1997218 - High frequency /encrypted-media/drm-events-session-closed-event.https.html | drm test MediaKeySession closed event. - assert_unreached: Error: InvalidStateError Reached unreachable code

Status: RESOLVED INCOMPLETE

(Core :: Audio/Video: Playback, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: ctuns [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=533551523&repo=mozilla-central&task=bfRl4PRQSrCAYJZSagoL-A.0
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/bfRl4PRQSrCAYJZSagoL-A/runs/0/artifacts/public/logs/live_backing.log

---

[task 2025-10-29T19:00:15.849+00:00] 19:00:15     INFO - TEST-START | /encrypted-media/drm-events-session-closed-event.https.html
[task 2025-10-29T19:00:15.855+00:00] 19:00:15     INFO - Closing window b1994320-a577-4e8c-b114-27ddca8b0726
[task 2025-10-29T19:00:15.987+00:00] 19:00:15     INFO - PID 7140 | console.error: services.settings:
[task 2025-10-29T19:00:15.987+00:00] 19:00:15     INFO - PID 7140 |   Message: Error: Unexpected content-type "text/plain;charset=US-ASCII"
[task 2025-10-29T19:00:15.988+00:00] 19:00:15     INFO - PID 7140 |   Stack:
[task 2025-10-29T19:00:15.988+00:00] 19:00:15     INFO - PID 7140 |     fetchLatestChanges@resource://services-settings/Utils.sys.mjs:445:13
[task 2025-10-29T19:00:19.393+00:00] 19:00:19     INFO - 
[task 2025-10-29T19:00:19.393+00:00] 19:00:19     INFO - TEST-UNEXPECTED-FAIL | /encrypted-media/drm-events-session-closed-event.https.html | drm test MediaKeySession closed event. - assert_unreached: Error: InvalidStateError Reached unreachable code
[task 2025-10-29T19:00:19.393+00:00] 19:00:19     INFO - runTest/</<@https://web-platform.test:8443/encrypted-media/scripts/events-session-closed-event.js:49:29
[task 2025-10-29T19:00:19.394+00:00] 19:00:19     INFO - TEST-OK | /encrypted-media/drm-events-session-closed-event.https.html | took 3545ms

Comment 1

[Cristian Tuns]

Hi :Jim , can you please take a look at this?
I am not sure about what bug caused this.
Backfills: https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&fromchange=d6da882bab5d08a78d4aa64ead4dbc2f83a31404&searchStr=windows%2C11%2C24h2%2Cshippable%2Copt%2Cweb%2Cplatform%2Ctests%2Cwith%2Cwindows%2Cmedia%2Cfoundation%2Cbased%2Ccdm%2Cenabled%2Cfor%2Ceme%2Cwpt%2Ctest-windows11-64-24h2-shippable%2Fopt-web-platform-tests-eme-emewmf%2Ceme&tochange=dc2df52a13068dda96abdc818cb3c10f58105708&selectedTaskRun=Audgk4zCROuxswVx7gjspw.0

Comment 2

[Intermittent Failures Robot]

12 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 10
• mozilla-central: 2

Table

	emewmf
windows11-x86_64/ccov	1
windows11-x86_64/debug	1
windows11-x86_64/opt	10

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2025-10-27&endday=2025-11-02&tree=all

Comment 3

[Intermittent Failures Robot]

5 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 3
• mozilla-central: 2

Table

	emewmf
windows11-x86_64/debug	1
windows11-x86_64/opt	4

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2025-12-15&endday=2025-12-21&tree=all

Comment 4

[Intermittent Failures Robot]

1 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Table

	emewmf
windows11-x86_64/opt	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2025-12-29&endday=2026-01-04&tree=all

Comment 5

[Intermittent Failures Robot]

1 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Table

	emewmf
windows11-x86_64/opt	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2026-02-16&endday=2026-02-22&tree=all

Comment 6

[Alastor Wu [:alwu]]

It has low error rate in the past month, I think it should keep as a backlog.

Comment 7

[BugBot [:suhaib / :marco]]

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit BugBot documentation.

Comment 8

[Treeherder Bug Filer]

New failure instance: https://treeherder.mozilla.org/logviewer?job_id=566910306&repo=mozilla-central

Comment 9

[Intermittent Failures Robot]

10 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 8
• mozilla-central: 2

Table

	emewmf
windows11-x86_64/ccov	2
windows11-x86_64/opt	8

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2026-05-11&endday=2026-05-17&tree=all

Comment 10

[Intermittent Failures Robot]

1 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Table

	emewmf
windows11-x86_64/opt	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2026-05-25&endday=2026-05-31&tree=all

Comment 11

[Intermittent Failures Robot]

1 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Table

	emewmf
windows11-x86_64/opt	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2026-06-08&endday=2026-06-14&tree=all

Comment 12

[Intermittent Failures Robot]

2 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 2

Table

	emewmf
windows11-x86_64/opt	2

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2026-06-22&endday=2026-06-28&tree=all

Comment 13

[Intermittent Failures Robot]

1 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Table

	emewmf
windows11-x86_64/opt	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2026-07-13&endday=2026-07-19&tree=all

Comment 14

[Intermittent Failures Robot]

1 failures were associated with this bug in the last 7 days.

Repository breakdown:

• mozilla-central: 1

Table

	emewmf
windows11-x86_64/opt	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2026-07-20&endday=2026-07-26&tree=all

Comment 15

[BugBot [:suhaib / :marco]]

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit BugBot documentation.

Comment 16

[Intermittent Failures Robot]

2 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 2

Table

	emewmf
windows11-x86_64/opt	2

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1997218&startday=2026-10-19&endday=2026-10-25&tree=all