1569512 - Intermittent dom/events/test/test_bug656379-2.html | Button 2 should be hovered after mousemove over button2 / label2 - got false, expected true

Status: RESOLVED FIXED

(Core :: DOM: Events, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: cbrindusan [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=258718389&repo=mozilla-inbound
Full log: https://queue.taskcluster.net/v1/task/CbCWapwURd-9v-E-lK_S6g/runs/0/artifacts/public/logs/live_backing.log

---

[task 2019-07-29T00:14:40.332Z] 00:14:40 INFO - TEST-START | dom/events/test/test_bug656379-2.html
[task 2019-07-29T00:14:40.442Z] 00:14:40 INFO - TEST-INFO | started process screentopng
[task 2019-07-29T00:14:41.248Z] 00:14:41 INFO - TEST-INFO | screentopng: exit 0
[task 2019-07-29T00:14:41.249Z] 00:14:41 INFO - Buffered messages logged at 00:14:40
[task 2019-07-29T00:14:41.251Z] 00:14:41 INFO - must wait for load
[task 2019-07-29T00:14:41.252Z] 00:14:41 INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 1 should be hovered after mousemove over label1
[task 2019-07-29T00:14:41.252Z] 00:14:41 INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 1 should be hovered after mousemove over label1
[task 2019-07-29T00:14:41.253Z] 00:14:41 INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 2 should not be hovered after mousemove over label1
[task 2019-07-29T00:14:41.253Z] 00:14:41 INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 2 should not be hovered after mousemove over label1
[task 2019-07-29T00:14:41.254Z] 00:14:41 INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 1 should not be hovered after mousemove over button2
[task 2019-07-29T00:14:41.254Z] 00:14:41 INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 1 should not be hovered after mousemove over button2
[task 2019-07-29T00:14:41.254Z] 00:14:41 INFO - Buffered messages finished
[task 2019-07-29T00:14:41.255Z] 00:14:41 INFO - TEST-UNEXPECTED-FAIL | dom/events/test/test_bug656379-2.html | Button 2 should be hovered after mousemove over button2 - got false, expected true

Comment 1

[Intermittent Failures Robot]

1 failures in 4608 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-inbound: 1

Platform breakdown:

• linux64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-07-22&endday=2019-07-28&tree=all

Comment 2

[Intermittent Failures Robot]

14 failures in 4439 pushes (0.003 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• try: 3
• mozilla-central: 5
• autoland: 4
• mozilla-inbound: 2

Platform breakdown:

• linux64-qr: 8
• linux64-shippable-qr: 6

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-07-29&endday=2019-08-04&tree=all

Comment 3

[Intermittent Failures Robot]

4 failures in 4666 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 3
• mozilla-central: 1

Platform breakdown:

• linux64-shippable-qr: 2
• linux64-qr: 2

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-08-05&endday=2019-08-11&tree=all

Comment 4

[Intermittent Failures Robot]

5 failures in 4839 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 3
• autoland: 2

Platform breakdown:

• linux64-qr: 2
• linux64-shippable-qr: 2
• linux64-shippable: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-08-12&endday=2019-08-18&tree=all

Comment 5

[Intermittent Failures Robot]

1 failures in 5073 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 1

Platform breakdown:

• linux64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-08-19&endday=2019-08-25&tree=all

Comment 6

[Intermittent Failures Robot]

4 failures in 4408 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 2
• autoland: 2

Platform breakdown:

• linux64-qr: 4

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-09-02&endday=2019-09-08&tree=all

Comment 7

[Intermittent Failures Robot]

2 failures in 4350 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1
• mozilla-central: 1

Platform breakdown:

• linux64-shippable: 1
• linux64-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-09-16&endday=2019-09-22&tree=all

Comment 8

[Intermittent Failures Robot]

4 failures in 4530 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1
• mozilla-central: 3

Platform breakdown:

• linux64-shippable-qr: 2
• linux64-qr: 2

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-09-23&endday=2019-09-29&tree=all

Comment 9

[Intermittent Failures Robot]

1 failures in 4292 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• try: 1

Platform breakdown:

• linux64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-09-30&endday=2019-10-06&tree=all

Comment 10

[Intermittent Failures Robot]

1 failures in 3964 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 1

Platform breakdown:

• linux64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-10-14&endday=2019-10-20&tree=all

Comment 11

[Intermittent Failures Robot]

