(gdb) bt
#0  0x00007f05a4fdcc87 in MVM_gc_mark_collectable (tc=0x10657e0, worklist=0x3e17770, new_addr=0x38c7be0) at src/gc/collect.c:339
#1  0x00007f05a4fdc397 in MVM_gc_root_add_gen2s_to_worklist (tc=tc@entry=0x10657e0, worklist=worklist@entry=0x3e17770) at src/gc/roots.c:294
#2  0x00007f05a4fddcd5 in MVM_gc_collect (tc=0x10657e0, what_to_do=<optimized out>, gen=gen@entry=0 '\000') at src/gc/collect.c:127
#3  0x00007f05a4fd9a55 in run_gc (tc=tc@entry=0x10657e0, what_to_do=what_to_do@entry=0 '\000') at src/gc/orchestrate.c:357
#4  0x00007f05a4fda509 in MVM_gc_enter_from_allocator (tc=tc@entry=0x10657e0) at src/gc/orchestrate.c:470
#5  0x00007f05a4fc8a2d in try_join (thread=<optimized out>, tc=0x10657e0) at src/core/threads.c:167
#6  MVM_thread_join (tc=0x10657e0, thread_obj=<optimized out>) at src/core/threads.c:173
#7  0x00007f05a4faa743 in MVM_interp_run (tc=tc@entry=0x10657e0, initial_invoke=0x3ec5c10, invoke_data=0x10849a0) at src/core/interp.c:3685
#8  0x00007f05a50729a1 in MVM_vm_run_file (instance=0x1065010, filename=0x7fff802c87d3 "/home/cono/work/rakudo/install/share/perl6/runtime/perl6.moarvm") at src/moar.c:323
#9  0x0000000000401172 in main (argc=8, argv=0x7fff802c7428) at src/main.c:246