1996306 - Intermittent /storage-access-api/storage-access-headers.tentative.https.sub.window.html | single tracking bug

Status: ASSIGNED

(Core :: Privacy: Anti-Tracking, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: smolnar [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=532932044&repo=autoland&task=KkX5NP5KSCyXDnD0X4FRWg.0
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/KkX5NP5KSCyXDnD0X4FRWg/runs/0/artifacts/public/logs/live_backing.log

---

TEST-PASS | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Sec-Fetch-Storage-Access is `inactive` when unpartitioned cookies are available but not in use. 
[task 2025-10-24T15:22:50.215+00:00] 15:22:50     INFO - TEST-UNEXPECTED-FAIL | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Sec-Fetch-Storage-Access is `active` after a valid retry with matching explicit allowed-origin. - assert_array_equals: expected property 0 to be "cookie=unpartitioned" but got "cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar" (expected array ["cookie=unpartitioned"] got ["cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar"])
[task 2025-10-24T15:22:50.215+00:00] 15:22:50     INFO - assertHeaderValuesMatch@https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:65:28
[task 2025-10-24T15:22:50.215+00:00] 15:22:50     INFO - @https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:140:28
[task 2025-10-24T15:22:50.215+00:00] 15:22:50     INFO - 
[task 2025-10-24T15:22:50.215+00:00] 15:22:50     INFO - TEST-UNEXPECTED-FAIL | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Sec-Fetch-Storage-Access is active after retry with wildcard `allowed-origin` value. - assert_array_equals: expected property 0 to be "cookie=unpartitioned" but got "cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar" (expected array ["cookie=unpartitioned"] got ["cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar"])
[task 2025-10-24T15:22:50.215+00:00] 15:22:50     INFO - assertHeaderValuesMatch@https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:65:28
[task 2025-10-24T15:22:50.215+00:00] 15:22:50     INFO - @https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:165:28
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - .
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-PASS | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | 'Activate-Storage-Access: retry' is a no-op on a request from an origin that does not match its `allowed-origin` value. 
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-PASS | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Activate-Storage-Access `retry` is a no-op on a request with a `none` Storage Access status. 
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-PASS | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Activate-Storage-Access `load` header grants storage access to frame. 
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-PASS | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Activate-Storage-Access `load` is honored for `active` cases. 
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-PASS | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Activate-Storage-Access `load` header is a no-op for requests without storage access. 
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-PASS | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Sec-Fetch-Storage-Access is `inactive` for ABA case. 
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-PASS | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Storage Access can be activated for ABA cases by retrying. 
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-FAIL | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Sec-Fetch-Storage-Access maintains value on same-origin redirect. - assert_array_equals: expected property 0 to be "cookie=unpartitioned" but got "cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar" (expected array ["cookie=unpartitioned"] got ["cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar"])
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - assertHeaderValuesMatch@https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:65:28
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - @https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:363:28
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-FAIL | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Sec-Fetch-Storage-Access is not 'active' after cross-origin same-site redirection. - assert_array_equals: expected property 0 to be "cookie=unpartitioned" but got "cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar" (expected array ["cookie=unpartitioned"] got ["cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar"])
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - assertHeaderValuesMatch@https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:65:28
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - @https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:402:28
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-FAIL | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Sec-Fetch-Storage-Access loses value on a cross-site redirection. - assert_array_equals: expected property 0 to be "cookie=unpartitioned" but got "cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar" (expected array ["cookie=unpartitioned"] got ["cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar"])
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - assertHeaderValuesMatch@https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:65:28
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - @https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:440:28
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - TEST-UNEXPECTED-FAIL | /storage-access-api/storage-access-headers.tentative.https.sub.window.html | Activate-Storage-Access retry is handled before any redirects are followed. - assert_array_equals: expected property 0 to be "cookie=unpartitioned" but got "cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar" (expected array ["cookie=unpartitioned"] got ["cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar"])
[task 2025-10-24T15:22:50.222+00:00] 15:22:50     INFO - assertHeaderValuesMatch@https://web-platform.test:8443/storage-access-api/storage-access-headers.tentative.https.sub.window.js:65:28

Comment 1

[Manuel Bucher [:manuel]]

What platform does this test run on? Is it a nofis test?

