[GAP Forum] Bug in HallSubgroup?

[Benjamin Sambale]

Dear GAP people,

I'm using GAP 4.7.4 on arch linux 64 bit. Let

G:=AtlasGroup("M22.2");
S:=SylowSubgroup(G,7);
N:=Normalizer(G,S);
Size(N); # =42

Then the command HallSubgroup(N,[2,3]); works *sometimes*, but other 
times I get "Error, depths are not compatible with parent pcgs". 
Apparently, this is related to the initialization of G. Try:

for i in [1..10] do
     Print(i,"\n");
     G:=AtlasGroup("M22.2");
     S:=SylowSubgroup(G,7);
     N:=Normalizer(G,S);
     HallSubgroup(N,[2,3]);
od;

Best wishes,
Benjamin