r0 = getpgrp(0x0)
clone3(&(0x7f0000000080)={0x31080000, 0x0, 0x0, 0x0, {}, 0x0, 0x0, 0x0, &(0x7f0000000180)=[r0], 0x1}, 0x58)
r1 = fork()
r2 = fork()
setpgid(r2, 0x0)
r3 = fork()
setpgid(r3, 0x0)
r4 = fork()
getpid()
setpgid(r4, 0x0)
setpgid(r4, r3)
ptrace(0x8, r1)