3 failures in 4314 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 2
• try: 1

Platform breakdown:

• linux64-shippable-qr: 2
• linux64-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-10-28&endday=2019-11-03&tree=all

Comment 12

[Intermittent Failures Robot]

3 failures in 4850 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-beta: 1
• mozilla-esr68: 1
• mozilla-central: 1

Platform breakdown:

• linux64-shippable: 2
• linux64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-11-04&endday=2019-11-10&tree=all

Comment 13

[Intermittent Failures Robot]

1 failures in 4207 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-beta: 1

Platform breakdown:

• linux64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-11-11&endday=2019-11-17&tree=all

Comment 14

[Intermittent Failures Robot]

1 failures in 5444 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform breakdown:

• linux64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-11-18&endday=2019-11-24&tree=all

Comment 15

[Intermittent Failures Robot]

9 failures in 4331 pushes (0.002 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• try: 7
• mozilla-central: 2

Platform breakdown:

• linux64-qr: 2
• linux64: 5
• windows10-64-shippable-qr: 1
• windows10-64-shippable: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-11-25&endday=2019-12-01&tree=all

Comment 16

[Intermittent Failures Robot]

2 failures in 5144 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1
• try: 1

Platform breakdown:

• windows10-64-shippable-qr: 2

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-12-02&endday=2019-12-08&tree=all

Comment 17

[Intermittent Failures Robot]

10 failures in 4867 pushes (0.002 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-beta: 2
• autoland: 4
• mozilla-central: 3
• try: 1

Platform breakdown:

• macosx1014-64-devedition: 1
• macosx1014-64-shippable: 4
• windows10-64: 2
• windows10-64-shippable: 1
• windows10-64-shippable-qr: 2

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-12-09&endday=2019-12-15&tree=all

Comment 18

[Intermittent Failures Robot]

11 failures in 4582 pushes (0.002 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-release: 1
• autoland: 4
• try: 3
• mozilla-central: 2
• mozilla-beta: 1

Platform breakdown:

• linux64-shippable-qr: 1
• windows10-64-shippable: 1
• windows10-64-qr: 1
• macosx1014-64-shippable: 3
• windows10-64-shippable-qr: 4
• windows10-64: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-12-16&endday=2019-12-22&tree=all

Comment 19

[Intermittent Failures Robot]

7 failures in 1365 pushes (0.005 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 3
• mozilla-central: 3
• mozilla-beta: 1

Platform breakdown:

• windows10-64-shippable: 2
• windows10-64-qr: 1
• windows10-64-shippable-qr: 3
• macosx1014-64-shippable: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-12-23&endday=2019-12-29&tree=all

Comment 20

[Intermittent Failures Robot]

6 failures in 1862 pushes (0.003 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 3
• mozilla-central: 2
• try: 1

Platform breakdown:

• windows10-64-shippable: 1
• windows10-64-shippable-qr: 2
• macosx1014-64-shippable: 1
• linux64-shippable-qr: 1
• linux64-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2019-12-30&endday=2020-01-05&tree=all

Comment 21

[Intermittent Failures Robot]

4 failures in 4472 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 1
• autoland: 3

Platform breakdown:

• windows10-64-qr: 1
• windows10-64-shippable-qr: 3

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-01-06&endday=2020-01-12&tree=all

Comment 22

[Intermittent Failures Robot]

6 failures in 3773 pushes (0.002 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 2
• autoland: 3
• mozilla-beta: 1

Platform breakdown:

• linux64-qr: 1
• macosx1014-64-shippable: 2
• windows10-64-shippable: 2
• linux1804-64-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-01-13&endday=2020-01-19&tree=all

Comment 23

[Intermittent Failures Robot]

8 failures in 4004 pushes (0.002 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• try: 2
• autoland: 5
• mozilla-beta: 1

Platform breakdown:

• macosx1014-64-devedition: 1
• windows10-64-shippable-qr: 1
• macosx1014-64-shippable: 4
• windows10-64-devedition: 1
• linux1804-64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-01-20&endday=2020-01-26&tree=all

Comment 24

[Intermittent Failures Robot]

6 failures in 2190 pushes (0.003 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-beta: 1
• autoland: 2
• mozilla-central: 3

Platform breakdown:

• macosx1014-64-shippable: 2
• windows10-64-shippable: 1
• linux1804-64-shippable-qr: 1
• windows10-64-shippable-qr: 1
• linux1804-64-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-01-27&endday=2020-02-02&tree=all

