I tried rebuilding my lxqt packages. I tried switching qt5-base to qt5-base-git, and it didn't make any difference.
Is anyone else seeing segfaults in recent Qt5 packages?
Thread 1 "lxqt-panel" received signal SIGSEGV, Segmentation fault.
0x00007ffff691398a in QtSharedPointer::ExternalRefCountData::getAndRef(QObject const*) () from /usr/lib/libQt5Core.so.5
I guess I had a bad configuration file, probably due to changing my monitor setup.
I was able to fix it just be deleting the lxqt-panel config file.