1621231 - Intermittent test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.read_path_whitelist should be accessed at most 51 times. - 52 <= 51 - JS frame :: chrome://*/browser_preferences_usage.js :: checkPrefGetters :: line 63

Status: RESOLVED FIXED

(Firefox :: General, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: btara [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=292415800&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/CZpCjyntS5KeFU3VNNTZog/runs/0/artifacts/public/logs/live_backing.log

---

...
[task 2020-03-10T09:48:35.612Z] 09:48:35     INFO - Navigating to http://example.com/...
[task 2020-03-10T09:48:35.612Z] 09:48:35     INFO - Buffered messages logged at 09:48:33
[task 2020-03-10T09:48:35.612Z] 09:48:35     INFO - Loaded http://example.com/.
[task 2020-03-10T09:48:35.612Z] 09:48:35     INFO - Navigating to https://example.com/...
[task 2020-03-10T09:48:35.613Z] 09:48:35     INFO - Buffered messages logged at 09:48:34
[task 2020-03-10T09:48:35.613Z] 09:48:35     INFO - Loaded https://example.com/.
[task 2020-03-10T09:48:35.614Z] 09:48:35     INFO - network.loadinfo.skip_type_assertion should not be accessed more than 40 times and was accessed 165 times.
[task 2020-03-10T09:48:35.614Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item browser.zoom.full should be accessed at least 100 times. - 100 <= 103 - 
[task 2020-03-10T09:48:35.614Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item browser.zoom.full should be accessed at most 110 times. - 103 <= 110 - 
[task 2020-03-10T09:48:35.615Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.read_path_whitelist should be accessed at least 50 times. - 50 <= 52 - 
[task 2020-03-10T09:48:35.615Z] 09:48:35     INFO - Buffered messages finished
[task 2020-03-10T09:48:35.618Z] 09:48:35     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.read_path_whitelist should be accessed at most 51 times. - 52 <= 51 - JS frame :: chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js :: checkPrefGetters :: line 63
[task 2020-03-10T09:48:35.619Z] 09:48:35     INFO - Stack trace:
[task 2020-03-10T09:48:35.619Z] 09:48:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js:checkPrefGetters:63
[task 2020-03-10T09:48:35.619Z] 09:48:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js:navigate_around:267
[task 2020-03-10T09:48:35.619Z] 09:48:35     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest/<:1062
[task 2020-03-10T09:48:35.620Z] 09:48:35     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1097
[task 2020-03-10T09:48:35.621Z] 09:48:35     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:925
[task 2020-03-10T09:48:35.621Z] 09:48:35     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<:918
[task 2020-03-10T09:48:35.621Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.write_path_whitelist should be accessed at least 50 times. - 50 <= 52 - 
[task 2020-03-10T09:48:35.621Z] 09:48:35     INFO - Not taking screenshot here: see the one that was previously logged
[task 2020-03-10T09:48:35.621Z] 09:48:35     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.write_path_whitelist should be accessed at most 51 times. - 52 <= 51 - JS frame :: chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js :: checkPrefGetters :: line 63
[task 2020-03-10T09:48:35.621Z] 09:48:35     INFO - Stack trace:
[task 2020-03-10T09:48:35.622Z] 09:48:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js:checkPrefGetters:63
[task 2020-03-10T09:48:35.622Z] 09:48:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js:navigate_around:267
[task 2020-03-10T09:48:35.623Z] 09:48:35     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest/<:1062
[task 2020-03-10T09:48:35.623Z] 09:48:35     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1097
[task 2020-03-10T09:48:35.624Z] 09:48:35     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:925
[task 2020-03-10T09:48:35.624Z] 09:48:35     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<:918
[task 2020-03-10T09:48:35.625Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.force-namespace should be accessed at least 50 times. - 50 <= 52 - 
[task 2020-03-10T09:48:35.625Z] 09:48:35     INFO - Not taking screenshot here: see the one that was previously logged
[task 2020-03-10T09:48:35.626Z] 09:48:35     INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.force-namespace should be accessed at most 51 times. - 52 <= 51 - JS frame :: chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js :: checkPrefGetters :: line 63
[task 2020-03-10T09:48:35.626Z] 09:48:35     INFO - Stack trace:
[task 2020-03-10T09:48:35.627Z] 09:48:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js:checkPrefGetters:63
[task 2020-03-10T09:48:35.634Z] 09:48:35     INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js:navigate_around:267
[task 2020-03-10T09:48:35.635Z] 09:48:35     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest/<:1062
[task 2020-03-10T09:48:35.635Z] 09:48:35     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1097
[task 2020-03-10T09:48:35.635Z] 09:48:35     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:925
[task 2020-03-10T09:48:35.636Z] 09:48:35     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<:918
[task 2020-03-10T09:48:35.646Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item toolkit.cosmeticAnimations.enabled should be accessed at least 45 times. - 45 <= 50 - 
[task 2020-03-10T09:48:35.647Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item toolkit.cosmeticAnimations.enabled should be accessed at most 55 times. - 50 <= 55 - 
[task 2020-03-10T09:48:35.647Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item dom.ipc.processCount.webIsolated should be accessed at least 50 times. - 50 <= 50 - 
[task 2020-03-10T09:48:35.647Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item dom.ipc.processCount.webIsolated should be accessed at most 51 times. - 50 <= 51 - 
[task 2020-03-10T09:48:35.648Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item dom.ipc.keepProcessesAlive.webIsolated.perOrigin should be accessed at least 50 times. - 50 <= 50 - 
[task 2020-03-10T09:48:35.648Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item dom.ipc.keepProcessesAlive.webIsolated.perOrigin should be accessed at most 51 times. - 50 <= 51 - 
[task 2020-03-10T09:48:35.649Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | layout.css.dpi should not be accessed more than 40 times. - 18 <= 40 - 
[task 2020-03-10T09:48:35.649Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | browser.startup.record should not be accessed more than 40 times. - 10 <= 40 - 
[task 2020-03-10T09:48:35.649Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | browser.cache.disk.capacity should not be accessed more than 40 times. - 5 <= 40 - 
[task 2020-03-10T09:48:35.650Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | browser.privatebrowsing.autostart should not be accessed more than 40 times. - 4 <= 40 - 
[task 2020-03-10T09:48:35.650Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | dom.ipc.multiOptOut should not be accessed more than 40 times. - 3 <= 40 - 
[task 2020-03-10T09:48:35.655Z] 09:48:35     INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | dom.ipc.processCount should not be accessed more than 40 times. - 3 <= 40 - 
...

