On systems without Xrender or where Xrender have been disable, an application that paints on a QBitmap using a custom QBrush results in incorrect drawing/application termination, and the X error code:

X Error: BadMatch (invalid parameter attributes) 8
Major opcode: 62 (X_CopyArea)
Resource id: 0x5000003

The problem can be reproduce with the attached example, like this: QT_X11_NO_XRENDER=1 ./app