REGRESSION (r254964-r254970?): Catalina Debug JSC bot timing out while running tests

[Ryan Haddad]

The Catalina Debug JSC bot is going 20 minutes without output after running tests for over 3 hours, which causes the test run to get killed:

...
...
Running mozilla-tests.yaml/js1_6/String/regress-306591.js.mozilla-dfg-eager-no-cjit-validate-phases
Running mozilla-tests.yaml/js1_6/String/regress-306591.js.mozilla
Running mozilla-tests.yaml/js1_6/String/regress-306591.js.mozilla-ftl-eager-no-cjit-validate-phases

command timed out: 1200 seconds without output running ['perl', './Tools/Scripts/run-javascriptcore-tests', '--no-build', '--no-fail-fast', '--json-output=jsc_results.json', '--debug', '--builder-name', 'Apple-Catalina-Debug-JSC-Tests', '--build-number', '184', '--buildbot-worker', 'bot638', '--buildbot-master', 'build.webkit.org', '--report', 'https://results.webkit.org'], attempting to kill


https://build.webkit.org/builders/Apple-Catalina-Debug-JSC-Tests/builds/191

[Ryan Haddad]

The last successful run was with r254964. The first failing run was with r254970.

[Ryan Haddad]

Here are the two JSC related changes in this range:

[JSC] Bits from Operand should fit in bits reserved in AbstractHeap's Payload
​https://bugs.webkit.org/show_bug.cgi?id=206619
https://trac.webkit.org/changeset/254968/webkit

It should be possible to build JavaScriptCore with LLVM Source-based Code Coverage, run the tests and see the coverage data
​https://bugs.webkit.org/show_bug.cgi?id=206389

[Yusuke Suzuki]

Committed r255110: <https://trac.webkit.org/changeset/255110>

[Radar WebKit Bug Importer]

<rdar://problem/58887459>