The set_robust_list syscall sets the list of futexes which are cleaned up on thread exit, and are needed to avoid mutexes being held forever on thread exit. See for example in Musl libc mutex handling: http://git.musl-libc.org/cgit/musl/tree/src/thread/pthread_mutex_trylock.c#n22 Signed-off-by: Justin Cormack <justin.cormack@unikernel.com> Upstream-commit: 7b133e7235593f8d46832045da339395e71e8148 Component: engine