Running grpmat.tst twice (main/background threads)

[olexandr-konovalov]

The following example is the first where grpmat.tst trips over:

1. In the main thread, call

gap> g:=Group( ( 9,11,10), ( 2, 3, 4),  (14,17,15), (13,16)(15,17), 
   >        ( 8,12)(10,11), ( 5, 7)(10,11), (15,16,17), (10,11,12) );;
Sum(ConjugacyClasses(g),Size)=Size(g);
gap> true

1. Switch to another thread and call the same:

[5] gap> g:=Group( ( 9,11,10), ( 2, 3, 4),  (14,17,15), (13,16)(15,17), 
          ( 8,12)(1[5] 0> ,11), ( 5, 7)(10,11), (15,16,17), (10,11,12) );;
Sum(ConjugacyClasses(g),Size)=Size(g);
[5] gap> [5] Error, Attempt to read object 4342401168 of type object (data) without having read access in
[5]   iso := GroupHomomorphismByImagesNC( G, A, pcgs, GeneratorsOfGroup( A ) )
[5]  ; on line 30 of file /Users/alexk/GITREPS/hpcgap-fork/lib/permdeco.gi called from 
[5] FittingFreeLiftSetup( G 
[5]  ) on line 2227 of file /Users/alexk/GITREPS/hpcgap-fork/lib/clashom.gi called from
[5] ConjugacyClassesViaRadical( G 
[5]  ) on line 2940 of file /Users/alexk/GITREPS/hpcgap-fork/lib/clashom.gi called from
[5] <function "unknown">( <arguments> )
[5]  called from read-eval loop at line 3 of stream
[5] brk> !0 

1. Check inaccessible object in the main thread:

--- Switching to thread 0
gap> OBJ_HANDLE(4342401168);
f1

Seems related to the discussion in #74 on associative words in syllable format...

[fingolfin]

As far as I can tell, this was resolved -- at least I cannot reproduce this on master anymore.