20633 2008-09-03 13:50:09 -0700 Crash in privateExecute @ cs.byu.edu 2010-07-07 08:27:58 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Mac OS X 10.5 RESOLVED FIXED http://cs.byu.edu/courses/current InRadar, NeedsReduction P1 Normal --- 1 bjhomer zwarich bugs.webkit.org dev+webkit ggaren grantg69 mrowe webkit zwarich oldest_to_newest 90059 0 bjhomer 2008-09-03 13:50:09 -0700 Visiting http://cs.byu.edu/courses/current with the latest nightly build crashes the entire browser. Error log points to a JavaScript error. 90063 1 mrowe 2008-09-03 14:31:37 -0700 Can you please attach a crash log? See <http://webkit.org/quality/crashlogs.html> for details about how to get a crash log. 90064 2 mrowe 2008-09-03 14:31:49 -0700 <rdar://problem/6194259> 90075 3 dev+webkit 2008-09-03 15:00:38 -0700 ASSERTION FAILED: protoObject->get(exec, codeBlock->identifiers[vPC[3].u.operand]) == protoObject->getDirectOffset(offset) (/Users/matt/Code/WebKit/JavaScriptCore/VM/Machine.cpp:2236 KJS::JSValue* KJS::Machine::privateExecute(KJS::Machine::ExecutionFlag, KJS::ExecState*, KJS::RegisterFile*, KJS::Register*, KJS::ScopeChainNode*, KJS::CodeBlock*, KJS::JSValue**)) Thread 0 Crashed: 0 com.apple.JavaScriptCore 0x0050ceea KJS::Machine::privateExecute(KJS::Machine::ExecutionFlag, KJS::ExecState*, KJS::RegisterFile*, KJS::Register*, KJS::ScopeChainNode*, KJS::CodeBlock*, KJS::JSValue**) + 25932 (Machine.cpp:2236) 1 com.apple.JavaScriptCore 0x005118a6 KJS::Machine::execute(KJS::ProgramNode*, KJS::ExecState*, KJS::ScopeChainNode*, KJS::JSObject*, KJS::JSValue**) + 698 (Machine.cpp:795) 2 com.apple.JavaScriptCore 0x004a380f KJS::Interpreter::evaluate(KJS::ExecState*, KJS::ScopeChain&, KJS::UString const&, int, WTF::PassRefPtr<KJS::SourceProvider>, KJS::JSValue*) + 427 (interpreter.cpp:83) 3 com.apple.WebCore 0x038f1766 WebCore::ScriptController::evaluate(WebCore::String const&, int, WebCore::String const&) + 268 (ScriptController.cpp:116) 4 com.apple.WebCore 0x0347cc83 WebCore::FrameLoader::executeScript(WebCore::String const&, int, WebCore::String const&) + 153 (FrameLoader.cpp:790) 5 com.apple.WebCore 0x0350e9a2 WebCore::HTMLTokenizer::scriptExecution(WebCore::String const&, WebCore::HTMLTokenizer::State, WebCore::String const&, int) + 300 (HTMLTokenizer.cpp:559) 6 com.apple.WebCore 0x035100b3 WebCore::HTMLTokenizer::scriptHandler(WebCore::HTMLTokenizer::State) + 1537 (HTMLTokenizer.cpp:498) 7 com.apple.WebCore 0x0351070e WebCore::HTMLTokenizer::parseSpecial(WebCore::SegmentedString&, WebCore::HTMLTokenizer::State) + 996 (HTMLTokenizer.cpp:344) 8 com.apple.WebCore 0x03512798 WebCore::HTMLTokenizer::parseTag(WebCore::SegmentedString&, WebCore::HTMLTokenizer::State) + 6778 (HTMLTokenizer.cpp:1512) 9 com.apple.WebCore 0x03513145 WebCore::HTMLTokenizer::write(WebCore::SegmentedString const&, bool) + 1521 (HTMLTokenizer.cpp:1747) 10 com.apple.WebCore 0x0350eebf WebCore::HTMLTokenizer::notifyFinished(WebCore::CachedResource*) + 807 (HTMLTokenizer.cpp:2027) 90076 4 mrowe 2008-09-03 15:19:35 -0700 The assertion failure looks sorta similar to that on bug 20626. 90097 5 zwarich 2008-09-03 19:25:35 -0700 I'll assign this to myself, since I can't work on bug 20626. 90099 6 23154 zwarich 2008-09-03 19:49:11 -0700 Created attachment 23154 Partial reduction Here is a reduction of the bug. It loads 3 JS libraries and runs one command. Now it's time to pick apart the libraries. 90104 7 dev+webkit 2008-09-03 20:54:30 -0700 *** Bug 20636 has been marked as a duplicate of this bug. *** 90105 8 23156 zwarich 2008-09-03 20:59:24 -0700 Created attachment 23156 Further reduction I can't seem to reduce it much further than this. This bug is very sensitive to the number of properties added to objects, even if they are never actually used. I have been able to replace some useless functions with blank bodies, but removing useless code from the bodies of functions that are actually called can cause the problem to go away. 90106 9 23157 zwarich 2008-09-03 21:19:35 -0700 Created attachment 23157 CodeBlock dump Here is a CodeBlock dump of the crash. The crash occurs at instruction 216, which is the lookup of setArray in the jQuery constructor. The actual property seems to be the right value, but the fast offset lookup returns 0. 90107 10 zwarich 2008-09-03 21:40:11 -0700 This is a strange crash. When the lookup is optimized to become get_by_id_proto, the slot holds the correct value. However, it is zero'd out some time before the lookup is made. I'll try to figure out what is clearing it. There is nothing in the JS code that is supposed to write to it, at least as far as I can tell. 90110 11 dev+webkit 2008-09-03 21:58:17 -0700 *** Bug 20637 has been marked as a duplicate of this bug. *** 90112 12 zwarich 2008-09-03 22:30:12 -0700 The problem occurs in PropertyMap::rehash(). After the only rehash of a PropertyMap table with newTableSize 512, the value with offset 281 is zeroed out. Before the rehash, it is the correct value. 90120 13 ggaren 2008-09-04 00:21:58 -0700 Committed revision 36081. 90128 14 zwarich 2008-09-04 01:31:07 -0700 *** Bug 20640 has been marked as a duplicate of this bug. *** 90163 15 webkit 2008-09-04 08:59:09 -0700 Confirming that errant behavior as exhibited on Sears site is no longer present in current nightly (4 Sep 08). 90226 16 grantg69 2008-09-04 18:45:04 -0700 Fixed, many thanks. 23154 2008-09-03 19:49:11 -0700 2008-09-03 20:59:24 -0700 Partial reduction reduction.html text/html 383 zwarich PGh0bWw+CjxoZWFkPgo8YmFzZSBocmVmPSJodHRwOi8vY3MuYnl1LmVkdS9jb3Vyc2VzL2N1cnJl bnQiIC8+CjxzY3JpcHQgdHlwZT0idGV4dC9qYXZhc2NyaXB0IiBzcmM9Ii9taXNjL2pxdWVyeS5q cyI+PC9zY3JpcHQ+CjxzY3JpcHQgdHlwZT0idGV4dC9qYXZhc2NyaXB0IiBzcmM9Ii9saWIvanMv c2l0ZV9saWIuanMiPjwvc2NyaXB0Pgo8c2NyaXB0IHR5cGU9InRleHQvamF2YXNjcmlwdCIgc3Jj PSIvc2l0ZXMvYWxsL21vZHVsZXMvanF1ZXJ5X3VwZGF0ZS9jb21wYXQtMS4wLmpzIj48L3Njcmlw 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