https://bugs.freedesktop.org/show_bug.cgi?id=100424

            Bug ID: 100424
           Summary: X hang (in kernel) after some event in Serious Sam
                    Fusion using radv. 4.9/and-staging-4.9
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: bugspam@moreofthesa.me.uk

To reproduce, play Serious Sam Fusion (Vulkan rendering). X should freeze after
a few minutes; at the start of SS:TFE, venturing out into the desert or killing
an gnaar should be enough to trigger it.

It looks like a fence + buffer object 'interaction'.

This appears to affect all Linux 4.9.x and amd-staging-4.9; other kernels are
as yet untested.

Mesa 17.0.2 or git, libdrm 2.4.75, llvm 4.0~svn294803. Hardware is RX 470.

Sample backtrace:

[  861.398271] INFO: task Xorg:4985 blocked for more than 120 seconds.
[  861.398292]       Tainted: G         C O    4.9.17+dc+ #1
[  861.398301] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[  861.398306] Xorg            D    0  4985   4966 0x00000004
[  861.398317]  ffff88040d4037c8 ffff880409bc9480 ffff88041c9ca1c0
ffff88041ed96440
[  861.398339]  ffff88040d403340 ffffc9000acc3a70 ffffffff8155de4e
0000000000000002
[  861.398356]  ffff88040d403340 ffff880405ab1500 ffff880405ab1500
0000000000000001
[  861.398377] Call Trace:
[  861.398391]  [<ffffffff8155de4e>] ? __schedule+0x228/0x3bd
[  861.398400]  [<ffffffff8155e067>] schedule+0x84/0x98
[  861.398409]  [<ffffffff813194d5>] amd_sched_entity_push_job+0x69/0x86
[  861.398417]  [<ffffffff81059623>] ? __wake_up_sync+0xd/0xd
[  861.398425]  [<ffffffff81319c85>] amdgpu_job_submit+0x71/0x7f
[  861.398434]  [<ffffffff812dff16>] amdgpu_vm_bo_split_mapping+0x3df/0x47a
[  861.398443]  [<ffffffff812df742>] ? amdgpu_vm_adjust_mc_addr+0x1f/0x1f
[  861.398461]  [<ffffffff812e0f37>] amdgpu_vm_bo_update+0x17d/0x222
[  861.398472]  [<ffffffff812d5d41>] amdgpu_gem_va_ioctl+0x362/0x3d9
[  861.398486]  [<ffffffff812d4fed>] ? ttm_bo_unreserve+0x40/0x43
[  861.398495]  [<ffffffff8129859c>] ? drm_gem_handle_create+0x34/0x39
[  861.398503]  [<ffffffff81298ccc>] drm_ioctl+0x26c/0x38b
[  861.398510]  [<ffffffff81298ccc>] ? drm_ioctl+0x26c/0x38b
[  861.398516]  [<ffffffff812d59df>] ? amdgpu_gem_metadata_ioctl+0xe8/0xe8
[  861.398525]  [<ffffffff8104b554>] ? preempt_latency_start+0x21/0x5d
[  861.398532]  [<ffffffff8104b5f2>] ? preempt_count_add+0x62/0x65
[  861.398540]  [<ffffffff81560846>] ? _raw_spin_unlock_irqrestore+0x13/0x25
[  861.398549]  [<ffffffff812c1d17>] amdgpu_drm_ioctl+0x4a/0x7a
[  861.398557]  [<ffffffff810dbdbd>] vfs_ioctl+0x13/0x2f
[  861.398564]  [<ffffffff810dc2d0>] do_vfs_ioctl+0x47f/0x524
[  861.398573]  [<ffffffff810e48a3>] ? __fget+0x66/0x72
[  861.398581]  [<ffffffff810dc3b3>] SyS_ioctl+0x3e/0x5c
[  861.398588]  [<ffffffff81560be4>] entry_SYSCALL_64_fastpath+0x17/0x98
[  861.398654] INFO: task Sam2017:6271 blocked for more than 120 seconds.
[  861.398660]       Tainted: G         C O    4.9.17+dc+ #1
[  861.398664] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[  861.398669] Sam2017         D    0  6271   6270 0x00000000
[  861.398762]  ffff8803902caa08 ffff88040d0d1800 ffffffff81c0c500
ffff88041ec16440
[  861.398778]  ffff8803902ca580 ffffc90002cdba78 ffffffff8155de4e
0000000000000002
[  861.398796]  ffff8803902ca580 7fffffffffffffff 0000000000000246
ffff88033dd3e100
[  861.398812] Call Trace:
[  861.398821]  [<ffffffff8155de4e>] ? __schedule+0x228/0x3bd
[  861.398829]  [<ffffffff8155e067>] schedule+0x84/0x98
[  861.398835]  [<ffffffff8155fdc5>] schedule_timeout+0x2f/0xf5
[  861.398843]  [<ffffffff8104b554>] ? preempt_latency_start+0x21/0x5d
[  861.398850]  [<ffffffff8104b5f2>] ? preempt_count_add+0x62/0x65
[  861.398857]  [<ffffffff813ae57a>] fence_default_wait+0x124/0x1c1
[  861.398863]  [<ffffffff813ae57a>] ? fence_default_wait+0x124/0x1c1
[  861.398869]  [<ffffffff813adf22>] ? fence_release+0x2b/0x2b
[  861.398875]  [<ffffffff813adee1>] fence_wait_timeout+0x2e/0x30
[  861.398881]  [<ffffffff812e4005>] amdgpu_ctx_add_fence+0x66/0x13b
[  861.398887]  [<ffffffff812d81b4>] amdgpu_cs_ioctl+0x1132/0x116a
[  861.398897]  [<ffffffff81298ccc>] drm_ioctl+0x26c/0x38b
[  861.398903]  [<ffffffff812d7082>] ? amdgpu_cs_find_mapping+0x7d/0x7d
[  861.398910]  [<ffffffff8104b554>] ? preempt_latency_start+0x21/0x5d
[  861.398917]  [<ffffffff8104b5f2>] ? preempt_count_add+0x62/0x65
[  861.398923]  [<ffffffff81560846>] ? _raw_spin_unlock_irqrestore+0x13/0x25
[  861.398931]  [<ffffffff812c1d17>] amdgpu_drm_ioctl+0x4a/0x7a
[  861.398938]  [<ffffffff810dbdbd>] vfs_ioctl+0x13/0x2f
[  861.398944]  [<ffffffff810dc2d0>] do_vfs_ioctl+0x47f/0x524
[  861.398951]  [<ffffffff810e48a3>] ? __fget+0x66/0x72
[  861.398958]  [<ffffffff810dc3b3>] SyS_ioctl+0x3e/0x5c
[  861.398965]  [<ffffffff81560be4>] entry_SYSCALL_64_fastpath+0x17/0x98

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