r0 = syz_open_dev$tty20(0xc, 0x4, 0x1)
newfstatat(0xffffffffffffff9c, 0x0, &(0x7f0000002640)={0x0, 0x0, 0x0, 0x0, <r1=>0x0}, 0x1000)
setuid(r1)
ioctl$GIO_UNIMAP(r0, 0x4b36, 0x0)