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)

Thomas Gleixner
2009-11-12T23:10:00Z

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