[Python-modules-team] Bug#910317: QtWebEngine in unstable is constantly crashing

[Boyuan Yang]

Package: python3-pyqt5.qtwebengine
Version: 5.11.2+dfsg-1
Severity: serious
X-Debbugs-CC: debian-qt-kde at lists.debian.org
Control: affects -1 + libqt5webengine5

Dear Debian Qt/KDE maintainers and pyqt5.qtwebengine maintainers,

Current QtWebEngine in Debian Unstable would easily crash. That
happens after recent upgrade of libkf5.

For example, run the following script under python3:

$ export LC_ALL=C.UTF-8
$ export LANG=C
$ cat ./test.py
import sys

from PyQt5.QtWidgets import QApplication
from PyQt5.QtWidgets import QMainWindow
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtCore import QUrl

def main():
    app = QApplication(sys.argv)
    window = QMainWindow()
    window.setWindowTitle('PyQt Demo')
    window.setGeometry(320, 180, 960, 540)
    view = QWebEngineView()
    view.load(QUrl('http://leafletjs.com/')) # error here
    window.setCentralWidget(view)
    window.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()
$ python3 ./test.py
[1004/140404.438632:WARNING:stack_trace_posix.cc(699)] Failed to open
file: /tmp/.glBfSxZo (deleted)
  Error: No such file or directory
[8494:8515:1004/140404.647050:ERROR:nss_util.cc(727)] After loading
Root Certs, loaded==false: NSS error code: -8018
Received signal 11 SEGV_MAPERR 000000000010
#0 0x7fc98c03e76e <unknown>
#1 0x7fc98c03e880 <unknown>
#2 0x7fc98c03eeb7 <unknown>
#3 0x7fc9969db8e0 <unknown>
#4 0x7fc990771604 <unknown>
#5 0x7fc98aa8d660 <unknown>
#6 0x7fc98aabde3c <unknown>
#7 0x7fc98a0af500 QQuickWindowPrivate::updateDirtyNode()
#8 0x7fc98a0af963 QQuickWindowPrivate::updateDirtyNodes()
#9 0x7fc98a0b0e22 QQuickWindowPrivate::syncSceneGraph()
#10 0x7fc98a16ce49 QQuickRenderControl::sync()
#11 0x7fc989c7e0c6 <unknown>
#12 0x7fc989c7e2a6 <unknown>
#13 0x7fc994b0003b QObject::event()
#14 0x7fc99548ac6b QWidget::event()
#15 0x7fc989c81e2d QQuickWidget::event()
#16 0x7fc990771bf0 <unknown>
#17 0x7fc99544c4a1 QApplicationPrivate::notify_helper()
#18 0x7fc995453ae0 QApplication::notify()
#19 0x7fc995d1f11e <unknown>
#20 0x7fc994ad6589 QCoreApplication::notifyInternal2()
#21 0x7fc994b27648 QTimerInfoList::activateTimers()
#22 0x7fc994b27ea4 <unknown>
#23 0x7fc9939acc3e g_main_context_dispatch
#24 0x7fc9939aced8 <unknown>
#25 0x7fc9939acf6c g_main_context_iteration
#26 0x7fc994b28233 QEventDispatcherGlib::processEvents()
#27 0x7fc97df51ee1 <unknown>
#28 0x7fc994ad525b QEventLoop::exec()
#29 0x7fc994add3d2 QCoreApplication::exec()
#30 0x7fc995ce214b <unknown>
#31 0x0000005068bf <unknown>
#32 0x00000050a4e9 _PyEval_EvalFrameDefault
#33 0x000000505d58 <unknown>
#34 0x000000506a8d <unknown>
#35 0x00000050a4e9 _PyEval_EvalFrameDefault
#36 0x0000005088b8 <unknown>
#37 0x00000050a023 PyEval_EvalCode
#38 0x000000635f82 <unknown>
#39 0x00000063603a PyRun_FileExFlags
#40 0x0000006397f8 PyRun_SimpleFileExFlags
#41 0x00000063a38a Py_Main
#42 0x0000004ac090 main
#43 0x7fc996433b17 __libc_start_main
#44 0x0000005b35aa _start
  r8: 0000000017281b04  r9: 00000000017ae3e0 r10: 0000000017281b04
r11: 0000000000000001
 r12: 0000000000000000 r13: 00000000017651c0 r14: 00007fc994b91660
r15: 00000000017650e0
  di: 0000000001728da0  si: 0000000000000000  bp: 00007ffc01652bc0
bx: 0000000001713dd0
  dx: 00007fc994b91660  ax: 0000000001082000  cx: 00007fc994b91678
sp: 00007ffc016527e0
  ip: 00007fc990771604 efl: 0000000000010202 cgf: 002b000000000033
erf: 0000000000000004
 trp: 000000000000000e msk: 0000000000000000 cr2: 0000000000000010
[end of stack trace]
Calling _exit(1). Core file will not be generated.
$

--
Thanks,
Boyuan Yang