I tried and it reported one error under a second. I had to reboot because gcc started to make bash crash, it seems. Then I saw the README (duh!): Be careful

I tried and it reported one error under a second. I had to reboot because gcc started to make bash crash, it seems. Then I saw the README (duh!): Be careful not to run this test on machines that contain important data. On machines that are susceptible to the rowhammer problem, this test could cause bit flips that crash the machine, or worse, cause bit flips in data that gets written back to disc. **Warning #2:** If you find that a computer is susceptible to the rowhammer problem, you may want to avoid using it as a multi-user system. Bit flips caused by row hammering breach the CPU's memory protection. On a machine that is susceptible to the rowhammer problem, one process can corrupt pages used by other processes or by the kernel. (Mine is Kingston Hyper X 2x8GB DDR3 1600MHz)