Comment 25

[Intermittent Failures Robot]

9 failures in 3364 pushes (0.003 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 3
• autoland: 4
• try: 2

Platform breakdown:

• windows10-64: 1
• windows10-64-shippable-qr: 2
• macosx1014-64-shippable: 2
• linux1804-64: 1
• linux1804-64-qr: 1
• windows10-64-shippable: 1
• windows10-64-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-02-03&endday=2020-02-09&tree=all

Comment 26

[Intermittent Failures Robot]

5 failures in 4690 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• try: 2
• autoland: 3

Platform breakdown:

• windows10-64-shippable: 3
• windows10-64-shippable-qr: 1
• linux1804-64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-02-10&endday=2020-02-16&tree=all

Comment 27

[Intermittent Failures Robot]

9 failures in 4045 pushes (0.002 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 5
• mozilla-central: 4

Platform breakdown:

• windows10-64-shippable: 2
• windows10-64-shippable-qr: 2
• linux1804-64: 1
• linux1804-64-shippable: 1
• linux1804-64-qr: 1
• windows10-64-qr: 1
• linux1804-64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-02-17&endday=2020-02-23&tree=all

Comment 28

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

Looks like that this bug and bug 1545222 are caused by same bug. Both of them occur only on opt and especially on shippable build. So, I guess that it's caused by some race condition.

I got log of mousemove for this bug

[task 2020-03-01T12:04:39.717Z] 12:04:39     INFO - TEST-START | dom/events/test/test_bug656379-2.html
[task 2020-03-01T12:04:39.793Z] 12:04:39     INFO - TEST-INFO | started process screentopng
[task 2020-03-01T12:04:40.114Z] 12:04:40     INFO - TEST-INFO | screentopng: exit 0
[task 2020-03-01T12:04:40.115Z] 12:04:40     INFO - Buffered messages logged at 12:04:39
[task 2020-03-01T12:04:40.115Z] 12:04:40     INFO - must wait for load
[task 2020-03-01T12:04:40.115Z] 12:04:40     INFO - mouseover on P#display > LABEL#label1
[task 2020-03-01T12:04:40.115Z] 12:04:40     INFO - mouseenter on HTML
[task 2020-03-01T12:04:40.115Z] 12:04:40     INFO - mouseenter on HTML > BODY
[task 2020-03-01T12:04:40.115Z] 12:04:40     INFO - mouseenter on P#display
[task 2020-03-01T12:04:40.115Z] 12:04:40     INFO - mouseenter on P#display > LABEL#label1
[task 2020-03-01T12:04:40.115Z] 12:04:40     INFO - Synthesizing mousemove on label1...
[task 2020-03-01T12:04:40.115Z] 12:04:40     INFO - mousemove on P#display > LABEL#label1
[task 2020-03-01T12:04:40.116Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 1 should be hovered after mousemove over label1 
[task 2020-03-01T12:04:40.116Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 1 should be hovered after mousemove over label1 
[task 2020-03-01T12:04:40.116Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 2 should not be hovered after mousemove over label1 
[task 2020-03-01T12:04:40.116Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 2 should not be hovered after mousemove over label1 
[task 2020-03-01T12:04:40.117Z] 12:04:40     INFO - Synthesizing mousemove on button2...
[task 2020-03-01T12:04:40.117Z] 12:04:40     INFO - mouseout on P#display > LABEL#label1
[task 2020-03-01T12:04:40.117Z] 12:04:40     INFO - mouseleave on P#display > LABEL#label1
[task 2020-03-01T12:04:40.117Z] 12:04:40     INFO - mouseover on P#display > LABEL > INPUT#button2
[task 2020-03-01T12:04:40.118Z] 12:04:40     INFO - mouseenter on P#display > LABEL
[task 2020-03-01T12:04:40.119Z] 12:04:40     INFO - mouseenter on P#display > LABEL > INPUT#button2
[task 2020-03-01T12:04:40.119Z] 12:04:40     INFO - mousemove on P#display > LABEL > INPUT#button2
[task 2020-03-01T12:04:40.120Z] 12:04:40     INFO - mouseout on P#display > LABEL > INPUT#button2
[task 2020-03-01T12:04:40.120Z] 12:04:40     INFO - mouseleave on P#display > LABEL > INPUT#button2
[task 2020-03-01T12:04:40.120Z] 12:04:40     INFO - mouseleave on P#display > LABEL
[task 2020-03-01T12:04:40.122Z] 12:04:40     INFO - mouseleave on P#display
[task 2020-03-01T12:04:40.123Z] 12:04:40     INFO - mouseover on HTML > BODY
[task 2020-03-01T12:04:40.123Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 1 should not be hovered after mousemove over button2 
[task 2020-03-01T12:04:40.124Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 1 should not be hovered after mousemove over button2 
[task 2020-03-01T12:04:40.125Z] 12:04:40     INFO - Buffered messages finished
[task 2020-03-01T12:04:40.126Z] 12:04:40     INFO - TEST-UNEXPECTED-FAIL | dom/events/test/test_bug656379-2.html | Button 2 should be hovered after mousemove over button2 - got false, expected true
[task 2020-03-01T12:04:40.126Z] 12:04:40     INFO -     SimpleTest.is@SimpleTest/SimpleTest.js:383:14
[task 2020-03-01T12:04:40.126Z] 12:04:40     INFO -     tests@dom/events/test/test_bug656379-2.html:80:5
[task 2020-03-01T12:04:40.127Z] 12:04:40     INFO -     execNext@dom/events/test/test_bug656379-2.html:101:30
[task 2020-03-01T12:04:40.127Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 2 should not be hovered after mousemove over label2 
[task 2020-03-01T12:04:40.129Z] 12:04:40     INFO - Synthesizing mousemove on label2...
[task 2020-03-01T12:04:40.129Z] 12:04:40     INFO - mouseout on HTML > BODY
[task 2020-03-01T12:04:40.129Z] 12:04:40     INFO - mouseover on P#display > LABEL > SPAN#label2
[task 2020-03-01T12:04:40.130Z] 12:04:40     INFO - mouseenter on P#display
[task 2020-03-01T12:04:40.130Z] 12:04:40     INFO - mouseenter on P#display > LABEL
[task 2020-03-01T12:04:40.131Z] 12:04:40     INFO - mouseenter on P#display > LABEL > SPAN#label2
[task 2020-03-01T12:04:40.132Z] 12:04:40     INFO - mousemove on P#display > LABEL > SPAN#label2
[task 2020-03-01T12:04:40.133Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 1 should not be hovered after mousemove over label2 
[task 2020-03-01T12:04:40.133Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 1 should not be hovered after mousemove over label2 

