[Bug 88301] Dota causes GPU fault and kernel hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88301

            Bug ID: 88301
           Summary: Dota causes GPU fault and kernel hang
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: tilman at code-monkey.de

I've got an apitrace of Dota that reliably causes GPU faults on radeonsi on my
Bonaire XTX.

The trace: http://files.code-monkey.de/dota.trace (468797931 bytes).

I'm running Mesa from master (8d2542fc9d5af4db355b67cc2a1ff2f413685a27) and can
reproduce the problem with kernel 3.18.2 and 3.19.0-rc2 (built from airlied's
drm-fixes tree; 79305ec6e60d320832505e95c1a028d309fcd2b6).
agd5f's "fix VM flush" patches from 2015-01-06 don't help either.

Example kernel log excerpt:
radeon 0000:01:00.0: GPU fault detected: 147 0x000c4801
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x01000000
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0C048001
VM fault (0x01, vmid 6) at page 16777216, read from 'TC2' (0x54433200) (72)
radeon 0000:01:00.0: GPU fault detected: 146 0x000c080c
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_ADDR   0x00000000
radeon 0000:01:00.0:   VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0C00800C
VM fault (0x0c, vmid 6) at page 0, read from 'TC0' (0x54433000) (8)

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