128745 2014-02-13 09:16:37 -0800 REGRESSION: fast/workers/use-machine-stack.html hits Heap::isMarked(cell) assertion 2014-02-19 11:58:59 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED DUPLICATE 128537 InRadar, Regression P1 Normal --- 1 ap mhahnenberg fpizlo ggaren mhahnenberg webkit-bug-importer oldest_to_newest 980314 0 ap 2014-02-13 09:16:37 -0800 fast/workers/use-machine-stack.html has started to fail (not very frequently) on February 8th, hitting this assertion: ASSERTION FAILED: Heap::isMarked(cell) /Volumes/Data/slave/mountainlion-debug/build/Source/JavaScriptCore/heap/SlotVisitorInlines.h(123) : void JSC::SlotVisitor::unconditionallyAppend(JSC::JSCell *) 1 0x10c6a8a90 WTFCrash 2 0x10bfa678d JSC::SlotVisitor::unconditionallyAppend(JSC::JSCell*) 3 0x10c3064dd JSC::Heap::addToRememberedSet(JSC::JSCell const*) 4 0x10c0623d8 JSC::CodeBlockSet::rememberCurrentlyExecutingCodeBlocks(JSC::Heap*) 5 0x10c306b3e JSC::Heap::collect() 6 0x10c2f64c4 JSC::DefaultGCActivityCallback::doWork() 7 0x10c317222 JSC::HeapTimer::timerDidFire(__CFRunLoopTimer*, void*) 8 0x7fff90360804 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ 980315 1 webkit-bug-importer 2014-02-13 09:17:14 -0800 <rdar://problem/16059648> 980319 2 ap 2014-02-13 09:20:05 -0800 Marked as flakily asserting in <http://trac.webkit.org/r164030>. Looks like all worker tests have regressed last week :-( 982448 3 mhahnenberg 2014-02-19 11:09:53 -0800 I think this is a dup of bug 128537. What is happening is that CodeBlocks from the Worker virtual machine are being marked as part of the main thread's garbage collection, which confuses our ASSERT later on. *** This bug has been marked as a duplicate of bug 128537 *** 982452 4 mhahnenberg 2014-02-19 11:12:22 -0800 *** Bug 128656 has been marked as a duplicate of this bug. *** 982485 5 ap 2014-02-19 11:58:59 -0800 Nice! Could you please remove it from TestExpectations?