qt for android report error about "qtmainloopthread"

[Anghd]

Hello,
I debug my app running on andriod PAD(android 8) with qtcreator(qt5.12)

W qtMainLoopThrea: type=1400 audit(0.0:6658): avc: denied { read } for name="boot_id" dev="proc" ino=113949 scontext=u:r:untrusted_app:s0:c512,c768 tcontext=u:object_r:proc:s0 tclass=file permissive=0

the the screen keep white after Qtcreator print this.