1959062 - Intermittent devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | single tracking bug

Status: RESOLVED FIXED

(DevTools :: Debugger, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: amarc [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=502895083&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/NwNeOQ5BQZCymu8rtcy-Rg/runs/0/artifacts/public/logs/live_backing.log

---

[task 2025-04-08T08:44:22.905Z] 08:44:22     INFO - TEST-PASS | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | client is not paused - 
[task 2025-04-08T08:44:22.905Z] 08:44:22     INFO - Check that breakpoint can be set on "beforeUnload" event
[task 2025-04-08T08:44:22.906Z] 08:44:22     INFO - Expand Load and wait for the sub list to be displayed
[task 2025-04-08T08:44:22.906Z] 08:44:22     INFO - Toggle event.load.beforeunload breakpoint
[task 2025-04-08T08:44:22.907Z] 08:44:22     INFO - Wait for the event breakpoint checkbox to be toggled
[task 2025-04-08T08:44:22.907Z] 08:44:22     INFO - Waiting for the debugger to pause
[task 2025-04-08T08:44:22.907Z] 08:44:22     INFO - Waiting for state change: paused
[task 2025-04-08T08:44:22.908Z] 08:44:22     INFO - Navigating to "https://example.com/browser/devtools/client/debugger/test/mochitest/examples/doc-event-breakpoints.html"
[task 2025-04-08T08:44:22.909Z] 08:44:22     INFO - Waiting for page to be loaded…
[task 2025-04-08T08:44:22.909Z] 08:44:22     INFO - Console message: [JavaScript Warning: "debuggee 'https://example.com/browser/devtools/client/debugger/test/mochitest/examples/event-breakpoints.js:77' would run" {file: "resource://devtools/server/actors/utils/event-loop.js" line: 82}]
[task 2025-04-08T08:44:22.910Z] 08:44:22     INFO - Buffered messages logged at 08:43:15
[task 2025-04-08T08:44:22.910Z] 08:44:22     INFO - Console message: [JavaScript Error: "Error: DebuggerContextError: Selected frame changed" {file: "resource://devtools/client/debugger/src/utils/context.js" line: 46}]
[task 2025-04-08T08:44:22.911Z] 08:44:22     INFO - Console message: [JavaScript Error: "Error: DebuggerContextError: Selected frame changed" {file: "resource://devtools/client/debugger/src/utils/context.js" line: 46}]
[task 2025-04-08T08:44:22.911Z] 08:44:22     INFO - → page loaded
[task 2025-04-08T08:44:22.911Z] 08:44:22     INFO - Wait for the toolbox to reload
[task 2025-04-08T08:44:22.912Z] 08:44:22     INFO - Waiting for toolbox commands to be reloaded…
[task 2025-04-08T08:44:22.912Z] 08:44:22     INFO - Waiting for target switch…
[task 2025-04-08T08:44:22.913Z] 08:44:22     INFO - → switched-target emitted
[task 2025-04-08T08:44:22.913Z] 08:44:22     INFO - Waiting for 'dom-complete' resource…
[task 2025-04-08T08:44:22.914Z] 08:44:22     INFO - → 'dom-complete' resource emitted
[task 2025-04-08T08:44:22.914Z] 08:44:22     INFO - Waiting for jsdebugger to be reloaded…
[task 2025-04-08T08:44:22.914Z] 08:44:22     INFO - Waiting for jsdebugger updates after page reload
[task 2025-04-08T08:44:22.915Z] 08:44:22     INFO - → panel reloaded
[task 2025-04-08T08:44:22.915Z] 08:44:22     INFO - Wait for Responsive UI to reload
[task 2025-04-08T08:44:22.916Z] 08:44:22     INFO - Buffered messages finished
[task 2025-04-08T08:44:22.916Z] 08:44:22     INFO - TEST-UNEXPECTED-FAIL | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | Test timed out - 
[task 2025-04-08T08:44:22.917Z] 08:44:22     INFO - GECKO(1434) | Completed ShutdownLeaks collections in process 1434
[task 2025-04-08T08:44:22.917Z] 08:44:22     INFO - TEST-START | Shutdown
[task 2025-04-08T08:44:22.918Z] 08:44:22     INFO - Browser Chrome Test Summary
[task 2025-04-08T08:44:22.918Z] 08:44:22     INFO - Passed:  1579
[task 2025-04-08T08:44:22.919Z] 08:44:22     INFO - Failed:  1
[task 2025-04-08T08:44:22.919Z] 08:44:22     INFO - Todo:    0
[task 2025-04-08T08:44:22.920Z] 08:44:22     INFO - Mode:    e10s
[task 2025-04-08T08:44:22.920Z] 08:44:22     INFO - *** End BrowserChrome Test Results ***
[task 2025-04-08T08:44:23.579Z] 08:44:23     INFO - Finished waiting for state change: paused
[task 2025-04-08T08:44:23.585Z] 08:44:23     INFO - Finished waiting for state change: paused
[task 2025-04-08T08:44:23.585Z] 08:44:23     INFO - Waiting for state change: fetched frames
[task 2025-04-08T08:44:23.586Z] 08:44:23     INFO - --> The state was immediately correct (should rather do an immediate assertion?)
[task 2025-04-08T08:44:23.602Z] 08:44:23     INFO - Waiting for state change: selected source
[task 2025-04-08T08:44:23.603Z] 08:44:23     INFO - --> The state was immediately correct (should rather do an immediate assertion?)
[task 2025-04-08T08:44:23.606Z] 08:44:23     INFO - Waiting for state change: 
[task 2025-04-08T08:44:23.606Z] 08:44:23     INFO - --> The state was immediately correct (should rather do an immediate assertion?)
[task 2025-04-08T08:44:23.607Z] 08:44:23     INFO - TEST-PASS | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | client is paused - 
[task 2025-04-08T08:44:23.607Z] 08:44:23     INFO - TEST-PASS | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | top frame's source is selected - 
[task 2025-04-08T08:44:23.608Z] 08:44:23     INFO - TEST-PASS | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | Redux state for currently selected frame's line is correct - 
[task 2025-04-08T08:44:23.835Z] 08:44:23     INFO - GECKO(1434) | 1744101863834	Marionette	TRACE	Received observer notification quit-application
[task 2025-04-08T08:44:23.836Z] 08:44:23     INFO - GECKO(1434) | 1744101863835	Marionette	INFO	Stopped listening on port 2828
[task 2025-04-08T08:44:23.843Z] 08:44:23     INFO - GECKO(1434) | 1744101863842	Marionette	DEBUG	Marionette stopped listening
[task 2025-04-08T08:44:24.761Z] 08:44:24     INFO - GECKO(1434) | [Parent 1434: Main Thread]: I/DocShellAndDOMWindowLeak --DOCSHELL 1458cb000 == 6 [pid = 1434] [id = 2] [url = chrome://extensions/content/dummy.xhtml]
[task 2025-04-08T08:44:24.887Z] 08:44:24     INFO - GECKO(1434) | JavaScript error: , line 0: NotFoundError: No such JSProcessActor 'DevToolsProcess'
[task 2025-04-08T08:44:24.890Z] 08:44:24     INFO - GECKO(1434) | JavaScript error: , line 0: NotFoundError: No such JSProcessActor 'DevToolsProcess'
[task 2025-04-08T08:44:24.890Z] 08:44:24     INFO - GECKO(1434) | JavaScript error: , line 0: NotFoundError: No such JSProcessActor 'DevToolsProcess'
[task 2025-04-08T08:44:24.891Z] 08:44:24     INFO - GECKO(1434) | JavaScript error: , line 0: NotFoundError: No such JSProcessActor 'DevToolsProcess'
[task 2025-04-08T08:44:24.895Z] 08:44:24     INFO - GECKO(1434) | [Parent 1434, Main Thread] WARNING: NS_ENSURE_TRUE(mDoneSetup) failed: file /builds/worker/checkouts/gecko/editor/composer/nsEditingSession.cpp:1163
[task 2025-04-08T08:44:24.900Z] 08:44:24     INFO - GECKO(1434) | JavaScript error: , line 0: NotFoundError: No such JSProcessActor 'DevToolsProcess'
[task 2025-04-08T08:44:24.902Z] 08:44:24     INFO - TEST-PASS | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | Line 78 is not highlighted as paused - 
[task 2025-04-08T08:44:24.904Z] 08:44:24     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 37:9
