r0 = syz_open_dev$tty20(0xc, 0x4, 0x1)
r1 = syz_open_dev$tty20(0xc, 0x4, 0x1)
ioctl$TIOCVHANGUP(r1, 0x5437, 0x0)
writev(r0, &(0x7f00000004c0)=[{&(0x7f0000000000)="a7", 0x1}], 0x1)