[Webkit-unassigned] [Bug 126979] New: [GTK] Web process sometimes crashes when printing in synchronous mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126979

           Summary: [GTK] Web process sometimes crashes when printing in
                    synchronous mode
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P2
         Component: WebKit2
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: cgarcia at igalia.com


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.

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