Comment 7 for bug 1406146

Ciao Francesco,
Thanks a lot for the logs.
So there an error in GF13, a NaN which triggers some segfault (that can be related to the filling of the integration grids)

 alpha_s value used for the virtuals is (for the first PS point): 0.14798557992250208
 ---- POLES CANCELLED ----
 ERROR, NaN found for dsigS, setting dsigS to 0 for this event
 ERROR, NaN found for dsigS, setting dsigS to 0 for this event
ABS integral = Infinity +/- NaN ( NaN %)
Integral = -Infinity +/- NaN ( NaN %)
Virtual = -Infinity +/- NaN ( NaN %)
Virtual ratio = NaN +/- NaN ( NaN %)
ABS virtual = Infinity +/- NaN ( NaN %)
Born*ao2pi = 0.1604E-03 +/- 0.2395E-04 ( 14.932 %)
Chi^2 per d.o.f. 0.0000E+00
accumulated results ABS integral = Infinity +/- NaN ( NaN %)
accumulated results Integral = -Infinity +/- NaN ( NaN %)
accumulated results Virtual = -Infinity +/- NaN ( NaN %)
accumulated results Virtual ratio = NaN +/- NaN ( NaN %)
accumulated results ABS virtual = Infinity +/- NaN ( NaN %)
accumulated results Born*ao2pi = 0.1604E-03 +/- 0.2395E-04 ( 14.932 %)
accumulated result Chi^2 per DoF = 0.0000E+00
update virtual fraction to: 1.000 -Inf
  1: 0 1 2 3

Program received signal SIGSEGV: Segmentation fault - invalid memory reference.

Backtrace for this error:
#0 0x7FB21B8D02F7
#1 0x7FB21B8D08FE
#2 0x7FB21A02769F
#3 0x48A427
#4 0x48BAC1
#5 0x49422A
#6 0x497A41
#7 0x7FB21A013D5C
#8 0x4095A8
Time in seconds: 237

This NaN issue should have been already fixed for the next release (2.2.3).

Can I ask you to try this release and see if the problem is still there?

You can get the 2.2.3 branch via bzr
bzr branch lp:~maddevelopers/mg5amcnlo/2.2.3

Let me know,
Cheers

Marco