23635 2009-01-29 21:18:59 -0800 Successively reloading Slashdot causes an assertion failure 2011-09-08 18:00:44 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED INVALID InRadar P1 Normal --- 1 zwarich zwarich barraclough ggaren oliver oldest_to_newest 107639 0 zwarich 2009-01-29 21:18:59 -0800 Consecutively reloading Slashdot causes an assertion failure of the following form: Program received signal EXC_BAD_ACCESS, Could not access memory. Reason: KERN_INVALID_ADDRESS at address: 0xbbadbeef 0x0058e414 in JSC::asObject (value={m_ptr = 0x20896a80}) at JSObject.h:215 215 ASSERT(asCell(value)->isObject()); (gdb) bt #0 0x0058e414 in JSC::asObject (value={m_ptr = 0x20896a80}) at JSObject.h:215 #1 0x0061a3b3 in JSC::JIT::privateCompileGetByIdChainList (this=0xbfffd69c, stubInfo=0x1c2401c0, prototypeStructures=0x1c4eb7f0, currentIndex=1, structure=0x1e6e9ad0, chain=0x1f60ee20, count=2, cachedOffset=4, callFrame=0x208ed178) at /Users/Cameron/WebKit/JavaScriptCore/jit/JITPropertyAccess.cpp:540 #2 0x00602657 in JSC::JIT::compileGetByIdChainList (globalData=0x1fd1a400, callFrame=0x208ed178, codeBlock=0x1f680810, stubInfo=0x1c2401c0, prototypeStructureList=0x1c4eb7f0, currentIndex=1, structure=0x1e6e9ad0, chain=0x1f60ee20, count=2, cachedOffset=4) at JIT.h:313 #3 0x005ee107 in JSC::Interpreter::cti_op_get_by_id_proto_list (args=0x0) at /Users/Cameron/WebKit/JavaScriptCore/interpreter/Interpreter.cpp:4621 107640 1 27172 zwarich 2009-01-29 21:20:45 -0800 Created attachment 27172 First steps at a reduction Here's a pretty good reduction from the original page. I will try to reduce it further. 107649 2 27174 zwarich 2009-01-29 23:52:17 -0800 Created attachment 27174 Further reduction This is as good as I can make a reduction. In order for it to work, it needs to be the first thing I load with a local debug build of WebKit. 107715 3 27185 zwarich 2009-01-30 09:40:10 -0800 Created attachment 27185 Even further reduction Here's a way simpler reduction: function f(o, propertyName) { return o.propertyIsEnumerable(propertyName); } f("Slash", "split"); f("Slash", "length"); I can't reproduce it with jsc, and the same conditions apply as the previous reduction. 107779 4 zwarich 2009-01-30 14:44:12 -0800 This program demonstrates the problem as well, although it doesn't crash for me: function f(o) { return o.propertyIsEnumerable; } f(""); f(""); The problem is that a cached prototype chain is created for the JSString Structure, which is stored in JSGlobalData. Since the cached prototype chain is not marked (presumedly because it doesn't have to be marked), the object it is pointing to disappears and is replaced by another object. I think the bug is that it is caching this prototype chain in the first place, since this Structure lives on JSGlobalData and persists across pages, but I am not sure about the best way to fix it. A similar bug should occur with the number prototype. 110148 5 zwarich 2009-02-18 17:57:02 -0800 It appears that this only happens in the string case, not the number case. I am not sure why the number case doesn't get cached. 110149 6 zwarich 2009-02-18 18:00:03 -0800 Ah, the problem only occurs for non-immediate numbers, because immediates are automatically excluded from caching. 110154 7 zwarich 2009-02-18 18:12:53 -0800 Gavin, I was pondering adding a bit to Structure that says whether a Structure has been globally allocated to deal with this in the meantime. The fix would be to disable caching for such Structures. Does this sound like an acceptable fix? 120859 8 ap 2009-05-12 08:26:08 -0700 <rdar://problem/6878952> 190860 9 ap 2010-02-16 19:10:46 -0800 I cannot reproduce this with ToT. Can this bug be closed? 190867 10 barraclough 2010-02-16 19:32:02 -0800 Having been through the code, I think this bug still exists (at least in theory), and should be fixed. JSGlobalData contains a set of refpointers to structures, like this: RefPtr<Structure> activationStructure; These Structures contain JSValue m_prototype; Which I think should be marked. One simple fix would be to add: activationStructure->storedPrototype() etc to the markStack every time we start a GC. I'll check with Geoff & see what he thinks of this. cheers, G. 191256 11 ggaren 2010-02-17 15:33:22 -0800 Seems like objects that have per-window prototype chains either need to have per-window structures, or need to not participate in prototype chain caching. 191258 12 ggaren 2010-02-17 15:36:14 -0800 There's no need to mark a structure's prototype if it's null. All of the structures in that list have null prototypes. However, they might have non-null prototype chains. Prototype chains are the new thing here. 464542 13 barraclough 2011-09-08 18:00:44 -0700 These do now get marked (Structure is a GC type now, so the RefPtr<Structure>s are all Strong<Structure>s, these are GC roots), so this bug no longer exists. 27172 2009-01-29 21:20:45 -0800 2009-01-29 23:52:17 -0800 First steps at a reduction test.html text/html 101151 zwarich PGh0bWw+CjxoZWFkPgo8c2NyaXB0IHR5cGU9InRleHQvamF2YXNjcmlwdCI+CihmdW5jdGlvbigp ewovKgogKiBqUXVlcnkgMS4yLjYgLSBOZXcgV2F2ZSBKYXZhc2NyaXB0CiAqCiAqIENvcHlyaWdo dCAoYykgMjAwOCBKb2huIFJlc2lnIChqcXVlcnkuY29tKQogKiBEdWFsIGxpY2Vuc2VkIHVuZGVy IHRoZSBNSVQgKE1JVC1MSUNFTlNFLnR4dCkKICogYW5kIEdQTCAoR1BMLUxJQ0VOU0UudHh0KSBs aWNlbnNlcy4KICoKICogJERhdGU6IDIwMDgtMDUtMjQgMTQ6MjI6MTcgLTA0MDAgKFNhdCwgMjQg TWF5IDIwMDgpICQKICogJFJldjogNTY4NSAkCiAqLwoKLy8gTWFwIG92ZXIgalF1ZXJ5IGluIGNh c2Ugb2Ygb3ZlcndyaXRlCnZhciBfalF1ZXJ5ID0gd2luZG93LmpRdWVyeSwKLy8gTWFwIG92ZXIg dGhlICQgaW4gY2FzZSBvZiBvdmVyd3JpdGUKCV8kID0gd2luZG93LiQ7Cgp2YXIgalF1ZXJ5ID0g 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