[PyQt] QWebEnginePage.print() raises SIGSEGV

Mon Apr 8 17:31:45 BST 2019

Hi Phil.

Please check the following:

-----8<-----

from PyQt5 import QtWidgets, QtWebEngineWidgets, QtPrintSupport

def cleanup():
    pass

def print_page():
    dialog = QtPrintSupport.QPrintDialog(w)
    if dialog.exec_() == QtPrintSupport.QPrintDialog.Accepted:
        page.print(dialog.printer(), cleanup)

app = QtWidgets.QApplication([])

html = "<html><body>Hello world</body></html>"
page = QtWebEngineWidgets.QWebEnginePage()
page.setHtml(html)

w = QtWidgets.QPushButton("Print")
w.clicked.connect(print_page)
w.show()

app.exec_()

-----8<-----

It results in the following, both in PyQt 5.12.1 from wheel and 5.10.1
from Ubuntu repos:

Received signal 11 SEGV_MAPERR 000000000040
#0 0x7f191d6db8bf <unknown>
#1 0x7f191d6dbcbb <unknown>
#2 0x7f191d6dc33e <unknown>
#3 0x7f192b1e6f20 <unknown>
#4 0x7f191aad9ba3 QPrinter::pageRect()
#5 0x7f19228694ad printPdfDataOnPrinter()
#6 0x7f1922869946 QWebEnginePagePrivate::didPrintPage()
#7 0x7f191bc0bf09 <unknown>
#8 0x7f191d63e247 <unknown>
#9 0x7f191d664b67 <unknown>
#10 0x7f191d6651cd <unknown>
#11 0x7f191d66549a <unknown>
#12 0x7f191bb9deaf <unknown>
#13 0x7f192819489b QObject::event()
#14 0x7f192900f6fc QApplicationPrivate::notify_helper()
#15 0x7f19290167f0 QApplication::notify()
#16 0x7f1929a69f5e sipQApplication::notify()
#17 0x7f1928167e98 QCoreApplication::notifyInternal2()
#18 0x7f192816a937 QCoreApplicationPrivate::sendPostedEvents()
#19 0x7f19281bfc93 postEventSourceDispatch()
#20 0x7f1924fc8387 g_main_context_dispatch
#21 0x7f1924fc85c0 <unknown>
#22 0x7f1924fc864c g_main_context_iteration
#23 0x7f19281bf2cf QEventDispatcherGlib::processEvents()
#24 0x7f19281667fa QEventLoop::exec()
#25 0x7f192816f270 QCoreApplication::exec()
#26 0x7f19298f5480 meth_QApplication_exec_
#27 0x000000502d6f <unknown>
#28 0x000000506859 _PyEval_EvalFrameDefault
#29 0x000000504c28 <unknown>
#30 0x000000506393 PyEval_EvalCode
#31 0x000000634d52 <unknown>
#32 0x000000634e0a PyRun_FileExFlags
#33 0x0000006385c8 PyRun_SimpleFileExFlags
#34 0x00000063915a Py_Main
#35 0x0000004a6f10 main
#36 0x7f192b1c9b97 __libc_start_main
#37 0x0000005afa0a _start
  r8: 3c0a6a626f203020  r9: 6f74616572432f3c r10: 6d6f726843282072 r11:
72502f0a296d7569
 r12: 00000000023f3d80 r13: 00007ffcd6fb5110 r14: 00007f1922869920 r15:
00007f19226f2e70
  di: 00000000023f3d80  si: 00000000023f3d80  bp: 00007ffcd6fb5140  bx:
00007ffcd6fb4f90
  dx: 0000000000000009  ax: 0000000000000030  cx: 282072656375646f  sp:
00007ffcd6fb4f80
  ip: 00007f191aad9ba3 efl: 0000000000010202 cgf: 002b000000000033 erf:
0000000000000004
 trp: 000000000000000e msk: 0000000000000000 cr2: 0000000000000040
[end of stack trace]
Calling _exit(1). Core file will not be generated.

Greetings.

Julio.

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