r0 = fork()
ptrace(0x10, r0)
r1 = getpgid(r0)
wait4(r1, &(0x7f0000000080), 0x80000000, 0x0)
r2 = fork()
ptrace(0x10, r2)
wait4(r2, &(0x7f0000000080), 0x80000000, 0x0)
syz_open_dev$loop(&(0x7f0000000100), 0x0, 0x0)
ptrace(0x4208, r2)