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That test causes a large amount of crashes. If a system has a /proc/sys/kernel/core_pattern that uploads core dumps enabled, it will take a long time to complete. Set dumpable to 0 to avoid that. Before: $ time ./panic-uninitialized-zeroed real 0m47.457s user 0m0.023s sys 0m0.021s After: $ ./panic-uninitialized-zeroed real 0m0.029s user 0m0.019s sys 0m0.010s