[task 2025-04-08T08:44:24.905Z] 08:44:24     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1605:3
[task 2025-04-08T08:44:24.905Z] 08:44:24     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1643:9
[task 2025-04-08T08:44:24.906Z] 08:44:24     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1654:10
[task 2025-04-08T08:44:24.906Z] 08:44:24     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/shared-head.js @ 416:5
[task 2025-04-08T08:44:24.959Z] 08:44:24     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/shared-head.js @ 480:9
[task 2025-04-08T08:44:25.004Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js @ 223:9
[task 2025-04-08T08:44:25.047Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1170:26
[task 2025-04-08T08:44:25.047Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1242:18
[task 2025-04-08T08:44:25.061Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Saving scope variables as a JSON file: /opt/worker/tasks/task_174410042688531/build/blobber_upload_dir/scope-variables-1744101865060-browser_dbg-event-breakpoints.js_223_9.json
[task 2025-04-08T08:44:25.063Z] 08:44:25     INFO - Not taking screenshot here: see the one that was previously logged
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - TEST-UNEXPECTED-FAIL | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | There is only one line - Got +0, expected 1
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - Stack trace:
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:test_is:1654
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/shared-head.js:_assertDebugLine:416
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/shared-head.js:assertPausedAtSourceAndLine:480
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js:null:223
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:handleTask:1170
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1242
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1383
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:1159
[task 2025-04-08T08:44:25.064Z] 08:44:25     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1058
[task 2025-04-08T08:44:25.065Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 37:9
[task 2025-04-08T08:44:25.066Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1605:3
[task 2025-04-08T08:44:25.066Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1643:9
[task 2025-04-08T08:44:25.067Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1626:12
[task 2025-04-08T08:44:25.067Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/shared-head.js @ 423:5
[task 2025-04-08T08:44:25.110Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/shared-head.js @ 480:9
[task 2025-04-08T08:44:25.137Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js @ 223:9
[task 2025-04-08T08:44:25.162Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1170:26
[task 2025-04-08T08:44:25.162Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1242:18
[task 2025-04-08T08:44:25.175Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Saving scope variables as a JSON file: /opt/worker/tasks/task_174410042688531/build/blobber_upload_dir/scope-variables-1744101865174-browser_dbg-event-breakpoints.js_223_9.json
[task 2025-04-08T08:44:25.177Z] 08:44:25     INFO - Not taking screenshot here: see the one that was previously logged
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - TEST-UNEXPECTED-FAIL | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | debug line is visible - 
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - Stack trace:
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:test_ok:1626
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/shared-head.js:_assertDebugLine:423
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/shared-head.js:assertPausedAtSourceAndLine:480
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js:null:223
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:handleTask:1170
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1242
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1383
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:1159
[task 2025-04-08T08:44:25.179Z] 08:44:25     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1058
[task 2025-04-08T08:44:25.180Z] 08:44:25     INFO - TEST-PASS | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | Got the expected DebugLine. i.e. got the right marker in codemirror visualizing the breakpoint - 
[task 2025-04-08T08:44:25.180Z] 08:44:25     INFO - Paused on line 78
[task 2025-04-08T08:44:25.181Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 37:9
[task 2025-04-08T08:44:25.181Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1605:3
[task 2025-04-08T08:44:25.182Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1643:9
[task 2025-04-08T08:44:25.182Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1626:12
[task 2025-04-08T08:44:25.183Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/shared-head.js @ 482:5
[task 2025-04-08T08:44:25.219Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js @ 223:9
[task 2025-04-08T08:44:25.244Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1170:26
[task 2025-04-08T08:44:25.245Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Serializing variables for frame: chrome://mochikit/content/browser-test.js @ 1242:18
[task 2025-04-08T08:44:25.253Z] 08:44:25     INFO - GECKO(1434) | [dump-scope] Saving scope variables as a JSON file: /opt/worker/tasks/task_174410042688531/build/blobber_upload_dir/scope-variables-1744101865252-browser_dbg-event-breakpoints.js_223_9.json
[task 2025-04-08T08:44:25.254Z] 08:44:25     INFO - Not taking screenshot here: see the one that was previously logged
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - TEST-UNEXPECTED-FAIL | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | gutter is visible - 
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - Stack trace:
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:test_ok:1626
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/shared-head.js:assertPausedAtSourceAndLine:482
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - chrome://mochitests/content/browser/devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js:null:223
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:handleTask:1170
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:_runTaskBasedTest:1242
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:Tester_execTest:1383
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - chrome://mochikit/content/browser-test.js:nextTest/<:1159
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - chrome://mochikit/content/tests/SimpleTest/SimpleTest.js:SimpleTest.waitForFocus/<:1058
[task 2025-04-08T08:44:25.256Z] 08:44:25     INFO - TEST-PASS | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | Got at least one frame - 
[task 2025-04-08T08:44:25.257Z] 08:44:25     INFO - TEST-PASS | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | Frame has correct source - 
[task 2025-04-08T08:44:25.258Z] 08:44:25     INFO - TEST-PASS | devtools/client/debugger/test/mochitest/browser_dbg-event-breakpoints.js | Frame paused at line 78, but expected line 78 - 

