21742 clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f4143c25770) = -1 EAGAIN (Resource temporarily unavailable)
21742 rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
21742 rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
21742 rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
21742 nanosleep({5, 0},  <unfinished ...>