Comment 1

[Intermittent Failures Robot]

1 failures in 5336 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform breakdown:

• linux1804-64: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1621231&startday=2020-03-09&endday=2020-03-15&tree=all

Comment 2

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 1

Platform breakdown:

• linux1804-64: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1621231&startday=2020-03-23&endday=2020-03-29&tree=all

Comment 3

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 1

Platform breakdown:

• linux1804-64: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1621231&startday=2020-04-06&endday=2020-04-12&tree=all

Comment 4

[Intermittent Failures Robot]

1 failures in 5582 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform breakdown:

• windows10-64-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1621231&startday=2020-04-20&endday=2020-04-26&tree=all

Comment 5

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

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

Comment 6

[Razvan Maries]

New occurrence: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=304458191&repo=autoland&lineNumber=3719

Comment 7

[Intermittent Failures Robot]

1 failures in 5458 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Platform breakdown:

• linux1804-64: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1621231&startday=2020-05-25&endday=2020-05-31&tree=all

Comment 8

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

Does the threshold of allowed sandbox pref reads need an adjustment or should this be regarded as regression?

Comment 9

[Gian-Carlo Pascutto [:gcp]]

I honestly wouldn't even know why we're testing that.

Comment 10

[:Gijs (he/him)]

(In reply to Gian-Carlo Pascutto [:gcp] from comment #9)

why we're testing that.

Pref reads are not free, and StaticPrefs exists (and defineLazyPreferenceGetter in JS land) to reduce that cost for hot code. The test is meant to fail when people add expensive pref reads. There's a list of known issues, for which bugs are on file, which have lower and upper bounds associated with them so we notice if those issues go away or get worse. This failure indicates some of these prefs are now being accessed more often (albeit only slightly).

bug 1639242 recently touched this, but not recently enough to explain the timing of the spike in failures. If I had to guess, this is related to the preallocated fission process work jesup did, as the prefs are consulted when creating processes. All the failures are Fission-specific.