And same for bug 1545222:

[task 2020-03-01T04:57:03.470Z] 04:57:03     INFO - TEST-START | dom/events/test/test_bug656379-2.html
[task 2020-03-01T04:57:03.526Z] 04:57:03     INFO - TEST-INFO | started process screentopng
[task 2020-03-01T04:57:03.853Z] 04:57:03     INFO - TEST-INFO | screentopng: exit 0
[task 2020-03-01T04:57:03.853Z] 04:57:03     INFO - Buffered messages logged at 04:57:03
[task 2020-03-01T04:57:03.853Z] 04:57:03     INFO - must wait for load
[task 2020-03-01T04:57:03.854Z] 04:57:03     INFO - mousemove on P#display > LABEL#label1
[task 2020-03-01T04:57:03.854Z] 04:57:03     INFO - Buffered messages finished
[task 2020-03-01T04:57:03.858Z] 04:57:03     INFO - TEST-UNEXPECTED-FAIL | dom/events/test/test_bug656379-2.html | Button 1 should be hovered after mousemove over label1 - got false, expected true
[task 2020-03-01T04:57:03.858Z] 04:57:03     INFO -     SimpleTest.is@SimpleTest/SimpleTest.js:383:14
[task 2020-03-01T04:57:03.858Z] 04:57:03     INFO -     tests@dom/events/test/test_bug656379-2.html:58:5
[task 2020-03-01T04:57:03.858Z] 04:57:03     INFO -     execNext@dom/events/test/test_bug656379-2.html:92:30
[task 2020-03-01T04:57:03.858Z] 04:57:03     INFO - Not taking screenshot here: see the one that was previously logged
[task 2020-03-01T04:57:03.858Z] 04:57:03     INFO - TEST-UNEXPECTED-FAIL | dom/events/test/test_bug656379-2.html | Label 1 should be hovered after mousemove over label1 - got false, expected true
[task 2020-03-01T04:57:03.858Z] 04:57:03     INFO -     SimpleTest.is@SimpleTest/SimpleTest.js:383:14
[task 2020-03-01T04:57:03.858Z] 04:57:03     INFO -     tests@dom/events/test/test_bug656379-2.html:60:5
[task 2020-03-01T04:57:03.858Z] 04:57:03     INFO -     execNext@dom/events/test/test_bug656379-2.html:92:30
[task 2020-03-01T04:57:03.858Z] 04:57:03     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 2 should not be hovered after mousemove over label1 
[task 2020-03-01T04:57:03.859Z] 04:57:03     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 2 should not be hovered after mousemove over label1 
[task 2020-03-01T04:57:03.859Z] 04:57:03     INFO - mousemove on P#display > LABEL > INPUT#button2
[task 2020-03-01T04:57:03.859Z] 04:57:03     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 1 should not be hovered after mousemove over button2 
[task 2020-03-01T04:57:03.860Z] 04:57:03     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 1 should not be hovered after mousemove over button2 
[task 2020-03-01T04:57:03.861Z] 04:57:03     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 2 should be hovered after mousemove over button2 
[task 2020-03-01T04:57:03.861Z] 04:57:03     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 2 should not be hovered after mousemove over label2 
[task 2020-03-01T04:57:03.862Z] 04:57:03     INFO - mousemove on P#display > LABEL > SPAN#label2
[task 2020-03-01T04:57:03.863Z] 04:57:03     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 1 should not be hovered after mousemove over label2 
