> Commit ffd603f21423 ("usb: gadget: u_serial: Add null pointer check in > gs_start_io") fixed this issue. Please try adding it into your builds. > > Regards, > Prashanth K Thanks for the quick response. Indeed, the commit ffd603f21423 ("usb: gadget: u_serial: Add null pointer check in gs_start_io") solves the problem. Sorry for not checking the newest version. I wonder whether it should also be applied to the LTS v5.15.167. The bug is still present there. Best Regards Hubert