[Bug 205309] New: kmemleak reports various leaks in amdgpu

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https://bugzilla.kernel.org/show_bug.cgi?id=205309

            Bug ID: 205309
           Summary: kmemleak reports various leaks in amdgpu
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4-rc4
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@xxxxxxxxxxxxxxxxxxxx
          Reporter: erhard_f@xxxxxxxxxxx
        Regression: No

Created attachment 285635
  --> https://bugzilla.kernel.org/attachment.cgi?id=285635&action=edit
kmemleak: 34 new suspected memory leaks

Running X I get various kmemleak dumps for amdgpu:
[...]
unreferenced object 0xffff995f56fde340 (size 224):
  comm "Xorg", pid 801, jiffies 4294890593 (age 1572.594s)
  hex dump (first 32 bytes):
    d0 e3 fd 56 5f 99 ff ff a0 61 7e c0 ff ff ff ff  ...V_....a~.....
    36 bb 4b 81 0a 00 00 00 48 fe 32 53 5f 99 ff ff  6.K.....H.2S_...
  backtrace:
    [<00000000531b3f80>] drm_sched_fence_create+0x1d/0xc0 [gpu_sched]
    [<00000000dc85bf8c>] drm_sched_job_init+0x5b/0xa0 [gpu_sched]
    [<000000005789f820>] amdgpu_job_submit+0x1e/0x90 [amdgpu]
    [<00000000f3185640>] amdgpu_copy_buffer+0x1ab/0x290 [amdgpu]
    [<0000000053449562>] amdgpu_ttm_copy_mem_to_mem+0x25d/0x520 [amdgpu]
    [<00000000810db067>] amdgpu_move_blit.constprop.25+0x85/0x1b0 [amdgpu]
    [<0000000051e06c3a>] amdgpu_bo_move+0x164/0x290 [amdgpu]
    [<00000000d0345de4>] ttm_bo_handle_move_mem+0x113/0x5b0 [ttm]
    [<000000003dbb02d9>] ttm_bo_validate+0x16e/0x1b0 [ttm]
    [<0000000096a41e6b>] amdgpu_bo_fault_reserve_notify+0xe5/0x130 [amdgpu]
    [<00000000eb688629>] ttm_bo_vm_fault+0xac/0x650 [ttm]
    [<0000000061352dd3>] __do_fault+0x31/0xf0
    [<00000000ad4b517c>] __handle_mm_fault+0xd31/0x12a0
    [<00000000037720cd>] handle_mm_fault+0x165/0x2e0
    [<00000000196e733c>] __do_page_fault+0x1a8/0x420
    [<000000000c9cfffa>] page_fault+0x31/0x40
[...]

System:    Kernel: 5.4.0-rc4 x86_64 bits: 64 Desktop: MATE 1.22.0 Distro:
Gentoo Base System release 2.6 
Machine:   Type: Server Mobo: Supermicro model: H8SGL v: 1234567890 serial:
<filter> BIOS: American Megatrends v: 3.5b 
           date: 03/18/2016 
CPU:       8-Core: AMD Opteron 6380 type: MT MCP speed: 1584 MHz min/max:
1400/2500 MHz 
Graphics:  Device-1: Advanced Micro Devices [AMD/ATI] Ellesmere [Radeon RX
470/480/570/570X/580/580X/590] driver: amdgpu 
           v: kernel 
           Device-2: Matrox Systems MGA G200eW WPCM450 driver: N/A 
           Display: x11 server: X.Org 1.20.5 driver: amdgpu,ati unloaded:
modesetting,radeon resolution: 1920x1080~60Hz 
           OpenGL: renderer: Radeon RX 590 Series (POLARIS10 DRM 3.35.0
5.4.0-rc4 LLVM 8.0.1) v: 4.5 Mesa 19.1.7

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