[Bug 100143] New: i915 4.11.0-rc1 circular locking dependency detected, switcheroo-cont/776 is trying to acquire lock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100143

            Bug ID: 100143
           Summary: i915 4.11.0-rc1 circular locking dependency detected,
                    switcheroo-cont/776 is trying to acquire lock
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: bugzilla at colorremedies.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 130151
  --> https://bugs.freedesktop.org/attachment.cgi?id=130151&action=edit
journal konly 4.11.0-rc1+debug drm.debug=0x1e

During boot, an INFO message pops up shortly after switcheroo-control.service
is started.


BOOT_IMAGE=/vmlinuz-4.11.0-0.rc1.git0.1.fc26.x86_64+debug
root=UUID=15910530-9840-49af-b948-34eb9599442e ro rootflags=subvol=root00
elevator=deadline drm.debug=0x1e enforcing=0

[    7.670365] localhost.localdomain kernel: snd_hda_intel 0000:01:00.1:
Disabling via vga_switcheroo
[    7.673522] localhost.localdomain kernel: 
[    7.673522] localhost.localdomain kernel:
======================================================
[    7.673523] localhost.localdomain kernel: [ INFO: possible circular locking
dependency detected ]
[    7.673524] localhost.localdomain kernel:
4.11.0-0.rc1.git0.1.fc26.x86_64+debug #1 Not tainted
[    7.673525] localhost.localdomain kernel:
-------------------------------------------------------
[    7.673525] localhost.localdomain kernel: switcheroo-cont/776 is trying to
acquire lock:
[    7.673526] localhost.localdomain kernel:  (console_lock){+.+.+.}, at:
[<ffffffffba631389>] vga_switchto_stage2+0x99/0x130
[    7.673532] localhost.localdomain kernel: 
                                             but task is already holding lock:
[    7.673532] localhost.localdomain kernel:  (vgasr_mutex){+.+.+.}, at:
[<ffffffffba631a4a>] vga_switcheroo_debugfs_write+0x8a/0x3f0
[    7.673535] localhost.localdomain kernel: 
                                             which lock already depends on the
new lock.

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