Intermittent dom/ipc/tests/test_child_docshell.html | Test timed out.

NEW
Unassigned

Status

()

Core
IPC
2 years ago
3 days ago

People

(Reporter: Treeherder Bug Filer, Unassigned, NeedInfo)

Tracking

({intermittent-failure})

Firefox Tracking Flags

(Not tracked)

Details

(Whiteboard: [stockwell needswork:owner])

Comment 1

2 years ago
Bulk assigning P3 to all open intermittent bugs without a priority set in Firefox components per bug 1298978.
Priority: -- → P3

Comment 2

2 years ago
8 automation job failures were associated with this bug in the last 7 days.

Repository breakdown:
* mozilla-inbound: 8

Platform breakdown:
* android-4-3-armv7-api15: 8

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2016-08-29&endday=2016-09-04&tree=all

Comment 3

a year ago
5 failures in 770 pushes (0.006 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* mozilla-inbound: 3
* autoland: 2

Platform breakdown:
* linux64: 4
* android-4-3-armv7-api15: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-05-01&endday=2017-05-07&tree=all

Comment 4

11 months ago
13 failures in 879 pushes (0.015 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* mozilla-inbound: 5
* try: 4
* autoland: 3
* mozilla-central: 1

Platform breakdown:
* linux64: 8
* android-4-3-armv7-api15: 4
* osx-10-10: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-05-08&endday=2017-05-14&tree=all

Comment 5

11 months ago
7 failures in 820 pushes (0.009 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* mozilla-inbound: 2
* mozilla-central: 2
* autoland: 2
* graphics: 1

Platform breakdown:
* linux64: 5
* android-4-3-armv7-api15: 2

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-05-29&endday=2017-06-04&tree=all

Comment 6

10 months ago
7 failures in 864 pushes (0.008 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* mozilla-inbound: 3
* try: 2
* mozilla-central: 1
* autoland: 1

Platform breakdown:
* linux64: 6
* windows7-32-vm: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-06-05&endday=2017-06-11&tree=all

Comment 7

10 months ago
17 failures in 814 pushes (0.021 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* autoland: 8
* mozilla-inbound: 6
* try: 1
* mozilla-central: 1
* mozilla-beta: 1

Platform breakdown:
* linux64: 8
* linux32: 6
* android-4-3-armv7-api15: 2
* windows7-32-vm: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-06-12&endday=2017-06-18&tree=all

Comment 8

10 months ago
11 failures in 892 pushes (0.012 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* mozilla-inbound: 4
* mozilla-central: 4
* mozilla-beta: 2
* autoland: 1

Platform breakdown:
* linux32: 5
* linux64: 4
* linux64-ccov: 1
* android-4-3-armv7-api15: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-06-19&endday=2017-06-25&tree=all

Comment 9

10 months ago
7 failures in 718 pushes (0.01 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* autoland: 3
* mozilla-inbound: 2
* mozilla-central: 1
* mozilla-beta: 1

Platform breakdown:
* linux32: 3
* linux64: 2
* android-4-3-armv7-api15: 2

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-06-26&endday=2017-07-02&tree=all

Comment 10

10 months ago
8 failures in 656 pushes (0.012 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* autoland: 6
* mozilla-inbound: 2

Platform breakdown:
* linux64: 6
* linux32: 1
* android-4-3-armv7-api15: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-07-03&endday=2017-07-09&tree=all

Comment 11

9 months ago
15 failures in 720 pushes (0.021 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* autoland: 5
* mozilla-inbound: 3
* mozilla-beta: 3
* try: 2
* pine: 1
* mozilla-central: 1

Platform breakdown:
* linux64: 7
* android-4-3-armv7-api15: 6
* linux32: 2

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-07-10&endday=2017-07-16&tree=all

Comment 12

9 months ago
4 failures in 822 pushes (0.005 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* mozilla-inbound: 2
* try: 1
* mozilla-beta: 1

Platform breakdown:
* linux32: 2
* linux64: 1
* android-4-3-armv7-api15: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-07-17&endday=2017-07-23&tree=all

Comment 13

9 months ago
20 failures in 1008 pushes (0.02 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* pine: 9
* autoland: 4
* try: 2
* mozilla-inbound: 2
* mozilla-beta: 2
* mozilla-central: 1

Platform breakdown:
* windows7-32: 10
* windows10-64: 4
* linux32: 4
* linux64: 2