I think given the small difference, it's probably OK to increment the max to 52 or 55 or something without spending too much time trying to figure out the exact reason this has gone up by 1 or 2 - it'd be more useful to fix the underlying bugs, ie bug 1639494 and bug 1600189. Florian, does that sound right to you?

Comment 11

[Florian Quèze [:florian]]

(In reply to :Gijs (he/him) from comment #10)

I think given the small difference, it's probably OK to increment the max to 52 or 55 or something without spending too much time trying to figure out the exact reason this has gone up by 1 or 2 - it'd be more useful to fix the underlying bugs, ie bug 1639494 and bug 1600189. Florian, does that sound right to you?

Yes, that sounds right.

Note: there are also Windows failures where the test reports that we are accessing the preference less than we expect: "Whitelist item gfx.canvas.azure.backends should be accessed at least 100 times. - 100 <= 98"

Comment 12

[Jed Davis [:jld] ⟨⏰|UTC-8⟩ ⟦he/him⟧]

I have some refactoring I did as part of bug 1640345 that will cache more of the sandbox policy, including those prefs, so that should take care of this. (I plan to split it out into a separate bug and connect this one to it.)

Comment 13

[Intermittent Failures Robot]

30 failures in 4949 pushes (0.006 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:

• autoland: 26
• try: 1
• mozilla-central: 3

Platform breakdown:

• linux1804-64: 28
• windows10-64: 1
• windows10-64-qr: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1621231&startday=2020-06-01&endday=2020-06-07&tree=all

Comment 14

[Atila Butkovits]

In the past week there 38 failures on:
-linux1804-64 debug

Recent failure log:
https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=306247708&repo=autoland&lineNumber=4509

