SEGV when running csv-ip5xs.pl with a small (65536 * 10) nursery

gistfile1.txt

dogbert@dogbert-VirtualBox ~/repos/CSV $ perl6 -v
This is Rakudo version 2019.11-271-g0e2485a built on MoarVM version 2019.11-93-g7a93b28
implementing Perl 6.d.
dogbert@dogbert-VirtualBox ~/repos/CSV $ gdb ~/.rakudobrew/versions/moar-master/install/bin/perl6 core 
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
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Reading symbols from /home/dogbert/.rakudobrew/versions/moar-master/install/bin/perl6...(no debugging symbols found)...done.
[New LWP 13323]
[New LWP 13324]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `perl6 -Ilib csv-ip5xs.pl'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fdc64e77586 in MVM_serialization_demand_object (tc=0x6f8d60, sc=0x7fdc65859608, idx=85) at src/6model/serialization.c:2848
2848	    MVM_reentrantmutex_unlock(tc, (MVMReentrantMutex *)sc->body->mutex);
[Current thread is 1 (Thread 0x7fdc658e8700 (LWP 13323))]
(gdb) bt
#0  0x00007fdc64e77586 in MVM_serialization_demand_object (tc=0x6f8d60, sc=0x7fdc65859608, idx=85) at src/6model/serialization.c:2848
#1  0x00007fdc64e6b57c in MVM_sc_get_object (tc=0x6f8d60, sc=0x7fdc65859608, idx=85) at src/6model/sc.c:206
#2  0x00007fdc64d5cc37 in MVM_sc_get_sc_object (tc=0x6f8d60, cu=0x7c7c38, dep=0, idx=85) at src/6model/sc.h:33
#3  0x00007fdc64d76802 in MVM_interp_run (tc=0x6f8d60, initial_invoke=0x7fdc64f0ea8c <toplevel_initial_invoke>, invoke_data=0x7d6b68) at src/core/interp.c:3229
#4  0x00007fdc64f0ec2a in MVM_vm_run_file (instance=0x6f8260, filename=0x6f81e0 "/home/dogbert/.rakudobrew/versions/moar-master/install/share/perl6/runtime/perl6.moarvm") at src/moar.c:461
#5  0x00000000004011e2 in main ()
(gdb) l
2843	        work_loop(tc, sr);
2844	
2845	    /* Clear up. */
2846	    MVM_gc_allocate_gen2_default_clear(tc);
2847	    sr->working--;
2848	    MVM_reentrantmutex_unlock(tc, (MVMReentrantMutex *)sc->body->mutex);
2849	
2850	    /* Return the (perhaps just stubbed) object. */
2851	    return sc->body->root_objects[idx];
2852	}
(gdb) info threads
  Id   Target Id         Frame 
* 1    Thread 0x7fdc658e8700 (LWP 13323) 0x00007fdc64e77586 in MVM_serialization_demand_object (tc=0x6f8d60, sc=0x7fdc65859608, idx=85) at src/6model/serialization.c:2848
  2    Thread 0x7fdc63e73700 (LWP 13324) at_pos (tc=0x800784570, st=0x763120, root=0x7fdc64e0d69a <bind_pos+1734>, data=0x7fdc63e71220, index=7882096, value=0x2b88e08, kind=0)
    at src/6model/reprs/VMArray.c:138
(gdb) t 2
[Switching to thread 2 (Thread 0x7fdc63e73700 (LWP 13324))]
#0  at_pos (tc=0x800784570, st=0x763120, root=0x7fdc64e0d69a <bind_pos+1734>, data=0x7fdc63e71220, index=7882096, value=0x2b88e08, kind=0) at src/6model/reprs/VMArray.c:138
138	static void at_pos(MVMThreadContext *tc, MVMSTable *st, MVMObject *root, void *data, MVMint64 index, MVMRegister *value, MVMuint16 kind) {
(gdb) bt
#0  at_pos (tc=0x800784570, st=0x763120, root=0x7fdc64e0d69a <bind_pos+1734>, data=0x7fdc63e71220, index=7882096, value=0x2b88e08, kind=0) at src/6model/reprs/VMArray.c:138
#1  0x00007fdc64e0ca6e in MVM_VMArray_at_pos (tc=0x784570, st=0x763120, root=0x2b88df0, data=0x2b88e08, index=2102, value=0x7fdc63e71260, kind=8) at src/6model/reprs/VMArray.c:258
#2  0x00007fdc64e03703 in MVM_repr_at_pos_o (tc=0x784570, obj=0x2b88df0, idx=2102) at src/6model/reprconv.c:138
#3  0x00007fdc64ea9611 in MVM_spesh_stats_cleanup (tc=0x784570, check_frames=0x2b88df0) at src/spesh/stats.c:661
#4  0x00007fdc64ea63af in worker (tc=0x784570, callsite=0x7fdc656dfc00 <null_args_callsite>, args=0x0) at src/spesh/worker.c:20
#5  0x00007fdc64e14799 in invoke_handler (tc=0x784570, invokee=0x777a00, callsite=0x7fdc656dfc00 <null_args_callsite>, args=0x0) at src/6model/reprs/MVMCFunction.c:9
#6  0x00007fdc64da76a8 in thread_initial_invoke (tc=0x784570, data=0x7c5cd0) at src/core/threads.c:59
#7  0x00007fdc64d5da24 in MVM_interp_run (tc=0x784570, initial_invoke=0x7fdc64da761d <thread_initial_invoke>, invoke_data=0x7c5cd0) at src/core/interp.c:162
#8  0x00007fdc64da7766 in start_thread (data=0x7c5cd0) at src/core/threads.c:87
#9  0x00007fdc642876ba in start_thread (arg=0x7fdc63e73700) at pthread_create.c:333
#10 0x00007fdc648ad41d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
(gdb) l
133	/* Gets the storage specification for this representation. */
134	static const MVMStorageSpec * get_storage_spec(MVMThreadContext *tc, MVMSTable *st) {
135	    return &storage_spec;
136	}
137	
138	static void at_pos(MVMThreadContext *tc, MVMSTable *st, MVMObject *root, void *data, MVMint64 index, MVMRegister *value, MVMuint16 kind) {
139	    MVMArrayREPRData *repr_data = (MVMArrayREPRData *)st->REPR_data;
140	    MVMArrayBody     *body      = (MVMArrayBody *)data;
141	    MVMuint64        real_index;
142	
(gdb)