linux-kernel - suspicious rcu_dereference_check in post

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Message-ID: <20110523222822.GA7027@redhat.com>
Date:	Mon, 23 May 2011 18:28:22 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	mingo@...e.hu
Subject: suspicious rcu_dereference_check in post_schedule.

just noticed this on a build of Linus' tree from sometime yesterday.

	Dave

===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
kernel/sched_rt.c:1266 invoked rcu_dereference_check() without protection!

other info that might help us debug this:


rcu_scheduler_active = 1, debug_locks = 0
1 lock held by watchdog/0/12:
 #0:  (&rq->lock){-.-.-.}, at: [<ffffffff8104c460>] post_schedule.part.25+0x14/0x4a

stack backtrace:
Pid: 12, comm: watchdog/0 Not tainted 2.6.39+ #43
Call Trace:
 [<ffffffff8108c376>] lockdep_rcu_dereference+0xa7/0xaf
 [<ffffffff8104b7ee>] find_lowest_rq+0x11b/0x19a
 [<ffffffff81055667>] push_rt_task.part.69+0x7b/0x1d2
 [<ffffffff810558cc>] post_schedule_rt+0x1f/0x27
 [<ffffffff8104c47c>] post_schedule.part.25+0x30/0x4a
 [<ffffffff814c8ac9>] schedule+0x76e/0x7ca
 [<ffffffff810bf0af>] ? watchdog_enable+0x194/0x194
 [<ffffffff810bf0af>] ? watchdog_enable+0x194/0x194
 [<ffffffff810bf122>] watchdog+0x73/0xb6
 [<ffffffff810793e9>] kthread+0xa8/0xb0
 [<ffffffff814ce230>] ? sub_preempt_count+0xa1/0xb4
 [<ffffffff814d24a4>] kernel_thread_helper+0x4/0x10
 [<ffffffff814cb698>] ? retint_restore_args+0x13/0x13
 [<ffffffff81079341>] ? __init_kthread_worker+0x5a/0x5a
 [<ffffffff814d24a0>] ? gs_change+0x13/0x13

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