2090288 - Intermittent [tier 2] Firefox Nightly.app/Contents/MacOS/XUL differs. See the diff.html or diff.txt artifact

Status: RESOLVED FIXED

(Firefox Build System :: Toolchains, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: agoloman [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=605437622&repo=mozilla-central&task=bsVWZhsfQxi8uggu5OfwCg.0
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/bsVWZhsfQxi8uggu5OfwCg/runs/0/artifacts/public/logs/live_backing.log

---

[task 2026-11-06T19:04:57.137+00:00] ++ dirname /builds/worker/bin/get_and_diffoscope
[task 2026-11-06T19:04:57.138+00:00] + /builds/worker/bin/report_error diff
[task 2026-11-06T19:04:57.149+00:00] TEST-UNEXPECTED-FAIL | Firefox Nightly.app/Contents/MacOS/XUL differs. See the diff.html or diff.txt artifact
[task 2026-11-06T19:04:57.151+00:00] + fail
[task 2026-11-06T19:04:57.151+00:00] + exit 1
[taskcluster 2026-11-06T19:04:57.373Z]                        Exit Code: 1
[taskcluster 2026-11-06T19:04:57.373Z]                        User Time: 12.613ms
[taskcluster 2026-11-06T19:04:57.373Z]                      Kernel Time: 19.97ms
[taskcluster 2026-11-06T19:04:57.373Z]                        Wall Time: 1m47.288806338s
[taskcluster 2026-11-06T19:04:57.373Z]  Average Available System Memory: 57.30 GiB
[taskcluster 2026-11-06T19:04:57.373Z]       Average System Memory Used: 5.49 GiB
[taskcluster 2026-11-06T19:04:57.373Z]          Peak System Memory Used: 8.25 GiB
[taskcluster 2026-11-06T19:04:57.373Z]              Total System Memory: 62.79 GiB
[taskcluster 2026-11-06T19:04:57.373Z]                           Result: FAILED
[taskcluster 2026-11-06T19:04:57.373Z] === Task Finished ===
[taskcluster 2026-11-06T19:04:57.373Z] Task Duration: 1m47.288960763s
[taskcluster:error] exit status 1

Comment 1

[Goloman Adrian[:agoloman]]

Julien could you please take a look?
Diff.html
Diff.txt

Comment 2

[Mike Hommey [:glandium]]

Likely a regression from bug 2039813.

Comment 3

[Mike Hommey [:glandium]]

(In reply to Mike Hommey [:glandium] from comment #2)

Likely a regression from bug 2039813.

Surprisingly not? https://treeherder.mozilla.org/jobs?repo=autoland&selectedTaskRun=JZ_fh6QUQ8aXJShGRWODQg.0&revision=ccda191f91b8fec879e774d5ec23d8509b1c1f18&searchStr=diff

Comment 4

[Mike Hommey [:glandium]]

It's actually intermittent (but permanent on reruns because the diff jobs are just comparing things that have already been produced and that a rerun doesn't rebuild). It's also an old bug in ld64, but happens rarely, and wasn't detectable until bug 2087367.

Comment 5

[Mike Hommey [:glandium]]

Attachment: Bug 2090288 - Fix out-of-bound read in ld64 that leads to non-determinism.

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/b42441b06bc2
https://hg.mozilla.org/integration/autoland/rev/03e72d184a09
Fix out-of-bound read in ld64 that leads to non-determinism. r=firefox-build-system-reviewers,sylvestre

Comment 7

[Iulian Moraru]

https://hg.mozilla.org/mozilla-central/rev/03e72d184a09

Comment 8

[Intermittent Failures Robot]

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

Repository breakdown:

• mozilla-central: 2

Table

	no_variant
macosx64-aarch64/unknown build	2

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=2090288&startday=2026-11-02&endday=2026-11-08&tree=all