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-07-24&endday=2017-07-30&tree=all

Comment 14

9 months ago
6 failures in 888 pushes (0.007 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* autoland: 5
* try: 1

Platform breakdown:
* windows7-32: 5
* linux32: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-07-31&endday=2017-08-06&tree=all

Comment 15

8 months ago
6 failures in 901 pushes (0.007 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* autoland: 3
* try: 1
* mozilla-release: 1
* mozilla-inbound: 1

Platform breakdown:
* linux32: 3
* windows7-32: 1
* linux64-stylo: 1
* linux64: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-08-07&endday=2017-08-13&tree=all

Comment 16

8 months ago
13 failures in 949 pushes (0.014 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* autoland: 9
* mozilla-central: 2
* mozilla-inbound: 1
* mozilla-beta: 1

Platform breakdown:
* linux64-stylo: 3
* android-4-3-armv7-api15: 3
* windows7-32: 2
* linux64: 2
* linux32: 2
* linux64-stylo-sequential: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-08-14&endday=2017-08-20&tree=all

Comment 17

8 months ago
10 failures in 908 pushes (0.011 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* autoland: 6
* mozilla-inbound: 2
* mozilla-release: 1
* mozilla-beta: 1

Platform breakdown:
* windows7-32: 5
* linux64-stylo-sequential: 2
* linux64-stylo: 1
* linux32: 1
* android-4-3-armv7-api15: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-08-21&endday=2017-08-27&tree=all

Comment 18

8 months ago
15 failures in 939 pushes (0.016 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* autoland: 5
* mozilla-inbound: 4
* mozilla-central: 3
* try: 2
* mozilla-beta: 1

Platform breakdown:
* linux32-stylo: 4
* linux32: 4
* android-4-3-armv7-api16: 2
* windows7-32-devedition: 1
* windows7-32: 1
* linux64-stylo-sequential: 1
* linux64-stylo: 1
* linux64: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-08-28&endday=2017-09-03&tree=all

Comment 19

7 months ago
4 failures in 924 pushes (0.004 failures/push) were associated with this bug in the last 7 days.   

Repository breakdown:
* autoland: 3
* mozilla-beta: 1

Platform breakdown:
* android-4-3-armv7-api16: 3
* linux32: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-09-04&endday=2017-09-10&tree=all
Bulk priority update of open intermittent test failure bugs. 

P3 => P5

https://bugzilla.mozilla.org/show_bug.cgi?id=1381960
Priority: P3 → P5

Comment 21

7 months ago
20 failures in 1032 pushes (0.019 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* autoland: 7
* mozilla-inbound: 5
* try: 3
* mozilla-central: 3
* mozilla-release: 1
* mozilla-beta: 1

Platform breakdown:
* linux32: 10
* linux32-stylo-disabled: 4
* android-4-3-armv7-api16: 3
* linux64: 2
* windows10-64: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-09-11&endday=2017-09-17&tree=all

Comment 22

7 months ago
3 failures in 943 pushes (0.003 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* autoland: 2
* mozilla-beta: 1

Platform breakdown:
* linux64: 2
* linux32-stylo-disabled: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-09-18&endday=2017-09-24&tree=all

Comment 23

7 months ago
2 failures in 885 pushes (0.002 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-beta: 1
* autoland: 1

Platform breakdown:
* linux32-stylo-disabled: 1
* android-4-3-armv7-api16: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-09-25&endday=2017-10-01&tree=all

Comment 24

6 months ago
13 failures in 824 pushes (0.016 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* autoland: 7
* mozilla-inbound: 3
* try: 1
* mozilla-central: 1
* mozilla-beta: 1

Platform breakdown:
* linux32: 5
* linux32-stylo-disabled: 4
* linux64: 2
* windows10-64: 1
* android-4-3-armv7-api16: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-10-02&endday=2017-10-08&tree=all
Duplicate of this bug: 1406593

Comment 26

6 months ago
7 failures in 947 pushes (0.007 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-beta: 2
* autoland: 2
* try: 1
* mozilla-inbound: 1
* mozilla-central: 1

Platform breakdown:
* linux32: 4
* linux32-stylo-disabled: 2
* linux64-stylo-disabled: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-10-09&endday=2017-10-15&tree=all

Comment 27

6 months ago
2 failures in 864 pushes (0.002 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* try: 1
* mozilla-beta: 1

