[Bug 81656] New: [BDW]Piglit spec_glsl-1.50_execution_geometry_max-input-components sporadically fail and causes WARNING drivers/gpu/drm/i915/intel_uncore.c:528 hsw_unclaimed_reg_debug.isra.11+0x6c/0x7e

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81656

          Priority: medium
            Bug ID: 81656
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW]Piglit
                    spec_glsl-1.50_execution_geometry_max-input-components
                    sporadically fail and causes WARNING
                    drivers/gpu/drm/i915/intel_uncore.c:528
                    hsw_unclaimed_reg_debug.isra.11+0x6c/0x7e
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 103314
  --> https://bugs.freedesktop.org/attachment.cgi?id=103314&action=edit
dmesg

System Environment:
--------------------------
Platform: BDW 
Libdrm:       
(master)libdrm-2.4.54-19-gc0b34dca2632a774249cfa3b969c3f7ce9df33e1
Mesa:        (master)9548ba6e7bb8e631f6ef6236f7425725239742fe
Xserver:   
(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel:(master)2.99.912-248-gbfccacf745d054756661be3edd8898ac6aceb878
Libva:    (master)3fddb7f937df4e0e15391bd65ae3c7552ea5b3d7
Libva_intel_driver:(master)c5cb17ea86f0065a939d3636dd26651c93d497c8
Kernel:   (drm-intel-nightly)d62845db2ec40e15a76e5d5ebfe1a039ea2538c4

Bug detailed description:
---------------------------
It fails on BDW with -nightly and -queued kernel. On -fixes kernel, It also
fails, but does not report WARNING.
It happens 3 in 5 runs. If this fail appears, it will impact other Piglit
cases.

output:
WARNING: May need to implement a temporary workaround: GS Number of URB Entries
must be less than or equal to the GS Maximum Number of Threads.
Probe color at (0,0)
  Expected: 0.000000 1.000000 0.000000 1.000000
  Observed: 0.000000 0.000000 0.000000 0.000000
PIGLIT: {"result": "fail" }

dmesg(add i915.mmio_debug=1)
[   40.195585] WARNING: CPU: 1 PID: 0 at
drivers/gpu/drm/i915/intel_uncore.c:528
hsw_unclaimed_reg_debug.isra.11+0x6c/0x7e [i915]()
[   40.195587] Unclaimed register detected after reading register 0x4400c
[   40.195589] Modules linked in: dm_mod iTCO_wdt iTCO_vendor_support
snd_hda_codec_hdmi pcspkr snd_hda_intel snd_hda_controller snd_hda_codec
snd_hwdep snd_pcm i2c_i801 lpc_ich mfd_core snd_timer snd soundcore ppdev
battery parport_pc parport ac acpi_cpufreq i915 button video drm_kms_helper drm
[   40.195611] CPU: 1 PID: 0 Comm: swapper/1 Not tainted
3.16.0-rc5_drm-intel-nightly_873440_20140720_debug+ #658
[   40.195612]  0000000000000009 ffff88014e443af8 ffffffff8182f83f
0000000000000046
[   40.195616]  ffff88014e443b48 ffff88014e443b38 ffffffff8103fa1c
ffff88014e443b88
[   40.195620]  ffffffffa00be1af ffff8800030b0060 ffff8800030b0000
ffff8800030b0068
[   40.195623] Call Trace:
[   40.195625]  <IRQ>  [<ffffffff8182f83f>] dump_stack+0x46/0x58
[   40.195634]  [<ffffffff8103fa1c>] warn_slowpath_common+0x81/0x9b
[   40.195652]  [<ffffffffa00be1af>] ?
hsw_unclaimed_reg_debug.isra.11+0x6c/0x7e [i915]
[   40.195655]  [<ffffffff8103fad9>] warn_slowpath_fmt+0x46/0x48
[   40.195673]  [<ffffffffa00be1af>] hsw_unclaimed_reg_debug.isra.11+0x6c/0x7e
[i915]
[   40.195688]  [<ffffffffa00be387>] gen6_read32+0xb0/0x116 [i915]
[   40.195704]  [<ffffffffa00a9be7>] i915_capture_error_state+0x296/0x12b3
[i915]
[   40.195708]  [<ffffffff81390b99>] ? vsnprintf+0x76/0x3c2
[   40.195723]  [<ffffffffa00b0b3a>] i915_handle_error+0x81/0x5c6 [i915]
[   40.195726]  [<ffffffff8182c13a>] ? printk+0x4d/0x4f
[   40.195742]  [<ffffffffa00b3296>] i915_hangcheck_elapsed+0x36e/0x38e [i915]
[   40.195755]  [<ffffffffa00b2f28>] ? cherryview_irq_handler+0xfa/0xfa [i915]
[   40.195760]  [<ffffffff81049f42>] call_timer_fn+0x97/0x15a
[   40.195763]  [<ffffffff81049eb0>] ? call_timer_fn+0x5/0x15a
[   40.195776]  [<ffffffffa00b2f28>] ? cherryview_irq_handler+0xfa/0xfa [i915]
[   40.195780]  [<ffffffff8104a4fd>] run_timer_softirq+0x1ed/0x252
[   40.195784]  [<ffffffff81043ad9>] __do_softirq+0x115/0x294
[   40.195788]  [<ffffffff81043e4b>] irq_exit+0x44/0x9a
[   40.195791]  [<ffffffff81839abb>] smp_apic_timer_interrupt+0x45/0x52
[   40.195795]  [<ffffffff8173188b>] ? cpuidle_enter_state+0x49/0xbd
[   40.195798]  [<ffffffff81837eef>] apic_timer_interrupt+0x6f/0x80
[   40.195799]  <EOI>  [<ffffffff8173188b>] ? cpuidle_enter_state+0x49/0xbd
[   40.195804]  [<ffffffff81731897>] ? cpuidle_enter_state+0x55/0xbd
[   40.195807]  [<ffffffff81731893>] ? cpuidle_enter_state+0x51/0xbd
[   40.195810]  [<ffffffff817319aa>] cpuidle_enter+0x17/0x19
[   40.195813]  [<ffffffff810779fe>] cpu_startup_entry+0x233/0x371
[   40.195818]  [<ffffffff81027bfc>] start_secondary+0x1c2/0x1c7
[   40.195820] ---[ end trace ec32987ce108221a ]---
[   40.195822] ------------[ cut here ]------------

Reproduce steps:
-------------------------
1. xinit
2. bin/shader_runner
tests/spec/glsl-1.50/execution/geometry/max-input-components.shader_test -auto

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