[igt-dev] [PATCH i-g-t v2] tests/kms_flip: improve logging when timing out

Simon Ser

author

2019-06-17 12:56 UTC #0 lore raw

PATCH v2 1/1 tests/kms_flip: improve logging when timing out

Signed-off-by Simon Ser <[email protected]>

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105363
---

v2: clarify log message

 tests/kms_flip.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

tests/kms_flip.c +5 -2

index 2a158d97bbec..6eadb71b3ed9 100755
@@ -686,14 +686,17 @@ static unsigned int run_test_step(struct test_output *o)
 	    !(o->pending_events & EVENT_VBLANK) && o->flip_state.count > 0) {
 		struct vblank_reply reply;
 		unsigned int exp_seq;
-		unsigned long start;
+		unsigned long start, end;
 
 		exp_seq = o->flip_state.current_seq;
 		start = gettime_us();
 		do_or_die(__wait_for_vblank(TEST_VBLANK_ABSOLUTE |
 					    TEST_VBLANK_BLOCK, o->pipe, exp_seq,
 					    0, &reply));
-		igt_assert(gettime_us() - start < 500);
+		end = gettime_us();
+		igt_assert_f(end - start < 500, "Vblank wait took longer than "
+			     "expected: %luus >= %dus",
+			     end - start, 500);
 		igt_assert_eq(reply.sequence, exp_seq);
 		igt_assert(timercmp(&reply.ts, &o->flip_state.last_ts, ==));
 	}

--
2.22.0

_______________________________________________
igt-dev mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/igt-dev

Patchwork

CI

2019-06-17 14:33 UTC #1 lore raw

[igt-dev] ✗ Fi.CI.BAT: failure for tests/kms_flip: improve logging when timing out (rev2)

== Series Details ==

Series: tests/kms_flip: improve logging when timing out (rev2)
URL : https://patchwork.freedesktop.org/series/62100/
State : failure

== Summary ==

CI Bug Log - changes from CI_DRM_6285 -> IGTPW_3162
====================================================

Summary
-------

**FAILURE**

Serious unknown changes coming with IGTPW_3162 absolutely need to be verified manually.

If you think the reported changes have nothing to do with the changes introduced in IGTPW_3162, please notify your bug team to allow them to document this new failure mode, which will reduce false positives in CI.

External URL: https://patchwork.freedesktop.org/api/1.0/series/62100/revisions/2/mbox/

Possible new issues
-------------------

Here are the unknown changes that may have been introduced in IGTPW_3162:

### IGT changes ###

#### Possible regressions ####

* igt@i915_pm_rpm@module-reload:
- fi-skl-6600u: [PASS][1] -> [FAIL][2]
[1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-skl-6600u/igt@[email protected]
[2]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-skl-6600u/igt@[email protected]

* igt@i915_selftest@live_evict:
- fi-cfl-guc: [PASS][3] -> [INCOMPLETE][4]
[3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-cfl-guc/igt@i915_selftest@live_evict.html
[4]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-cfl-guc/igt@i915_selftest@live_evict.html

* igt@runner@aborted:
- fi-cfl-guc: NOTRUN -> [FAIL][5]
[5]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-cfl-guc/igt@[email protected]

Known issues
------------

Here are the changes found in IGTPW_3162 that come from known issues:

### IGT changes ###

#### Issues hit ####

* igt@kms_chamelium@common-hpd-after-suspend:
- fi-skl-6700k2: [PASS][6] -> [INCOMPLETE][7] ([fdo#104108])
[6]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-skl-6700k2/igt@[email protected]
[7]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-skl-6700k2/igt@[email protected]

* igt@kms_frontbuffer_tracking@basic:
- fi-hsw-peppy: [PASS][8] -> [DMESG-WARN][9] ([fdo#102614])
[8]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-hsw-peppy/igt@[email protected]
[9]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-hsw-peppy/igt@[email protected]
- fi-icl-u2: [PASS][10] -> [FAIL][11] ([fdo#103167])
[10]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-u2/igt@[email protected]
[11]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-u2/igt@[email protected]

#### Possible fixes ####

* igt@gem_ctx_switch@basic-default:
- fi-icl-guc: [INCOMPLETE][12] ([fdo#107713] / [fdo#108569]) -> [PASS][13]
[12]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-guc/igt@[email protected]
[13]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-guc/igt@[email protected]

* igt@gem_exec_reloc@basic-gtt:
- fi-icl-u3: [DMESG-WARN][14] ([fdo#107724]) -> [PASS][15]
[14]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-u3/igt@[email protected]
[15]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-u3/igt@[email protected]

* igt@i915_selftest@live_evict:
- fi-bsw-kefka: [DMESG-WARN][16] ([fdo#107709]) -> [PASS][17]
[16]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-bsw-kefka/igt@i915_selftest@live_evict.html
[17]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-bsw-kefka/igt@i915_selftest@live_evict.html