Platform breakdown:
* windows10-64-devedition: 1
* linux64-qr: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-10-16&endday=2017-10-22&tree=all

Comment 28

6 months ago
3 failures in 912 pushes (0.003 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* try: 1
* mozilla-inbound: 1
* autoland: 1

Platform breakdown:
* linux64: 2
* windows10-64-devedition: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-10-23&endday=2017-10-29&tree=all

Comment 29

6 months ago
5 failures in 857 pushes (0.006 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-central: 2
* try: 1
* mozilla-beta: 1
* autoland: 1

Platform breakdown:
* windows10-64-nightly: 4
* windows10-64: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-10-30&endday=2017-11-05&tree=all

Comment 30

5 months ago
5 failures in 849 pushes (0.006 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-release: 2
* mozilla-central: 2
* mozilla-inbound: 1

Platform breakdown:
* windows10-64: 3
* linux32-stylo-disabled: 2

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-11-06&endday=2017-11-12&tree=all

Comment 31

5 months ago
3 failures in 762 pushes (0.004 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-inbound: 1
* mozilla-central: 1
* autoland: 1

Platform breakdown:
* linux64-ccov: 1
* linux32-stylo-disabled: 1
* linux32: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-11-13&endday=2017-11-19&tree=all

Comment 32

5 months ago
10 failures in 744 pushes (0.013 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* autoland: 4
* mozilla-release: 2
* mozilla-central: 2
* mozilla-inbound: 1
* mozilla-beta: 1

Platform breakdown:
* windows10-64: 4
* linux32: 2
* windows10-64-nightly: 1
* windows10-64-devedition: 1
* linux64-ccov: 1
* android-4-3-armv7-api16: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-11-20&endday=2017-11-26&tree=all

Comment 33

5 months ago
2 failures in 792 pushes (0.003 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-release: 1
* autoland: 1

Platform breakdown:
* windows10-64: 1
* linux32: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-11-27&endday=2017-12-03&tree=all

Comment 34

4 months ago
1 failures in 889 pushes (0.001 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://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-12-04&endday=2017-12-10&tree=all

Comment 35

4 months ago
5 failures in 590 pushes (0.008 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* try: 2
* mozilla-inbound: 1
* mozilla-beta: 1
* autoland: 1

Platform breakdown:
* windows10-64-devedition: 2
* windows10-64-nightly: 1
* windows10-64: 1
* android-4-3-armv7-api16: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2017-12-18&endday=2017-12-24&tree=all

Comment 36

3 months ago
1 failures in 462 pushes (0.002 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-release: 1

Platform breakdown:
* linux32-stylo-disabled: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-01-01&endday=2018-01-07&tree=all

Comment 37

3 months ago
1 failures in 788 pushes (0.001 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* autoland: 1

Platform breakdown:
* windows10-64: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-01-08&endday=2018-01-14&tree=all

Comment 38

3 months ago
1 failures in 657 pushes (0.002 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-central: 1

Platform breakdown:
* linux32: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-01-15&endday=2018-01-21&tree=all

Comment 39

3 months ago
2 failures in 701 pushes (0.003 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* try: 1
* mozilla-beta: 1

Platform breakdown:
* windows10-64-devedition: 1
* windows10-64: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-01-22&endday=2018-01-28&tree=all

Comment 40

3 months ago
1 failures in 735 pushes (0.001 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* autoland: 1

Platform breakdown:
* linux32: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-01-29&endday=2018-02-04&tree=all

Comment 41

2 months ago
1 failures in 702 pushes (0.001 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-inbound: 1

Platform breakdown:
* windows10-64: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-02-05&endday=2018-02-11&tree=all

Comment 42

2 months ago
7 failures in 685 pushes (0.01 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* autoland: 4
* mozilla-inbound: 3

Platform breakdown:
* windows10-64: 4
* android-4-3-armv7-api16: 3

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-02-12&endday=2018-02-18&tree=all

Comment 43

2 months ago
4 failures in 675 pushes (0.006 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-central: 2
* mozilla-inbound: 1
* autoland: 1

Platform breakdown:
* windows10-64: 2
* windows10-64-nightly: 1
* linux64-ccov: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-02-19&endday=2018-02-25&tree=all

Comment 44

2 months ago
12 failures in 831 pushes (0.014 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* try: 6
* mozilla-beta: 2
* autoland: 2
* mozilla-inbound: 1
* mozilla-central: 1

