...LKW, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) = 0 futex(0x8063c48, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x8063c44, {FUTEX_OP_SET, 0, FUTEX_OP_CMP_GT, 1}) = 1 epoll_wait(1, {{EPOLLIN, {u32=0, u64=0}}}, 32, 19940) = 1 clock_gettime(CLOCK_MONOTONIC, {223660, 369822960}) = 0 epoll_ctl(1, EPOLL_CTL_DEL, ...