* igt@i915_selftest@live_hangcheck:
- fi-icl-dsi: [INCOMPLETE][18] ([fdo#107713] / [fdo#108569]) -> [PASS][19]
[18]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-dsi/igt@i915_selftest@live_hangcheck.html
[19]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-dsi/igt@i915_selftest@live_hangcheck.html

[fdo#102614]: https://bugs.freedesktop.org/show_bug.cgi?id=102614
[fdo#103167]: https://bugs.freedesktop.org/show_bug.cgi?id=103167
[fdo#104108]: https://bugs.freedesktop.org/show_bug.cgi?id=104108
[fdo#107709]: https://bugs.freedesktop.org/show_bug.cgi?id=107709
[fdo#107713]: https://bugs.freedesktop.org/show_bug.cgi?id=107713
[fdo#107724]: https://bugs.freedesktop.org/show_bug.cgi?id=107724
[fdo#108569]: https://bugs.freedesktop.org/show_bug.cgi?id=108569

Participating hosts (50 -> 37)
------------------------------

Missing (13): fi-kbl-soraka fi-cml-u2 fi-ilk-m540 fi-hsw-4200u fi-skl-guc fi-byt-squawks fi-bsw-cyan fi-whl-u fi-skl-iommu fi-icl-y fi-byt-clapper fi-bdw-samus fi-cml-u

Build changes
-------------

* IGT: IGT_5059 -> IGTPW_3162

CI_DRM_6285: f5c04040623ef8068dd881438d53e7b5834919fd @ git://anongit.freedesktop.org/gfx-ci/linux
IGTPW_3162: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/
IGT_5059: 1f67ee0d09d6513f487f2be74aae9700e755258a @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/
_______________________________________________
igt-dev mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/igt-dev

Ser, Simon

author

2019-06-17 14:49 UTC #2 lore raw

Re: [igt-dev] ✗ Fi.CI.BAT: failure for tests/kms_flip: improve logging when timing out (rev2)

Quoted 39 lines · Patchwork

== Series Details ==
Series: tests/kms_flip: improve logging when timing out (rev2)
URL : https://patchwork.freedesktop.org/series/62100/
State : failure
== Summary ==
CI Bug Log - changes from CI_DRM_6285 -> IGTPW_3162
====================================================
Summary
-------
**FAILURE**
Serious unknown changes coming with IGTPW_3162 absolutely need to be verified manually.
If you think the reported changes have nothing to do with the changes introduced in IGTPW_3162, please notify your bug team to allow them to document this new failure mode, which will reduce false positives in CI.
External URL: https://patchwork.freedesktop.org/api/1.0/series/62100/revisions/2/mbox/
Possible new issues
-------------------
Here are the unknown changes that may have been introduced in IGTPW_3162:
### IGT changes ###
#### Possible regressions ####
* igt@i915_pm_rpm@module-reload:
- fi-skl-6600u: [PASS][1] -> [FAIL][2]
[1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-skl-6600u/igt@[email protected]
[2]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-skl-6600u/igt@[email protected]

Quoted 8 lines

* igt@i915_selftest@live_evict:
- fi-cfl-guc: [PASS][3] -> [INCOMPLETE][4]
[3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-cfl-guc/igt@i915_selftest@live_evict.html
[4]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-cfl-guc/igt@i915_selftest@live_evict.html
* igt@runner@aborted:
- fi-cfl-guc: NOTRUN -> [FAIL][5]
[5]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-cfl-guc/igt@[email protected]

