47808 2010-10-18 03:32:33 -0700 chrome.dll!WebCore::RangeBoundaryPoint::toPosition ReadAV@NULL (cf0d0f28bc56f2591cc74f71b46036ea) 2010-12-01 11:51:09 -0800 1 1 1 Unclassified WebKit HTML Editing 528+ (Nightly build) All All RESOLVED FIXED HasReduction P1 Major --- 1 skylined rniwa adele darin enrica eric jparent ojan rniwa tony oldest_to_newest 295422 0 skylined 2010-10-18 03:32:33 -0700 Repro: <html><head><script> function go() { document.execCommand("selectall"); document.designMode="on"; document.execCommand("InsertLineBreak"); document.execCommand("insertimage"); document.execCommand("InsertOrderedList"); document.execCommand("inserthtml", false, "z"); document.execCommand("InsertHorizontalRule"); document.execCommand("selectall"); document.execCommand("createlink", false, "z"); document.execCommand("insertunorderedlist"); } </script></head><body onload="go();"></body></html> stack: chrome.dll!WebCore::RangeBoundaryPoint::toPosition chrome.dll!WebCore::InsertListCommand::doApply chrome.dll!WebCore::EditCommand::apply chrome.dll!WebCore::applyCommand chrome.dll!WebCore::executeInsertUnorderedList chrome.dll!WebCore::Editor::Command::execute chrome.dll!WebCore::Document::execCommand chrome.dll!WebCore::DocumentInternal::execCommandCallback ... 315480 1 75242 rniwa 2010-11-30 18:56:26 -0800 Created attachment 75242 fixes the crash 315711 2 75242 tony 2010-12-01 10:04:13 -0800 Comment on attachment 75242 fixes the crash View in context: https://bugs.webkit.org/attachment.cgi?id=75242&action=review > WebCore/editing/InsertListCommand.cpp:163 > + if (!lastSelectionRange) > + return; Do you think it is likely for this to regress again? This check doesn't seem to buy us much. > LayoutTests/editing/execCommand/switch-multiple-list-items-crash.html:1 > +<html><head><script> Nit: Can you add some text to this test (i.e., shouldn't crash and should print PASS)? 315735 3 rniwa 2010-12-01 10:44:56 -0800 http://crbug.com/59557 http://crbug.com/64692 This is a blocker for Chromium milestone 9. 315745 4 75242 rniwa 2010-12-01 11:00:57 -0800 Comment on attachment 75242 fixes the crash View in context: https://bugs.webkit.org/attachment.cgi?id=75242&action=review >> WebCore/editing/InsertListCommand.cpp:163 >> + return; > > Do you think it is likely for this to regress again? This check doesn't seem to buy us much. I'm sure there are other bugs in moveParagraph (which uses DeleteSelectionCommand, ReplaceSelectionCommand, etc...) and moveParagraphWithClones, and exiting early is better than crashing since a user won't lose data. Because the user can observe that not all paragraphs are listified or unlistified, they should be able to report bugs if this assertion hits. >> LayoutTests/editing/execCommand/switch-multiple-list-items-crash.html:1 >> +<html><head><script> > > Nit: Can you add some text to this test (i.e., shouldn't crash and should print PASS)? I thought doing so will stop reproducing the crash but it seems like it's not affected. Will add some explanation. 315750 5 tony 2010-12-01 11:05:31 -0800 (In reply to comment #4) > (From update of attachment 75242 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=75242&action=review > > >> WebCore/editing/InsertListCommand.cpp:163 > >> + return; > > > > Do you think it is likely for this to regress again? This check doesn't seem to buy us much. > > I'm sure there are other bugs in moveParagraph (which uses DeleteSelectionCommand, ReplaceSelectionCommand, etc...) and moveParagraphWithClones, and exiting early is better than crashing since a user won't lose data. Because the user can observe that not all paragraphs are listified or unlistified, they should be able to report bugs if this assertion hits. Won't we only get bug reports for debug builds (and if someone decides to file the bug)? In the wild, we only get reports of the app crashes. I'm worried that this is papering over future bugs. 315752 6 enrica 2010-12-01 11:07:21 -0800 The change looks good to me 315754 7 75242 darin 2010-12-01 11:09:14 -0800 Comment on attachment 75242 fixes the crash View in context: https://bugs.webkit.org/attachment.cgi?id=75242&action=review >>>> WebCore/editing/InsertListCommand.cpp:163 >>>> + return; >>> >>> Do you think it is likely for this to regress again? This check doesn't seem to buy us much. >> >> I'm sure there are other bugs in moveParagraph (which uses DeleteSelectionCommand, ReplaceSelectionCommand, etc...) and moveParagraphWithClones, and exiting early is better than crashing since a user won't lose data. Because the user can observe that not all paragraphs are listified or unlistified, they should be able to report bugs if this assertion hits. > > Won't we only get bug reports for debug builds (and if someone decides to file the bug)? In the wild, we only get reports of the app crashes. I'm worried that this is papering over future bugs. I think that “papering over” is OK in this case. 315755 8 rniwa 2010-12-01 11:10:53 -0800 (In reply to comment #5) > Won't we only get bug reports for debug builds (and if someone decides to file the bug)? In the wild, we only get reports of the app crashes. I'm worried that this is papering over future bugs. Sure but I don't want to make debugging easier at the cost of user experience. We also have similar sanity checks & early exits in ApplyBlockElementCommand::formatSelection, which is used by FormatBlockCommand and IndentOutdentCommand. 315757 9 rniwa 2010-12-01 11:11:36 -0800 Thanks for the review, Darin & Tony. I'll add the comment Tony mentioned and land. 315782 10 rniwa 2010-12-01 11:51:09 -0800 Committed r73052: <http://trac.webkit.org/changeset/73052> 75242 2010-11-30 18:56:26 -0800 2010-12-01 11:09:14 -0800 fixes the crash bug-47808-20101130185625.patch text/plain 6988 rniwa SW5kZXg6IFdlYkNvcmUvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFdlYkNvcmUvQ2hhbmdlTG9n CShyZXZpc2lvbiA3Mjk5OSkKKysrIFdlYkNvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBA IC0xLDMgKzEsMjMgQEAKKzIwMTAtMTEtMzAgIFJ5b3N1a2UgTml3YSAgPHJuaXdhQHdlYmtpdC5v cmc+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgVGhl IGNyYXNoIHdhcyBjYXVzZWQgYnkgbW92ZVBhcmFncmFwaFdpdGhDbG9uZXMnIG5vdCBjb3B5aW5n IHRoZSBlbnRpcmUgcGFyYWdyYXBoCisgICAgICAgIHdoZW4gY2FsbGVkIGJ5IGRvQXBwbHlGb3JT aW5nbGVQYXJhZ3JhcGgsIHdoaWNoIHdhcyBpbmR1Y2VkIGJ5IGEgYnVnIGluCisgICAgICAgIGNs b25lUGFyYWdyYXBoVW5kZXJOZXdFbGVtZW50IHdoaWNoIGVuZGVkIHRoZSBjbG9uaW5nIHByb2Nl 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