[Bug 85828] New: [IVB]igt gem_caching doesn't exit /sys/kernel/debug/dri/0/clients

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85828

            Bug ID: 85828
           Summary: [IVB]igt gem_caching doesn't exit
                    /sys/kernel/debug/dri/0/clients
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 108868
  --> https://bugs.freedesktop.org/attachment.cgi?id=108868&action=edit
run log

==System Environment==
--------------------------
Regression: not sure 
Non-working platforms: IVB

==kernel==
--------------------------
drm-intel-nightly/203b34bf78a127a85cf89bbd8cf4decd935d780f

==Bug detailed description==
Run automation testing, run gem_basic_create-fd-close then run
gem_caching_reads, it doesn't exit /sys/kernel/debug/dri/0/clients. 
Run it 5 cycles manually, I can't reproduce this issue.

/sys/kernel/debug/dri/0/clients   
          command   pid dev master a   uid      magic
         gem_caching  8043   0   y    y     0          0
         gem_caching  8043   0   n    y     0          0

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