[Bug 110276] New: Memory leak on kernel 5.0 using Vulkan applications, fixed on drm-tip and 5.1-rc1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110276

            Bug ID: 110276
           Summary: Memory leak on kernel 5.0 using Vulkan applications,
                    fixed on drm-tip and 5.1-rc1
           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: leozinho29_eu at hotmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 143800
  --> https://bugs.freedesktop.org/attachment.cgi?id=143800&action=edit
Video showing the 4 MB leak in 25 seconds

It was found that the kernel 5.0 has a memory leak when Vulkan applications are
used. It seems this leak can be even more intense than the one from bug 107899.

On drm-tip and linux-git, the commit 61a98b1b9a8c7a21a2d666a090dcf5f1c70c659f
fixes this leak. However, the leak is present on the kernel 5.0.5, currently
the latest stable.

vulkan-smoketest is enough to trigger the leak. On slabtop, it shows:

80275  80275 100%    0,62K   3211       25     51376K i915_request

Steps to reproduce:

1) Open a Vulkan application, for example, vulkan-smoketest.

System information:

OS: Xubuntu 18.04;
Kernel: 5.0.0-8 (Disco Dingo) to 5.0.5;
CPU: Intel Core i3-6100U;
GPU: Intel HD Graphics 520;
Memory: 8 GB.

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