Comment 2

[Sandor Molnar[:smolnar]]

(In reply to Manuel Bucher [:manuel] from comment #1)

What platform does this test run on? Is it a nofis test?

here you can see all the platforms on which it fails
from what I see there's no nofist test

Comment 3

[Manuel Bucher [:manuel]]

Thanks. Missed the link in the bug details.

The android is implicitly nofis. But seems to also fail on -nav

Comment 4

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 17

Table

	!fission	nav	navigationApi	no_variant	nofis	nofis-noship
android-x86/debug						1
android-x86/opt					4	1
linux2404-x86_64/debug		11

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2025-10-20&endday=2025-10-26&tree=all

Comment 5

[Intermittent Failures Robot]

54 failures were associated with this bug in the last 7 days.
This is the #43 most frequent failure this week.

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:

• autoland: 38
• mozilla-central: 10
• try: 6

Table

	no_variant	nofis	nofis-noship
android-x86/debug		6	8
android-x86/opt		19	20
linux1804-x86_64/tsan	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2025-10-27&endday=2025-11-02&tree=all

Comment 6

[Manuel Bucher [:manuel]]

@bas, I've heard that you've investigated some fis vs no-fis differences in cookie handling. Do you have insights into why we have more cookies available in the nofis case?

relevant line is

Sec-Fetch-Storage-Access [...]. - assert_array_equals: expected property 0 to be "cookie=unpartitioned" but got "cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar" (expected array ["cookie=unpartitioned"] got ["cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar"]

It seems like we have more cookies than we expect when loading with storage-access active.

Comment 7

[Intermittent Failures Robot]

30 failures 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:

• autoland: 20
• mozilla-central: 6
• try: 4

Table

	no_variant	nofis	nofis-noship
android-x86/debug		5	4
android-x86/opt		9	12

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2025-11-03&endday=2025-11-09&tree=all

Comment 8

[Bas Schouten (:bas.schouten)]

(In reply to Manuel Bucher [:manuel] from comment #6)

@bas, I've heard that you've investigated some fis vs no-fis differences in cookie handling. Do you have insights into why we have more cookies available in the nofis case?

relevant line is

Sec-Fetch-Storage-Access [...]. - assert_array_equals: expected property 0 to be "cookie=unpartitioned" but got "cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar" (expected array ["cookie=unpartitioned"] got ["cookie=unpartitioned; initial-cookie=unpartitioned; foo=bar"]

It seems like we have more cookies than we expect when loading with storage-access active.

I don't know where you heard that but I have no relevant expertise to offer whatsoever I'm afraid :-).

Comment 9

[Manuel Bucher [:manuel]]

Oh no, sorry for needinfoing you, bas. I was confusing you with baku. So sorry that needinfoed you to a completely unrelated bug to you 🙇.

Comment 10

[Manuel Bucher [:manuel]]

@baku: (See comment 6) Hi baku, sorry for needinfo, but do you have insights into fis vs nofis cookie handling that could lead us to more (unexpected) unpartitioned cookies in the fission case?

Comment 11

[Andrea Marchesini [:baku]]

I don't know about this particular wpt, but what I see is that we have cookie left from a previous test. In the log I see that there are 2 extra cookies:

• initial-cookie - from some of the requestStorageAcces-* cookies in that folder.
• foo=bar - requestStorageAccess-cross-site-sibling-iframes.sub.https.window.js

I saw in the past WPTs unable to cleanup cookies properly before of the execution of other tests.

