[Bug 1798165]

*** Bug 108456 has been marked as a duplicate of this bug. ***

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https://bugs.launchpad.net/bugs/1798165

Title:
Vulkan applications cause permanent memory leak with Intel GPU

Status in Linux:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux source package in Cosmic:
Fix Released

Bug description:

== SRU Justification ==
Vulkan applications, as Dota 2 and DXVK games cause a memory leak where
memory is never freed and can cause a system crash if the applications are
used for long enough. Certain applications can make the leak be as high as
10 MB/minute.

This commit has been cc'd to upstream stable, but it has not landed in
Bionic or Cosmic as of yet.

Details about the upstream bug can be seen at:
https://github.com/doitsujin/dxvk/issues/632
https://bugs.freedesktop.org/show_bug.cgi?id=107899

== Fix ==
337fe9f5c1e7 ("drm/syncobj: Don't leak fences when WAIT_FOR_SUBMIT is set")

== Regression Potential ==
Low. This commit has been cc'd to stable, so it has had additional
upstream review.

== Test Case ==
A test kernel was built with this patch and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.


Vulkan applications, as Dota 2 and DXVK games cause a memory leak
where memory is never freed and can cause a system crash if the
applications are used for long enough. Certain applications can make
the leak be as high as 10 MB/minute.

Details about this bug can be seen at
https://github.com/doitsujin/dxvk/issues/632 and
https://bugs.freedesktop.org/show_bug.cgi?id=107899

This bug was fixed in 4.19-rc6 and was backported to 4.14 and 4.18.
The particular commit is:

commit a2cef7d049f07995406b403605119a54881daf15
Author: Jason Ekstrand <jason@jlekstrand.net>
Date: Wed Sep 26 02:17:03 2018 -0500

    drm/syncobj: Don't leak fences when WAIT_FOR_SUBMIT is set

    commit 337fe9f5c1e7de1f391c6a692531379d2aa2ee11 upstream.

    We attempt to get fences earlier in the hopes that everything will
    already have fences and no callbacks will be needed. If we do succeed
    in getting a fence, getting one a second time will result in a duplicate
    ref with no unref. This is causing memory leaks in Vulkan applications
    that create a lot of fences; playing for a few hours can, apparently,
    bring down the system.

    Cc: stable@vger.kernel.org
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107899
    Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
    Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
    Signed-off-by: Sean Paul <seanpaul@chromium.org>
    Link: https://patchwork.freedesktop.org/patch/msgid/20180926071703.15257-1-jason.ekstrand@intel.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

On Ubuntu 18.04 with 4.15.0-36 it appears in slabtop as:
https://i.imgur.com/qMAvuwl.png

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-36-generic 4.15.0-36.39
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: usuario 4655 F.... pulseaudio
 /dev/snd/seq: usuario 4640 F.... timidity
CurrentDesktop: XFCE
Date: Tue Oct 16 14:16:54 2018
HibernationDevice: RESUME=UUID=0946602f-3ca2-4379-9012-7a5171928de7
InstallationDate: Installed on 2017-06-13 (489 days ago)
InstallationMedia: Xubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: LENOVO 80UG
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-36-generic root=UUID=6b4ae5c0-c78c-49a6-a1ba-029192618a7a ro quiet ro kvm.ignore_msrs=1 kvm.halt_poll_ns=0 kvm.halt_poll_ns_grow=0 intel_iommu=on iommu=pt i915.enable_gvt=1 i915.fastboot=1 resume=UUID=0946602f-3ca2-4379-9012-7a5171928de7 mtrr_gran_size=2M mtrr_chunk_size=64M cgroup_enable=memory swapaccount=1 zswap.enabled=1 log_buf_len=16M usbhid.quirks=0x0079:0x0006:0x100000
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-36-generic N/A
 linux-backports-modules-4.15.0-36-generic N/A
 linux-firmware 1.173.1
SourcePackage: linux
UpgradeStatus: Upgraded to bionic on 2017-10-20 (361 days ago)
dmi.bios.date: 08/09/2018
dmi.bios.vendor: LENOVO
dmi.bios.version: 0XCN45WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: Toronto 4A2
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40679 WIN
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo ideapad 310-14ISK
dmi.modalias: dmi:bvnLENOVO:bvr0XCN45WW:bd08/09/2018:svnLENOVO:pn80UG:pvrLenovoideapad310-14ISK:rvnLENOVO:rnToronto4A2:rvrSDK0J40679WIN:cvnLENOVO:ct10:cvrLenovoideapad310-14ISK:
dmi.product.family: IDEAPAD
dmi.product.name: 80UG
dmi.product.version: Lenovo ideapad 310-14ISK
dmi.sys.vendor: LENOVO

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