The following Java stress test is a flaky failure on High Sierra Release stress/ftl-put-by-id-setter-exception.js.dfg-eager-no-cjit-validate It's a flaky failure in the last 200 runs, fails about every 15 runs. Build Log on the oldest run I can find : https://build.webkit.org/builders/Apple%20High%20Sierra%20Release%20JSC%20%28Tests%29/builds/8564 Error: stress/ftl-put-by-id-setter-exception.js.dfg-eager-no-cjit-validate: Exception: Error42 stress/ftl-put-by-id-setter-exception.js.dfg-eager-no-cjit-validate: ERROR: Unexpected exit code: 3 FAIL: stress/ftl-put-by-id-setter-exception.js.dfg-eager-no-cjit-validate stdio: https://build.webkit.org/builders/Apple%20High%20Sierra%20Release%20JSC%20%28Tests%29/builds/8564/steps/jscore-test/logs/stdio
I don't see crash logs with corresponding timestamps, so probably not a crash.
<rdar://problem/49571616>