[Bug 103178] [BAT] igt at kms_cursor_legacy@basic-flip-after-cursor-legacy - Incomplete

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103178

--- Comment #4 from Marta Löfstedt <marta.lofstedt at intel.com> ---
Note, data from:

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3196/fi-glk-1/dmesg-1507288911_Oops_1.log
<14>[  569.068084] [IGT] drv_module_reload: starting subtest basic-reload
...
<1>[  569.561140] BUG: unable to handle kernel NULL pointer dereference at
0000000000000028

should be ignorded.

So, this is a "plain" kernel BUG at drivers/gpu/drm/i915/intel_lrc.c:880!

hence it should be duplicate of BUG 103190, which is now duplicate of BUG
102035.
Also, quote from IRC 2017-10-11:


<marta_> dolphin, ickle : this on APL-shards there has now been 3 occurences of
kernel BUG at drivers/gpu/drm/i915/intel_lrc.c:880! in 7 CI runs. see bug:
https://bugs.freedesktop.org/show_bug.cgi?id=103190
<dolphin> marta_: does it happen to have IOMMU on, by any chance?
<dolphin> aka. Intel VT-d turned on from BIOS
* itoral (~itoral at fanzine.igalia.com) has joined
* danvet (~Daniel at 2a02:168:5635:0:39d2:f87e:2033:9f6) has joined
<dolphin> If you can try running "intel_iommu=off" instead of igfx_off, that'd
give a datapoint
* cristi (~majeru at 131.228.216.128) has joined
<dolphin> marta_: it's the same issue as with
https://bugs.freedesktop.org/show_bug.cgi?id=102035
<marta_> thanks dolphin I will dup
<marta_> tsa is dolphin suggestion ^^ something to test?
* xerpi (~xerpi at 59.red-88-23-235.staticip.rima-tde.net) has joined
<tsa> need to pick up one APL shard and check bios option / test kernel param
<tsa> looking at the 3206 missing htmls now\
* lemonzest (~lemonzest at unaffiliated/lemonzest) has joined
* [Enrico] (~chiccoroc at gentoo/contributor/Enrico) has joined
<dolphin> marta_: yep, double-checked it, there just have been additions to the
file
<dolphin> it may be more convenient for you guys to look at the actual line of
code in the file, when filing bug
<dolphin> this this case: GEM_BUG_ON(status & GEN8_CTX_STATUS_PREEMPTED);
<dolphin> so the bug could be best identified as
intel_lrc_irq_handler()/GEM_BUG_ON(status & GEN8_CTX_STATUS_PREEMPTED)
<dolphin> If we had not been having the same error before we added any
pre-emption code, one would think there's an error in the pre-emption code, but
it failed before

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