Bug 107094

Summary: [CI] igt@drv_selftest@mock_scatterlist - dmesg-warn - sg_alloc_table timed out (leading to an incomplete)
Product: DRI Reporter: Martin Peres <martin.peres>
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: normal    
Priority: medium CC: intel-gfx-bugs, tomi.p.sarvela
Version: XOrg git   
Hardware: Other   
OS: All   
Whiteboard: ReadyForDev
i915 platform: GLK i915 features: GEM/Other

Description Martin Peres 2018-07-02 23:06:50 UTC 
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4416/shard-glk9/igt@drv_selftest@mock_scatterlist.html

[   64.987070] Setting dangerous option mock_selftests - tainting kernel
[   66.016029] sg_alloc_table timed out
[   67.017005] i915_sg_trim timed out


This then leads to an incomplete: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4415/shard-glk9/igt@drv_selftest@live_gtt.html
Comment 1 Martin Peres 2018-07-02 23:07:48 UTC 
This is only seen on shard-glk9. Adding Tomi so as we can know what is different about this machine.
Comment 2 Tomi Sarvela 2018-07-03 07:21:27 UTC 
shard-glk9 is production hardware and has same BIOS version and same amount of RAM as any other shard-glks.

Any ideas what this could be about?
Comment 3 Chris Wilson 2018-07-03 08:05:48 UTC 
What's unusual here? mock_scatterlist is CI's false positive as it erroneously thinks a pr_note is a warning, and the live_gtt is just CI declaring the system hung before the test is able to complete (too low a threshold on the hung task watchdog -- don't use the hung task watchdog, hard lockup definitely, soft lockup is debatable so needs a relaxed timeout, hung task has too many false positives).
Comment 4 Chris Wilson 2018-07-14 17:42:24 UTC 
I do think this was conflating two known bugs. As we've taken measures to reduce the amount of memory used for live_gtt, let's sweep this under the carpet.
Comment 5 Martin Peres 2018-07-20 10:41:49 UTC 
It indeed got fixed :)

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