linux-kernel - suspicious rcu_dereference_check at kernel/sched.c:618

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Date:	Tue, 05 Oct 2010 14:04:02 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: suspicious rcu_dereference_check at kernel/sched.c:618

This is from a wireless-testing tree (2.6.36-rc6 + wireless hacks).

I see this fairly often, and would be happy to test patches :)

===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
/home/greearb/git/linux.wireless-testing/kernel/sched.c:618 invoked rcu_dereference_check() without protection!

other info that might help us debug this:


rcu_scheduler_active = 1, debug_locks = 1
1 lock held by ifup/23517:
  #0:  (&rq->lock){-.-.-.}, at: [<c042f782>] task_fork_fair+0x3b/0x108

stack backtrace:
Pid: 23517, comm: ifup Not tainted 2.6.36-rc6-wl+ #5
Call Trace:
  [<c075e219>] ? printk+0xf/0x16
  [<c0455842>] lockdep_rcu_dereference+0x74/0x7d
  [<c0426854>] task_group+0x6d/0x79
  [<c042686e>] set_task_rq+0xe/0x57
  [<c042f79e>] task_fork_fair+0x57/0x108
  [<c042e965>] sched_fork+0x82/0xf9
  [<c04334b3>] copy_process+0x569/0xe8e
  [<c0433ef0>] do_fork+0x118/0x262
  [<c076302f>] ? do_page_fault+0x16a/0x2cf
  [<c044b80c>] ? up_read+0x16/0x2a
  [<c04085ae>] sys_clone+0x1b/0x20
  [<c04030a5>] ptregs_clone+0x15/0x30
  [<c0402f1c>] ? sysenter_do_call+0x12/0x38


Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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