdep_rcu_dereference+0x9d/0xa6
  [<ffffffff810d3bdd>] fcheck_files+0x5c/0xca
  [<ffffffff810d3ca3>] fget_light+0x35/0x96
  [<ffffffff810e1b02>] do_sys_poll+0x1ff/0x3e5
  [<ffffffff810e1316>] ? __pollwait+0x0/0xc7
  [<ffffffff810e13dd>] ? pollwake+0x0/0x4f
  [<ffffffff8125b785>] ? __sock_sendmsg+0x66/0x72
  [<ffffffff8125da9e>] ? sock_aio_write+0x0/0xf6
  [<ffffffff8125db7f>] ? sock_aio_write+0xe1/0xf6
  [<ffffffff810d295f>] ? do_sync_readv_writev+0xbc/0xfb
  [<ffffffff810d284f>] ? fsnotify_modify+0x67/0x6f
  [<ffffffff810d35eb>] ? do_readv_writev+0x109/0x122
  [<ffffffff81009cba>] ? sysret_check+0x2e/0x69
  [<ffffffff810e1e7c>] sys_poll+0x50/0xba
  [<ffffffff81009c82>] system_call_fastpath+0x16/0x1b

===============================================================================

 [ INFO: suspicious rcu_dereference_check() usage. ]
 ---------------------------------------------------
 include/linux/fdtable.h:88 invoked rcu_dereference_check() without protection!

 other info that might help us debug this:

 rcu_scheduler_active = 1, debug_locks = 1
 no locks held by gnome-panel/4293.

 stack backtrace:
 Pid: 4293, comm: gnome-panel Not tainted 2.6.35-rc4 #6
 Call Trace:
  [<ffffffff8106714e>] lockdep_rcu_dereference+0x9d/0xa6
  [<ffffffff810d3c32>] fcheck_files+0xb1/0xca
  [<ffffffff810ab263>] ? might_fault+0x63/0xb3
  [<ffffffff810d3ca3>] fget_light+0x35/0x96
  [<ffffffff810e1b02>] do_sys_poll+0x1ff/0x3e5
  [<ffffffff810e1316>] ? __pollwait+0x0/0xc7
  [<ffffffff8125a2ae>] ? __sock_recvmsg_nosec+0x65/0x6e
  [<ffffffff8125b7da>] ? __sock_recvmsg+0x49/0x54
  [<ffffffff8125da8a>] ? sock_aio_read+0xe8/0xfc
  [<ffffffff810d2b67>] ? do_sync_read+0xc6/0x103
  [<ffffffff81009cba>] ? sysret_check+0x2e/0x69
  [<ffffffff810e1e7c>] sys_poll+0x50/0xba
  [<ffffffff81009c82>] system_call_fastpath+0x16/0x1b
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