[task 2020-03-01T04:57:03.865Z] 04:57:03     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 1 should not be hovered after mousemove over label2 
[task 2020-03-01T04:57:03.865Z] 04:57:03     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 2 should be hovered after mousemove over label2 
[task 2020-03-01T04:57:03.867Z] 04:57:03     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 2 should be hovered after mousemove over label2 
[task 2020-03-01T04:57:03.867Z] 04:57:03     INFO - GECKO(2405) | MEMORY STAT | vsize 2617MB | residentFast 189MB | heapAllocated 34MB
[task 2020-03-01T04:57:03.868Z] 04:57:03     INFO - TEST-OK | dom/events/test/test_bug656379-2.html | took 65ms

In those cases, mousemove events are fired as expected. The :hover state is set by EventStateManager::PreHandleEvent() -> EventStateManager::GenerateMouseEnterExit() -> EventStateManager::NotifyMouseOver((). I.e., the state is updated synchronously before dispathcing mousemove event at least in DOM code.

On the other hand, Element::Matches() goes into Stylo.

Emilio, is all resoucre about :hover state in stylo updated synchronously when EventStateManager updeates it?

Comment 29

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

Updated the log for this bug with mouseenter, mouseleave, mouseover and mouseout.

Comment 30

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

Oddly, after mousemove, unexpected mouseout and mouseleave are fired, that must be the cause of this bug.

[task 2020-03-01T12:04:40.119Z] 12:04:40     INFO - mousemove on P#display > LABEL > INPUT#button2
[task 2020-03-01T12:04:40.120Z] 12:04:40     INFO - mouseout on P#display > LABEL > INPUT#button2
[task 2020-03-01T12:04:40.120Z] 12:04:40     INFO - mouseleave on P#display > LABEL > INPUT#button2
[task 2020-03-01T12:04:40.120Z] 12:04:40     INFO - mouseleave on P#display > LABEL
[task 2020-03-01T12:04:40.122Z] 12:04:40     INFO - mouseleave on P#display
[task 2020-03-01T12:04:40.123Z] 12:04:40     INFO - mouseover on HTML > BODY
[task 2020-03-01T12:04:40.123Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Button 1 should not be hovered after mousemove over button2 
[task 2020-03-01T12:04:40.124Z] 12:04:40     INFO - TEST-PASS | dom/events/test/test_bug656379-2.html | Label 1 should not be hovered after mousemove over button2 
[task 2020-03-01T12:04:40.125Z] 12:04:40     INFO - Buffered messages finished
[task 2020-03-01T12:04:40.126Z] 12:04:40     INFO - TEST-UNEXPECTED-FAIL | dom/events/test/test_bug656379-2.html | Button 2 should be hovered after mousemove over button2 - got false, expected true
[task 2020-03-01T12:04:40.126Z] 12:04:40     INFO -     SimpleTest.is@SimpleTest/SimpleTest.js:383:14
[task 2020-03-01T12:04:40.126Z] 12:04:40     INFO -     tests@dom/events/test/test_bug656379-2.html:80:5
[task 2020-03-01T12:04:40.127Z] 12:04:40     INFO -     execNext@dom/events/test/test_bug656379-2.html:101:30

Comment 31

[Emilio Cobos Álvarez (:emilio)]

::Matches(":hover") synchronously reflects the event state flag, yeah.

