linux-kernel - [-next] fs/eventpoll.c:545 suspicious rcu_dereference

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Message-ID: <20130322104248.GA2589@swordfish.minsk.epam.com>
Date:	Fri, 22 Mar 2013 13:42:48 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [-next] fs/eventpoll.c:545 suspicious rcu_dereference_check() usage

Hello,

got this with today's linux-next

[    3.163894] ===============================
[    3.163895] [ INFO: suspicious RCU usage. ]
[    3.163897] 3.9.0-rc3-next-20130322-dbg-dirty #1 Not tainted
[    3.163898] -------------------------------
[    3.163900] fs/eventpoll.c:545 suspicious rcu_dereference_check() usage!
[    3.163900] other info that might help us debug this:
[    3.163902] rcu_scheduler_active = 1, debug_locks = 1
[    3.163903] 2 locks held by ata_id/763:
[    3.163915]  #0:  (&pipe->wait){......}, at: [<ffffffff810757a7>] __wake_up_sync_key+0x37/0x80
[    3.163923]  #1:  (&(&ep->lock)->rlock){......}, at: [<ffffffff811bb4a9>] ep_poll_callback+0x59/0x1f0
[    3.163924] 	stack backtrace:
[    3.163927] Pid: 763, comm: ata_id Not tainted 3.9.0-rc3-next-20130322-dbg-dirty #1
[    3.163929] Call Trace:
[    3.163940]  [<ffffffff810a7c66>] lockdep_rcu_suspicious+0xe6/0x130
[    3.163945]  [<ffffffff811bb61f>] ep_poll_callback+0x1cf/0x1f0
[    3.163949]  [<ffffffff81074765>] __wake_up_common+0x55/0x90
[    3.163952]  [<ffffffff810757c3>] __wake_up_sync_key+0x53/0x80
[    3.163957]  [<ffffffff811775f8>] pipe_write+0x448/0x590
[    3.163962]  [<ffffffff8116df70>] do_sync_write+0x80/0xb0
[    3.163965]  [<ffffffff8116e938>] vfs_write+0xa8/0x180
[    3.163968]  [<ffffffff8116ec95>] SyS_write+0x55/0xb0
[    3.163975]  [<ffffffff81620506>] system_call_fastpath+0x1a/0x1f



	-ss
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