126979 2014-01-14 05:19:34 -0800 [GTK] Web process sometimes crashes when printing in synchronous mode 2014-01-15 09:33:35 -0800 1 1 1 Unclassified WebKit WebKit2 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED Gtk P2 Normal --- 126977 1 cgarcia webkit-unassigned andersca bunhere cdumez commit-queue gustavo gyuyoung.kim ltilve rakuco oldest_to_newest 967770 0 cgarcia 2014-01-14 05:19:34 -0800 The problem is that it's still possible to receive and process the EndPrinting message while the print operation is ongoing. For rendering print pages we are using a nested main loop and idle sources with a higher priority than the idle source used by the I/O thread, so that EndPrinting is never processed until the printing has actually finished. The problem is that sometimes the EndPrinting message is received before starting to render the pages, while we are still enumerating the printers to find the required one. When running in sync mode gtk_enumerate_printers() also uses a nested main loop, so that while waiting for the printer backends to reply, the EndPrinting message can be attended by the run loop, deleting the print context and the print operation. When gtk_enumerate_printers() finishes, the print operation has already been deleted unexpectedly. 968251 1 221254 cgarcia 2014-01-15 02:53:16 -0800 Created attachment 221254 Patch 968269 2 221254 gustavo 2014-01-15 04:26:25 -0800 Comment on attachment 221254 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=221254&action=review LGTM, only a few questions to ensure I understood the life-cycle of the printer list correctly. > Source/WebKit2/ChangeLog:12 > + UI process like EndPrinting. When the EndPriting message is Readability would be improved by using longer lines and/or splitting in paragraphs, I think. > Source/WebKit2/WebProcess/WebCoreSupport/WebChromeClient.cpp:610 > + RefPtr<PrinterListGtk> printerList = PrinterListGtk::shared(); Do I understand correctly that the printer list is kept alive by this reference, but is destroyed afterwards? I was a bit concerned when I saw PrinterListGtk::s_sharedPrinterList, since that could mean the printer list would only be obtained once, but I think I understand the idea now. > Source/WebKit2/WebProcess/WebPage/gtk/PrinterListGtk.h:53 > + Vector<GRefPtr<GtkPrinter>, 4> m_printerList; Any particular reason for using 4 here? 968282 3 cgarcia 2014-01-15 04:56:31 -0800 (In reply to comment #2) > (From update of attachment 221254 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=221254&action=review > > LGTM, only a few questions to ensure I understood the life-cycle of the printer list correctly. Thanks! > > Source/WebKit2/ChangeLog:12 > > + UI process like EndPrinting. When the EndPriting message is > > Readability would be improved by using longer lines and/or splitting in paragraphs, I think. my emacs. . . > > Source/WebKit2/WebProcess/WebCoreSupport/WebChromeClient.cpp:610 > > + RefPtr<PrinterListGtk> printerList = PrinterListGtk::shared(); > > Do I understand correctly that the printer list is kept alive by this reference, but is destroyed afterwards? I was a bit concerned when I saw PrinterListGtk::s_sharedPrinterList, since that could mean the printer list would only be obtained once, but I think I understand the idea now. Yes, it's tricky. The thing is that for sync printing, we need to make sure that the PrinterList object has already been created, for async printing the PrinterList object is created in WebPrintOperationGtk::startPrint(). The shared method returns a RefPtr, but when created the reference is adopted. So what happens is the following: Sync printing: WebChromeClient::print() -> creates the PrinterList WebPrintOperationGtk::startPrint() -> gets a ref of the existing PrinterList WebPrintOperationGtk::startPrint() -> releases its ref WebChromeClient::print() -> PrinterList is destroyed Async printing: WebPrintOperationGtk::startPrint() -> creates the PrinterList WebPrintOperationGtk::startPrint() -> PrinterList is destroyed > > Source/WebKit2/WebProcess/WebPage/gtk/PrinterListGtk.h:53 > > + Vector<GRefPtr<GtkPrinter>, 4> m_printerList; > > Any particular reason for using 4 here? Nope, I assumed there are usually less than 4 printers (print to file, real printer and possibly a cups-pdf virtual printer). 968284 4 cgarcia 2014-01-15 05:00:41 -0800 Adding wk2 owner because of the change in WebChromeClient 968297 5 gustavo 2014-01-15 06:05:50 -0800 (In reply to comment #3) > > > Source/WebKit2/ChangeLog:12 > > > + UI process like EndPrinting. When the EndPriting message is > > > > Readability would be improved by using longer lines and/or splitting in paragraphs, I think. > > my emacs. . . Mx- set-fill-column <RET> 92 <RET> \o/ =) > > Do I understand correctly that the printer list is kept alive by this reference, but is destroyed afterwards? I was a bit concerned when I saw PrinterListGtk::s_sharedPrinterList, since that could mean the printer list would only be obtained once, but I think I understand the idea now. > > Yes, it's tricky. The thing is that for sync printing, we need to make sure that the PrinterList object has already … Makes sense, thanks! 968362 6 cgarcia 2014-01-15 09:33:35 -0800 Committed r162073: <http://trac.webkit.org/changeset/162073> 221254 2014-01-15 02:53:16 -0800 2014-01-15 04:26:25 -0800 Patch wk2-printing-crash.diff text/plain 18100 cgarcia ZGlmZiAtLWdpdCBhL1NvdXJjZS9XZWJLaXQyL0NoYW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQyL0No YW5nZUxvZwppbmRleCBjMmFlMDgyLi5hZjNlOWZjMCAxMDA2NDQKLS0tIGEvU291cmNlL1dlYktp dDIvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9XZWJLaXQyL0NoYW5nZUxvZwpAQCAtMSwzICsxLDQ1 IEBACisyMDE0LTAxLTE1ICBDYXJsb3MgR2FyY2lhIENhbXBvcyAgPGNnYXJjaWFAaWdhbGlhLmNv bT4KKworICAgICAgICBbR1RLXSBXZWIgcHJvY2VzcyBzb21ldGltZXMgY3Jhc2hlcyB3aGVuIHBy aW50aW5nIGluIHN5bmNocm9ub3VzIG1vZGUKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5v cmcvc2hvd19idWcuY2dpP2lkPTEyNjk3OQorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAo T09QUyEpLgorCisgICAgICAgIFdoZW4gcHJpbnRpbmcgc3luY2hyb25vdXNseSBpbiBHVEsrIHdl 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