[Bug 101575] Lockup for executing trivial-tess-gs_no-gs-inputs.shader_test

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101575

            Bug ID: 101575
           Summary: Lockup for executing
                    trivial-tess-gs_no-gs-inputs.shader_test
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: Hi-Angel at yandex.ru
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 132214
  --> https://bugs.freedesktop.org/attachment.cgi?id=132214&action=edit
Vertex, geometric, pixel shaders dump

This test always fails:

        $ bin/shader_runner
piglit/tests/spec/arb_tessellation_shader/execution/trivial-tess-gs_no-gs-inputs.shader_test
-auto -fbo
        Probe color at (0,0)
          Expected: 0 255 0 0
          Observed: 0 0 0 0
        Test failure on line 60
        PIGLIT: {"result": "fail" }

but, in addition, often screen goes black, and kernel spews a message about
lockup:

        [ 4093.695956] radeon 0000:01:00.0: ring 3 stalled for more than
10053msec
        [ 4093.695966] radeon 0000:01:00.0: GPU lockup (current fence id
0x00000000000002be last fence id 0x00000000000002bf on ring 3)
        [ 4093.696032] radeon 0000:01:00.0: failed to get a new IB (-35)
        [ 4093.696079] [drm:radeon_cs_ioctl [radeon]] *ERROR* Failed to get ib
!
        [ 4093.703389] radeon 0000:01:00.0: Saved 1154 dwords of commands on
ring 0.
        [ 4093.703406] radeon 0000:01:00.0: GPU softreset: 0x0000001D
        [ 4093.703410] radeon 0000:01:00.0:   GRBM_STATUS               =
0xA0631CA0
        [ 4093.703413] radeon 0000:01:00.0:   GRBM_STATUS_SE0           =
0x18000003
        [ 4093.703416] radeon 0000:01:00.0:   GRBM_STATUS_SE1           =
0x00000007
        [ 4093.703418] radeon 0000:01:00.0:   SRBM_STATUS               =
0x200000C0
        [ 4093.703421] radeon 0000:01:00.0:   SRBM_STATUS2              =
0x00000000
        [ 4093.703424] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 =
0x01000000
        [ 4093.703427] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 =
0x00011000
        [ 4093.703430] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     =
0x00068402
        [ 4093.703433] radeon 0000:01:00.0:   R_008680_CP_STAT          =
0x80870243
        [ 4093.703436] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   =
0x44483106
        [ 4093.708782] radeon 0000:01:00.0: GRBM_SOFT_RESET=0x00007F6B
        [ 4093.708836] radeon 0000:01:00.0: SRBM_SOFT_RESET=0x00100100
        [ 4093.710004] radeon 0000:01:00.0:   GRBM_STATUS               =
0x00003828
        [ 4093.710006] radeon 0000:01:00.0:   GRBM_STATUS_SE0           =
0x00000007
        [ 4093.710008] radeon 0000:01:00.0:   GRBM_STATUS_SE1           =
0x00000007
        [ 4093.710010] radeon 0000:01:00.0:   SRBM_STATUS               =
0x200000C0
        [ 4093.710012] radeon 0000:01:00.0:   SRBM_STATUS2              =
0x00000000
        [ 4093.710014] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 =
0x00000000
        [ 4093.710015] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 =
0x00000000
        [ 4093.710017] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     =
0x00000000
        [ 4093.710019] radeon 0000:01:00.0:   R_008680_CP_STAT          =
0x00000000
        [ 4093.710021] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   =
0x44C83D57
        [ 4093.710039] radeon 0000:01:00.0: GPU reset succeeded, trying to
resume
        [ 4093.737953] [drm] PCIE GART of 1024M enabled (table at
0x000000000014C000).
        [ 4093.738076] radeon 0000:01:00.0: WB enabled
        [ 4093.738081] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr
0x0000000040000c00 and cpu addr 0xffff8801b0eb0c00
        [ 4093.738084] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr
0x0000000040000c0c and cpu addr 0xffff8801b0eb0c0c
        [ 4093.738460] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr
0x000000000005c418 and cpu addr 0xffffc9000181c418
        [ 4093.755220] [drm] ring test on 0 succeeded in 1 usecs
        [ 4093.755229] [drm] ring test on 3 succeeded in 3 usecs
        [ 4093.932873] [drm] ring test on 5 succeeded in 1 usecs
        [ 4093.932878] [drm] UVD initialized successfully.
        [ 4093.951552] [drm] ib test on ring 0 succeeded in 0 usecs
        [ 4093.951589] [drm] ib test on ring 3 succeeded in 0 usecs
        [ 4095.109237] [drm] ib test on ring 5 succeeded

≈½ of lockups are leaving screen black, and require reboot.

Attaching vs,gs,ps assembly, and R600_TRACE results from 2 different lockups.
The 2 traces are identical except that 1-st one locks up at the start, and the
other at the end.

I've tried fixing it myself, but I have no slightest idea what to look at.

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