Bug 95632

This seems to be a somewhat recent addition to our list of fail :( Seems to have started with RO_CI_DRM_435. Can someone from RO CI investigate/run a bisect please?

@danvet: Ran BAT 3 times on on that machine (and two others), w/o triggering that err.

It looks like flip-flopping test to me.

From 435 to 438 kms_flip@basic-flip-vs-wf_vblank seems to trigger it more than once, but again can't reproduce.

Tried with:

commit fc9d741bc65b3eba8bdc51a668c202b39d81d833
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed May 25 09:46:14 2016 +0200

    drm-intel-nightly: 2016y-05m-25d-07h-45m-48s UTC integration manifest


(w/ Revert async unpin) commits. Wandering if it makes to go backwards (w/o that revert).

Nope, I spoke too soon:

Managed to trigger it with:

$ kms_psr_sink_crc --run-subtest psr_basic

(In reply to Marius Vlad from comment #3)
> Nope, I spoke too soon:
> 
> Managed to trigger it with:
> 
> $ kms_psr_sink_crc --run-subtest psr_basic

Which might support my theory that we could be losing the vblank interrupt with PSR and/or DC5/6. Can you reproduce w/o DC5/6?

I'm seeing a lot of messages likes this when running kms_flip test:

basic-flip-vs-wf_vblank

[  600.881610] DMAR: DRHD: handling fault status reg 3
[  600.881633] DMAR: [DMA Read] Request device [00:02.0] fault addr ff000000 [fault reason 06] PTE Read access is not set

I am also seeing this error message on my i7-4500U laptop and was able to bisect it to this commit:

92dcc67c11d51671cca8df543e25c601e52336ad is the first bad commit
commit 92dcc67c11d51671cca8df543e25c601e52336ad
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Thu Apr 28 09:56:46 2016 +0100

    drm/i915: Unify intel_ring_begin()
    
    Combine the near identical implementations of intel_logical_ring_begin()
    and intel_ring_begin() - the only difference is that the logical wait
    has to check for a matching ring (which is assumed by legacy).
    
    In the process some debug messages are culled as there were following a
    WARN if we hit an actual error.
    
    v2: Updated commentary
    
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
    Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
    Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
    Link: http://patchwork.freedesktop.org/patch/msgid/1461833819-3991-12-git-send-email-chris@chris-wilson.co.uk
    (cherry picked from commit 987046ad65361a8b038fbf8d76d152237fb7acf1)
    Signed-off-by: Jani Nikula <jani.nikula@intel.com>

@Marius Vlad, is this error still seen in CI tests? I am not able to reproduce it on a SKL that I have.

Created attachment 125895 [details]
attachment-9442-0.html

Hello,

I am out of office and I will be back on August 24th. For anything urgent, please contact my manager Paul Parenteau.

Thank you,
Daniela

I'm no longer seeing this error with 4.8.0-rc3 so this may have gotten fixed since then?

@Damien Grassart
I was not able to reproduce the issue. So, I am not sure if a specific fix went in.


@Tvrtko Ursulin, should we just close this? The recent CI results do not show failures.

I confirm, this is not reproducible on any platforms in CI. therefore closing it.

Fedora 26, kernel 4.11.9-300.fc26.x86_64

Kernel command line: BOOT_IMAGE=/vmlinuz-4.11.9-300.fc26.x86_64 root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rd.driver.blacklist=nouveau nouveau.modeset=0 rd.driver.blacklist=nouveau rd.driver.blacklist=psmouse i915.enable_guc_loading=1 i915.enable_guc_submission=1 intel_pstate=skylake_hwp i915.enable_psr=1 i915.disable_power_well=0 rhgb quiet

[    2.888511] [drm] Memory usable by graphics device = 4078M
[    2.888852] [drm] Replacing VGA console driver
[    2.895295] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    2.895297] [drm] Driver supports precise vblank timestamp query.
[    2.898397] [drm] Finished loading DMC firmware i915/skl_dmc_ver1_26.bin (v1.26)
[    2.934520] [drm] Initialized i915 1.6.0 20170123 for 0000:00:02.0 on minor 0
[    4.772712] [drm] RC6 on
[ 6590.721255] [drm] RC6 on

[10277.337948] [drm:intel_pipe_update_start [i915]] *ERROR* Potential atomic update failure on pipe A
[10280.952927] [drm:intel_pipe_update_start [i915]] *ERROR* Potential atomic update failure on pipe A
[10287.635894] [drm:intel_pipe_update_start [i915]] *ERROR* Potential atomic update failure on pipe A
[10288.339881] [drm:intel_pipe_update_start [i915]] *ERROR* Potential atomic update failure on pipe A
[10292.338868] [drm:intel_pipe_update_start [i915]] *ERROR* Potential atomic update failure on pipe A
[10315.588806] [drm:intel_pipe_update_start [i915]] *ERROR* Potential atomic update failure on pipe A

Base Board Information
        Manufacturer: Dell Inc.
        Product Name: 0M91XC
        Version: A00

BIOS Information
        Vendor: Dell Inc.
        Version: 1.12.4
        Release Date: 05/12/2017
        Address: 0xF0000
        Runtime Size: 64 kB
        ROM Size: 16 MB

Hello Arcadiy,
Could you please attach dmesg with drm.debug=0xe parameter on grub with latest kernel version on bug 91883 to follow up.
Thank you.

*** This bug has been marked as a duplicate of bug 91883 ***