r0 = syz_open_procfs$namespace(0xffffffffffffffff, &(0x7f0000000080)='ns/pid_for_children\x00')
fsetxattr$system_posix_acl(r0, &(0x7f0000000100)='system.posix_acl_default\x00', 0x0, 0x0, 0x0)