[Bug 94759] New: [BAT BSW] lockdep splat in drm_gem_mmap

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94759

            Bug ID: 94759
           Summary: [BAT BSW] lockdep splat in drm_gem_mmap
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: joonas.lahtinen at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 122637
  --> https://bugs.freedesktop.org/attachment.cgi?id=122637&action=edit
dmesg from I-G-T run

At:
/archive/results/CI_IGT_test/Patchwork_1712/bsw-nuc-2/html/bsw-nuc-2 at Patchwork_1712@1/igt at gem_exec_basic@gtt-blt.html

Log beginning (full log attached):
[  149.921578] ======================================================
[  149.921640] [ INFO: possible circular locking dependency detected ]
[  149.921703] 4.5.0-gfxbench+ #1 Not tainted
[  149.921745] -------------------------------------------------------
[  149.921807] gem_exec_basic/5896 is trying to acquire lock:
[  149.921861]  (&dev->struct_mutex){+.+.+.}, at: [<ffffffff81514ea1>]
drm_gem_mmap+0x1a1/0x270
[  149.921969] 
but task is already holding lock:
[  149.922027]  (&mm->mmap_sem){++++++}, at: [<ffffffff8117d8c4>]
vm_mmap_pgoff+0x44/0xa0
[  149.922125] 
which lock already depends on the new lock.

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