129758 2014-03-05 14:44:38 -0800 REGRESSION: js/dom/create-lots-of-workers.html frequently crashes (sometimes in js/dom/cross-frame-bad-time.html) 2026-03-15 14:17:49 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified NEW InRadar, Regression P2 Normal --- 1 ap webkit-unassigned ddkilzer dpino fpizlo ggaren mhahnenberg mmaxfield webkit-bug-importer oldest_to_newest 987398 0 ap 2014-03-05 14:44:38 -0800 js/dom/create-lots-of-workers.html frequently crashes, spawning an extreme number of threads. This is sometimes reported for this tests, and sometimes for the next one, js/dom/cross-frame-bad-time.html. There are only 100 workers, but >2000 threads: <http://build.webkit.org/results/Apple%20MountainLion%20Debug%20WK1%20(Tests)/r165119%20(13072)/js/dom/cross-frame-bad-time-crash-log.txt>. 987417 1 mhahnenberg 2014-03-05 15:30:39 -0800 (In reply to comment #0) > js/dom/create-lots-of-workers.html frequently crashes, spawning an extreme number of threads. This is sometimes reported for this tests, and sometimes for the next one, js/dom/cross-frame-bad-time.html. > > There are only 100 workers, but >2000 threads: <http://build.webkit.org/results/Apple%20MountainLion%20Debug%20WK1%20(Tests)/r165119%20(13072)/js/dom/cross-frame-bad-time-crash-log.txt>. I count at least 261 workers in the crash log, but you're right, this is a little crazy. We spawn ~6 GC threads and 1 block freeing thread per VM (along with the main worker thread). 988800 2 ap 2014-03-09 22:12:42 -0700 Skipped the test in <http://trac.webkit.org/r165360>, as it was making bots very red. A fix would be appreciated, we don't have a lot of workers tests to skip. 988960 3 ap 2014-03-10 11:11:05 -0700 *** Bug 129962 has been marked as a duplicate of this bug. *** 1067739 4 ddkilzer 2015-02-08 18:31:45 -0800 <rdar://problem/19760988> 1067753 5 ddkilzer 2015-02-08 19:39:08 -0800 Skipped on ios-simulator: <http://trac.webkit.org/changeset/179818> 2190432 6 dpino 2026-03-15 14:17:49 -0700 In WebKitGTK, this test is marked as flaky "Crash Pass" but according to results.webkit.org the test has been constantly passing (at least in the last 4000 revisions): https://results.webkit.org/?platform=GTK&platform=WPE&&suite=layout-tests&test=js/dom/create-lots-of-workers.html&limit=4000 I also run this test several times on Mac, and it didn't return an error: ``` $ ./Tools/Scripts/run-webkit-tests --force --repeat 100 js/dom/create-lots-of-workers.html Using port 'mac-sequoia-wk2' Test configuration: <sequoia, arm64, release> ... All 100 tests ran as expected. Expected to fail, but passed: (1) js/dom/create-lots-of-workers.html ``` In summary, I think there's a high chance this test is passing now. I have at least removed it from WebKitGTK test expectations (https://commits.webkit.org/309291@main).