[Bug 60534] New: i915 deadlock related to lock(&dev->struct_mutex);

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60534

            Bug ID: 60534
           Summary: i915 deadlock related to lock(&dev->struct_mutex);
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.10-rc7 plus patches
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: patrakov at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 106845
  --> https://bugzilla.kernel.org/attachment.cgi?id=106845&action=edit
Dmesg illustrating the problem

I have a 3.10-rc7 kernel plus radeon-related patches from branch
'drm-next-3.11-wip-4' of git://people.freedesktop.org/~agd5f/linux

My laptop has both an Intel graphics chip in itself and a Radeon chip in a
hot-pluggable dock station. Both graphics cards have usable outputs. So I was
playing with xrandr --setprovideroffloadsink and --setprovideroutputsource. By
doing so, I was able to cause a deadlock in the i915 driver. I am going to
attach a dmesg that illustrates it.

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