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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>