Bug 206229

Summary: REGRESSION: (r254491) [ Mac Debug ] ASSERTION FAILED: heap.mutatorState() != MutatorState::Running
Product: WebKit Reporter: Truitt Savell <tsavell>
Component: JavaScriptCoreAssignee: Nobody <webkit-unassigned>
Status: RESOLVED FIXED    
Severity: Normal CC: keith_miller, webkit-bot-watchers-bugzilla, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   

Description Truitt Savell 2020-01-14 07:25:26 PST 
23 tests are crashing on Mac Debug after the changes in https://trac.webkit.org/changeset/254491/webkit
It looks like the new Assert is causing this.

Example crash log:
stderr:
ASSERTION FAILED: heap.mutatorState() != MutatorState::Running
./runtime/VM.cpp(1069) : void JSC::VM::scanSideState(JSC::ConservativeRoots &) const
1   0x7524c3c39 WTFCrash
2   0x752c0461b WTFCrashWithInfo(int, char const*, char const*, int)


Results: 
https://build.webkit.org/results/Apple-Catalina-Debug-WK2-Tests/r254491%20(1674)/results.html

build:
https://build.webkit.org/builders/Apple-Catalina-Debug-WK2-Tests/builds/1674
Comment 1 Radar WebKit Bug Importer 2020-01-14 07:25:40 PST 
<rdar://problem/58567209>
Comment 2 Keith Miller 2020-01-14 17:48:20 PST 
Fixed in r254549: <https://trac.webkit.org/changeset/254549>