[Bug 92303] [radeonsi] Buffer sharing (with/without IOMMU) locks up GPU display with dGPU only

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92303

            Bug ID: 92303
           Summary: [radeonsi] Buffer sharing (with/without IOMMU) locks
                    up GPU display with dGPU only
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: shawn.starr at rogers.com

Kernel: 4.3.0-0.rc3.git3.2.fc24.x86_64
Mesa: git master (mesa-libGL-11.0.0-0.devel.70.20150926.fc22.x86_64)
libdrm: (Sept 16th build)

kernel command line: 
BOOT_IMAGE=/boot/vmlinuz-4.3.0-0.rc3.git3.2.fc24.x86_64
root=UUID=f834b05c-55f3-407b-9a63-fc6b04d4c845 ro rhgb slub_debug=-
cgroup_disable=memory console=tty0 console=ttyS0,115200n8 nmi_watchdog=0
i915.powersave=1 intel_iommu=igfx_off
vfio_iommu_type1.allow_unsafe_interrupts=1 zswap.zpool=zsmalloc zswap.enabled=1
video=LVDS-1:d video=VGA-0:e pcie_aspm=off i915.enable_rc6=1 i915.enable_fbc=1
intel_iommu=on audit=0 rd.driver.blacklist=amdgpu radeon.gartsize=8192
intel_iommu=off

When trying to play ARK with high level graphics options, GPU fails to recover
on reset, setting GART to 2048 or 8192 results in same fault. If I keep
graphics - textures - to high vs ultimate, the game works.

I've attached various logs from the fault.

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