linux-kernel - Re: GPF in run_workqueue()/list_del_init(cwq->worklist.next) on resume (was: Re: Help needed: Resume problems in 2.6.32-rc, perhaps related to preempt

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Date:	Fri, 13 Nov 2009 00:08:32 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Greg KH <gregkh@...e.de>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: GPF in run_workqueue()/list_del_init(cwq->worklist.next) on
 resume (was: Re: Help needed: Resume problems in 2.6.32-rc, perhaps related
 to preempt_count leakage in keventd)

On Thu, 12 Nov 2009, Rafael J. Wysocki wrote:
> > debugobjects should catch the attempt to free the memory which holds
> > the work_struct, cancel it and print a backtrace where this happened.
> 
> I got the appended trace, so I guess it works.

Yup. I assume the box survived otherwise you wouldnt have retrieved
the backtrace.

> [   93.028997] ODEBUG: free active object type: work_struct

Active work_struct is freed

> [   93.039180]  [<ffffffff810c8d7c>] kfree+0x71/0x88
> [   93.039282]  [<ffffffffa03d36f1>] btusb_destruct+0x10/0x12 [btusb]

Here is the offending code and it's call chain.

> [   93.039282]  [<ffffffffa03d36d0>] btusb_disconnect+0x81/0x92 [btusb]
> [   93.039282]  [<ffffffffa00c6612>] usb_unbind_interface+0x5e/0xe1 [usbcore]
> [   93.039282]  [<ffffffff811ebead>] __device_release_driver+0x70/0xbe
> [   93.039282]  [<ffffffff811ebfc6>] device_release_driver+0x1e/0x2b
> [   93.040317]  [<ffffffff811ebb46>] bus_remove_device+0x83/0x92
> [   93.040317]  [<ffffffff811e9940>] device_del+0x12e/0x170
> [   93.040317]  [<ffffffffa00c3adf>] usb_disable_device+0x76/0xf5 [usbcore]
> [   93.040317]  [<ffffffffa00becfb>] usb_disconnect+0x96/0xfa [usbcore]
> [   93.040317]  [<ffffffffa00bf927>] hub_thread+0x493/0xe2c [usbcore]
> [   93.040317]  [<ffffffff81058465>] ? autoremove_wake_function+0x0/0x38
> [   93.040317]  [<ffffffff81293de6>] ? preempt_schedule+0x3b/0x41
> [   93.040317]  [<ffffffffa00bf494>] ? hub_thread+0x0/0xe2c [usbcore]
> [   93.040317]  [<ffffffff8105823e>] kthread+0x69/0x71
> [   93.040317]  [<ffffffff8100c16a>] child_rip+0xa/0x20
> [   93.042128]  [<ffffffff810581d5>] ? kthread+0x0/0x71
> [   93.042393]  [<ffffffff8100c160>] ? child_rip+0x0/0x20
> [   93.042478] ---[ end trace 6915b286c29296ce ]---

That does not necessary tell you which of the work_structs in the
bluetooth code it is, but it limits the search of culprits
significantly.

Thanks for testing and confirming.

       tglx
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