Ubuntu
qtbase-opensource-src package

QWebEngineView crashes

Bug #1761708 reported by Dmitry
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
qtbase-opensource-src (Ubuntu)
Fix Released
High
Simon Quigley

Bug Description

I have KUbuntu 18.04 with the latest updates. I installed all pyqt3 stuff plus python3-pyqt5.qtwebengine and tried to execute a tiny webengine demo (attached):

$ python3 browser.py
Segmentation fault (core dumped)
[1:1:0100/000000.971262:ERROR:broker_posix.cc(41)] Invalid node channel message

Please see the attached core file & gdb bt

See original description
Tags: bionic
Revision history for this message
Dmitry (dmitrymq) wrote :
tags: added: bionic
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Dmitry (dmitrymq) wrote :
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Dmitry (dmitrymq) wrote :
Dmitry (dmitrymq)
description: updated
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Dmitry Shachnev (mitya57) wrote :

I can reproduce this. Attaching a more complete stacktrace.

I also tried a C++ version of the same program, it does not crash.

Changed in pyqt5 (Ubuntu):
status: New → Triaged
importance: Undecided → High
Revision history for this message
Dmitry Shachnev (mitya57) wrote :

This may be related to bug 941826, even though I can reproduce it on a headless server without NVidia graphics, using Xvfb.

I found two possible workarounds:

- Install libglvnd-dev package which will mask the real libGL.so.
- Add these three lines on top of your script: https://bugs.launchpad.net/ubuntu/+source/python-qt4/+bug/941826/comments/21.

Revision history for this message
Dmitry Shachnev (mitya57) wrote :

I think it is a bug in Qt, reported as https://bugreports.qt.io/browse/QTBUG-67537.

Another possible workaround: export QT_XCB_GL_INTEGRATION=xcb_egl (the bug is in the xcb_glx integration plugin, this environment variable will switch to a different integration plugin).

affects: pyqt5 (Ubuntu) → qtbase-opensource-src (Ubuntu)
Revision history for this message
Dmitry (dmitrymq) wrote :

Thanks for the quick response. In my situation the hack with QT_XCB_GL_INTEGRATION fixed the issue, thanks!

Simon Quigley (tsimonq2)
Changed in qtbase-opensource-src (Ubuntu):
assignee: nobody → Simon Quigley (tsimonq2)
Simon Quigley (tsimonq2)
Changed in qtbase-opensource-src (Ubuntu):
status: Triaged → Fix Committed
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package qtbase-opensource-src - 5.9.5+dfsg-0ubuntu1

---------------
qtbase-opensource-src (5.9.5+dfsg-0ubuntu1) bionic; urgency=medium

  [ Simon Quigley ]
  * New upstream release.
    - Refresh patches.
    - Update symbols from build logs.
  * Bump independent build dependencies.
  * Bump the virtual ABI package from qtbase-abi-5-9-4 to qtbase-abi-5-9-5.
  * Fix loading OpenGL library when libGL.so is missing (LP: #1761708).
    - fix-loading-OpenGL-when-symlink-missing.patch
    - QTBUG-67537

  [ Dmitry Shachnev ]
  * Update list of Qt WebKit build-dependencies in debian/README.source.

 -- Simon Quigley <email address hidden> Thu, 12 Apr 2018 18:24:40 -0500

Changed in qtbase-opensource-src (Ubuntu):
status: Fix Committed → Fix Released
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