r0 = syz_open_dev$tty20(0xc, 0x4, 0x0)
r1 = dup2(r0, r0)
ioctl$PIO_UNIMAP(r1, 0x4b4b, &(0x7f0000000e00)={0x1, &(0x7f0000000dc0)=[{}]})