Bug 89882

Summary: [SKL]igt/kms_cursor_crc sporadically causes system hang
Product: DRI Reporter: lu hua <huax.lu>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: critical    
Priority: highest CC: intel-gfx-bugs
Version: unspecified   
Hardware: All   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
dmesg none

Description lu hua 2015-04-03 03:01:23 UTC 
Created attachment 114840 [details]
dmesg

System Environment:
--------------------------
Regression: not sure
Non-working platforms: SKL

==kernel==
--------------------------
drm-intel-nightly/d72ff1ab1499711c941831400629c14493313b3a
commit d72ff1ab1499711c941831400629c14493313b3a
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Tue Mar 31 17:30:12 2015 +0200

    drm-intel-nightly: 2015y-03m-31d-15h-29m-33s UTC integration manifest


==Bug detailed description==
-----------------------------
Run ./kms_cursor_crc --run-subtest cursor-256x256-onscreen on SKL-Y with -nightly kernel, it causes system hang at the 2nd round.

output:
IGT-Version: 1.10-g2f0e3cd (x86_64) (Linux: 4.0.0-rc6_drm-intel-nightly_d72ff1_2
Beginning cursor-256x256-onscreen on pipe A, connector eDP-1
............................
cursor-256x256-onscreen on pipe A, connector eDP-1: PASSED

Beginning cursor-256x256-onscreen on pipe B, connector eDP-1
............................
cursor-256x256-onscreen on pipe B, connector eDP-1: PASSED

Beginning cursor-256x256-onscreen on pipe C, connector eDP-1
............................
cursor-256x256-onscreen on pipe C, connector eDP-1: PASSED

Subtest cursor-256x256-onscreen: SUCCESS (29.165s)

real    0m29.859s
user    0m5.726s
sys     0m0.527s
root@x-skly05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time ./kms_cursor_crc --run-subtest cursor-256x256-onscreen
IGT-Version: 1.10-g2f0e3cd (x86_64) (Linux: 4.0.0-rc6_drm-intel-nightly_d72ff1_20150401+ x86_64)
Beginning cursor-256x256-onscreen on pipe A, connector eDP-1
.Warning on condition crc->crc[i] == 0xffffffff in fucntion crc_sanity_checks, file igt_debugfs.c:494
Suspicious CRC: it looks like the CRC read back was from a register in a powered down well

==Reproduce steps==
---------------------------- 
1. run ./kms_cursor_crc --run-subtest cursor-256x256-onscreen twice
Comment 1 Ander Conselvan de Oliveira 2015-04-28 07:27:41 UTC 
Could you provide the output of dmesg with drm.debug=0x1e leading to the hang?
Comment 2 Ander Conselvan de Oliveira 2015-05-04 12:12:49 UTC 
Looks like dmesg got truncated. There is no information between timestamps 41.756717] and 112.931420. It also doesn't have the "kms_cursor_crc: executing" line.

Could you give another try to get a complete dmesg?
Comment 3 lu hua 2015-05-05 08:24:20 UTC 
I run it more than 5 cycles on the latest drm-intel-nightly kernel, it works well. Close it.
Comment 4 lu hua 2015-05-05 08:24:58 UTC 
Verified.Fixed.
Comment 5 Elizabeth 2017-10-06 14:30:42 UTC 
Closing old verified.

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