103076 2012-11-22 08:59:21 -0800 Web Inspector: Heap snapshot crashes on any page in MacOS Canary 2012-12-12 01:23:33 -0800 1 1 1 Unclassified WebKit Web Inspector (Deprecated) 528+ (Nightly build) All All RESOLVED FIXED P2 Normal --- 1 alph yurys abarth apavlov dglazkov gyuyoung.kim haraken japhet keishi loislo peter+ews pfeldman pmuellr rakuco vsevik web-inspector-bugs webkit.review.bot yurys oldest_to_newest 773988 0 alph 2012-11-22 08:59:21 -0800 Open any page (cnn.com) in Chrome Canary (tried on 25.0.1332.0) on MacOS and take a heap snapshot. The page crashes (crash id be1ab3fe31429c73). Call stack: 0x020d33a1 [Google Chrome Framework] - ../../../../../v8/include/v8.h:4234] WebCore::DOMDataStore::current 0x0263c9a9 [Google Chrome Framework] - ../bindings/v8/DOMDataStore.h:68] WebCore::DOMDataStore::getNode 0x026a3212 [Google Chrome Framework] - V8Document.h:76] WebCore::DOMWindowV8Internal::documentAttrGetter 0x01c49114 [Google Chrome Framework] - objects.cc:207] v8::internal::JSObject::GetPropertyWithCallback 0x01c48ef5 [Google Chrome Framework] - objects.cc:652] v8::internal::Object::GetProperty 0x01c48bd7 [Google Chrome Framework] - objects.cc:159] v8::internal::Object::GetPropertyWithReceiver 0x01ca7c26 [Google Chrome Framework] - ../../src/objects-inl.h:873] v8::internal::V8HeapExplorer::TagGlobalObjects 0x01ca8c1c [Google Chrome Framework] - profile-generator.cc:3094] v8::internal::HeapSnapshotGenerator::GenerateSnapshot 0x01b9630d [Google Chrome Framework] - heap-profiler.cc:135] v8::internal::HeapProfiler::TakeSnapshotImpl 0x01b963f4 [Google Chrome Framework] - heap-profiler.cc:153] v8::internal::HeapProfiler::TakeSnapshot 0x01b2e96c [Google Chrome Framework] - api.cc:6413] v8::HeapProfiler::TakeSnapshot 0x020e6276 [Google Chrome Framework] - ScriptProfiler.cpp:155] WebCore::ScriptProfiler::takeHeapSnapshot 0x0232cdea [Google Chrome Framework] - InspectorProfilerAgent.cpp:434] WebCore::InspectorProfilerAgent::takeHeapSnapshot 775262 1 yurys 2012-11-26 01:55:37 -0800 Downstream bug: https://code.google.com/p/chromium/issues/detail?id=162121 775269 2 yurys 2012-11-26 02:04:46 -0800 This was likely broken in http://trac.webkit.org/changeset/135230 775637 3 abarth 2012-11-26 10:40:25 -0800 It's probably not that exact patch since that one just moves code around, but it looks like the heap snapshot is breaking the assumption that we never grab the wrapper for a node unless we're inside a V8 context. The correct fix is to do this work inside a V8 context. It's not sensible to call functions like DOMWindowV8Internal::documentAttrGetter outside a V8 context. 775746 4 abarth 2012-11-26 11:58:52 -0800 Actually, you're right. That was the step that removed the inContext check. 775749 5 abarth 2012-11-26 11:59:38 -0800 We can add the inContext check back, but it will slow down every DOM operation. 776426 6 yurys 2012-11-27 00:11:32 -0800 We need to fix this in v8 profile generator and it's going to be a two-sided change so it may make sense to return the check until we have a proper fix. 776839 7 176283 abarth 2012-11-27 09:16:13 -0800 Created attachment 176283 Likely fix but no test 776841 8 abarth 2012-11-27 09:17:06 -0800 I've attached a patch that should fix the problem. Would you be willing to write a test that shows the issue? I'm not familiar with how to write tests of the web inspector's heap snapshot feature. 778528 9 yurys 2012-11-28 17:25:31 -0800 Hm, the issue is 100% repeatable on the canary build Google Chrome 25.0.1337.1 (Official Build 169970) canary OS Mac OS X WebKit 537.20 (@135920) but I cannot reproduce it neither on tip-of-tree build nor on http://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?path=Mac/169960/ http://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?path=Mac/169996/ continuos builds. I'm attaching the page where the bug is reproducible. 778530 10 176609 yurys 2012-11-28 17:27:05 -0800 Created attachment 176609 Sample page (doc.html) 779120 11 176751 yurys 2012-11-29 09:58:33 -0800 Created attachment 176751 Patch 779122 12 yurys 2012-11-29 09:59:46 -0800 (In reply to comment #11) > Created an attachment (id=176751) [details] > Patch This patch depends on V8 change https://codereview.chromium.org/11415203/ and won't compile on the current Chromium source base. 779126 13 abarth 2012-11-29 10:09:52 -0800 Thanks. This looks like a good approach. 779160 14 176751 peter+ews 2012-11-29 10:25:46 -0800 Comment on attachment 176751 Patch Attachment 176751 did not pass cr-android-ews (chromium-android): Output: http://queues.webkit.org/results/15027904 779363 15 176751 webkit.review.bot 2012-11-29 13:01:22 -0800 Comment on attachment 176751 Patch Attachment 176751 did not pass chromium-ews (chromium-xvfb): Output: http://queues.webkit.org/results/15029919 789321 16 yurys 2012-12-12 01:23:33 -0800 Committed r137433: <http://trac.webkit.org/changeset/137433> 176283 2012-11-27 09:16:13 -0800 2012-11-29 09:58:27 -0800 Likely fix but no test bug-103076-20121127091350.patch text/plain 903 abarth U3VidmVyc2lvbiBSZXZpc2lvbjogMTM1ODY0CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9i aW5kaW5ncy92OC9ET01EYXRhU3RvcmUuY3BwIGIvU291cmNlL1dlYkNvcmUvYmluZGluZ3Mvdjgv RE9NRGF0YVN0b3JlLmNwcAppbmRleCA5MWZiOWRjZTYxNTZkM2ZiYzQyMmU1NTJhOTA3ZDk1MTNj ZTJiZWZkLi4zNWQ0NzM5NjEzNjRhZGU0MGY3NjIyNDVjN2Q4NjY5MjNmZGI4ZWNjIDEwMDY0NAot 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