gen_segfault_matrix.py

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#!/usr/bin/env python3
import sys
 
rows = 64
cols = 65
nz = rows + rows # identity + last col
 
print("%%MatrixMarket matrix coordinate integer general")
print(f"{rows} {cols} {nz}")
 
# Identity matrix (pivots)
for i in range(1, rows + 1):
    print(f"{i} {i} 1")
 
# Last column (non-pivot, all 1s)
for i in range(1, rows + 1):
    print(f"{i} {cols} 1")