r0 = fcntl$dupfd(0xffffffffffffffff, 0x0, 0xffffffffffffffff)
signalfd4(r0, 0x0, 0x0, 0x800)
openat$cgroup_root(0xffffffffffffff9c, &(0x7f0000002700)='./cgroup.net/syz0\x00', 0x200002, 0x0)