Comment 32

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

Thanks, and also according to comment 30, it seems that there is an unexpected synthesized mousemove event which caused mouseout and mouseleave. I guess, it could be caused by the style change by :hover state change. Although I've not investigated whether another synthesized mouse move will occur later, this might detect an existing bug rather than bug of the test.
https://searchfox.org/mozilla-central/search?q=symbol:_ZN7mozilla9PresShell19SynthesizeMouseMoveEb&redirect=false

Comment 33

[Intermittent Failures Robot]

18 failures in 5233 pushes (0.003 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 2
• autoland: 3
• try: 13

Platform breakdown:

• linux1804-64-shippable-qr: 6
• linux1804-64-qr: 7
• linux1804-64-shippable: 2
• windows10-64-qr: 1
• macosx1014-64-devedition: 1
• windows10-64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-02-24&endday=2020-03-01&tree=all

Comment 34

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

Attachment: Bug 1569512 - Make `PresShell` ignore synthesized `mousemove` events coming from another process if the child process stores mouse location of synthesized mouse events for tests r=smaug

The reason of intermittent failure of test_bug656379-2.html is, synthesized
mousemove event coming from the parent process causes mouseout and
mouseleave events of the last synthesized mousemove in the test. The
reason is, synthesized mousemove for tests make PresShell in the content
process record the cursor location, but won't make it PresShell in the
parent process do it. Therefore, if synthesized mousemove in parent process
may be fired outdated mouse cursor location and PresShell treats it as normal
mousemove, then, tests may get unexpected :hover state.

This patch makes WidgetEvent::mFlags have a flag to indicate whether it
came from another process. Then, makes PresShell::HandleEvent() does not
treat synthesized mousemove events coming from another process as-is.
Finally, instead, make it try to fire synthesized mousemove in the process
with the existing path. (That means that if the root PresShell in the
content process does not store last mouse location, the coming mousemove
event is just discarded.)

Comment 35

[Intermittent Failures Robot]

14 failures in 5483 pushes (0.003 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• try: 8
• autoland: 4
• mozilla-central: 1
• mozilla-release: 1

Platform breakdown:

• linux1804-64: 2
• linux1804-64-qr: 3
• linux1804-64-shippable-qr: 4
• windows10-64: 1
• windows10-64-shippable-qr: 3
• macosx1014-64-devedition: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-03-02&endday=2020-03-08&tree=all

Comment 36

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/9f1416f188e7
Make `PresShell` ignore synthesized `mousemove` events coming from another process if the child process stores mouse location of synthesized mouse events for tests r=smaug

Comment 37

[Oana Pop-Rus]

https://hg.mozilla.org/mozilla-central/rev/9f1416f188e7

Comment 38

[BugBot [:suhaib / :marco/ :calixte]]

The patch landed in nightly and beta is affected.
:masayuki, is this bug important enough to require an uplift?
If not please set status_beta to wontfix.

For more information, please visit auto_nag documentation.

Comment 39

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

The patch touched main path of event handling so that it's too risky.

Comment 40

[Intermittent Failures Robot]

3 failures in 5336 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 1
• mozilla-release: 1
• mozilla-beta: 1

Platform breakdown:

• windows10-64-qr: 1
• windows10-64-shippable: 1
• linux1804-64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-03-09&endday=2020-03-15&tree=all

Comment 41

[Intermittent Failures Robot]

1 failures in 4955 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-beta: 1

Platform breakdown:

• windows10-64-devedition: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-03-16&endday=2020-03-22&tree=all

Comment 42

[Intermittent Failures Robot]

1 failures in 4773 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-beta: 1

Platform breakdown:

• linux1804-64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-03-23&endday=2020-03-29&tree=all

Comment 43

[Intermittent Failures Robot]

1 failures in 4823 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-release: 1

Platform breakdown:

• linux1804-64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-04-06&endday=2020-04-12&tree=all

Comment 44

[Intermittent Failures Robot]

1 failures in 4528 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-release: 1

Platform breakdown:

• linux1804-64-shippable-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1569512&startday=2020-04-13&endday=2020-04-19&tree=all