Nouveau - Dec 2017 - [Bug 104340] New: Memory leak with GEM objects

https://bugs.freedesktop.org/show_bug.cgi?id=104340

            Bug ID: 104340
           Summary: Memory leak with GEM objects
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: sgilles at math.umd.edu
        QA Contact: xorg-team at lists.x.org

Created attachment 136291
  --> https://bugs.freedesktop.org/attachment.cgi?id=136291&action=edit
dmesg (up to last nouveau messages)

I have a gk106, current versions of libdrm, mesa, kernel (observed both with
-mainline and https://github.com/skeggsb/linux branch linux-4.15 as of a few
minutes ago), and there appears to be a memory leak with nouveau that eats up
about .5 GB every day. Killing X does nothing.

Attached is output of dmesg from the most recent boot of this machine. I've
also attached (in case it matters) dumps of /proc/meminfo and output of slabtop
after I ran X for about two weeks, then exited and killed all major daemons. 
More importantly, I've attached a few hundred lines of
/sys/kernel/debug/kmemleak (from the most recent boot). After the first few
entries, they all start looking the same (except for the address and age).

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--- Comment #1 from S. Gilles <sgilles at math.umd.edu> ---
Created attachment 136292
  --> https://bugs.freedesktop.org/attachment.cgi?id=136292&action=edit
first few lines of /sys/kernel/debug/kmemleak

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--- Comment #2 from S. Gilles <sgilles at math.umd.edu> ---
Created attachment 136294
  --> https://bugs.freedesktop.org/attachment.cgi?id=136294&action=edit
contents of /proc/meminfo after running X for a few weeks, then killing it

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--- Comment #3 from S. Gilles <sgilles at math.umd.edu> ---
Created attachment 136295
  --> https://bugs.freedesktop.org/attachment.cgi?id=136295&action=edit
output of slabtop after running X for a few weeks

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--- Comment #4 from Ben Skeggs <skeggsb at gmail.com> ---
I've pushed a fix for a rather stupid memory leak bug that's likely the
cause
of what you're seeing.

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S. Gilles <sgilles at math.umd.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from S. Gilles <sgilles at math.umd.edu> ---
This appears to fix it. I've been testing the fix for about 30 minutes, and
kmemleak is no longer complaining about X.  Thanks for looking into this!

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