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WBrowser: broker_posix.cc(41) Invalid node channel message (SOLVED)
WBrowser sometimes crashes in Qt on Linux with segfault below:
broker_posix.cc(41) Invalid node channel message
This is known Qt bug (ref: https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1761708). The workaround is:
export QT_XCB_GL_INTEGRATION=xcb_egl
From this Qt bug report it looks like you can also just install the libglvnd-dev package on your system. I did this and can verify it fixes the issue on my Ubuntu 18.04 system when running with PyQt5.