Comment 1

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 14
• mozilla-central: 2
• try: 4

Table

	no_variant
macosx1470-64--/debug	15
macosx1470-64--/opt	4
macosx1470-64-devedition--/opt	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1959062&startday=2025-04-07&endday=2025-04-13&tree=all

Comment 2

[Julian Descottes [:jdescottes]]

I missed this one, but it's also from the mass reenabling in bug 1957258

Comment 3

[Julian Descottes [:jdescottes]]

Attachment: Bug 1959062 - [devtools] Restore skip if for browser_dbg-event-breakpoints.js on macos

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/4e8fb870bc5b
[devtools] Restore skip if for browser_dbg-event-breakpoints.js on macos r=devtools-reviewers,nchevobbe

Comment 5

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/4e8fb870bc5b

Comment 6

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 2
• try: 2

Table

	http3	no_variant
linux1804-64-qr--/debug	1
macosx1470-64--/debug		2
macosx1470-64--/opt		1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1959062&startday=2025-04-14&endday=2025-04-20&tree=all

Comment 7

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 1

Table

	a11y_checks	http3	no_variant
linux2404-x86_64/debug		1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1959062&startday=2026-02-09&endday=2026-02-15&tree=all

Comment 8

[Intermittent Failures Robot]

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

Repository breakdown:

• autoland: 1

Table

	a11y_checks	http3	no_variant
linux2404-x86_64/debug		1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1959062&startday=2026-03-23&endday=2026-03-29&tree=all