Valgrind doesn't know the ppoll() or eventfd() system calls. ppoll() was added in Linux 2.6.16 which was released on 19 Mar 2006, more than two years ago. eventfd() was added in Linux 2.6.22 which was released on 8 Aug 2007, more than half a year ago. The warning message from valgrind is: --19400-- WARNING: unhandled syscall: 284 and --19400-- WARNING: unhandled syscall: 271 That's eventfd(), resp. ppoll() on x86_64
Should be fixed in valgrind-3.3.0-3.