Cc Martin

Quoted 67 lines

Known issues
------------
Here are the changes found in IGTPW_3162 that come from known issues:
### IGT changes ###
#### Issues hit ####
* igt@kms_chamelium@common-hpd-after-suspend:
- fi-skl-6700k2: [PASS][6] -> [INCOMPLETE][7] ([fdo#104108])
[6]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-skl-6700k2/igt@[email protected]
[7]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-skl-6700k2/igt@[email protected]
* igt@kms_frontbuffer_tracking@basic:
- fi-hsw-peppy: [PASS][8] -> [DMESG-WARN][9] ([fdo#102614])
[8]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-hsw-peppy/igt@[email protected]
[9]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-hsw-peppy/igt@[email protected]
- fi-icl-u2: [PASS][10] -> [FAIL][11] ([fdo#103167])
[10]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-u2/igt@[email protected]
[11]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-u2/igt@[email protected]
#### Possible fixes ####
* igt@gem_ctx_switch@basic-default:
- fi-icl-guc: [INCOMPLETE][12] ([fdo#107713] / [fdo#108569]) -> [PASS][13]
[12]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-guc/igt@[email protected]
[13]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-guc/igt@[email protected]
* igt@gem_exec_reloc@basic-gtt:
- fi-icl-u3: [DMESG-WARN][14] ([fdo#107724]) -> [PASS][15]
[14]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-u3/igt@[email protected]
[15]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-u3/igt@[email protected]
* igt@i915_selftest@live_evict:
- fi-bsw-kefka: [DMESG-WARN][16] ([fdo#107709]) -> [PASS][17]
[16]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-bsw-kefka/igt@i915_selftest@live_evict.html
[17]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-bsw-kefka/igt@i915_selftest@live_evict.html
* igt@i915_selftest@live_hangcheck:
- fi-icl-dsi: [INCOMPLETE][18] ([fdo#107713] / [fdo#108569]) -> [PASS][19]
[18]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-dsi/igt@i915_selftest@live_hangcheck.html
[19]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-dsi/igt@i915_selftest@live_hangcheck.html
[fdo#102614]: https://bugs.freedesktop.org/show_bug.cgi?id=102614
[fdo#103167]: https://bugs.freedesktop.org/show_bug.cgi?id=103167
[fdo#104108]: https://bugs.freedesktop.org/show_bug.cgi?id=104108
[fdo#107709]: https://bugs.freedesktop.org/show_bug.cgi?id=107709
[fdo#107713]: https://bugs.freedesktop.org/show_bug.cgi?id=107713
[fdo#107724]: https://bugs.freedesktop.org/show_bug.cgi?id=107724
[fdo#108569]: https://bugs.freedesktop.org/show_bug.cgi?id=108569
Participating hosts (50 -> 37)
------------------------------
Missing (13): fi-kbl-soraka fi-cml-u2 fi-ilk-m540 fi-hsw-4200u fi-skl-guc fi-byt-squawks fi-bsw-cyan fi-whl-u fi-skl-iommu fi-icl-y fi-byt-clapper fi-bdw-samus fi-cml-u
Build changes
-------------
* IGT: IGT_5059 -> IGTPW_3162

Quoted 7 lines

CI_DRM_6285: f5c04040623ef8068dd881438d53e7b5834919fd @ git://anongit.freedesktop.org/gfx-ci/linux
IGTPW_3162: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/
IGT_5059: 1f67ee0d09d6513f487f2be74aae9700e755258a @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
== Logs ==
For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/

_______________________________________________
igt-dev mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/igt-dev

Patchwork

CI

2019-06-17 15:17 UTC #3 lore raw

[igt-dev] ✗ Fi.CI.BAT: failure for tests/kms_flip: improve logging when timing out (rev2)

In reply to Simon Ser

== Series Details ==

Series: tests/kms_flip: improve logging when timing out (rev2)
URL : https://patchwork.freedesktop.org/series/62100/
State : failure

== Summary ==

CI Bug Log - changes from CI_DRM_6285 -> IGTPW_3162
====================================================

Summary
-------

**FAILURE**

Serious unknown changes coming with IGTPW_3162 absolutely need to be verified manually.

If you think the reported changes have nothing to do with the changes introduced in IGTPW_3162, please notify your bug team to allow them to document this new failure mode, which will reduce false positives in CI.

External URL: https://patchwork.freedesktop.org/api/1.0/series/62100/revisions/2/mbox/

Possible new issues
-------------------

Here are the unknown changes that may have been introduced in IGTPW_3162:

### IGT changes ###

#### Possible regressions ####

* igt@i915_pm_rpm@module-reload:
- fi-skl-6600u: [PASS][1] -> [FAIL][2]
[1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-skl-6600u/igt@[email protected]
[2]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-skl-6600u/igt@[email protected]

* igt@i915_selftest@live_evict:
- fi-cfl-guc: [PASS][3] -> [INCOMPLETE][4]
[3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-cfl-guc/igt@i915_selftest@live_evict.html
[4]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-cfl-guc/igt@i915_selftest@live_evict.html

* igt@runner@aborted:
- fi-cfl-guc: NOTRUN -> [FAIL][5]
[5]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-cfl-guc/igt@[email protected]

Known issues
------------

Here are the changes found in IGTPW_3162 that come from known issues:

### IGT changes ###

#### Issues hit ####

* igt@kms_chamelium@common-hpd-after-suspend:
- fi-skl-6700k2: [PASS][6] -> [INCOMPLETE][7] ([fdo#104108])
[6]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-skl-6700k2/igt@[email protected]
[7]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-skl-6700k2/igt@[email protected]

* igt@kms_frontbuffer_tracking@basic:
- fi-hsw-peppy: [PASS][8] -> [DMESG-WARN][9] ([fdo#102614])
[8]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-hsw-peppy/igt@[email protected]
[9]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-hsw-peppy/igt@[email protected]
- fi-icl-u2: [PASS][10] -> [FAIL][11] ([fdo#103167])
[10]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-u2/igt@[email protected]
[11]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-u2/igt@[email protected]