Comment 12

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 5
• try: 1
• mozilla-central: 1

Table

	no_variant	nofis
android-x86/debug		7

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2025-11-10&endday=2025-11-16&tree=all

Comment 13

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 4
• try: 1

Table

	no_variant	nofis
android-x86/debug		5

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2025-11-17&endday=2025-11-23&tree=all

Comment 14

[Manuel Bucher [:manuel]]

Attachment: Bug 1996306 - [marionette] Fix clearAllCookies not clearing partitioned cookies

Comment 15

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 5

Table

	!fission	no_variant
linux2404-x86_64/tsan		5

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-01-05&endday=2026-01-11&tree=all

Comment 16

[Intermittent Failures Robot]

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

Repository breakdown:

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

Table

	no_variant
macosx1470-x86_64/opt	1
windows11-x86/debug	2
windows11-x86_64/debug	6

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-01-12&endday=2026-01-18&tree=all

Comment 17

[Intermittent Failures Robot]

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

Repository breakdown:

• try: 3
• autoland: 8
• mozilla-beta: 2
• mozilla-central: 2

Table

	no_variant
windows11-x86/debug	8
windows11-x86_64/debug	7

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-01-19&endday=2026-01-25&tree=all

Comment 18

[Intermittent Failures Robot]

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

Repository breakdown:

• mozilla-beta: 2
• autoland: 5
• mozilla-central: 2

Table

	no_variant
windows11-x86/debug	1
windows11-x86_64/debug	8

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-01-26&endday=2026-02-01&tree=all

Comment 19

[amarc]

hey sasha, could you please take a look at this recent spike in failures? it's caused by Bug 2013824

Push with examples
Failure log

Comment 20

[Alexandra Borovova [:Sasha]]

Attachment: Bug 1996306 - Update metadata for storage-access-api/storage-access-headers.tentative.https.sub.window.js.

Comment 21

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/97f1415ea8c6
https://hg.mozilla.org/integration/autoland/rev/61c82fa890dd
Update metadata for storage-access-api/storage-access-headers.tentative.https.sub.window.js.

Comment 22

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/61c82fa890dd

Comment 23

[Intermittent Failures Robot]

42 failures 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:

• autoland: 27
• mozilla-central: 8
• try: 7

Table

	!fission	no_variant	nofis	nofis-noship
android-x86_64/debug			3	4
linux2404-x86_64/tsan		35

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-02-02&endday=2026-02-08&tree=all

Comment 24

[Intermittent Failures Robot]

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

Repository breakdown:

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

Table

	!fission	no_variant	nofis-noship
android-x86_64/debug			2
linux2404-x86_64/ccov		1
linux2404-x86_64/tsan		3

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-02-09&endday=2026-02-15&tree=all

Comment 25

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 4

Table

	no_variant	nofis-noship
android-x86_64/debug		4

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-02-16&endday=2026-02-22&tree=all

Comment 26

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 1

Table

	nofis-noship
android-x86_64/debug	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-02-23&endday=2026-03-01&tree=all

Comment 27

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 1

Table

	no_variant	nofis-noship
android-x86_64/debug		1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-03-02&endday=2026-03-08&tree=all

Comment 28

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 16
• mozilla-central: 5
• try: 1

Table

	!fission	no_variant	nofis	nofis-noship
android-x86_64/debug				6
linux2404-x86_64/asan			2
linux2404-x86_64/tsan		14

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-03-09&endday=2026-03-15&tree=all

Comment 29

[Intermittent Failures Robot]

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

Repository breakdown:

• try: 1
• mozilla-central: 5

Table

	!fission	no_variant	nofis
linux2404-x86_64/asan			2
macosx1500-aarch64/opt		4

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-03-16&endday=2026-03-22&tree=all

Comment 30

[Intermittent Failures Robot]

18 failures were associated with this bug yesterday.

Repository breakdown:

• autoland: 12
• mozilla-central: 4
• mozilla-beta: 2

Table

	!fission	no_variant	nofis
android-x86_64/debug			14
linux2404-x86_64/asan			2
macosx1500-aarch64/opt		2

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-03-26&endday=2026-03-26&tree=all

Comment 31

[Intermittent Failures Robot]

57 failures 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:

• autoland: 41
• mozilla-central: 8
• mozilla-beta: 8

Table

	!fission	no_variant	nofis	nofis-cf
android-x86_64/debug			41	1
linux2404-x86_64/asan			4
linux2404-x86_64/tsan		2
macosx1500-aarch64/opt		9

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1996306&startday=2026-03-23&endday=2026-03-29&tree=all