[Bug 119181] New: Hang in amdgpu_vm_bo_update_mapping with powerplay enabled

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=119181

            Bug ID: 119181
           Summary: Hang in amdgpu_vm_bo_update_mapping with powerplay
                    enabled
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.5.4
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: mustrumr97 at gmail.com
        Regression: No

Created attachment 218111
  --> https://bugzilla.kernel.org/attachment.cgi?id=218111&action=edit
Stack trace (sysrq-w)

This happens after a few minutes in a 3D-intensive workload (e.g. Kerbal Space
Program). The game hangs, but the mouse is moving. A few seconds later the
mouse stops moving.

1. The game is waiting on an ioctl (libdrm:
amdgpu_fence_wait/amdgpu_cs_query_fence_status)
2. Xorg is in D state (see attached stack trace).
3. CPU load at ~0%.
4. Nothing interesting in kernel log.

The kernel has voluntary preemption enabled, the GPU is 1002:6938 (AMD Radeon
380X). It is at 56°C, quickly drops down to 51 when forced to low performance
state, goes up to 56 when at auto.

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