pan: assertion violated ( !(alloc_successful)||free_successful) (at depth 66) pan: wrote task5_assert.pml.trail (Spin Version 5.2.4 -- 2 December 2009) Warning: Search not completed + Partial Order Reduction Full statespace search for: never claim - (none specified) assertion violations + cycle checks - (disabled by -DSAFETY) invalid end states - (disabled by -E flag) State-vector 44 byte, depth reached 66, errors: 1 65 states, stored 11 states, matched 76 transitions (= stored+matched) 2 atomic steps hash conflicts: 0 (resolved) 2.501 memory usage (Mbyte) pan: elapsed time 0.004 seconds