[Bug 70523] New: "[ NFO: possible circular locking dependency detected ]" when running module_reload

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70523

          Priority: high
            Bug ID: 70523
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: "[ NFO: possible circular locking dependency detected
                    ]" when running module_reload
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: xunx.fang at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 87716
  --> https://bugs.freedesktop.org/attachment.cgi?id=87716&action=edit
dmesg

System Environment:
--------------------------
Platform: Ivybridge
Kernel:         (drm-intel-fixes) cd66407810869709e0d6764409137d48c6812cfc

Bug detailed description:
-----------------------------
Start system with next-queued or next-fixed debug_build kernel, then run
module_reload, you will see "[ INFO: possible circular locking dependency
detected ]" in dmesg. It happens on next-queued and next-fixed branch.
I try to bisect, but find it also exists in kernel 3.9.0-rc6.

Reproduce steps:
---------------------------
1. start system with debug kernel
2  ./module_reload
2. see dmesg

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