Starting with polynomial:
P : t^4 - 6*t^2 + 3
Extension levels are: 4 5
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Trying to find an order 5 Kronrod extension for:
P1 : t^4 - 6*t^2 + 3
Solvable: 1
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Ending with final polynomial:
P : t^9 - 21*t^7 + 108*t^5 - 135*t^3 + 45*t
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Computing nodes and weights
  current precision for roots: 53
  current precision for roots: 106
 current precision for weights: 53
Linear system for weights solvable: 1
  current precision for roots: 106
  current precision for roots: 212
 current precision for weights: 106
Linear system for weights solvable: 1
Sufficient bits for target precision reached
Positive weights:   7 out of 9
Indefinite weights: 0 out of 9
Negative weights:   2 out of 9
Extension rule has valid weights: 0
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*** EXTENSION WITH INVALID WEIGHTS ***
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