Platform breakdown:
* windows10-64-devedition: 3
* windows10-64: 3
* windows7-32-devedition: 2
* windows10-64-nightly: 2
* windows7-32: 1
* linux32-stylo-disabled: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-02-26&endday=2018-03-04&tree=all

Comment 45

a month ago
3 failures in 747 pushes (0.004 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-release: 1
* mozilla-inbound: 1
* mozilla-beta: 1

Platform breakdown:
* windows10-64-nightly: 2
* windows10-64: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-03-05&endday=2018-03-11&tree=all

Comment 46

a month ago
12 failures in 814 pushes (0.015 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* try: 4
* mozilla-inbound: 4
* mozilla-central: 2
* mozilla-beta: 2

Platform breakdown:
* windows7-32-nightly: 4
* windows10-64: 4
* linux64-ccov: 2
* windows7-32-devedition: 1
* windows10-64-devedition: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1283714&startday=2018-03-12&endday=2018-03-18&tree=all

Comment 47

24 days ago
11 failures in 822 pushes (0.013 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-beta: 4
* autoland: 4
* mozilla-inbound: 2
* mozilla-central: 1

Platform breakdown:
* windows10-64: 7
* windows7-32-nightly: 2
* windows10-64-nightly: 1
* windows10-64-devedition: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1283714&startday=2018-03-20&endday=2018-03-26&tree=trunk

Comment 48

19 days ago
20 failures in 718 pushes (0.028 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-beta: 8
* try: 5
* mozilla-inbound: 5
* mozilla-central: 1
* autoland: 1

Platform breakdown:
* windows10-64: 6
* windows7-32-nightly: 3
* windows7-32: 3
* windows10-64-nightly: 3
* windows10-64-devedition: 3
* windows7-32-devedition: 1
* linux64-ccov: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1283714&startday=2018-03-26&endday=2018-04-01&tree=trunk

Comment 49

12 days ago
32 failures in 765 pushes (0.042 failures/push) were associated with this bug in the last 7 days.   

** This failure happened more than 30 times this week! Resolving this bug is a high priority. **

** Try to resolve this bug as soon as possible. If unresolved for 2 weeks, the affected test(s) may be disabled. **  

Repository breakdown:
* mozilla-inbound: 14
* try: 5
* mozilla-central: 5
* mozilla-beta: 4
* autoland: 4

Platform breakdown:
* windows10-64: 17
* windows7-32: 4
* windows7-32-nightly: 3
* windows10-64-devedition: 3
* linux64-ccov: 3
* windows10-64-nightly: 2

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1283714&startday=2018-04-02&endday=2018-04-08&tree=trunk
Priority: P5 → --
Whiteboard: [stockwell needswork:owner]
Alexandre, any idea what might be going on with this? Failing pretty regularly on trunk and beta right now.
Flags: needinfo?(poirot.alex)
No idea, but here is a try with additional logs to see if DOMWindowCreated event is really not firing:
  https://treeherder.mozilla.org/#/jobs?repo=try&revision=2ba408d5a581c71cb5315728a5b9bb74c5b9d136
(In reply to Alexandre Poirot [:ochameau] from comment #51)
> No idea, but here is a try with additional logs to see if DOMWindowCreated
> event is really not firing:
>  
> https://treeherder.mozilla.org/#/
> jobs?repo=try&revision=2ba408d5a581c71cb5315728a5b9bb74c5b9d136

I'm not able to reproduce with additional logs.
So unless I don't run the right jobs (but it looks like it is failing on win10 opt, which I ran against), it looks like subtle race which isn't clear by just looking at the code.
29 failures in 792 pushes (0.037 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* autoland: 10
* mozilla-central: 7
* try: 5
* mozilla-inbound: 5
* mozilla-beta: 2

Platform breakdown:
* windows10-64: 22
* windows10-64-devedition: 2
* windows7-32-nightly: 1
* windows7-32-devedition: 1
* windows7-32: 1
* windows10-64-nightly: 1
* linux64-ccov: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1283714&startday=2018-04-09&endday=2018-04-15&tree=trunk
It seems to more readily reproduce on PGO builds. In fact, I got this on a new Try push [1] with your patch applied:
https://treeherder.mozilla.org/logviewer.html#?job_id=174257156&repo=try

Does that help?

[1] https://treeherder.mozilla.org/#/jobs?repo=try&revision=7218a2e3ce510f8b14712f455898627af6dea707
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