r0 = syz_open_dev$tty20(0xc, 0x4, 0x1)
r1 = gettid()
r2 = getpgrp(0x0)
r3 = syz_open_dev$tty20(0xc, 0x4, 0x1)
kcmp(r1, r2, 0x0, r0, r3)