[Bug 67243] [ILK]igt/kms_render/gpu-blit randomly causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67243

--- Comment #17 from Imre Deak <imre.deak at gmail.com> ---
Created attachment 85190
  --> https://bugs.freedesktop.org/attachment.cgi?id=85190&action=edit
debug ironlake_crtc_disable

(In reply to comment #16)
> Test patch 1, 1+2, 1+2+3, 1+2+3+4, 1+2+3+4+5, It still happens.

Thanks, that narrows it down to a:

fb = kmstest_create_fb2();
drmModeSetCrtc(fb);
kmstest_remove_fb(fb);

loop. And considering your dmesg that seems to point to somewhere in
ironlake_crtc_disable() when calling kmstest_remove_fb(). I attached a kernel
patch to add debug info to ironlake_crtc_disable().

I noticed only now that you are missing some useful debugging options from your
kernel .config, please enable them (and I suggest keeping them on for the
future too):

CONFIG_LOCKUP_DETECTOR
CONFIG_DETECT_HUNG_TASK
CONFIG_PROVE_LOCKING

Then please run the test again with all the disable patches 1-5 applied and the
attached kernel patch, and provide a new dmesg log (with drm.debug=0xf and
including everything starting from boot-up) and the output from the test.

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