[Bug 116101] New: "Userspace still has active objects" and "trying to unbind memory from uninitialized GART !" when unbinding from radeon

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=116101

            Bug ID: 116101
           Summary: "Userspace still has active objects" and "trying to
                    unbind memory from uninitialized GART !" when
                    unbinding from radeon
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.5.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: MonopolyMan720@aol.com
        Regression: No

Created attachment 212291
  --> https://bugzilla.kernel.org/attachment.cgi?id=212291&action=edit
Journalctl output

I am attempting to unbind my R9 290 from radeon and rebind it to vfio. However,
the entire system hangs when "echo "0000:01:00.0" >
/sys/bus/pci/devices/0000:01:00.0/driver/unbind" is ran as root. 

Steps to Reproduce: 
Run the following script as root

#!/bin/bash
set -x
echo "1002 67b1" > /sys/bus/pci/drivers/vfio-pci/new_id
echo "0000:01:00.0" > /sys/bus/pci/devices/0000:01:00.0/driver/unbind
echo "0000:01:00.0" > /sys/bus/pci/drivers/vfio-pci/bind
echo "1002 67b1" > /sys/bus/pci/drivers/vfio-pci/remove_id

echo "1002 aac8" > /sys/bus/pci/drivers/vfio-pci/new_id
echo "0000:01:00.1" > /sys/bus/pci/devices/0000:01:00.1/driver/unbind
echo "0000:01:00.1" > /sys/bus/pci/drivers/vfio-pci/bind
echo "1002 aac8" > /sys/bus/pci/drivers/vfio-pci/remove_id

set +x

Actual Results: 
System hangs on "echo "0000:01:00.0" >
/sys/bus/pci/devices/0000:01:00.0/driver/unbind"

Journalctl shows "Apr 09 16:10:26 joey-arch-pc kernel: radeon 0000:01:00.0:
Userspace still has active objects !" followed by numerous "Apr 09 16:10:26
joey-arch-pc kernel: trying to unbind memory from uninitialized GART !"

Expected Results: 

The GPU should be unbinding from radeon and rebinding to vfio-pci without
hanging. 

Additional information:
I experienced the same issue on 4.1.20-1. 

I know of instances where the same script results in the expected outcome with
a Cayman PRO graphics card. 

Attached is the output of journalctl for the entire boot. Go to 16:10:26 to see
relevant call traces.

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