2070797 - [meta] Fix the flakiness in devtools/client/debugger/test/mochitest

Status: NEW

(DevTools :: Debugger, task)

Description

[Florian Quèze [:florian]]

Tracking bug for the flakiness burndown of devtools/client/debugger/test/mochitest. This bug is the landing target for the annotation removals that have no failures still reproducing on try, and the meta bug tracking the individual fixes.

Over 2026-08-18 - 2026-09-07 the folder's 233 tests produced 249 failures, 291 timeouts, 17 crashes and 41,523 skipped runs, with 60 tests carrying at least one issue.

One finding worth mentioning: a skip-if does not just silence a test failure, it lets it rot: browser_dbg-watchpoints.js needed three separate fixes before it would pass again, sourcemaps/browser_dbg-sourcemapped-stepping.js four, and browser_dbg-reloading.js three; in each case later refactors updated the living siblings in the same file and passed over the disabled test. sourcemaps/browser_dbg-sourcemapped-stepping.js landed already skipped in May 2018 and has never once run in mozilla-central.

Comment 1

[Florian Quèze [:florian]]

Attachment: Bug 2070797 - Stop skipping debugger tests on tsan, asan and mac, r=#devtools-reviewers.

No failure on try. Bug 1607636, cited by one of them, is a general intermittent
rather than a tsan defect; Bug 1591064 is a task about enabling ToolboxTask
tests on asan.

Bug 1959062's mac skip can never apply on macosx1470-64, whose test set is
cppunittest only, and Bug 2028047 mirrored it onto macOS 15 across every test
carrying it, without evidence for this file.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/0e7fcd812fdd
https://hg.mozilla.org/integration/autoland/rev/6cb4fd2f9b69
Stop skipping debugger tests on tsan, asan and mac, r=devtools-reviewers,ochameau.

Comment 3

[Silaghi Andreea]

https://hg.mozilla.org/mozilla-central/rev/6cb4fd2f9b69