[task 2020-06-13T17:43:41.418Z] 17:43:41 INFO - Loaded http://example.org/.
[task 2020-06-13T17:43:41.419Z] 17:43:41 INFO - Navigating to https://example.org/...
[task 2020-06-13T17:43:41.419Z] 17:43:41 INFO - Buffered messages logged at 17:43:38
[task 2020-06-13T17:43:41.420Z] 17:43:41 INFO - Loaded https://example.org/.
[task 2020-06-13T17:43:41.420Z] 17:43:41 INFO - Navigating to http://example.com/...
[task 2020-06-13T17:43:41.421Z] 17:43:41 INFO - Buffered messages logged at 17:43:39
[task 2020-06-13T17:43:41.426Z] 17:43:41 INFO - Loaded http://example.com/.
[task 2020-06-13T17:43:41.426Z] 17:43:41 INFO - Navigating to https://example.com/...
[task 2020-06-13T17:43:41.426Z] 17:43:41 INFO - Buffered messages logged at 17:43:40
[task 2020-06-13T17:43:41.427Z] 17:43:41 INFO - Loaded https://example.com/.
[task 2020-06-13T17:43:41.427Z] 17:43:41 INFO - network.loadinfo.skip_type_assertion should not be accessed more than 40 times and was accessed 165 times.
[task 2020-06-13T17:43:41.428Z] 17:43:41 INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item browser.zoom.full should be accessed at least 100 times. - 100 <= 103 -
[task 2020-06-13T17:43:41.428Z] 17:43:41 INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item browser.zoom.full should be accessed at most 110 times. - 103 <= 110 -
[task 2020-06-13T17:43:41.429Z] 17:43:41 INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.read_path_whitelist should be accessed at least 50 times. - 50 <= 54 -
[task 2020-06-13T17:43:41.430Z] 17:43:41 INFO - Buffered messages finished
[task 2020-06-13T17:43:41.431Z] 17:43:41 INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.read_path_whitelist should be accessed at most 51 times. - 54 <= 51 - JS frame :: chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js :: checkPrefGetters :: line 63
[task 2020-06-13T17:43:41.431Z] 17:43:41 INFO - Stack trace:
[task 2020-06-13T17:43:41.432Z] 17:43:41 INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js:checkPrefGetters:63
[task 2020-06-13T17:43:41.433Z] 17:43:41 INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js:navigate_around:280
[task 2020-06-13T17:43:41.434Z] 17:43:41 INFO - chrome://mochikit/content/browser-test.js:Tester_execTest/<:1064
[task 2020-06-13T17:43:41.435Z] 17:43:41 INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1104
[task 2020-06-13T17:43:41.436Z] 17:43:41 INFO - chrome://mochikit/content/browser-test.js:nextTest/<:927
[task 2020-06-13T17:43:41.436Z] 17:43:41 INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<:918
[task 2020-06-13T17:43:41.437Z] 17:43:41 INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.write_path_whitelist should be accessed at least 50 times. - 50 <= 54 -
[task 2020-06-13T17:43:41.438Z] 17:43:41 INFO - Not taking screenshot here: see the one that was previously logged
[task 2020-06-13T17:43:41.439Z] 17:43:41 INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.write_path_whitelist should be accessed at most 51 times. - 54 <= 51 - JS frame :: chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js :: checkPrefGetters :: line 63
[task 2020-06-13T17:43:41.439Z] 17:43:41 INFO - Stack trace:
[task 2020-06-13T17:43:41.440Z] 17:43:41 INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js:checkPrefGetters:63
[task 2020-06-13T17:43:41.441Z] 17:43:41 INFO - chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js:navigate_around:280
[task 2020-06-13T17:43:41.442Z] 17:43:41 INFO - chrome://mochikit/content/browser-test.js:Tester_execTest/<:1064
[task 2020-06-13T17:43:41.442Z] 17:43:41 INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1104
[task 2020-06-13T17:43:41.443Z] 17:43:41 INFO - chrome://mochikit/content/browser-test.js:nextTest/<:927
[task 2020-06-13T17:43:41.444Z] 17:43:41 INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/waitForFocusInner/focusedOrLoaded/<:918
[task 2020-06-13T17:43:41.445Z] 17:43:41 INFO - TEST-PASS | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.force-namespace should be accessed at least 50 times. - 50 <= 54 -
[task 2020-06-13T17:43:41.445Z] 17:43:41 INFO - Not taking screenshot here: see the one that was previously logged
[task 2020-06-13T17:43:41.449Z] 17:43:41 INFO - TEST-UNEXPECTED-FAIL | browser/base/content/test/performance/browser_preferences_usage.js | Whitelist item security.sandbox.content.force-namespace should be accessed at most 51 times. - 54 <= 51 - JS frame :: chrome://mochitests/content/browser/browser/base/content/test/performance/browser_preferences_usage.js :: checkPrefGetters :: line 63

Justin, could you take a look?

Comment 15

[Intermittent Failures Robot]

43 failures in 5211 pushes (0.008 failures/push) were associated with this bug in the last 7 days.

This is the #38 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: 37
• try: 3
• mozilla-central: 3

Platform breakdown:

• linux1804-64: 43

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1621231&startday=2020-06-08&endday=2020-06-14&tree=all

Comment 16

[:Gijs (he/him)]

Attachment: Bug 1621231 - make sandbox prefs not trip browser_preferences_usage.js so much, r?florian

A longer-term fix is being worked on in bug 1644917, but this will make life easier for sheriffs and on try.

Comment 17

[:Gijs (he/him)]

I'll put up a patch to shut up the test failures while :jld gets a "real" fix together in bug 1644917.

Comment 18

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/f78c743cce37
make sandbox prefs not trip browser_preferences_usage.js so much, r=florian

Comment 19

[Cristina Coroiu [:ccoroiu]]

https://hg.mozilla.org/mozilla-central/rev/f78c743cce37

Comment 20

[Intermittent Failures Robot]

19 failures in 4035 pushes (0.005 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 11
• mozilla-central: 6
• try: 2

Platform breakdown:

• linux1804-64: 19

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1621231&startday=2020-06-15&endday=2020-06-21&tree=all

Comment 21

[:Gijs (he/him)]

The intermittent is fixed, so I guess we can close this.

Comment 24

[Jed Davis [:jld] ⟨⏰|UTC-8⟩ ⟦he/him⟧]

Instances of this since 2020-05-30 were probably caused by bug 1602757 (preallocated content processes for Fission) increasing the number of process launches by O(1).