#### Possible fixes ####

* igt@gem_ctx_switch@basic-default:
- fi-icl-guc: [INCOMPLETE][12] ([fdo#107713] / [fdo#108569]) -> [PASS][13]
[12]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-guc/igt@[email protected]
[13]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-guc/igt@[email protected]

* igt@gem_exec_reloc@basic-gtt:
- fi-icl-u3: [DMESG-WARN][14] ([fdo#107724]) -> [PASS][15]
[14]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-u3/igt@[email protected]
[15]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-u3/igt@[email protected]

* igt@i915_selftest@live_evict:
- fi-bsw-kefka: [DMESG-WARN][16] ([fdo#107709]) -> [PASS][17]
[16]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-bsw-kefka/igt@i915_selftest@live_evict.html
[17]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-bsw-kefka/igt@i915_selftest@live_evict.html

* igt@i915_selftest@live_hangcheck:
- fi-icl-y: [INCOMPLETE][18] ([fdo#107713] / [fdo#108569]) -> [PASS][19]
[18]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-y/igt@i915_selftest@live_hangcheck.html
[19]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-y/igt@i915_selftest@live_hangcheck.html
- fi-icl-dsi: [INCOMPLETE][20] ([fdo#107713] / [fdo#108569]) -> [PASS][21]
[20]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_6285/fi-icl-dsi/igt@i915_selftest@live_hangcheck.html
[21]: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/fi-icl-dsi/igt@i915_selftest@live_hangcheck.html

[fdo#102614]: https://bugs.freedesktop.org/show_bug.cgi?id=102614
[fdo#103167]: https://bugs.freedesktop.org/show_bug.cgi?id=103167
[fdo#104108]: https://bugs.freedesktop.org/show_bug.cgi?id=104108
[fdo#107709]: https://bugs.freedesktop.org/show_bug.cgi?id=107709
[fdo#107713]: https://bugs.freedesktop.org/show_bug.cgi?id=107713
[fdo#107724]: https://bugs.freedesktop.org/show_bug.cgi?id=107724
[fdo#108569]: https://bugs.freedesktop.org/show_bug.cgi?id=108569

Participating hosts (50 -> 38)
------------------------------

Missing (12): fi-kbl-soraka fi-cml-u2 fi-ilk-m540 fi-hsw-4200u fi-skl-guc fi-byt-squawks fi-bsw-cyan fi-whl-u fi-skl-iommu fi-byt-clapper fi-bdw-samus fi-cml-u

Build changes
-------------

* IGT: IGT_5059 -> IGTPW_3162

CI_DRM_6285: f5c04040623ef8068dd881438d53e7b5834919fd @ git://anongit.freedesktop.org/gfx-ci/linux
IGTPW_3162: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/
IGT_5059: 1f67ee0d09d6513f487f2be74aae9700e755258a @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_3162/
_______________________________________________
igt-dev mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/igt-dev

Arkadiusz Hiler

2019-06-19 14:44 UTC #4 lore raw

In reply to Simon Ser

Quoted 2 lines · Simon Ser

Signed-off-by Simon Ser <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105363

Since there is CI bug associated with this assert we would need to adjust the filters before mergeing. Please make sure that this happens.

Quoted 18 lines

---

v2: clarify log message

 tests/kms_flip.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

tests/kms_flip.c +1 -1

index 2a158d97bbec..6eadb71b3ed9 100755
@@ -686,14 +686,17 @@ static unsigned int run_test_step(struct test_output *o)
 	    !(o->pending_events & EVENT_VBLANK) && o->flip_state.count > 0) {
 		struct vblank_reply reply;
 		unsigned int exp_seq;
-		unsigned long start;
+		unsigned long start, end;

tests/kms_flip.c static unsigned int run_test_step(struct test_output *o) · line 699

Quoted 10 lines

tests/kms_flip.c +4 -1

 		exp_seq = o->flip_state.current_seq;
 		start = gettime_us();
 		do_or_die(__wait_for_vblank(TEST_VBLANK_ABSOLUTE |
 					    TEST_VBLANK_BLOCK, o->pipe, exp_seq,
 					    0, &reply));
-		igt_assert(gettime_us() - start < 500);
+		end = gettime_us();
+		igt_assert_f(end - start < 500, "Vblank wait took longer than "
+			     "expected: %luus >= %dus",
+			     end - start, 500);

What about adding an igt_debug() for the (end - start)? That would help us to understand how long does it usually take, so we would have a baseline for comparison.

Quoted 10 lines

tests/kms_flip.c +0 -1
 		igt_assert_eq(reply.sequence, exp_seq);
 		igt_assert(timercmp(&reply.ts, &o->flip_state.last_ts, ==));
 	}
--
2.22.0
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