Comment 0 for bug 1798165

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 <email address hidden>
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: <email address hidden>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107899
    Reviewed-by: Chris Wilson <email address hidden>
    Signed-off-by: Jason Ekstrand <email address hidden>
    Signed-off-by: Sean Paul <email address hidden>
    Link: https://patchwork.freedesktop<email address hidden>
    Signed-off-by: Greg Kroah-Hartman <email address hidden>

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