syz_open_dev$sg(0x0, 0x0, 0x0)
fcntl$dupfd(0xffffffffffffffff, 0x0, 0xffffffffffffffff)
r0 = syz_open_dev$tty20(0xc, 0x4, 0x1)
ioctl$VT_DISALLOCATE(r0, 0x5608)