zero diagonal found in Jacobian

Hi

 I have a general question about the warning "Zero diagonal found in Jacobian"

I use spectre(7.2) to simulate some designs and I get sometimes this warning  "Zero diagonal found in Jacobian"  (as in the example below), even if the simulation converges and the results seems correct.

what's the effect of a " Zero diagonal found in Jacobian" on the simulation results ?

Is it possible that Jacobian reordering lead to convergence problem or error/innacuracy in the results ?

 Thanks for your help,

Best Regards !

**************************************************
Stability Analysis `stb': freq = (1 mHz -> 20 GHz)
**************************************************
Zero diagonal found in Jacobian at `I4.M0:int_s' and `I4.M0:int_s'.
Reordering Jacobian.
Zero diagonal found in Jacobian at `I4.I89.M13:int_s' and `I4.I89.M13:int_s'.
Reordering Jacobian.
Trying `homotopy = gmin'.

Maximum value achieved for any signal of each quantity:
V: V(net176) = 3.3 V
I: I(V13:p) = 4.268 mA
    stb: freq = 2.154 mHz   (2.51 %), step = 159.2 uHz    (251 m%)
    stb: freq = 10 mHz      (7.52 %), step = 738.8 uHz    (251 m%)
    stb: freq = 46.42 mHz   (12.5 %), step = 3.429 mHz    (251 m%)
    stb: freq = 215.4 mHz   (17.5 %), step = 15.92 mHz    (251 m%)
    stb: freq = 1 Hz        (22.6 %), step = 73.88 mHz    (251 m%)
    stb: freq = 4.642 Hz    (27.6 %), step = 342.9 mHz    (251 m%)
    stb: freq = 21.54 Hz    (32.6 %), step = 1.592 Hz     (251 m%)
    stb: freq = 100 Hz      (37.6 %), step = 7.388 Hz     (251 m%)
    stb: freq = 464.2 Hz    (42.6 %), step = 34.29 Hz     (251 m%)
    stb: freq = 2.154 kHz   (47.6 %), step = 159.2 Hz     (251 m%)
    stb: freq = 10 kHz      (52.6 %), step = 738.8 Hz     (251 m%)
    stb: freq = 46.42 kHz   (57.6 %), step = 3.429 kHz    (251 m%)
    stb: freq = 215.4 kHz   (62.7 %), step = 15.92 kHz    (251 m%)
    stb: freq = 1 MHz       (67.7 %), step = 73.88 kHz    (251 m%)
    stb: freq = 4.642 MHz   (72.7 %), step = 342.9 kHz    (251 m%)
    stb: freq = 21.54 MHz   (77.7 %), step = 1.592 MHz    (251 m%)
    stb: freq = 100 MHz     (82.7 %), step = 7.388 MHz    (251 m%)
    stb: freq = 464.2 MHz   (87.7 %), step = 34.29 MHz    (251 m%)
    stb: freq = 2.154 GHz   (92.7 %), step = 159.2 MHz    (251 m%)
    stb: freq = 10 GHz      (97.7 %), step = 738.8 MHz    (251 m%)
Gain margin = 40.6864 dB at frequency = 642.509 MHz.
Phase margin = 86.7804 Deg at frequency = 12.8495 MHz.